Develop Reference

EditText Social Security Number

I am developing one application in android for California. now i want to enter Social Security Number in Edit Text in xxx-xx-xxxx format. i have tried following code for achieve the functionality but it is not working fine for clearing the text.. following is my code. any help would be appreciated. i want auto format functionality.
etSocialSecurityNumber.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String text = etSocialSecurityNumber.getText().toString();
textlength = etSocialSecurityNumber.getText().length();
if(text.endsWith(" "))
return;
if(textlength == 4 || textlength == 7 )
{
etSocialSecurityNumber.setText(new StringBuilder(text).insert(text.length()-1, "-").toString());
etSocialSecurityNumber.setSelection(etSocialSecurityNumber.getText().length());
}
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void afterTextChanged(Editable s) {
}
});

This will add a - after every 4 characters and it handels all kind of editing of user, just put your condition for 3 and 2 chars:
edit_text.addTextChangedListener(new TextWatcher() {
private boolean spaceDeleted;
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
CharSequence charDeleted = s.subSequence(start, start + count);
spaceDeleted = " ".equals(charDeleted.toString());
}
public void afterTextChanged(Editable editable) {
edit_text.removeTextChangedListener(this);
int cursorPosition = edit_text.getSelectionStart();
String withSpaces = formatText(editable);
edit_text.setText(withSpaces);
edit_text.setSelection(cursorPosition + (withSpaces.length() - editable.length()));
if (spaceDeleted) {
edit_text.setSelection(edit_text.getSelectionStart() - 1);
spaceDeleted = false;
}
edit_text.addTextChangedListener(this);
}
private String formatText(CharSequence text)
{
StringBuilder formatted = new StringBuilder();
int count = 0;
for (int i = 0; i < text.length(); ++i)
{
if (Character.isDigit(text.charAt(i)))
{
if (count % 4 == 0 && count > 0)
formatted.append("-");
formatted.append(text.charAt(i));
++count;
}
}
return formatted.toString();
}
});
Edited:
userNameET.addTextChangedListener(new TextWatcher() {
private boolean spaceDeleted;
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
CharSequence charDeleted = s.subSequence(start, start + count);
spaceDeleted = "-".equals(charDeleted.toString());
}
public void afterTextChanged(Editable editable) {
userNameET.removeTextChangedListener(this);
int cursorPosition = userNameET.getSelectionStart();
String withSpaces = formatText(editable);
userNameET.setText(withSpaces);
userNameET.setSelection(cursorPosition + (withSpaces.length() - editable.length()));
if (spaceDeleted) {
// userNameET.setSelection(userNameET.getSelectionStart() - 1);
spaceDeleted = false;
}
userNameET.addTextChangedListener(this);
}
private String formatText(CharSequence text)
{
StringBuilder formatted = new StringBuilder();
int count = 0;
if(text.length()==3||text.length()==6)
{
if (!spaceDeleted)
formatted.append(text+"-");
else
formatted.append(text);
}
else
formatted.append(text);
return formatted.toString();
}
});

The following Kotlin code sufficed my requirements
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
backspaced = count == 0
}
override fun afterTextChanged(s: Editable?) {
s?.apply {
if (!isEmpty()) {
if (get(lastIndex) != '-' && (length > 1 && get(lastIndex - 1) != '-') && !backspaced)
count { x -> x.isDigit() }.let { mapOf(3 to 3, 4 to 3, 5 to 6, 6 to 6)[it]?.let { index -> insert(index, "-") } }
else if ((get(lastIndex) == '-' && backspaced) || (lastIndexOf('-') in listOf(0,1,2,4,5,7,8,9,10)) )
delete(length - 1, length)
}
}
}

I know its too late to post an answer here. I just want to share the code which I used to format SSN. Try the following code.
public class SSNFormatter implements TextWatcher{
private boolean mFormatting;
private boolean clearFlag;
private int mLastStart;
private String mBeforeText;
private boolean spaceDeleted;
WeakReference<EditText> mWeakEditText;
public SSNFormatter(WeakReference<EditText> weakEditText) {
this.mWeakEditText = weakEditText;
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
mLastStart = start;
mBeforeText = s.toString();
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
if (s.length()>0 && mWeakEditText.get().getText().hashCode() == s.hashCode() && mWeakEditText.get().getError() != null)
mWeakEditText.get().setError(null);
if (!mFormatting) {
mFormatting = true;
int curPos = mLastStart;
String beforeValue = mBeforeText;
String currentValue = s.toString();
String formattedValue = formatSSN(s);
if (currentValue.length() > beforeValue.length()) {
int setCusorPos = formattedValue.length()
- (beforeValue.length() - curPos);
mWeakEditText.get().setSelection(
setCusorPos < 0 ? 0 : setCusorPos);
} else {
int setCusorPos = formattedValue.length()
- (currentValue.length() - curPos);
if (setCusorPos > 0
&& !Character.isDigit(formattedValue
.charAt(setCusorPos - 1))) {
setCusorPos--;
}
mWeakEditText.get().setSelection(
setCusorPos < 0 ? 0 : setCusorPos);
}
mFormatting = false;
}
}
private String formatSSN(Editable text){
StringBuilder formattedString = new StringBuilder();
// Remove everything except digits
int p = 0;
while (p < text.length()) {
char ch = text.charAt(p);
if (!Character.isDigit(ch)) {
text.delete(p, p + 1);
} else {
p++;
}
}
// Now only digits are remaining
String allDigitString = text.toString();
int totalDigitCount = allDigitString.length();
if (totalDigitCount == 0 || totalDigitCount > 10) {
// May be the total length of input length is greater than the
// expected value so we'll remove all formatting
text.clear();
text.append(allDigitString);
return allDigitString;
}
int alreadyPlacedDigitCount = 0;
// Only '1' is remaining and user pressed backspace and so we clear
// the edit text.
if (allDigitString.equals("1") && clearFlag) {
text.clear();
clearFlag = false;
return "";
}
boolean chang3 = true;
boolean chang2 = false;
// There must be a '-' inserted after the next 3 numbers
if (chang3 && totalDigitCount - alreadyPlacedDigitCount > 3) {
formattedString
.append(allDigitString.substring(alreadyPlacedDigitCount,
alreadyPlacedDigitCount + 3) + "-");
alreadyPlacedDigitCount += 3;
chang3 = false;
chang2 = true;
}
// There must be a '-' inserted after the next 2 numbers
if (chang2 && totalDigitCount - alreadyPlacedDigitCount > 2) {
formattedString
.append(allDigitString.substring(alreadyPlacedDigitCount,
alreadyPlacedDigitCount + 2) + "-");
alreadyPlacedDigitCount += 2;
chang3 = true;
chang2 = false;
}
// All the required formatting is done so we'll just copy the
// remaining digits.
if (totalDigitCount > alreadyPlacedDigitCount) {
formattedString.append(allDigitString
.substring(alreadyPlacedDigitCount));
}
text.clear();
text.append(formattedString.toString());
return formattedString.toString();
}
}

Phone number formatting an EditText in Android

I am making a simple Address Book app (targeting 4.2) that takes name, address, city, state, zip and phone.
I want to format the phone number input as a phone number (XXX) XXX-XXXX, but I need to pull the value out as a string so I can store it in my database when I save. How can i do this??
I have the EditText set for "phone number" input but that obviously doesn't do too much.

Simply use the PhoneNumberFormattingTextWatcher, just call:
editText.addTextChangedListener(new PhoneNumberFormattingTextWatcher());
Addition
To be clear, PhoneNumberFormattingTextWatcher's backbone is the PhoneNumberUtils class. The difference is the TextWatcher maintains the EditText while you must call PhoneNumberUtils.formatNumber() every time you change its contents.

There is a library called PhoneNumberUtils that can help you to cope with phone number conversions and comparisons. For instance, use ...
EditText text = (EditText) findViewById(R.id.editTextId);
PhoneNumberUtils.formatNumber(text.getText().toString())
... to format your number in a standard format.
PhoneNumberUtils.compare(String a, String b);
... helps with fuzzy comparisons. There are lots more. Check out http://developer.android.com/reference/android/telephony/PhoneNumberUtils.html for more.
p.s. setting the the EditText to phone is already a good choice; eventually it might be helpful to add digits e.g. in your layout it looks as ...
<EditText
android:id="#+id/editTextId"
android:inputType="phone"
android:digits="0123456789+"
/>

Simply Use This :
In Java Code :
editText.addTextChangedListener(new PhoneNumberFormattingTextWatcher());
In XML Code :
<EditText
android:id="#+id/etPhoneNumber"
android:inputType="phone"/>
This code work for me. It'll auto format when text changed in edit text.

I've recently done a similar formatting like 1 (XXX) XXX-XXXX for Android EditText. Please find the code below. Just use the TextWatcher sub-class as the text changed listener :
....
UsPhoneNumberFormatter addLineNumberFormatter = new UsPhoneNumberFormatter(
new WeakReference<EditText>(mYourEditText));
mYourEditText.addTextChangedListener(addLineNumberFormatter);
...
private class UsPhoneNumberFormatter implements TextWatcher {
//This TextWatcher sub-class formats entered numbers as 1 (123) 456-7890
private boolean mFormatting; // this is a flag which prevents the
// stack(onTextChanged)
private boolean clearFlag;
private int mLastStartLocation;
private String mLastBeforeText;
private WeakReference<EditText> mWeakEditText;
public UsPhoneNumberFormatter(WeakReference<EditText> weakEditText) {
this.mWeakEditText = weakEditText;
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
if (after == 0 && s.toString().equals("1 ")) {
clearFlag = true;
}
mLastStartLocation = start;
mLastBeforeText = s.toString();
}
#Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
// TODO: Do nothing
}
#Override
public void afterTextChanged(Editable s) {
// Make sure to ignore calls to afterTextChanged caused by the work
// done below
if (!mFormatting) {
mFormatting = true;
int curPos = mLastStartLocation;
String beforeValue = mLastBeforeText;
String currentValue = s.toString();
String formattedValue = formatUsNumber(s);
if (currentValue.length() > beforeValue.length()) {
int setCusorPos = formattedValue.length()
- (beforeValue.length() - curPos);
mWeakEditText.get().setSelection(setCusorPos < 0 ? 0 : setCusorPos);
} else {
int setCusorPos = formattedValue.length()
- (currentValue.length() - curPos);
if(setCusorPos > 0 && !Character.isDigit(formattedValue.charAt(setCusorPos -1))){
setCusorPos--;
}
mWeakEditText.get().setSelection(setCusorPos < 0 ? 0 : setCusorPos);
}
mFormatting = false;
}
}
private String formatUsNumber(Editable text) {
StringBuilder formattedString = new StringBuilder();
// Remove everything except digits
int p = 0;
while (p < text.length()) {
char ch = text.charAt(p);
if (!Character.isDigit(ch)) {
text.delete(p, p + 1);
} else {
p++;
}
}
// Now only digits are remaining
String allDigitString = text.toString();
int totalDigitCount = allDigitString.length();
if (totalDigitCount == 0
|| (totalDigitCount > 10 && !allDigitString.startsWith("1"))
|| totalDigitCount > 11) {
// May be the total length of input length is greater than the
// expected value so we'll remove all formatting
text.clear();
text.append(allDigitString);
return allDigitString;
}
int alreadyPlacedDigitCount = 0;
// Only '1' is remaining and user pressed backspace and so we clear
// the edit text.
if (allDigitString.equals("1") && clearFlag) {
text.clear();
clearFlag = false;
return "";
}
if (allDigitString.startsWith("1")) {
formattedString.append("1 ");
alreadyPlacedDigitCount++;
}
// The first 3 numbers beyond '1' must be enclosed in brackets "()"
if (totalDigitCount - alreadyPlacedDigitCount > 3) {
formattedString.append("("
+ allDigitString.substring(alreadyPlacedDigitCount,
alreadyPlacedDigitCount + 3) + ") ");
alreadyPlacedDigitCount += 3;
}
// There must be a '-' inserted after the next 3 numbers
if (totalDigitCount - alreadyPlacedDigitCount > 3) {
formattedString.append(allDigitString.substring(
alreadyPlacedDigitCount, alreadyPlacedDigitCount + 3)
+ "-");
alreadyPlacedDigitCount += 3;
}
// All the required formatting is done so we'll just copy the
// remaining digits.
if (totalDigitCount > alreadyPlacedDigitCount) {
formattedString.append(allDigitString
.substring(alreadyPlacedDigitCount));
}
text.clear();
text.append(formattedString.toString());
return formattedString.toString();
}
}

Maybe below sample project helps you;
https://github.com/reinaldoarrosi/MaskedEditText
That project contains a view class call MaskedEditText. As first, you should add it in your project.
Then you add below xml part in res/values/attrs.xml file of project;
<resources>
<declare-styleable name="MaskedEditText">
<attr name="mask" format="string" />
<attr name="placeholder" format="string" />
</declare-styleable>
</resources>
Then you will be ready to use MaskedEditText view.
As last, you should add MaskedEditText in your xml file what you want like below;
<packagename.currentfolder.MaskedEditText
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/maskedEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:text="5"
app:mask="(999) 999-9999"
app:placeholder="_" >
Of course that, you can use it programmatically.
After those steps, adding MaskedEditText will appear like below;
As programmatically, if you want to take it's text value as unmasked, you may use below row;
maskedEditText.getText(true);
To take masked value, you may send false value instead of true value in the getText method.

You need to create a class:
public class PhoneTextFormatter implements TextWatcher {
private final String TAG = this.getClass().getSimpleName();
private EditText mEditText;
private String mPattern;
public PhoneTextFormatter(EditText editText, String pattern) {
mEditText = editText;
mPattern = pattern;
//set max length of string
int maxLength = pattern.length();
mEditText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(maxLength)});
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
StringBuilder phone = new StringBuilder(s);
Log.d(TAG, "join");
if (count > 0 && !isValid(phone.toString())) {
for (int i = 0; i < phone.length(); i++) {
Log.d(TAG, String.format("%s", phone));
char c = mPattern.charAt(i);
if ((c != '#') && (c != phone.charAt(i))) {
phone.insert(i, c);
}
}
mEditText.setText(phone);
mEditText.setSelection(mEditText.getText().length());
}
}
#Override
public void afterTextChanged(Editable s) {
}
private boolean isValid(String phone)
{
for (int i = 0; i < phone.length(); i++) {
char c = mPattern.charAt(i);
if (c == '#') continue;
if (c != phone.charAt(i)) {
return false;
}
}
return true;
}
}
Use this as follows:
phone = view.findViewById(R.id.phone);
phone.addTextChangedListener(new PhoneTextFormatter(phone, "+7 (###) ###-####"));

If you're only interested in international numbers and you'd like to be able to show the flag of the country that matches the country code in the input, I wrote a small library for that:
https://github.com/tfcporciuncula/phonemoji
Here's how it looks:

Follow the instructions in this Answer to format the EditText mask.
https://stackoverflow.com/a/34907607/1013929
And after that, you can catch the original numbers from the masked string with:
String phoneNumbers = maskedString.replaceAll("[^\\d]", "");

//(123) 456 7890 formate set
private int textlength = 0;
public class MyPhoneTextWatcher implements TextWatcher {
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
String text = etMobile.getText().toString();
textlength = etMobile.getText().length();
if (text.endsWith(" "))
return;
if (textlength == 1) {
if (!text.contains("(")) {
etMobile.setText(new StringBuilder(text).insert(text.length() - 1, "(").toString());
etMobile.setSelection(etMobile.getText().length());
}
} else if (textlength == 5) {
if (!text.contains(")")) {
etMobile.setText(new StringBuilder(text).insert(text.length() - 1, ")").toString());
etMobile.setSelection(etMobile.getText().length());
}
} else if (textlength == 6 || textlength == 10) {
etMobile.setText(new StringBuilder(text).insert(text.length() - 1, " ").toString());
etMobile.setSelection(etMobile.getText().length());
}
}
#Override
public void afterTextChanged(Editable editable) {
}
}

More like clean:
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String text = etyEditText.getText();
int textlength = etyEditText.getText().length();
if (text.endsWith("(") ||text.endsWith(")")|| text.endsWith(" ") || text.endsWith("-") )
return;
switch (textlength){
case 1:
etyEditText.setEditText(new StringBuilder(text).insert(text.length() - 1, "(").toString());
etyEditText.setSelection(etyEditText.getText().length());
break;
case 5:
etyEditText.setEditText(new StringBuilder(text).insert(text.length() - 1, ")").toString());
etyEditText.setSelection(etyEditText.getText().length());
break;
case 6:
etyEditText.setEditText(new StringBuilder(text).insert(text.length() - 1, " ").toString());
etyEditText.setSelection(etyEditText.getText().length());
break;
case 10:
etyEditText.setEditText(new StringBuilder(text).insert(text.length() - 1, "-").toString());
etyEditText.setSelection(etyEditText.getText().length());
break;
}
}

You can use spawns to format phone numbers in Android. This solution is better than the others because it does not change input text. Formatting remains purely visual.
implementation 'com.googlecode.libphonenumber:libphonenumber:7.0.4'
Formatter class:
open class PhoneNumberFormatter : TransformationMethod {
private val mFormatter: AsYouTypeFormatter = PhoneNumberUtil.getInstance().getAsYouTypeFormatter(Locale.getDefault().country)
override fun getTransformation(source: CharSequence, view: View): CharSequence {
val formatted = format(source)
if (source is Spannable) {
setSpans(source, formatted)
return source
}
return formatted
}
override fun onFocusChanged(view: View?, sourceText: CharSequence?, focused: Boolean, direction: Int, previouslyFocusedRect: Rect?) = Unit
private fun setSpans(spannable: Spannable, formatted: CharSequence): CharSequence {
spannable.clearSpawns()
var charterIndex = 0
var formattedIndex = 0
var spawn = ""
val spawns: List<String> = spannable
.map {
spawn = ""
charterIndex = formatted.indexOf(it, formattedIndex)
if (charterIndex != -1){
spawn = formatted.substring(formattedIndex, charterIndex-1)
formattedIndex = charterIndex+1
}
spawn
}
spawns.forEachIndexed { index, sequence ->
spannable.setSpan(CharterSpan(sequence), index, index + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
}
return formatted
}
private fun Spannable.clearSpawns() =
this
.getSpans(0, this.length, CharterSpan::class.java)
.forEach { this.removeSpan(it) }
private fun format(spannable: CharSequence): String {
mFormatter.clear()
var formated = ""
for (i in 0 until spannable.length) {
formated = mFormatter.inputDigit(spannable[i])
}
return formated
}
private inner class CharterSpan(private val charters: String) : ReplacementSpan() {
var space = 0
override fun getSize(paint: Paint, text: CharSequence, start: Int, end: Int, fm: Paint.FontMetricsInt?): Int {
space = Math.round(paint.measureText(charters, 0, charters.length))
return Math.round(paint.measureText(text, start, end)) + space
}
override fun draw(canvas: Canvas, text: CharSequence, start: Int, end: Int, x: Float, top: Int, y: Int, bottom: Int, paint: Paint) {
space = Math.round(paint.measureText(charters, 0, charters.length))
canvas.drawText(text, start, end, x + space, y.toFloat(), paint)
canvas.drawText(charters, x, y.toFloat(), paint)
}
}
}
Uasge:
editText.transformationMethod = formatter

You can use a Regular Expression with pattern matching to extract number from a string.
String s="";
Pattern p = Pattern.compile("\\d+");
Matcher m = p.matcher("(1111)123-456-789"); //editText.getText().toString()
while (m.find()) {
s=s+m.group(0);
}
System.out.println("............"+s);
Output : ............1111123456789

Don't worry. I have make a most of better solution for you. You can see this simple app link below.
private EditText mPasswordField;
public int textLength = 0;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPasswordField = (EditText) findViewById(R.id.password_field);
mPasswordField.addTextChangedListener(this);
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String text = mPasswordField.getText().toString();
textLength = mPasswordField.getText().length();
if (text.endsWith("-") || text.endsWith(" ") || text.endsWith(" "))
return;
if (textLength == 1) {
if (!text.contains("(")) {
mPasswordField.setText(new StringBuilder(text).insert(text.length() - 1, "(").toString());
mPasswordField.setSelection(mPasswordField.getText().length());
}
} else if (textLength == 5) {
if (!text.contains(")")) {
mPasswordField.setText(new StringBuilder(text).insert(text.length() - 1, ")").toString());
mPasswordField.setSelection(mPasswordField.getText().length());
}
} else if (textLength == 6) {
mPasswordField.setText(new StringBuilder(text).insert(text.length() - 1, " ").toString());
mPasswordField.setSelection(mPasswordField.getText().length());
} else if (textLength == 10) {
if (!text.contains("-")) {
mPasswordField.setText(new StringBuilder(text).insert(text.length() - 1, "-").toString());
mPasswordField.setSelection(mPasswordField.getText().length());
}
} else if (textLength == 15) {
if (text.contains("-")) {
mPasswordField.setText(new StringBuilder(text).insert(text.length() - 1, "-").toString());
mPasswordField.setSelection(mPasswordField.getText().length());
}
}else if (textLength == 18) {
if (text.contains("-")) {
mPasswordField.setText(new StringBuilder(text).insert(text.length() - 1, "-").toString());
mPasswordField.setSelection(mPasswordField.getText().length());
}
} else if (textLength == 20) {
Intent i = new Intent(MainActivity.this, Activity2.class);
startActivity(i);
}
}
#Override
public void afterTextChanged(Editable s) {
}
Not: Don't forget "implement TextWatcher" with your activity class.
Link :https://drive.google.com/open?id=0B-yo9VvU7jyBMjJpT29xc2k5bnc
Hope you are feeling cool for this solution.

You can accept only numbers and phone number type using java code
EditText number1 = (EditText) layout.findViewById(R.id.edittext);
number1.setInputType(InputType.TYPE_CLASS_NUMBER|InputType.TYPE_CLASS_PHONE);
number1.setKeyListener(DigitsKeyListener.getInstance("0123456789”));
number1.setFilters(new InputFilter[] {new InputFilter.LengthFilter(14)}); // 14 is max digits
This code will avoid lot of validations after reading input

This code is work for me for (216) 555-5555
etphonenumber.addTextChangedListener(new TextWatcher()
{
#Override
public void onTextChanged(CharSequence s, int start, int before, int count)
{
// TODO Auto-generated method stub
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after)
{
// TODO Auto-generated method stub
}
#Override
public void afterTextChanged(Editable s)
{
String text = etphonenumber.getText().toString();
int textLength = etphonenumber.getText().length();
if (text.endsWith("-") || text.endsWith(" ") || text.endsWith(" "))
return;
if (textLength == 1) {
if (!text.contains("("))
{
etphonenumber.setText(new StringBuilder(text).insert(text.length() - 1, "(").toString());
etphonenumber.setSelection(etphonenumber.getText().length());
}
}
else if (textLength == 5)
{
if (!text.contains(")"))
{
etphonenumber.setText(new StringBuilder(text).insert(text.length() - 1, ")").toString());
etphonenumber.setSelection(etphonenumber.getText().length());
}
}
else if (textLength == 6)
{
etphonenumber.setText(new StringBuilder(text).insert(text.length() - 1, " ").toString());
etphonenumber.setSelection(etphonenumber.getText().length());
}
else if (textLength == 10)
{
if (!text.contains("-"))
{
etphonenumber.setText(new StringBuilder(text).insert(text.length() - 1, "-").toString());
etphonenumber.setSelection(etphonenumber.getText().length());
}
}
}
});

How to format number in android EditText after realtime editing

I have an EditText in which the user should input a number including decimals and i want a thousand separator automatically added onto the input number I tried a couple of other methods but some do not allow floating point numbers so i came up with this code which works well only that the string input is not being edited in realtime to one with possible thousand separators and the errors seem to stem from the s.replace();
am2 = new TextWatcher(){
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {}
public void afterTextChanged(Editable s) {
if (s.toString().equals("")) {
amount.setText("");
value = 0;
}else{
StringBuffer strBuff = new StringBuffer();
char c;
for (int i = 0; i < amount2.getText().toString().length() ; i++) {
c = amount2.getText().toString().charAt(i);
if (Character.isDigit(c)) {
strBuff.append(c);
}
}
value = Double.parseDouble(strBuff.toString());
reverse();
NumberFormat nf2 = NumberFormat.getInstance(Locale.ENGLISH);
((DecimalFormat)nf2).applyPattern("###,###.#######");
s.replace(0, s.length(), nf2.format(value));
}
}
};

This Class solves the problem, allows decimal input and adds the thousand separators.
public class NumberTextWatcher implements TextWatcher {
private DecimalFormat df;
private DecimalFormat dfnd;
private boolean hasFractionalPart;
private EditText et;
public NumberTextWatcher(EditText et)
{
df = new DecimalFormat("#,###.##");
df.setDecimalSeparatorAlwaysShown(true);
dfnd = new DecimalFormat("#,###");
this.et = et;
hasFractionalPart = false;
}
#SuppressWarnings("unused")
private static final String TAG = "NumberTextWatcher";
public void afterTextChanged(Editable s)
{
et.removeTextChangedListener(this);
try {
int inilen, endlen;
inilen = et.getText().length();
String v = s.toString().replace(String.valueOf(df.getDecimalFormatSymbols().getGroupingSeparator()), "");
Number n = df.parse(v);
int cp = et.getSelectionStart();
if (hasFractionalPart) {
et.setText(df.format(n));
} else {
et.setText(dfnd.format(n));
}
endlen = et.getText().length();
int sel = (cp + (endlen - inilen));
if (sel > 0 && sel <= et.getText().length()) {
et.setSelection(sel);
} else {
// place cursor at the end?
et.setSelection(et.getText().length() - 1);
}
} catch (NumberFormatException nfe) {
// do nothing?
} catch (ParseException e) {
// do nothing?
}
et.addTextChangedListener(this);
}
public void beforeTextChanged(CharSequence s, int start, int count, int after)
{
}
public void onTextChanged(CharSequence s, int start, int before, int count)
{
if (s.toString().contains(String.valueOf(df.getDecimalFormatSymbols().getDecimalSeparator())))
{
hasFractionalPart = true;
} else {
hasFractionalPart = false;
}
}
}
Source: http://blog.roshka.com/2012/08/android-edittext-with-number-format.html

Unfortunately the code did not work as it is in the answer.
It has two problems:
It does not work if the phone locale configuration uses "," as a decimal separator.
It does not work if the number has trailing zeros in the decimal part. Example 1.01.
I went crazy to fix it.
Finally I came to this code that worked well on my cell phone:
NumberTextWatcher.java
import android.text.Editable;
import android.text.TextWatcher;
import android.text.method.DigitsKeyListener;
import android.util.Log;
import android.widget.EditText;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.ParseException;
import java.util.Locale;
public class NumberTextWatcher
implements TextWatcher {
private static final String TAG = "NumberTextWatcher";
private final int numDecimals;
private String groupingSep;
private String decimalSep;
private boolean nonUsFormat;
private DecimalFormat df;
private DecimalFormat dfnd;
private boolean hasFractionalPart;
private EditText et;
private String value;
private String replicate(char ch, int n) {
return new String(new char[n]).replace("\0", "" + ch);
}
public NumberTextWatcher(EditText et, Locale locale, int numDecimals) {
et.setKeyListener(DigitsKeyListener.getInstance("0123456789.,"));
this.numDecimals = numDecimals;
DecimalFormatSymbols symbols = new DecimalFormatSymbols(locale);
char gs = symbols.getGroupingSeparator();
char ds = symbols.getDecimalSeparator();
groupingSep = String.valueOf(gs);
decimalSep = String.valueOf(ds);
String patternInt = "#,###";
dfnd = new DecimalFormat(patternInt, symbols);
String patternDec = patternInt + "." + replicate('#', numDecimals);
df = new DecimalFormat(patternDec, symbols);
df.setDecimalSeparatorAlwaysShown(true);
df.setRoundingMode(RoundingMode.DOWN);
this.et = et;
hasFractionalPart = false;
nonUsFormat = !decimalSep.equals(".");
value = null;
}
#Override
public void afterTextChanged(Editable s) {
Log.d(TAG, "afterTextChanged");
et.removeTextChangedListener(this);
try {
int inilen, endlen;
inilen = et.getText().length();
String v = value.replace(groupingSep, "");
Number n = df.parse(v);
int cp = et.getSelectionStart();
if (hasFractionalPart) {
int decPos = v.indexOf(decimalSep) + 1;
int decLen = v.length() - decPos;
if (decLen > numDecimals) {
v = v.substring(0, decPos + numDecimals);
}
int trz = countTrailingZeros(v);
StringBuilder fmt = new StringBuilder(df.format(n));
while (trz-- > 0) {
fmt.append("0");
}
et.setText(fmt.toString());
} else {
et.setText(dfnd.format(n));
}
endlen = et.getText().length();
int sel = (cp + (endlen - inilen));
if (sel > 0 && sel <= et.getText().length()) {
et.setSelection(sel);
} else {
// place cursor at the end?
et.setSelection(et.getText().length() - 1);
}
} catch (NumberFormatException | ParseException nfe) {
// do nothing?
}
et.addTextChangedListener(this);
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
Log.d(TAG, "beforeTextChanged");
value = et.getText().toString();
}
private int countTrailingZeros(String str) {
int count = 0;
for (int i = str.length() - 1; i >= 0; i--) {
char ch = str.charAt(i);
if ('0' == ch) {
count++;
} else {
break;
}
}
return count;
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.d(TAG, "onTextChanged");
String newValue = s.toString();
String change = newValue.substring(start, start + count);
String prefix = value.substring(0, start);
String suffix = value.substring(start + before);
if (".".equals(change) && nonUsFormat) {
change = decimalSep;
}
value = prefix + change + suffix;
hasFractionalPart = value.contains(decimalSep);
Log.d(TAG, "VALUE: " + value);
}
}
and then to use it simply to do:
Locale locale = new Locale("es", "AR"); // For example Argentina
int numDecs = 2; // Let's use 2 decimals
TextWatcher tw = new NumberTextWatcher(myEditText, locale, numDecs);
myEditText.addTextChangedListener(tw);

You need to use DecimalFormat class with DecimalFormatSymbols class, check the out following method,
public static String formatAmount(int num)
{
DecimalFormat decimalFormat = new DecimalFormat();
DecimalFormatSymbols decimalFormateSymbol = new DecimalFormatSymbols();
decimalFormateSymbol.setGroupingSeparator(',');
decimalFormat.setDecimalFormatSymbols(decimalFormateSymbol);
return decimalFormat.format(num);
}

you can use kotlin extensions function like this...
fun EditText.onCommaChange(input: (String) -> Unit) {
this.addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(s: Editable?) {
if (!edit) {
edit = true
if (s.toString() != "₹") {
try {
val flNumber = getCommaLessNumber(s.toString()).toInt()
val fNumber = getFormattedAmount(flNumber)
setText(fNumber)
setSelection(text.length)
input(flNumber.toString())
} catch (e: NumberFormatException) {
Timber.e(e)
}
} else {
setText("")
input("")
}
edit = false
}
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}
})}
fun getCommaLessNumber(commaNumber: String): String {
var number = commaNumber.replace("₹", "")
number = number.replace(",".toRegex(), "")
return number}
fun getFormattedAmount(amount: Int): String {
return "₹${String.format("%,d", amount)}"}
fun EditText.text() = this.text.toString()

import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.text.DecimalFormat;
public class MyNumberWatcher_3Digit implements TextWatcher {
private EditText editText;
private int digit;
public MyNumberWatcher_3Digit(EditText editText) {
this.editText = editText;
}
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void afterTextChanged(Editable editable) {
editText.removeTextChangedListener( this );
String s = editText.getText().toString();
s = s.replace( ",", "" ).replace( "٬", "" );
s = replaceNonstandardDigits( s );
if (s.length() > 0) {
DecimalFormat sdd = new DecimalFormat( "#,###" );
Double doubleNumber = Double.parseDouble( s );
String format = sdd.format( doubleNumber );
editText.setText( format );
editText.setSelection( format.length() );
}
editText.addTextChangedListener( this );
}
static String replaceNonstandardDigits(String input) {
if (input == null || input.isEmpty()) {
return input;
}
StringBuilder builder = new StringBuilder();
for (int i = 0; i < input.length(); i++) {
char ch = input.charAt( i );
if (isNonstandardDigit( ch )) {
int numericValue = Character.getNumericValue( ch );
if (numericValue >= 0) {
builder.append( numericValue );
}
} else {
builder.append( ch );
}
}
return builder.toString();
}
private static boolean isNonstandardDigit(char ch) {
return Character.isDigit( ch ) && !(ch >= '0' && ch <= '9');
}
}
// oncreate activity
input_text_rate.addTextChangedListener(new MyNumberWatcher_3Digit(input_text_rate));

I used this way in Kotlin for a Dialog:
val et = dialog.findViewById(R.id.etNumber) as EditText
et.addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(s: Editable) {
et.removeTextChangedListener(this)
forChanged(et)
et.addTextChangedListener(this)
}
override fun beforeTextChanged(
s: CharSequence,
start: Int,
count: Int,
after: Int
) {
}
override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
}
})
then write a method like this:
private fun forChanged(alpha: EditText) {
val string = alpha.text.toString()
val dec = DecimalFormat("#,###")
if (!TextUtils.isEmpty(string)) {
val textWC = string.replace(",".toRegex(), "")
val number = textWC.toDouble()
alpha.setText(dec.format(number))
alpha.setSelection(dec.format(number).length)
}
}

I have tried solutions but with ending 0 i was having problem, sometimes user just wanted to enter 0.01 or 0.0001,
I don't know if any other have posted same answer or not but if this helps,
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.widget.EditText;
import java.text.DecimalFormat;
public class NumberTextWatcher implements TextWatcher {
private DecimalFormat dfnd;
private boolean hasFractionalPart;
private EditText inputView;
public static void bindView(EditText inputView) {
NumberTextWatcher temp = new NumberTextWatcher(inputView);
inputView.addTextChangedListener(temp);
}
public NumberTextWatcher(EditText inputView) {
dfnd = new DecimalFormat("#,###.######");
this.inputView = inputView;
hasFractionalPart = false;
}
#SuppressWarnings("unused")
private static final String TAG = "NumberTextWatcher";
public void afterTextChanged(Editable s) {
Log.d(TAG, "afterTextChanged() called with: s = [" + s + "]");
inputView.removeTextChangedListener(this);
try {
String text = inputView.getText().toString().replace(String.valueOf(dfnd.getDecimalFormatSymbols().getGroupingSeparator()), "");
if(text.charAt(text.length() - 1) == '.')
{
if(getCount(text,'.') >1)
{
text = text.substring(0,text.length()-1);
}
}
String afterDecimalPoint = "";
String beforeDecimalPoint = text;
if (hasFractionalPart || (text.charAt(text.length() - 1) == '0')) {
String[] data = text.split("\\.");
beforeDecimalPoint = data[0];
if (data.length != 2) {
afterDecimalPoint = ".";
} else {
afterDecimalPoint = "." + data[1];
if (data[1].length() >= dfnd.getMaximumFractionDigits()) {
afterDecimalPoint = "." + data[1].substring(0, dfnd.getMaximumFractionDigits());
}
}
}
beforeDecimalPoint = dfnd.format(Double.parseDouble(beforeDecimalPoint));
String finalText = beforeDecimalPoint;
if (hasFractionalPart) {
finalText = beforeDecimalPoint + afterDecimalPoint;
}
inputView.setText(finalText);
inputView.setSelection(finalText.length());
} catch (Exception nfe) {
// do nothing?
nfe.printStackTrace();
}
inputView.addTextChangedListener(this);
}
private int getCount(String someString, char someChar) {
int count = 0;
for (int i = 0; i < someString.length(); i++) {
if (someString.charAt(i) == someChar) {
count++;
}
}
return count;
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.toString().contains(String.valueOf(dfnd.getDecimalFormatSymbols().getDecimalSeparator()))) {
hasFractionalPart = true;
} else {
hasFractionalPart = false;
}
}
}

How to Automatically add thousand separators as number is input in EditText

Im creating a convertor application. I want to set the EditText so that when the user is inputting the number to be converted, a thousand separator (,) should be added automatically in realtime to the number once it increments by 3 figures: thousand, million, billion etc.
And when erased to below 4 figures the number goes back to normal.
Any help?

Even-though It's late. Intended for future visitors.
Fetures of the following codes
Puts thousand separator in EditText as it's text changes.
adds 0. Automatically when pressed period (.) At First.
Ignores 0 input at Beginning.
Just copy the following
Class named
NumberTextWatcherForThousand which implements TextWatcher
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.util.StringTokenizer;
/**
* Created by skb on 12/14/2015.
*/
public class NumberTextWatcherForThousand implements TextWatcher {
EditText editText;
public NumberTextWatcherForThousand(EditText editText) {
this.editText = editText;
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
try
{
editText.removeTextChangedListener(this);
String value = editText.getText().toString();
if (value != null && !value.equals(""))
{
if(value.startsWith(".")){
editText.setText("0.");
}
if(value.startsWith("0") && !value.startsWith("0.")){
editText.setText("");
}
String str = editText.getText().toString().replaceAll(",", "");
if (!value.equals(""))
editText.setText(getDecimalFormattedString(str));
editText.setSelection(editText.getText().toString().length());
}
editText.addTextChangedListener(this);
return;
}
catch (Exception ex)
{
ex.printStackTrace();
editText.addTextChangedListener(this);
}
}
public static String getDecimalFormattedString(String value)
{
StringTokenizer lst = new StringTokenizer(value, ".");
String str1 = value;
String str2 = "";
if (lst.countTokens() > 1)
{
str1 = lst.nextToken();
str2 = lst.nextToken();
}
String str3 = "";
int i = 0;
int j = -1 + str1.length();
if (str1.charAt( -1 + str1.length()) == '.')
{
j--;
str3 = ".";
}
for (int k = j;; k--)
{
if (k < 0)
{
if (str2.length() > 0)
str3 = str3 + "." + str2;
return str3;
}
if (i == 3)
{
str3 = "," + str3;
i = 0;
}
str3 = str1.charAt(k) + str3;
i++;
}
}
public static String trimCommaOfString(String string) {
// String returnString;
if(string.contains(",")){
return string.replace(",","");}
else {
return string;
}
}
}
Use This Class on your EditText as follows
editText.addTextChangedListener(new NumberTextWatcherForThousand(editText));
To get the input as plain Double Text
Use the trimCommaOfString method of the same class like this
NumberTextWatcherForThousand.trimCommaOfString(editText.getText().toString())
Git

You can use String.format() in a TextWatcher. The comma in the format specifier does the trick.
This does not work for floating point input. And be careful not to set an infinite loop with the TextWatcher.
public void afterTextChanged(Editable view) {
String s = null;
try {
// The comma in the format specifier does the trick
s = String.format("%,d", Long.parseLong(view.toString()));
} catch (NumberFormatException e) {
}
// Set s back to the view after temporarily removing the text change listener
}

public static String doubleToStringNoDecimal(double d) {
DecimalFormat formatter = (DecimalFormat) NumberFormat.getInstance(Locale.US);
formatter.applyPattern("#,###");
return formatter.format(d);
}

This sample app deconstructs formatting numbers clearly.
To summarize the link above, use a TextWatcher and in the afterTextChanged() method format the EditText view with the following logic:
#Override
public void afterTextChanged(Editable s) {
editText.removeTextChangedListener(this);
try {
String originalString = s.toString();
Long longval;
if (originalString.contains(",")) {
originalString = originalString.replaceAll(",", "");
}
longval = Long.parseLong(originalString);
DecimalFormat formatter = (DecimalFormat) NumberFormat.getInstance(Locale.US);
formatter.applyPattern("#,###,###,###");
String formattedString = formatter.format(longval);
//setting text after format to EditText
editText.setText(formattedString);
editText.setSelection(editText.getText().length());
} catch (NumberFormatException nfe) {
nfe.printStackTrace();
}
editText.addTextChangedListener(this);
}

I know i am very late to the party but it may be very useful for future users. My answer is an extension of Shree Krishna's answer.
Improvements:
Thousands separators and Decimal markers are locale aware i.e. they are used accordingly to the Locale of the device.
The cursor position doesn't change after deleting or adding elements in the middle also (In his answer cursor was reset to the end).
The overall quality of the code has been improved specially the getDecimalFormattedString method.
Code:
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.text.DecimalFormat;
/**
* Created by srv_twry on 4/12/17.
* Source: https://stackoverflow.com/a/34265406/137744
* The custom TextWatcher that automatically adds thousand separators in EditText.
*/
public class ThousandSeparatorTextWatcher implements TextWatcher {
private DecimalFormat df;
private EditText editText;
private static String thousandSeparator;
private static String decimalMarker;
private int cursorPosition;
public ThousandSeparatorTextWatcher(EditText editText) {
this.editText = editText;
df = new DecimalFormat("#,###.##");
df.setDecimalSeparatorAlwaysShown(true);
thousandSeparator = Character.toString(df.getDecimalFormatSymbols().getGroupingSeparator());
decimalMarker = Character.toString(df.getDecimalFormatSymbols().getDecimalSeparator());
}
#Override
public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
cursorPosition = editText.getText().toString().length() - editText.getSelectionStart();
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}
#Override
public void afterTextChanged(Editable s) {
try {
editText.removeTextChangedListener(this);
String value = editText.getText().toString();
if (value != null && !value.equals("")) {
if (value.startsWith(decimalMarker)) {
String text = "0" + decimalMarker;
editText.setText(text);
}
if (value.startsWith("0") && !value.startsWith("0" + decimalMarker)) {
int index = 0;
while (index < value.length() && value.charAt(index) == '0') {
index++;
}
String newValue = Character.toString(value.charAt(0));
if (index != 0) {
newValue = value.charAt(0) + value.substring(index);
}
editText.setText(newValue);
}
String str = editText.getText().toString().replaceAll(thousandSeparator, "");
if (!value.equals("")) {
editText.setText(getDecimalFormattedString(str));
}
editText.setSelection(editText.getText().toString().length());
}
//setting the cursor back to where it was
editText.setSelection(editText.getText().toString().length() - cursorPosition);
editText.addTextChangedListener(this);
} catch (Exception ex) {
ex.printStackTrace();
editText.addTextChangedListener(this);
}
}
private static String getDecimalFormattedString(String value) {
String[] splitValue = value.split("\\.");
String beforeDecimal = value;
String afterDecimal = null;
String finalResult = "";
if (splitValue.length == 2) {
beforeDecimal = splitValue[0];
afterDecimal = splitValue[1];
}
int count = 0;
for (int i = beforeDecimal.length() - 1; i >= 0 ; i--) {
finalResult = beforeDecimal.charAt(i) + finalResult;
count++;
if (count == 3 && i > 0) {
finalResult = thousandSeparator + finalResult;
count = 0;
}
}
if (afterDecimal != null) {
finalResult = finalResult + decimalMarker + afterDecimal;
}
return finalResult;
}
/*
* Returns the string after removing all the thousands separators.
* */
public static String getOriginalString(String string) {
return string.replace(thousandSeparator,"");
}
}

This solution has some advantage over other answers. For example, it keeps the user's cursor position even if they edit the beginning or middle of the number. Other solutions always jump the cursor to the end of the number. It handles decimals and whole numbers, as well as locales that use characters other than . for the decimal separator and , for the thousands grouping separator.
class SeparateThousands(val groupingSeparator: String, val decimalSeparator: String) : TextWatcher {
private var busy = false
override fun afterTextChanged(s: Editable?) {
if (s != null && !busy) {
busy = true
var place = 0
val decimalPointIndex = s.indexOf(decimalSeparator)
var i = if (decimalPointIndex == -1) {
s.length - 1
} else {
decimalPointIndex - 1
}
while (i >= 0) {
val c = s[i]
if (c == groupingSeparator[0] ) {
s.delete(i, i + 1)
} else {
if (place % 3 == 0 && place != 0) {
// insert a comma to the left of every 3rd digit (counting from right to
// left) unless it's the leftmost digit
s.insert(i + 1, groupingSeparator)
}
place++
}
i--
}
busy = false
}
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
}
}
Then in xml:
<EditText
android:id="#+id/myNumberField"
android:digits=",.0123456789"
android:inputType="numberDecimal"
.../>
And finally register the watcher:
findViewById(R.id.myNumberField).addTextChangedListener(
SeparateThousands(groupingSeparator, decimalSeparator))
To handle . vs , in different locales use groupingSeparator and decimalSeparator, which can come from DecimalFormatSymbols or localized strings.

I just wanted comma to be placed and this is working for me:
String.format("%,.2f", myValue);

Here is my ThousandNumberEditText class
public class ThousandNumberEditText extends android.support.v7.widget.AppCompatEditText {
// TODO: 14/09/2017 change it if you want
private static final int MAX_LENGTH = 20;
private static final int MAX_DECIMAL = 3;
public ThousandNumberEditText(Context context) {
this(context, null);
}
public ThousandNumberEditText(Context context, AttributeSet attrs) {
this(context, attrs, android.support.v7.appcompat.R.attr.editTextStyle);
}
public ThousandNumberEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
addTextChangedListener(new ThousandNumberTextWatcher(this));
setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);
setFilters(new InputFilter[] { new InputFilter.LengthFilter(MAX_LENGTH) });
setHint("0"); // TODO: 14/09/2017 change it if you want
}
private static class ThousandNumberTextWatcher implements TextWatcher {
private EditText mEditText;
ThousandNumberTextWatcher(EditText editText) {
mEditText = editText;
}
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void afterTextChanged(Editable editable) {
String originalString = editable.toString();
String cleanString = originalString.replaceAll("[,]", "");
if (cleanString.isEmpty()) {
return;
}
String formattedString = getFormatString(cleanString);
mEditText.removeTextChangedListener(this);
mEditText.setText(formattedString);
mEditText.setSelection(mEditText.getText().length());
mEditText.addTextChangedListener(this);
}
/**
* Return the format string
*/
private String getFormatString(String cleanString) {
if (cleanString.contains(".")) {
return formatDecimal(cleanString);
} else {
return formatInteger(cleanString);
}
}
private String formatInteger(String str) {
BigDecimal parsed = new BigDecimal(str);
DecimalFormat formatter;
formatter = new DecimalFormat("#,###");
return formatter.format(parsed);
}
private String formatDecimal(String str) {
if (str.equals(".")) {
return ".";
}
BigDecimal parsed = new BigDecimal(str);
DecimalFormat formatter;
formatter =
new DecimalFormat("#,###." + getDecimalPattern(str)); //example patter #,###.00
return formatter.format(parsed);
}
/**
* It will return suitable pattern for format decimal
* For example: 10.2 -> return 0 | 10.23 -> return 00 | 10.235 -> return 000
*/
private String getDecimalPattern(String str) {
int decimalCount = str.length() - 1 - str.indexOf(".");
StringBuilder decimalPattern = new StringBuilder();
for (int i = 0; i < decimalCount && i < MAX_DECIMAL; i++) {
decimalPattern.append("0");
}
return decimalPattern.toString();
}
}
}
Using
<.ThousandNumberEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>

You can use this method:
myEditText.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String input = s.toString();
if (!input.isEmpty()) {
input = input.replace(",", "");
DecimalFormat format = new DecimalFormat("#,###,###");
String newPrice = format.format(Double.parseDouble(input));
myEditText.removeTextChangedListener(this); //To Prevent from Infinite Loop
myEditText.setText(newPrice);
myEditText.setSelection(newPrice.length()); //Move Cursor to end of String
myEditText.addTextChangedListener(this);
}
}
#Override
public void afterTextChanged(final Editable s) {
}
});
And to get original text use this:
String input = myEditText.getText().toString();
input = input.replace(",", "");

Since i had the same problem i decided to find a solution to it
Find my function below i hope it helps people finding solution
securityDeposit.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start,
int before, int count) {
// TODO Auto-generated method stub
}
#Override
public void beforeTextChanged(CharSequence s, int start,
int before, int count) {
// TODO Auto-generated method stub
}
#Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
if (s.toString().trim().length() > 0) {
int rentValue = Integer.parseInt(s.toString()
.replaceAll(",", ""));
StringBuffer rentVal = new StringBuffer();
if (rentValue > 10000000) {
s.clear();
s.append("10,000,000");
} else {
if (s.length() == 4) {
char x[] = s.toString().toCharArray();
char y[] = new char[x.length + 1];
for (int z = 0; z < y.length; z++) {
if (z == 1) {
y[1] = ',';
} else {
if (z == 0)
y[z] = x[z];
else {
y[z] = x[z - 1];
}
}
}
for (int z = 0; z < y.length; z++) {
rentVal = rentVal.append(y[z]);
}
s.clear();
s.append(rentVal);
}
}
}
}
});

you can use this code in many ways in your program, you give it a string and it separate each three from right and place space there.
private String Spacer(String number){
StringBuilder strB = new StringBuilder();
strB.append(number);
int Three = 0;
for(int i=number.length();i>0;i--){
Three++;
if(Three == 3){
strB.insert(i-1, " ");
Three = 0;
}
}
return strB.toString();
}// end Spacer()
u can change it a bit and use it ontextchangelistener.
good luck

The answers here lack a method to handle actual user input, such as deleting characters or copying and pasting. This is an EditText field. If you want to add formatting in, you need to support editing that formatted value.
This implementation still has a deficiency depending on your use case. I didn't care about decimal values and assumed I would only be handling whole numbers. There's enough of how to handle that on this page and how to handle actual internationalization that I'll leave that as an exercise to the reader. If you need to do that, it shouldn't be too difficult to add "." to the regular expression to keep the decimal; you'll just have to be careful to acknowledge the numeral string still has a non numerical character.
This is designed to be used throughout multiple activities. New it once, give it your edit text and your data model and ignore it. The model binding can be removed if you don't need it.
public class EditNumberFormatter implements TextWatcher {
private EditText watched;
private Object model;
private Field field;
private IEditNumberFormatterListener listener;
private ActiveEdit activeEdit;
/**
* Binds an EditText to a data model field (Such as a room entity's public variable)
* Whenever the edit text is changed, the text is formatted to the local numerical format.
*
* Handles copy/paste/backspace/select&delete/typing
*
* #param model An object with a public field to bind to
* #param fieldName A field defined on the object
* #param watched The edit text to watch for changes
* #param listener Another object that wants to know after changes & formatting are done.
*/
public EditNumberFormatter(Object model, String fieldName, EditText watched, IEditNumberFormatterListener listener) {
this.model = model;
this.watched = watched;
this.listener = listener;
try {
field = model.getClass().getDeclaredField(fieldName);
} catch(Exception e) { }
watched.addTextChangedListener(this);
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
activeEdit = new ActiveEdit(s.toString(), start, count);
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
activeEdit.recordChangedText(s.toString(),count);
}
#Override
public void afterTextChanged(Editable s) {
this.watched.removeTextChangedListener(this);
activeEdit.processEdit(); // Override the user's edit of the formatted string with what the user intended to do to the numeral.
watched.setText(activeEdit.getCurrentFormattedString());
watched.setSelection(activeEdit.getCursorPosition());
updateDataModel(activeEdit.getCurrentRawValue());
listener.FormatUpdated(watched.getId(), activeEdit.getCurrentRawValue(), activeEdit.getCurrentFormattedString());
this.watched.addTextChangedListener(this);
}
private void updateDataModel(int rawValue) {
try {
field.set(model, rawValue);
} catch (IllegalAccessException e) { }
}
/**
* Tracks the active editing of an EditText formatted for integer input
*/
private class ActiveEdit {
private String priorFormattedString;
private String currentFormattedString;
private String currentNumericalString;
private int currentRawValue;
private boolean removal;
private boolean addition;
private int changeStart;
private int removedCount;
private int additionCount;
private int numeralCountBeforeSelection;
private int numeralCountAdded;
private int numeralCountRemoved;
/**
* Call in beforeEdit to begin recording changes
*
* #param beforeEdit string before edit began
* #param start start position of edit
* #param removed number of characters removed
*/
public ActiveEdit(String beforeEdit, int start, int removed) {
removal = (removed > 0);
priorFormattedString = beforeEdit;
changeStart = start;
removedCount = removed;
numeralCountBeforeSelection = countNumerals(priorFormattedString.substring(0, changeStart));
numeralCountRemoved = countNumerals(priorFormattedString.substring(changeStart, changeStart + removedCount));
}
/**
* Call in onTextChanged to record new text and how many characters were added after changeStart
*
* #param afterEdit new string after user input
* #param added how many characters were added (same start position as before)
*/
public void recordChangedText(String afterEdit, int added) {
addition = (added > 0);
additionCount = added;
numeralCountAdded = countNumerals(afterEdit.substring(changeStart, changeStart + additionCount));
currentNumericalString = afterEdit.replaceAll("[^0-9]", "");
}
/**
* Re-process the edit for our particular formatting needs.
*/
public void processEdit() {
forceRemovalPastFormatting();
finalizeEdit();
}
/**
* #return Integer value of the field after an edit.
*/
public int getCurrentRawValue() {
return currentRawValue;
}
/**
* #return Formatted number after an edit.
*/
public String getCurrentFormattedString() {
return currentFormattedString;
}
/**
* #return Cursor position after an edit
*/
public int getCursorPosition() {
int numeralPosition = numeralCountBeforeSelection + numeralCountAdded;
return positionAfterNumeralN(currentFormattedString,numeralPosition);
}
/**
* If a user deletes a value, but no numerals are deleted, then delete the numeral proceeding
* their cursor. Otherwise, we'll just add back the formatting character.
*
* Assumes formatting uses a single character and not multiple formatting characters in a row.
*/
private void forceRemovalPastFormatting() {
if (removal && (!addition) && (numeralCountRemoved == 0)) {
String before = currentNumericalString.substring(0, numeralCountBeforeSelection - 1);
String after = currentNumericalString.substring(numeralCountBeforeSelection);
currentNumericalString = before + after;
numeralCountRemoved++;
numeralCountBeforeSelection--;
}
}
/**
* Determine the result of the edit, including new display value and raw value
*/
private void finalizeEdit() {
currentFormattedString = "";
currentRawValue = 0;
if (currentNumericalString.length() == 0) {
return; // There is no entry now.
}
try {
currentRawValue = Integer.parseInt(currentNumericalString);
} catch (NumberFormatException nfe) {
abortEdit(); // Value is not an integer, return to previous state.
return;
}
currentFormattedString = String.format("%,d", currentRawValue);
}
/**
* Current text, same as the old text.
*/
private void abortEdit() {
currentFormattedString = priorFormattedString;
currentNumericalString = currentFormattedString.replaceAll("[^0-9]", "");
numeralCountRemoved = 0;
numeralCountAdded = 0;
try {
currentRawValue = Integer.parseInt(currentNumericalString);
} catch (Exception e) { currentRawValue = 0; }
}
/**
* Determine how many numerical characters exist in a string
* #param s
* #return the number of numerical characters in the string
*/
private int countNumerals(String s) {
String newString = s.replaceAll("[^0-9]", "");
return newString.length();
}
/**
* Determine how to place a cursor after the Nth Numeral in a formatted string.
* #param s - Formatted string
* #param n - The position of the cursor should follow the "Nth" number in the string
* #return the position of the nth character in a formatted string
*/
private int positionAfterNumeralN(String s, int n) {
int numeralsFound = 0;
if (n == 0) {
return 0;
}
for (int i = 0; i < s.length(); i++) {
if(s.substring(i,i+1).matches("[0-9]")) {
if(++numeralsFound == n) {
return i + 1;
}
}
}
return s.length();
}
}
}
At a highlevel, what that does is:
Determine which numbers were actually in the string after it was edited
Process the edit to the numeral version of the string if the numbers weren't edited
Convert the numeral back to a formatted string
Determine, where the cursor should be based on where editing began and how much text was added
It also nicely handles edge cases like completely deleted input, integer overflow and erroneous input.

You can use a custom TextInputEditText :
public class NumberTextInputEditText extends TextInputEditText {
public NumberTextInputEditText(#NonNull Context context) {
super(context);
}
public NumberTextInputEditText(#NonNull Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
}
public NumberTextInputEditText(#NonNull Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
addTextChangedListener(textWatcher);
}
public String formatNumber(double number) {
DecimalFormat decimalFormat = new DecimalFormat("#,###");
return decimalFormat.format(number);
}
public TextWatcher textWatcher = new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void afterTextChanged(Editable editable) {
removeTextChangedListener(this);
String text = getText().toString();
String format = "";
if (!TextUtils.isEmpty(text)) {
try {
format = formatNumber(Double.parseDouble(new BigDecimal(text.replaceAll(",", "")).toString()));
} catch (NumberFormatException e) {
format = "";
}
setText(format);
setSelection(format.length());
}
addTextChangedListener(this);
}
};}
just use it like a view in your layout:
<com.your.package.name.NumberTextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

Here i have tested my application code. text-watcher how to add comma in currency thousand, lake currency.
private TextWatcher textWatcherAmount = new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String initial = s.toString();
if (inputEdtHawalaRate == null) return;
if (!TextUtils.isEmpty(initial)) {
initial = initial.replace(",", "");
NumberFormat formatter = new DecimalFormat("##,##,###");
inputEdtHawalaRate.removeTextChangedListener(this);
double myNumber = Double.parseDouble(initial);
String processed = formatter.format(myNumber);
//Assign processed text
inputEdtHawalaRate.setText(processed);
try {
inputEdtHawalaRate.setSelection(processed.length());
} catch (Exception e) {
e.printStackTrace();
}
//Give back the listener
inputEdtHawalaRate.addTextChangedListener(this);
}
}
#Override
public void afterTextChanged(Editable s) {
}
};
if (inputEdtHawalaRate != null) {
inputEdtHawalaRate.addTextChangedListener(textWatcherAmount);
}
// getting amount on double type varaible (On textwatcher editetxt value get).
String amount = Objects.requireNonNull(inputEdtHawalaRate.getText()).toString().trim();
double hawalaAmount = 0.0;
String[] a = amount.split(",");
finalAmount = TextUtils.join("", a);
hawalaAmount = Double.parseDouble(finalAmount);

I was looking for a locale aware solution since we have customers across the globe. So I built upon dr0pdb's answer.
Here's a TextWatcher class (in kotlin) I have created to solve this.
https://github.com/abhilashd-locus/edittext-locale-aware-thousands-separator
Features:
Add thousands separator dynamically as the user types
Enable editing in between the string and not only at the ends
Style of thousands separation is based upon the locale (eg: 100,000 vs 1,00,000)
Symbol of thousands separator and decimal marker is based on the locale (eg: 100,000.00 vs 100.000,00)
Supports all languages and locales
Disadvantages:
Does not support copy/paste operations
In right-to-left languages (eg. Arabic), the cursor jumps to the end on deleting the first number
.
// ThousandsSeparatorTextWatcher.kt --> add this TextWatcher to the
// EditText you want to add the functionality of dynamic locale aware thousands separator
class ThousandsSeparatorTextWatcher(private var editText: EditText?, private val callback: TextChangedCallback) : TextWatcher {
//keeping a count of the digits before the cursor to reset the cursor at the correct place
private var digitsBeforeCursor = -1
private val thousandSeparator: Char = DecimalFormatSymbols(Locale.getDefault()).groupingSeparator
private val decimalMarker: Char = DecimalFormatSymbols(Locale.getDefault()).decimalSeparator
init {
editText?.apply {
addTextChangedListener(this#ThousandsSeparatorTextWatcher)
//disabling copy/paste to avoid format and parse errors
disableTextSelection(this)
//diabling text selection
isLongClickable = false
setTextIsSelectable(false)
//ensuring correct input type
keyListener = DigitsKeyListener.getInstance("0123456789$decimalMarker");
}
}
private fun disableTextSelection(editText: EditText) {
editText.customSelectionActionModeCallback = object : android.view.ActionMode.Callback {
override fun onActionItemClicked(mode: android.view.ActionMode?, item: MenuItem?) = false
override fun onCreateActionMode(mode: android.view.ActionMode?, menu: Menu?) = false
override fun onPrepareActionMode(mode: android.view.ActionMode?, menu: Menu?) = false
override fun onDestroyActionMode(mode: android.view.ActionMode?) {}
}
}
/***
* We are going to calculate the number of numeric digits before the cursor when user starts editing
* We will keep a count of this number to reset the cursor to the correct position after editing is complete
*/
override fun beforeTextChanged(sequenceBeforeEdit: CharSequence, startPos: Int, count: Int, after: Int) {
val textBeforeEdit = sequenceBeforeEdit.toString()
if (textBeforeEdit.isEmpty()) {
//in an empty string, cursor position is at 1 if a character is being added (after == 1)
//if a character is not being added, cursor position remains at the beginning
digitsBeforeCursor = if (after == 0) -1 else 1
return
}
digitsBeforeCursor = if (after == 0) {
//if characters are being removed
//count will always be 1 since we have disabled selection (in which case count will be equal to the number of characters selected)
val textBeforeNewCursor = textBeforeEdit.substring(0, startPos)
textBeforeNewCursor.count { it != thousandSeparator }
} else {
//if characters are being added
//after will always be 1 since we have disabled pasting (in which case after will be equal to the number of characters being pasted)
if (startPos == textBeforeEdit.length) {
//if adding a character to the end of the string
textBeforeEdit.count { it != thousandSeparator } + 1
} else {
//if adding a character in between the string
val textBeforeNewCursor = textBeforeEdit.substring(0, startPos + 1)
textBeforeNewCursor.count { it != thousandSeparator }
}
}
}
override fun onTextChanged(textAfterEdit: CharSequence, start: Int, before: Int, count: Int) {}
/***
* We will get the numeric value in the editText after stripping all the formatting
* We will then reformat this number to add the correct thousands separation and decimal marker according to the locale
* We then set the cursor to the correct position as we calculated in beforeTextChanged()
*/
override fun afterTextChanged(editable: Editable) {
val text = editable.toString()
//if the EditText is cleared, trigger callback with a null value to indicate an empty field
if (text.isEmpty()) {
digitsBeforeCursor = -1
callback.onChanged(null)
return
}
//get the double value of the entered number
val numberValue = getNumberFromFormattedCurrencyText(text)
//re-format the number to get the correct separation format and symbols
var newText = getCurrencyFormattedAmountValue(numberValue)
//If user was inputting decimal part of the number, reformatting will return a string without decimal point.
//So we need to add it back after the reformatting is complete
if (text.endsWith(decimalMarker)) {
newText += decimalMarker
} else if (text.endsWith(decimalMarker + "0")) {
newText += decimalMarker + "0"
}
//removing the listener to prevent infinite triggers
editText?.removeTextChangedListener(this)
//set the reformatted text
editText?.setText(newText)
//send the number typed to the callback
callback.onChanged(numberValue)
//set the cursor to the right position after reformatting the string
if (digitsBeforeCursor != -1) {
var numbersParsed = 0
for (i in newText.indices) {
if (newText[i] != thousandSeparator) {
numbersParsed++
}
if (numbersParsed == digitsBeforeCursor) {
editText?.setSelection(i + 1)
break
}
}
digitsBeforeCursor = -1
}
//add the listener back
editText?.addTextChangedListener(this)
}
/***
* Function to remove the listener and release reference to the EditText
*/
fun removeWatcherFromEditText() {
editText?.removeTextChangedListener(this)
editText = null
}
interface TextChangedCallback {
fun onChanged(newNumber: Double?)
}
companion object{
#JvmStatic
fun getNumberFromFormattedCurrencyText(formattedText: String?) = formattedText?.let {
val numberFormat = NumberFormat.getNumberInstance(Locale.getDefault())
try {
numberFormat.parse(it)?.toDouble()
} catch (exception: ParseException) {
0.0
}
} ?: 0.0
#JvmStatic
fun getCurrencyFormattedAmountValue(amount: Double?) = amount?.let {
val numberFormat = NumberFormat.getNumberInstance(Locale.getDefault())
numberFormat.maximumFractionDigits = 2
numberFormat.format(amount)
} ?: ""
}
}

I know it's late but maybe can help
fun generate_seprators(input: String?): String? {
var input = input
var result = ""
var float_section = ""
if (input == null) input = ""
var temp = input.trim { it <= ' ' }
temp = temp.replace(",", "")
var input_array = temp.split(".")
var decimal_section = input_array[0]
if(input_array.size>1)
float_section = input_array[1]
if (decimal_section.length > 3) {
var num = 0
for (i in decimal_section.length downTo 1) {
if (num == 3) {
num = 0
result = ",$result"
}
num++
result = decimal_section.substring(i - 1, i) + result
}
if(float_section!="")
result = "$result.$float_section"
} else {
result = decimal_section.replace(",", "")
if(float_section!="")
result = "$result.$float_section"
}
return result
}

Format credit card in edit text in android

How to make EditText accept input in format:
4digit 4digit 4digit 4digit
I tried Custom format edit text input android to accept credit card number, but unfortunately I was unable to delete the spaces. Whenever there is a space, I could not to delete it. Please help me in finding out the issue.

After finding multiple answers that are 'OK'. I moved towards a better TextWatcher which is designed to work correctly and independently from the TextView.
TextWatcher class is as follows:
/**
* Formats the watched EditText to a credit card number
*/
public static class FourDigitCardFormatWatcher implements TextWatcher {
// Change this to what you want... ' ', '-' etc..
private static final char space = ' ';
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void afterTextChanged(Editable s) {
// Remove spacing char
if (s.length() > 0 && (s.length() % 5) == 0) {
final char c = s.charAt(s.length() - 1);
if (space == c) {
s.delete(s.length() - 1, s.length());
}
}
// Insert char where needed.
if (s.length() > 0 && (s.length() % 5) == 0) {
char c = s.charAt(s.length() - 1);
// Only if its a digit where there should be a space we insert a space
if (Character.isDigit(c) && TextUtils.split(s.toString(), String.valueOf(space)).length <= 3) {
s.insert(s.length() - 1, String.valueOf(space));
}
}
}
}
Then add it to your TextView as you would any other TextWatcher.
{
//...
mEditTextCreditCard.addTextChangedListener(new FourDigitCardFormatWatcher());
}
This will auto delete the space sensibly going back so the user can actually do less keystrokes when editing.
Caveat
If you are using inputType="numberDigit" this will disable the '-' and ' ' chars, so I recommend using, inputType="phone". This enables other chars, but just use a custom inputfilter and problem solved.

Example on github.com
Late answer, but I guess it may helpful for somebody:
cardNumberEditText.addTextChangedListener(new TextWatcher() {
private static final int TOTAL_SYMBOLS = 19; // size of pattern 0000-0000-0000-0000
private static final int TOTAL_DIGITS = 16; // max numbers of digits in pattern: 0000 x 4
private static final int DIVIDER_MODULO = 5; // means divider position is every 5th symbol beginning with 1
private static final int DIVIDER_POSITION = DIVIDER_MODULO - 1; // means divider position is every 4th symbol beginning with 0
private static final char DIVIDER = '-';
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// noop
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// noop
}
#Override
public void afterTextChanged(Editable s) {
if (!isInputCorrect(s, TOTAL_SYMBOLS, DIVIDER_MODULO, DIVIDER)) {
s.replace(0, s.length(), buildCorrectString(getDigitArray(s, TOTAL_DIGITS), DIVIDER_POSITION, DIVIDER));
}
}
private boolean isInputCorrect(Editable s, int totalSymbols, int dividerModulo, char divider) {
boolean isCorrect = s.length() <= totalSymbols; // check size of entered string
for (int i = 0; i < s.length(); i++) { // check that every element is right
if (i > 0 && (i + 1) % dividerModulo == 0) {
isCorrect &= divider == s.charAt(i);
} else {
isCorrect &= Character.isDigit(s.charAt(i));
}
}
return isCorrect;
}
private String buildCorrectString(char[] digits, int dividerPosition, char divider) {
final StringBuilder formatted = new StringBuilder();
for (int i = 0; i < digits.length; i++) {
if (digits[i] != 0) {
formatted.append(digits[i]);
if ((i > 0) && (i < (digits.length - 1)) && (((i + 1) % dividerPosition) == 0)) {
formatted.append(divider);
}
}
}
return formatted.toString();
}
private char[] getDigitArray(final Editable s, final int size) {
char[] digits = new char[size];
int index = 0;
for (int i = 0; i < s.length() && index < size; i++) {
char current = s.charAt(i);
if (Character.isDigit(current)) {
digits[index] = current;
index++;
}
}
return digits;
}
});
this works perfectly with start-string/end-string/mid-string editing, also paste works perfectly.

I modified Chris Jenkins answer to make it more robust. With this, even if the user edits the middle of the text, the spacing characters are still inserted (and automatically removed on wrong places) correctly.
To make this work correctly, make sure the EditText attributes are set as follows (note the space on digits):
android:digits="01234 56789"
android:inputType="number"
android:maxLength="19"
Then here is the TextWatcher you need. The anonymous class can also be made static since this is independent of the EditText.
yourTextView.addTextChangedListener(new TextWatcher() {
private static final char space = ' ';
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void afterTextChanged(Editable s) {
// Remove all spacing char
int pos = 0;
while (true) {
if (pos >= s.length()) break;
if (space == s.charAt(pos) && (((pos + 1) % 5) != 0 || pos + 1 == s.length())) {
s.delete(pos, pos + 1);
} else {
pos++;
}
}
// Insert char where needed.
pos = 4;
while (true) {
if (pos >= s.length()) break;
final char c = s.charAt(pos);
// Only if its a digit where there should be a space we insert a space
if ("0123456789".indexOf(c) >= 0) {
s.insert(pos, "" + space);
}
pos += 5;
}
}
});

Here is a cleaner solution using regular expressions. Although regular expressions can be inefficient, they would be sufficient in this case since it's processing a string of at most 19 characters, even if the processing occurs after each key press.
editTxtCardNumber.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int arg1, int arg2,
int arg3) { }
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
#Override
public void afterTextChanged(Editable s) {
String initial = s.toString();
// remove all non-digits characters
String processed = initial.replaceAll("\\D", "");
// insert a space after all groups of 4 digits that are followed by another digit
processed = processed.replaceAll("(\\d{4})(?=\\d)", "$1 ");
// to avoid stackoverflow errors, check that the processed is different from what's already
// there before setting
if (!initial.equals(processed)) {
// set the value
s.replace(0, initial.length(), processed);
}
}
});

Here's the class that I use for credit card numbers. Usage examples below.
FormattedNumberEditText.kt
import android.content.Context
import android.text.Editable
import android.text.InputType
import android.text.TextWatcher
import android.text.method.DigitsKeyListener
import android.util.AttributeSet
import android.widget.EditText
open class FormattedNumberEditText : AppCompatEditText {
var prefix = ""
private set
var groupSeparator = ' '
private set
var numberOfGroups = 4
private set
var groupLength = 4
private set
var inputLength = numberOfGroups * (groupLength + 1) - 1
private set
private val digitsKeyListener = DigitsKeyListener.getInstance("0123456789")
private lateinit var separatorAndDigitsKeyListener: DigitsKeyListener
private var initCompleted = false
constructor(context: Context) : super(context) {
init(null)
}
constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
init(attrs)
}
constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
init(attrs)
}
private fun init(attrs: AttributeSet?) {
if (attrs != null) {
val a = context.theme.obtainStyledAttributes(attrs, R.styleable.FormattedNumberEditText, 0, 0)
prefix = a.getString(R.styleable.FormattedNumberEditText_prefix) ?: prefix
val separatorStr = a.getString(R.styleable.FormattedNumberEditText_groupSeparator)
if (!separatorStr.isNullOrEmpty()) {
groupSeparator = separatorStr[0]
}
numberOfGroups = a.getInteger(R.styleable.FormattedNumberEditText_numberOfGroups, numberOfGroups)
groupLength = a.getInteger(R.styleable.FormattedNumberEditText_groupLength, groupLength)
}
inputLength = numberOfGroups * (groupLength + 1) - 1
separatorAndDigitsKeyListener = DigitsKeyListener.getInstance("0123456789$groupSeparator")
setText(prefix)
setSelection(text!!.length)
inputType = InputType.TYPE_CLASS_NUMBER
keyListener = digitsKeyListener
addTextChangedListener(TextChangeListener())
initCompleted = true
}
override fun onSelectionChanged(start: Int, end: Int) {
if (!initCompleted) {
return
}
// make sure input always starts with the prefix
if (!text!!.startsWith(prefix)) {
setText(prefix)
setSelection(text!!.length, text!!.length)
return
}
// make sure cursor is always at the end of the string
if (start != text!!.length || end != text!!.length) {
setSelection(text!!.length)
} else {
super.onSelectionChanged(start, end)
}
}
private inner class TextChangeListener : TextWatcher {
var textBefore = ""
var enteredText = ""
var deletedChars = 0
var listenerEnabled = true
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
if (!listenerEnabled) return
textBefore = text.toString()
enteredText = ""
deletedChars = 0
}
override fun onTextChanged(text: CharSequence?, start: Int, lengthBefore: Int, lengthAfter: Int) {
if (!listenerEnabled) return
if (text == null) {
deletedChars = textBefore.length
return
}
if (text.length < textBefore.length) {
deletedChars = textBefore.length - text.length
return
}
enteredText = text.toString().substring(textBefore.length, text.length)
}
override fun afterTextChanged(s: Editable?) {
if (!listenerEnabled) return
if (s == null) {
return
}
listenerEnabled = false
if (deletedChars > 0) {
handleTextChange(s)
} else {
if (enteredText.length > 1) {
s.replace(s.length - enteredText.length, s.length, "")
// Append one char at a time
enteredText.forEach {
s.append("$it")
handleTextChange(s)
}
} else {
handleTextChange(s)
}
}
listenerEnabled = true
}
fun handleTextChange(s: Editable) {
if (s.length > inputLength) {
while (s.length > inputLength) {
s.delete(s.length - 1, s.length)
}
} else if (s.isNotEmpty() && s.length % (groupLength + 1) == 0) {
if (s.last() == groupSeparator) {
s.delete(s.length - 1, s.length)
} else if (s.last().isDigit() && s.length < inputLength) {
keyListener = separatorAndDigitsKeyListener
s.insert(s.length - 1, groupSeparator.toString())
keyListener = digitsKeyListener
}
}
}
}
}
attrs.xml (belongs in /res/values)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="FormattedNumberEditText">
<attr name="prefix" format="string" />
<attr name="numberOfGroups" format="integer" />
<attr name="groupLength" format="integer" />
<attr name="groupSeparator" format="string" />
</declare-styleable>
</resources>
Usage examples
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Credit card number" />
<com.example.myapplication.FormattedNumberEditText
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="Credit card number (different separator)" />
<com.example.myapplication.FormattedNumberEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:groupSeparator="-" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="Phone number starting with +370" />
<com.example.myapplication.FormattedNumberEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:groupLength="13"
app:groupSeparator=" "
app:numberOfGroups="1"
app:prefix="+370\u0020" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="IBAN number starting with LT" />
<com.example.myapplication.FormattedNumberEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:groupLength="4"
app:groupSeparator=" "
app:numberOfGroups="5"
app:prefix="LT" />
</LinearLayout>

I'm adding my solution to the list. As far as I am aware, it has no drawback; you can edit in the middle, delete spacing characters, copy and paste into it etc.
To allow editing to take place anywhere in the string, and to maintain cursor position, the Editable is traversed and all whitespace (if any) are taken out one by one. New whitespace is then added at appropriate positions. This will ensure that the cursor moves along with the changes made to the contents.
import java.util.LinkedList;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
/**
* Formats the watched EditText to groups of characters, with spaces between them.
*/
public class GroupedInputFormatWatcher implements TextWatcher {
private static final char SPACE_CHAR = ' ';
private static final String SPACE_STRING = String.valueOf(SPACE_CHAR);
private static final int GROUPSIZE = 4;
/**
* Breakdown of this regexp:
* ^ - Start of the string
* (\\d{4}\\s)* - A group of four digits, followed by a whitespace, e.g. "1234 ". Zero or more times.
* \\d{0,4} - Up to four (optional) digits.
* (?<!\\s)$ - End of the string, but NOT with a whitespace just before it.
*
* Example of matching strings:
* - "2304 52"
* - "2304"
* - ""
*/
private final String regexp = "^(\\d{4}\\s)*\\d{0,4}(?<!\\s)$";
private boolean isUpdating = false;
private final EditText editText;
public GroupedInputFormatWatcher(EditText editText) {
this.editText = editText;
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void afterTextChanged(Editable s) {
String originalString = s.toString();
// Check if we are already updating, to avoid infinite loop.
// Also check if the string is already in a valid format.
if (isUpdating || originalString.matches(regexp)) {
return;
}
// Set flag to indicate that we are updating the Editable.
isUpdating = true;
// First all whitespaces must be removed. Find the index of all whitespace.
LinkedList<Integer> spaceIndices = new LinkedList <Integer>();
for (int index = originalString.indexOf(SPACE_CHAR); index >= 0; index = originalString.indexOf(SPACE_CHAR, index + 1)) {
spaceIndices.offerLast(index);
}
// Delete the whitespace, starting from the end of the string and working towards the beginning.
Integer spaceIndex = null;
while (!spaceIndices.isEmpty()) {
spaceIndex = spaceIndices.removeLast();
s.delete(spaceIndex, spaceIndex + 1);
}
// Loop through the string again and add whitespaces in the correct positions
for(int i = 0; ((i + 1) * GROUPSIZE + i) < s.length(); i++) {
s.insert((i + 1) * GROUPSIZE + i, SPACE_STRING);
}
// Finally check that the cursor is not placed before a whitespace.
// This will happen if, for example, the user deleted the digit '5' in
// the string: "1234 567".
// If it is, move it back one step; otherwise it will be impossible to delete
// further numbers.
int cursorPos = editText.getSelectionStart();
if (cursorPos > 0 && s.charAt(cursorPos - 1) == SPACE_CHAR) {
editText.setSelection(cursorPos - 1);
}
isUpdating = false;
}
}

Not sure the TextWatcher is the right thing to use - we should use InputFilter
According to Android documentation, TextWatcher should be used for an external usage example :
one [EditView] for password input +
one [TextView] view which displays "weak", "strong", etc...
For Credit Card Format I am using InputFilter:
public class CreditCardInputFilter implements InputFilter {
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
if (dest != null & dest.toString().trim().length() > 24) return null;
if (source.length() == 1 && (dstart == 4 || dstart == 9 || dstart == 14))
return " " + new String(source.toString());
return null; // keep original
}
}
And combine with a length filter (Android SDK) :
mEditCardNumber.setFilters(new InputFilter[]{
new InputFilter.LengthFilter(24),
new CreditCardInputFilter(),
});
This handle the case when typing and removing a digit.
(!) But this does not handle the case for a copy/paste of an entire string,
this one should be done in a different InputFilter class
Hope it helps !

I just did the next implementation and works well for me, even with pasting and typing new text in any position of the EditText.
Gist file
/**
* Text watcher for giving "#### #### #### ####" format to edit text.
* Created by epool on 3/14/16.
*/
public class CreditCardFormattingTextWatcher implements TextWatcher {
private static final String EMPTY_STRING = "";
private static final String WHITE_SPACE = " ";
private String lastSource = EMPTY_STRING;
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
String source = s.toString();
if (!lastSource.equals(source)) {
source = source.replace(WHITE_SPACE, EMPTY_STRING);
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < source.length(); i++) {
if (i > 0 && i % 4 == 0) {
stringBuilder.append(WHITE_SPACE);
}
stringBuilder.append(source.charAt(i));
}
lastSource = stringBuilder.toString();
s.replace(0, s.length(), lastSource);
}
}
}
Usage: editText.addTextChangedListener(new CreditCardFormattingTextWatcher());

This implementation ensures correct placement of spacing chars, even if the user edits mid-string. Other characters that show up on the soft keyboard (such as dash) are also supported; that is, the user can't enter them. One improvement that could be made: this implementation doesn't allow for the deletion of spacing characters mid-string.
public class CreditCardTextWatcher implements TextWatcher {
public static final char SPACING_CHAR = '-'; // Using a Unicode character seems to stuff the logic up.
#Override
public void beforeTextChanged(final CharSequence s, final int start, final int count, final int after) { }
#Override
public void onTextChanged(final CharSequence s, final int start, final int before, final int count) { }
#Override
public void afterTextChanged(final Editable s) {
if (s.length() > 0) {
// Any changes we make to s in here will cause this method to be run again. Thus we only make changes where they need to be made,
// otherwise we'll be in an infinite loop.
// Delete any spacing characters that are out of place.
for (int i=s.length()-1; i>=0; --i) {
if (s.charAt(i) == SPACING_CHAR // There is a spacing char at this position ,
&& (i+1 == s.length() // And it's either the last digit in the string (bad),
|| (i+1) % 5 != 0)) { // Or the position is not meant to contain a spacing char?
s.delete(i,i+1);
}
}
// Insert any spacing characters that are missing.
for (int i=14; i>=4; i-=5) {
if (i < s.length() && s.charAt(i) != SPACING_CHAR) {
s.insert(i, String.valueOf(SPACING_CHAR));
}
}
}
}
}
Works well with an appropriate PasswordTransformationMethod implementation to mask CC digits.

If you are using Kotlin, this can be helpful:
class CreditCardTextFormatter(
private var separator: String = " - ",
private var divider: Int = 5
) : TextWatcher {
override fun afterTextChanged(s: Editable?) {
if (s == null) {
return
}
val oldString = s.toString()
val newString = getNewString(oldString)
if (newString != oldString) {
s.replace(0, oldString.length, getNewString(oldString))
}
}
private fun getNewString(value: String): String {
var newString = value.replace(separator, "")
var divider = this.divider
while (newString.length >= divider) {
newString = newString.substring(0, divider - 1) + this.separator + newString.substring(divider - 1)
divider += this.divider + separator.length - 1
}
return newString
}
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
}
The XML:
<EditText
android:id="#+id/etCardNumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:digits="0123456789- "
android:inputType="number"
android:hint="____ - ____ - ____ - ____"
android:maxLength="25" />
And how to use it:
etCardNumber.addTextChangedListener(CreditCardTextFormatter())

I think that my solution can work well whatever middle text operation or copy-paste operation.
Please see code as below,
class BankNumberTextWatcher implements TextWatcher {
private int previousCodeLen = 0;
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
if (s.length() > 0) {
String numbersOnly = s.toString().replaceAll("[^0-9]", "");
// current code pattern miss-match, then handle cursor position and format the code
handleEditInput(numbersOnly);
} else {
previousCodeLen = 0;
}
}
/**
* Handle EditText input process for credit card including insert, delete during middle position,
* end position or copy-paste controller
*
* #param numbersOnly the pure number without non-digital characters
*/
private void handleEditInput(final String numbersOnly) {
String code = formatNumbersAsCode(numbersOnly);
int cursorStart = etBankCardNumber.getSelectionStart();
etBankCardNumber.removeTextChangedListener(this);
etBankCardNumber.setText(code);
int codeLen = code.length();
if (cursorStart != codeLen) {
// middle-string operation
if (cursorStart > 0 && cursorStart % 5 == 0) {
if (codeLen > previousCodeLen) {
// insert, move cursor to next
cursorStart++;
} else if (codeLen < previousCodeLen) {
// delete, move cursor to previous
cursorStart--;
}
}
etBankCardNumber.setSelection(cursorStart);
} else {
// end-string operation
etBankCardNumber.setSelection(codeLen);
}
etBankCardNumber.addTextChangedListener(this);
previousCodeLen = codeLen;
}
/**
* formats credit code like 1234 1234 5123 1234
*
* #param s
* #return
*/
public String formatNumbersAsCode(CharSequence s) {
if (TextUtils.isEmpty(s)) {
return "";
}
int len = s.length();
StringBuilder tmp = new StringBuilder();
for (int i = 0; i < len; ++i) {
tmp.append(s.charAt(i));
if ((i + 1) % 4 == 0 && (i + 1) != len) {
tmp.append(" ");
}
}
return tmp.toString();
}
}
Makes inputType to number for EditText to avoid other characters in the layout file.
Hope that be helpful for you.

Please look at this project . Android form edit text is an extension of EditText that brings data validation facilities to the edittext

After searching a lot and not getting any satisfactory answer to meet my needs, I ended up writing my own function.
Here is an example to format entered credit card details based on the type of card being entered. Currently it takes care of Visa, MasterCard and American Express for the purpose of formatting.
editTxtCardNumber.addTextChangedListener(new TextWatcher() {
private boolean spaceDeleted;
#Override
public void onTextChanged(CharSequence s, int arg1, int arg2,
int arg3) {
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
CharSequence charDeleted = s.subSequence(start, start + count);
spaceDeleted = " ".equals(charDeleted.toString());
}
#Override
public void afterTextChanged(Editable editable) {
if(editTxtCardNumber.getText().length() > 0 && editTxtCardNumber.getText().charAt(0) == '3') {
editTxtCardNumber.setFilters(new InputFilter[] { new InputFilter.LengthFilter(Constants.MAX_LENGTH_CARD_NUMBER_AMEX) });
editTxtCardNumber.removeTextChangedListener(this);
int cursorPosition = editTxtCardNumber.getSelectionStart();
String withSpaces = formatTextAmEx(editable);
editTxtCardNumber.setText(withSpaces);
editTxtCardNumber.setSelection(cursorPosition + (withSpaces.length() - editable.length()));
if (spaceDeleted) {
editTxtCardNumber.setSelection(editTxtCardNumber.getSelectionStart() - 1);
spaceDeleted = false;
}
editTxtCardNumber.addTextChangedListener(this);
} else if(editTxtCardNumber.getText().length() > 0
&& (editTxtCardNumber.getText().charAt(0) == '4' || editTxtCardNumber.getText().charAt(0) == '5')) {
editTxtCardNumber.setFilters(new InputFilter[] { new InputFilter.LengthFilter(Constants.MAX_LENGTH_CARD_NUMBER_VISA_MASTERCARD) });
editTxtCardNumber.removeTextChangedListener(this);
int cursorPosition = editTxtCardNumber.getSelectionStart();
String withSpaces = formatTextVisaMasterCard(editable);
editTxtCardNumber.setText(withSpaces);
editTxtCardNumber.setSelection(cursorPosition + (withSpaces.length() - editable.length()));
if (spaceDeleted) {
editTxtCardNumber.setSelection(editTxtCardNumber.getSelectionStart() - 1);
spaceDeleted = false;
}
editTxtCardNumber.addTextChangedListener(this);
} else {
editTxtCardNumber.setFilters(new InputFilter[] { new InputFilter.LengthFilter(Constants.MAX_LENGTH_CARD_NUMBER_VISA_MASTERCARD) });
editTxtCardNumber.removeTextChangedListener(this);
int cursorPosition = editTxtCardNumber.getSelectionStart();
String withSpaces = formatTextVisaMasterCard(editable);
editTxtCardNumber.setText(withSpaces);
editTxtCardNumber.setSelection(cursorPosition + (withSpaces.length() - editable.length()));
if (spaceDeleted) {
editTxtCardNumber.setSelection(editTxtCardNumber.getSelectionStart() - 1);
spaceDeleted = false;
}
editTxtCardNumber.addTextChangedListener(this);
}
}
});
private String formatTextVisaMasterCard(CharSequence text)
{
StringBuilder formatted = new StringBuilder();
int count = 0;
for (int i = 0; i < text.length(); ++i)
{
if (Character.isDigit(text.charAt(i)))
{
if (count % 4 == 0 && count > 0)
formatted.append(" ");
formatted.append(text.charAt(i));
++count;
}
}
return formatted.toString();
}
private String formatTextAmEx(CharSequence text)
{
StringBuilder formatted = new StringBuilder();
int count = 0;
for (int i = 0; i < text.length(); ++i)
{
if (Character.isDigit(text.charAt(i)))
{
if (count > 0 && ((count == 4) || (count == 10))) {
formatted.append(" ");
}
formatted.append(text.charAt(i));
++count;
}
}
return formatted.toString();
}
Other than formatting spaces, I also applied checks to make sure that card number doesn't exceed their maximum limit and user gets notified that he has entered all the digits by performing a change in font when the maximum limit is reached. Here is the function to perform the above mentioned operation.
public void checkCardNoEnteredCorrectly() {
if(editTxtCardNumber.getText().length() > 0 && editTxtCardNumber.getText().charAt(0) == '3') {
if(editTxtCardNumber.getText().length() == Constants.MAX_LENGTH_CARD_NUMBER_AMEX) {
editTxtCardNumber.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.amex), null, null, null);
} else {
editTxtCardNumber.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.amex), null, null, null);
}
} else if(editTxtCardNumber.getText().length() > 0 && editTxtCardNumber.getText().charAt(0) == '4') {
if(editTxtCardNumber.getText().length() == Constants.MAX_LENGTH_CARD_NUMBER_VISA_MASTERCARD) {
editTxtCardNumber.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.visa), null, null, null);
} else {
editTxtCardNumber.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.visa), null, null, null);
}
} else if(editTxtCardNumber.getText().length() > 0 && editTxtCardNumber.getText().charAt(0) == '5') {
if(editTxtCardNumber.getText().length() == Constants.MAX_LENGTH_CARD_NUMBER_VISA_MASTERCARD) {
editTxtCardNumber.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.master_card), null, null, null);
} else {
editTxtCardNumber.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.master_card), null, null, null);
}
} else {
editTxtCardNumber.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.credit_card_number), null, null, null);
}
}
Note: The declarations made in Constants.java is as follows:
public static final int MAX_LENGTH_CARD_NUMBER_VISA_MASTERCARD = 19;
public static final int MAX_LENGTH_CARD_NUMBER_AMEX = 17;
Hope it helps!

You may have figured it out already, but here is what I did. The only method I had to override was AfterTextChanged.
Check if the form of the credit card is already valid, base case to prevent infinite recursion
If the form is not valid, remove all whitespace, and copy over into another string, inserting white space where appropriate.
Then simply replace the editable with your new string.
If you need code for a particular step, feel free to ask.
And Preethi, the reason you can't delete spaces is because you can't change text in the onTextChanged callback. From the developer site:
public abstract void onTextChanged (CharSequence s, int start, int before, int count)
Added in API level 1
This method is called to notify you that, within s, the count characters beginning at start have just replaced old text that had length before. It is an error to attempt to make changes to s from this callback.

int keyDel;
String a;
String a0;
int isAppent = 0;
final String ch = " ";
private void initListner() {
txtCreditNumber.addTextChangedListener(new TextWatcher() {
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
boolean flag = true;
if (s.length() > 19) {
txtCreditNumber.setText(a0);
txtCreditNumber.setSelection(txtCreditNumber.getText().length());
return;
}
String eachBlock[] = s.toString().split(ch);
for(int i = 0; i < eachBlock.length; i++) {
if (eachBlock[i].length() > 4) {
flag = false;
}
}
if (a0.length() > s.toString().length()) {
keyDel = 1;
}
if (flag) {
if (keyDel == 0) {
if (((txtCreditNumber.getText().length() + 1) % 5) == 0) {
if (s.toString().split(ch).length <= 3) {
isAppent = 1;
txtCreditNumber.setText(s + ch);
isAppent = 0;
txtCreditNumber.setSelection(txtCreditNumber.getText().length());
a = txtCreditNumber.getText().toString();
return;
}
}
if (isAppent == 0) {
String str = s.toString();
if (str.lastIndexOf(ch) == str.length() - 1) {
str = str.substring(0, str.lastIndexOf(ch));
keyDel = 1;
txtCreditNumber.setText(str);
keyDel = 0;
txtCreditNumber.setSelection(txtCreditNumber.getText().length());
a = txtCreditNumber.getText().toString();
return;
}
}
}
else {
String str = s.toString();
if (str.length() > 0 && str.lastIndexOf(ch) == str.length() - 1) {
str = str.substring(0, str.lastIndexOf(ch));
keyDel = 1;
txtCreditNumber.setText(str);
keyDel = 0;
txtCreditNumber.setSelection(txtCreditNumber.getText().length());
a = txtCreditNumber.getText().toString();
return;
}
else {
a = txtCreditNumber.getText().toString();
keyDel = 0;
}
}
}
else {
String str = s.toString();
str = str.substring(0, str.length() - 1) + ch + str.substring(str.length() - 1, str.length());
a = str;
txtCreditNumber.setText(a);
txtCreditNumber.setSelection(txtCreditNumber.getText().length());
}
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// TODO Auto-generated method stub
a0 = s.toString();
}
#Override
public void afterTextChanged(Editable s) {
}
});
}

Here is an example that use all the function appropriately to make a decision.
The code might be a bit longer, but it will be faster as it mainly use the function given values (start, before, count ...).
This example add "-" every 4 digits, and delete them as well, when user use backspace.
as well, make sure the cursor will be at the end.
public class TextWatcherImplement implements TextWatcher {
private EditText creditCard;
private String beforeText, currentText;
private boolean noAction, addStroke, dontAddChar, deleteStroke;
public TextWatcherImplement(EditText creditCard) {
// TODO Auto-generated constructor stub
this.creditCard = creditCard;
noAction = false;
addStroke = false;
dontAddChar = false;
deleteStroke = false;
}
/* here I save the previous string if the max character had achieved */
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// TODO Auto-generated method stub
Log.i("TextWatcherImplement", "beforeTextChanged start==" + String.valueOf(start) + " count==" + String.valueOf(count) + " after==" + String.valueOf(after));
if (start >= 19)
beforeText = s.toString();
}
/* here I check were we add a character, or delete one.
if we add character and it is time to add a stroke, then I flag it -> addStroke
if we delete a character and it time to delete a stroke, I flag it -> deleteStroke
if we are in max character for the credit card, don't add char -> dontAddChar
*/
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
Log.i("TextWatcherImplement", "onTextChanged start==" + String.valueOf(start) + " before==" + String.valueOf(before) + " count==" + String.valueOf(count) + " noAction ==" + String.valueOf(noAction));
if ( (before < count) && !noAction ) {
if ( (start == 3) || (start == 8) || (start == 13) ) {
currentText = s.toString();
addStroke = true;
} else if (start >= 19) {
currentText = s.toString();
dontAddChar = true;
}
} else {
if ( (start == 4) || (start == 9) || (start == 14) ) { //(start == 5) || (start == 10) || (start == 15)
currentText = s.toString();
deleteStroke = true;
}
}
}
/* noAction flag is when we change the text, the interface is being called again.
the NoAction flag will prevent any action, and prevent a ongoing loop */
#Override
public void afterTextChanged(Editable stext) {
// TODO Auto-generated method stub
if (addStroke) {
Log.i("TextWatcherImplement", "afterTextChanged String == " + stext + " beforeText == " + beforeText + " currentText == " + currentText);
noAction = true;
addStroke = false;
creditCard.setText(currentText + "-");
} else if (dontAddChar) {
dontAddChar = false;
noAction = true;
creditCard.setText(beforeText);
} else if (deleteStroke) {
deleteStroke = false;
noAction = true;
currentText = currentText.substring(0, currentText.length() - 1);
creditCard.setText(currentText);
} else {
noAction = false;
creditCard.setSelection(creditCard.getText().length()); // set cursor at the end of the line.
}
}
}

Here's my solution. My comments should suffice enough information for an Android developer to understand what's happening but if you have any questions then please feel free to ask and I'll answer to the best of my knowledge.
private KeyEvent keyEvent;
final TextWatcher cardNumberWatcher = new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence charSequence, int start, int before, int count) {
// NOT USING
}
#Override
public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
// NOT USING
}
#Override
public void afterTextChanged(Editable editable) {
String cardNumbersOnly = editable.toString().replace("-", "");
/**
* #PARAM keyEvent
* This gets called upon deleting a character so you must keep a
* flag to ensures this gets skipped during character deletion
*/
if (cardNumbersOnly.length() >= 4 && keyEvent == null) {
formatCreditCardTextAndImage(this);
}
keyEvent = null;
}
};
cardNumberEditText.addTextChangedListener(cardNumberWatcher);
/**
* #LISTENER
* Must keep track of when the backspace event has been fired to ensure
* that the delimiter character and the character before it is deleted
* consecutively to avoid the user from having to press backspace twice
*/
cardNumberEditText.setOnKeyListener(new View.OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() != KeyEvent.ACTION_UP) {
// Hold reference of key event for checking within the text watcher
keyEvent = event;
String cardNumberString = cardNumberEditText.getText().toString();
if (keyCode == event.KEYCODE_DEL) {
if (cardNumberString.substring(cardNumberString.length() - 1).equals("-")) {
// Remove listener to avoid infinite looping
cardNumberEditText.removeTextChangedListener(cardNumberWatcher);
// Remove hyphen and character before it
cardNumberEditText.setText(cardNumberString.substring(0, cardNumberString.length() - 1));
// Set the cursor back to the end of the text
cardNumberEditText.setSelection(cardNumberEditText.getText().length());
// Add the listener back
cardNumberEditText.addTextChangedListener(cardNumberWatcher);
}
else if (cardNumberString.length() < 2) {
cardNumberBrandImageView.setImageDrawable(null);
cardNumberBrandImageView.setVisibility(View.INVISIBLE);
}
}
}
return false;
}
});
}
private void formatCreditCardTextAndImage (TextWatcher textWatcher) {
// Remove to avoid infinite looping
cardNumberEditText.removeTextChangedListener(textWatcher);
String cardNumberString = cardNumberEditText.getText().toString();
/**
* #CONDITION
* Append delimiter after every fourth character excluding the 16th
*/
if ((cardNumberString.length() + 1) % 5 == 0 && !cardNumberString.substring(cardNumberString.length() - 1).equals("-")) {
cardNumberEditText.setText(cardNumberString + "-");
}
// Set the cursor back to the end of the text
cardNumberEditText.setSelection(cardNumberEditText.getText().length());
cardNumberEditText.addTextChangedListener(textWatcher);
/**
* #CardBrand
* Is an enum utility class that checks the card numbers
* against regular expressions to determine the brand and updates the UI
*/
if (cardNumberString.length() == 2) {
switch (CardBrand.detect(cardNumberEditText.getText().toString())) {
case VISA:
cardNumberBrandImageView.setImageResource(R.drawable.visa);
cardNumberBrandImageView.setVisibility(View.VISIBLE);
card.setBrand(Brand.Visa);
break;
case MASTERCARD:
cardNumberBrandImageView.setImageResource(R.drawable.mastercard);
cardNumberBrandImageView.setVisibility(View.VISIBLE);
card.setBrand(Brand.MasterCard);
break;
case DISCOVER:
cardNumberBrandImageView.setImageResource(R.drawable.discover);
cardNumberBrandImageView.setVisibility(View.VISIBLE);
card.setBrand(Brand.Discover);
break;
case AMERICAN_EXPRESS:
cardNumberBrandImageView.setImageResource(R.drawable.americanexpress);
cardNumberBrandImageView.setVisibility(View.VISIBLE);
card.setBrand(Brand.AmericanExpress);
break;
case UNKNOWN:
cardNumberBrandImageView.setImageDrawable(null);
cardNumberBrandImageView.setVisibility(View.INVISIBLE);
card.setBrand(null);
break;
}
}
}

Here's a simple and easily customizable solution using the TextWatcher class. It may be assigned to your EditText using the addTextChangedListener() method.
new TextWatcher() {
/** Formats the Field to display user-friendly separation of the input values. */
#Override public final void afterTextChanged(final Editable pEditable) {
// Declare the separator.
final char lSeparator = '-';
// Declare the length of separated text. i.e. (XXXX-XXXX-XXXX)
final int lSeparationSize = 4;
// Declare the count; tracks the number of allowed characters in a row.
int lCount = 0;
// Iterate the Characters.
for(int i = 0; i < pEditable.length(); i++) {
// Fetch the current character.
final char c = pEditable.charAt(i);
// Is it a usual character. Here, we permit alphanumerics only.
final boolean lIsExpected = (Character.isDigit(c) || Character.isLetter(c)) && (c != lSeparator);
// Is the character expected?
if(lIsExpected) {
// Increase the count.
lCount++;
}
else {
// Is it a separator?
if(c == lSeparator) {
// Reset the count.
lCount = 0;
// Continue the iteration.
continue;
}
}
// Has the count been exceeded? Is there more text coming?
if(lCount >= (lSeparationSize + 1) && (i < pEditable.length())) {
// Reset the count.
lCount = 0;
// Insert the separator.
pEditable.insert(i, Character.toString(lSeparator));
// Increase the iteration count.
i++;
}
}
}
/** Unused overrides. */
#Override public final void beforeTextChanged(final CharSequence pCharSequence, final int pStart, final int pCount, final int pAfter) { }
#Override public final void onTextChanged(final CharSequence pCharSequence, final int pStart, final int pBefore, final int pCount) { }
}
Alternatively, here is a much cleaner implementation based on epool's implementation.
public final class TextGroupFormattingListener implements TextWatcher {
/* Member Variables. */
private final int mGroupLength;
private final String mSeparator;
private String mSource;
/** Constructor. */
public TextGroupFormattingListener(final String pSeparator, final int pGroupLength) {
// Initialize Member Variables.
this.mSeparator = pSeparator;
this.mGroupLength = pGroupLength;
this.mSource = "";
}
/** Formats the Field to display user-friendly separation of the input values. */
#Override public final void afterTextChanged(final Editable pEditable) {
// Fetch the Source.
String lSource = pEditable.toString();
// Has the text changed?
if (!this.getSource().equals(lSource)) {
// Remove all of the existing Separators.
lSource = lSource.replace(this.getSeparator(), "");
// Allocate a StringBuilder.
StringBuilder lStringBuilder = new StringBuilder();
// Iterate across the Source String, which contains the raw user input.
for(int i = 0; i < lSource.length(); i++) {
// Have we exceeded the GroupLength?
if(i > 0 && i % this.getGroupLength() == 0) {
// Append the separator.
lStringBuilder.append(this.getSeparator());
}
// Append the user's character data.
lStringBuilder.append(lSource.charAt(i));
}
// Track changes to the Source.
this.setSource(lStringBuilder.toString());
// Replace the contents of the Editable with this new String.
pEditable.replace(0, pEditable.length(), this.getSource());
}
}
/** Unused overrides. */
#Override public final void beforeTextChanged(final CharSequence pCharSequence, final int pStart, final int pCount, final int pAfter) { }
#Override public final void onTextChanged(final CharSequence pCharSequence, final int pStart, final int pBefore, final int pCount) { }
public final int getGroupLength() {
return this.mGroupLength;
}
public final String getSeparator() {
return this.mSeparator;
}
private final void setSource(final String pSource) {
this.mSource = pSource;
}
private final String getSource() {
return this.mSource;
}
}

None of above answers is perfect for me. I created one that solves the start-string/end-string/mid-string issues. Copy & Paste should also work fine. This supports Mastercard, Visa and Amex. You can change the separator. If you don't need payment method type just remove it. It is Kotlin though. The idea is simple. Everytime when text changed I remove all separators and re-added them base on the format. The solves the issue start-string/mid-string issues. Then the only problem is that you need to work out the the right text position after separators added.
fun addCreditCardNumberTxtWatcher(et: EditText, separator: Char, paymentMethodType: PaymentMethodType): TextWatcher {
val tw = object : TextWatcher {
var mBlock = false
override fun afterTextChanged(s: Editable) {
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
Logger.d("_debug", "s: $s, start: $start, count: $count, after $after")
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
if (mBlock)
return
var lastPos = et.selectionStart
val oldStr = et.text.toString().replace(separator.toString(), "", false)
var newFormattedStr = ""
if (before > 0) {
if (lastPos > 0 && et.text.toString()[lastPos - 1] == separator) lastPos--
}
Logger.d("_debug", "lastPos: $lastPos, s: $s, start: $start, before: $before, count $count")
mBlock = true
oldStr.forEachIndexed { i, c ->
when (paymentMethodType) {
PaymentMethodType.MASTERCARD, PaymentMethodType.VISA -> {
if (i > 0 && i % 4 == 0) {
newFormattedStr += separator
}
}
PaymentMethodType.AMERICAN_EXPRESS -> {
if (i == 4 || i == 10 || i == 15) {
newFormattedStr += separator
}
}
}
newFormattedStr += c
}
et.setText(newFormattedStr)
if (before == 0) {
if (et.text.toString()[lastPos - 1] == separator) lastPos++
}
et.setSelection(lastPos)
mBlock = false
}
}
et.addTextChangedListener(tw)
return tw
}

This solution was implemented for IBAN's but the principle is the same, I tried to correct all the main problems in the answers above, if you find an error feel free to say it, thank you.
Set the EditText and restrict the characters that can be used:
private void setEditTextIBAN(View view) {
editTextIBAN = (EditText) view.findViewById(R.id.client_iban);
editTextIBAN.setKeyListener(
DigitsKeyListener.getInstance("ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 "));
editTextIBAN.addTextChangedListener(new IBANTextWatcher());
}
This is the TextWatcher:
private class IBANTextWatcher implements TextWatcher {
// means divider position is every 5th symbol
private static final int DIVIDER_MODULO = 5;
private static final int GROUP_SIZE = DIVIDER_MODULO - 1;
private static final char DIVIDER = ' ';
private static final String STRING_DIVIDER = " ";
private String previousText = "";
private int deleteLength;
private int insertLength;
private int start;
private String regexIBAN = "(\\w{" + GROUP_SIZE + "}" + DIVIDER +
")*\\w{1," + GROUP_SIZE + "}";
private Pattern patternIBAN = Pattern.compile(regexIBAN);
#Override
public void beforeTextChanged(final CharSequence s, final int start, final int count, final int after) {
this.previousText = s.toString();
this.deleteLength = count;
this.insertLength = after;
this.start = start;
}
#Override
public void onTextChanged(final CharSequence s, final int start, final int before, final int count) {
}
#Override
public void afterTextChanged(final Editable s) {
String originalString = s.toString();
if (!previousText.equals(originalString) &&
!isInputCorrect(originalString)) {
String newString = previousText.substring(0, start);
int cursor = start;
if (deleteLength > 0 && s.length() > 0 &&
(previousText.charAt(start) == DIVIDER ||
start == s.length())) {
newString = previousText.substring(0, start - 1);
--cursor;
}
if (insertLength > 0) {
newString += originalString.substring(start, start + insertLength);
newString = buildCorrectInput(newString);
cursor = newString.length();
}
newString += previousText.substring(start + deleteLength);
s.replace(0, s.length(), buildCorrectInput(newString));
editTextIBAN.setSelection(cursor);
}
}
/**
* Check if String has the white spaces in the correct positions, meaning
* if we have the String "123456789" and there should exist a white space
* every 4 characters then the correct String should be "1234 5678 9".
*
* #param s String to be evaluated
* #return true if string s is written correctly
*/
private boolean isInputCorrect(String s) {
Matcher matcherDot = patternIBAN.matcher(s);
return matcherDot.matches();
}
/**
* Puts the white spaces in the correct positions,
* see the example in {#link IBANTextWatcher#isInputCorrect(String)}
* to understand the correct positions.
*
* #param s String to be corrected.
* #return String corrected.
*/
private String buildCorrectInput(String s) {
StringBuilder sbs = new StringBuilder(
s.replaceAll(STRING_DIVIDER, ""));
// Insert the divider in the correct positions
for (int i = GROUP_SIZE; i < sbs.length(); i += DIVIDER_MODULO) {
sbs.insert(i, DIVIDER);
}
return sbs.toString();
}
}

If anyone still looking for answer,
Try the format-edit-text library for auto-formatting text in one line of code. This library uses dash(es) to define the format of the input.
editText.setFormat("any (dash) format");
How to use
add format-edit-text library dependency in app/build.gradle
implementation 'com.androidwidgets:formatedittext:0.2.0'
Add FormatEditText view in activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:focusableInTouchMode="true"
android:focusable="true">
<com.androidwidgets.formatedittext.widgets.FormatEditText
android:id="#+id/edit_text_1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:imeOptions="actionSend"
android:inputType="number"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Set credit-card format to FormatEditText view in MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final FormatEditText editText1 = findViewById(R.id.edit_text_1);
editText1.setFormat("---- ---- ---- ----");
}
}
This will produce the below output
PS: Make sure parameter inputType is added to the FormatEditText view in the layout file.
android:inputType="number"

I know this question is a bit old but I need an implemantation of this for IBAN's and not satisfied with the given answers. So I wrote some code for this. But it takes the "pattern" and "divider" as parameters so it can be use for credit card numbers too.
This is the extended text watcher class.
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
public class IbanTextWatcher implements TextWatcher {
private int[] pattern;
private String divider;
private String before;
private EditText field;
private boolean dividerDeleted;
public IbanTextWatcher(int[] pattern, String divider, EditText field) {
this.divider = divider;
this.pattern = pattern;
this.field = field;
}
#Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
before = charSequence.toString();
if (!String.valueOf(charSequence).equals("") && charSequence.length() > i) {
if (String.valueOf(before.charAt(i)).equals(getDivider())) {
dividerDeleted = true;
} else {
dividerDeleted = false;
}
}
}
#Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
#Override
public void afterTextChanged(Editable editable) {
String input = editable.toString().replaceAll("\\s", "");
StringBuilder output = new StringBuilder();
boolean error = false;
int currentIndex = 0;
int cursorPosition = getField().getSelectionStart();
int lengthBefore;
int currentPatternMember = 0;
//prevent user to delete the divider
if (dividerDeleted && cursorPosition != getField().getText().length()) {
getField().setText(getBefore());
getField().setSelection(cursorPosition + 1);
return;
} else if (input.equals(getBefore().replaceAll("\\s", ""))) {
return;
}
for (int i = 0; i < getPattern().length; i++) {
error = false;
currentPatternMember = getPattern()[i];
try {
output.append(input.substring(currentIndex, currentIndex + currentPatternMember));
} catch (StringIndexOutOfBoundsException e) {
error = true;
}
if (!error) {
if (i != getPattern().length - 1) {
output.append(getDivider());
}
currentIndex += currentPatternMember;
} else {
break;
}
}
if (error) {
output.append(input.substring(currentIndex, input.length()));
}
cursorPosition = getField().getSelectionStart();
lengthBefore = getBefore().length();
getField().setText(output.toString());
if (cursorPosition != lengthBefore && cursorPosition != lengthBefore + 1) {
getField().setSelection(cursorPosition);
} else {
getField().setSelection(getField().getText().length());
}
}
public int[] getPattern() {
return pattern;
}
public String getDivider() {
return divider;
}
public String getBefore() {
return before;
}
public EditText getField() {
return field;
}
}
And this is how I use it:
int[] pattern = {2,4,4,4,4,4,2}; //
iban.addTextChangedListener(new IbanTextWatcher(pattern, " ", iban)); //here iban is my edittext field
By the way, I set the max length of the field in xml.

In your layout:
<android.support.design.widget.TextInputEditText
android:id="#+id/et_credit_card_number"
android:digits=" 1234567890"
android:inputType="number"
android:maxLength="19"/>
Here the TextWachter which sets a space on every 4 digits in a 16 number credit card.
class CreditCardFormatWatcher : TextWatcherAdapter() {
override fun afterTextChanged(s: Editable?) {
if (s == null || s.isEmpty()) return
s.forEachIndexed { index, c ->
val spaceIndex = index == 4 || index == 9 || index == 14
when {
!spaceIndex && !c.isDigit() -> s.delete(index, index + 1)
spaceIndex && !c.isWhitespace() -> s.insert(index, " ")
}
}
if (s.last().isWhitespace())
s.delete(s.length - 1, s.length)
}
}

private class TextWatcherIBAN implements TextWatcher {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
textInputEditText.removeTextChangedListener(this);
formatIBANEditText(textInputEditText);
textInputEditText.addTextChangedListener(this);
}
}
public void formatIBANEditText(TextInputEditText editText) {
String decimalAmount = editText.getText().toString();
int selection = editText.getSelectionEnd() == decimalAmount.length() ? -1 : editText.getSelectionEnd();
decimalAmount = formatIBAN(decimalAmount);
editText.setText(decimalAmount);
if (selection != -1) {
editText.setSelection(selection);
} else {
editText.setSelection(decimalAmount.length());
}
}
public String formatIBAN(String text) {
return formatterIBAN(new StringBuilder(text));
}
private String formatterIBAN(StringBuilder text) {
int group = text.toString().length() / 5;
int spaceCount = getSpaceCount(text);
if (spaceCount < group) {
return formatterIBAN(text.insert(4 + 5 * spaceCount, space));
} else {
return text.toString();
}
}
private int getSpaceCount(StringBuilder text) {
int spaceCount = 0;
for (int index = 0; index < text.length(); index++) {
if (text.charAt(index) == space.charAt(0)) {
spaceCount++;
}
}
return spaceCount;
}
textInputEditText.addTextChangedListener(new TextWatcherIBAN());

class XYZ : TextWatcher {
private val formatSymbols = DecimalFormatSymbols(Locale.getDefault())
private lateinit var formatter: DecimalFormat
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
.
.
formatSymbols.groupingSeparator = ' '
formatter = DecimalFormat("####,####", formatSymbols)
.
.
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
editText.addTextChangedListener(this)
}
override fun afterTextChanged(s: Editable?) {
if (editText.error != null) {
editText.error = null
}
editText.removeTextChangedListener(this)
try {
var originalString = s.toString()
if (originalString.contains(" ")) {
originalString = originalString.replace(" ", "", true)
}
val longVal: Long? = originalString.toLong()
val formattedString = formatter.format(longVal)
editText.setText(formattedString)
editText.setSelection(editText.text.length)
} catch (error: NumberFormatException) {
// Print Error Or Do Whatever you want.
}
editText.addTextChangedListener(this)
}
}

This is my implementation base on Igor Tyulkanov's idea, it has a small improvement that fix the cursor position problem
class CardNumbersInputWatcher(private val editText: EditText) : TextWatcher {
companion object {
private const val TOTAL_SYMBOLS = 19
private const val DIVIDER_DISTANCE = 4
private const val DIVIDER = ' '
}
override fun afterTextChanged(s: Editable) {
if (!isInputCorrect(s, TOTAL_SYMBOLS, DIVIDER_DISTANCE, DIVIDER)) {
val beforeCurPos = editText.selectionStart
val beforeLength = s.length
s.replace(0, s.length, buildCorrectString(s, TOTAL_SYMBOLS, DIVIDER_DISTANCE, DIVIDER))
if (beforeLength > TOTAL_SYMBOLS && beforeCurPos <= s.length && editText.selectionStart < beforeCurPos) {
editText.setSelection(beforeCurPos)
}
}
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) = Unit
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) = Unit
}
private fun isInputCorrect(s: Editable, totalSymbols: Int, dividerDistance: Int, divider: Char): Boolean {
if (s.length > totalSymbols) {
return false
}
return s.withIndex().all { (index, c) ->
if (index != 0 && ((index + 1) % (dividerDistance + 1) == 0)) {
// it should be divider
c == divider
} else {
c.isDigit()
}
}
}
private fun buildCorrectString(s: Editable, totalSymbols: Int, dividerDistance: Int, divider: Char): String {
return buildString {
for (c in s) {
if (length >= totalSymbols) break
if (!c.isDigit()) continue
if (length > 0 && ((length + 1) % (dividerDistance + 1)) == 0) append(divider)
append(c)
}
}
}

1. Copy and paste this class
class EditTextForCards #JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = androidx.appcompat.R.attr.editTextStyle
) : AppCompatEditText(context, attrs, defStyleAttr) {
private var mCCPatterns = SparseArray<Pattern>()
private var mSeparator: Separator = Separator.NONE
private var mDrawableGravity: Gravity? = null/*Gravity.END*/
private var isValidCard: Boolean = false
private var mCurrentDrawableResId = Card.UNKNOWN.drawableRes
val textWithoutSeparator
get() = if (mSeparator == Separator.NONE) {
text.toString()
} else {
text.toString().replace(mSeparator.toRegex(), "")
}
val isCardValid: Boolean
get() = textWithoutSeparator.length > 12 && isValidCard
val cardType: Card
get() = Card.from(mCurrentDrawableResId)
enum class Separator(private val stringValue: String) {
NONE(""), SPACES(" "), DASHES("-");
override fun toString() = stringValue
internal fun toRegex() = stringValue.toRegex()
internal val length
get() = stringValue.length
}
enum class Gravity {
START, END, LEFT, RIGHT
}
enum class Card(internal val value: Int, #field:DrawableRes internal val drawableRes: Int) {
VISA(1, R.drawable.ic_visa),
MASTERCARD(2, R.drawable.ic_mastercard),
AMEX(4, R.drawable.amex),
DISCOVER(8, R.drawable.discover),
UNKNOWN(-1, R.drawable.ic_visa);
companion object {
internal fun from(#DrawableRes drawableRes: Int): Card {
for (card in values()) {
if (card.drawableRes == drawableRes) {
return card
}
}
return UNKNOWN
}
}
}
private val textWatcher = object : TextWatcher {
override fun afterTextChanged(s: Editable?) {}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
override fun onTextChanged(
text: CharSequence,
start: Int,
lengthBefore: Int,
lengthAfter: Int
) {
val textWithoutSeparator = textWithoutSeparator
var mDrawableResId = 0
for (i in 0 until mCCPatterns.size()) {
val key = mCCPatterns.keyAt(i)
val p = mCCPatterns.get(key)
val m = p.matcher(textWithoutSeparator)
isValidCard = m.find()
if (isValidCard) {
mDrawableResId = key
break
}
}
// if (mDrawableResId != 0 && mDrawableResId != mCurrentDrawableResId) {
// mCurrentDrawableResId = mDrawableResId
// } else if (mDrawableResId == 0) {
// mCurrentDrawableResId = Card.UNKNOWN.drawableRes
// }
// addDrawable()
addSeparators()
}
}
init {
setDisabledCards()
inputType = InputType.TYPE_CLASS_PHONE
setSeparator(Separator.NONE)
// setDrawableGravity(Gravity.END)
attrs?.let { applyAttributes(it) }
addTextChangedListener(textWatcher)
}
private fun applyAttributes(attrs: AttributeSet) {
val a = context.theme.obtainStyledAttributes(
attrs,
R.styleable.EditTextForCards,
0, 0
)
try {
setSeparator(
Separator.values()[a.getInt(
R.styleable.EditTextForCards_separator,
Separator.NONE.ordinal
)]
)
setDisabledCardsInternal(a.getInt(R.styleable.EditTextForCards_disabledCards, 0))
setDrawableGravity(
Gravity.values()[a.getInt(
R.styleable.EditTextForCards_drawableGravity,
Gravity.END.ordinal
)]
)
} finally {
a.recycle()
}
}
private fun addDrawable() {
var currentDrawable = ContextCompat.getDrawable(context, mCurrentDrawableResId)
if (currentDrawable != null && error.isNullOrEmpty()) {
currentDrawable = resize(currentDrawable)
when (mDrawableGravity) {
Gravity.START -> setDrawablesRelative(start = currentDrawable)
Gravity.RIGHT -> setDrawables(right = currentDrawable)
Gravity.LEFT -> setDrawables(left = currentDrawable)
else -> setDrawablesRelative(end = currentDrawable)
}
}
}
private fun addSeparators() {
val text = text.toString()
if (mSeparator != Separator.NONE) {
if (text.length > 4 && !text.matches("(?:[0-9]{4}$mSeparator)+[0-9]{1,4}".toRegex())) {
val sp = StringBuilder()
val caretPosition = selectionEnd
val segments = splitString(text.replace(mSeparator.toRegex(), ""))
for (segment in segments) {
sp.append(segment).append(mSeparator)
}
setText("")
append(sp.delete(sp.length - mSeparator.length, sp.length).toString())
if (caretPosition < text.length)
setSelection(caretPosition)
}
}
}
private fun removeSeparators() {
var text = text.toString()
text = text.replace(" ".toRegex(), "").replace("-".toRegex(), "")
setText("")
append(text)
}
private fun splitString(s: String): Array<String?> {
val arrayLength = ceil(s.length / 4.toDouble()).toInt()
val result = arrayOfNulls<String>(arrayLength)
var j = 0
val lastIndex = result.size - 1
for (i in 0 until lastIndex) {
result[i] = s.substring(j, j + 4)
j += 4
}
result[lastIndex] = s.substring(j)
return result
}
/*#Deprecated("Please use the method that accepts a Separator enum instead.", ReplaceWith("this.setSeparator(Separator.)"))
fun setSeparator(#IntRange(from = 0, to = 2) separator: Int) {
require(!(separator > 2 || separator < 0)) {
"The separator has to be one of the following:" +
"NO_SEPARATOR." +
"SPACES_SEPARATOR." +
"DASHES_SEPARATOR."
}
setSeparator(Separator.values()[separator])
}*/
/**
* Use this method to set the separator style.
* The default separator is [Separator.NONE].
*
* #param separator the style of the separator.
*/
fun setSeparator(separator: Separator) {
mSeparator = separator
if (mSeparator != Separator.NONE) {
filters = arrayOf<InputFilter>(InputFilter.LengthFilter(23))
keyListener = DigitsKeyListener.getInstance("0123456789$mSeparator")
addSeparators()
} else {
filters = arrayOf<InputFilter>(InputFilter.LengthFilter(19))
keyListener = DigitsKeyListener.getInstance("0123456789")
removeSeparators()
}
}
/**
* Use this method to set the location of the card drawable.
* The default gravity is [Gravity.END].
*
* #param gravity the drawable location.
*/
fun setDrawableGravity(gravity: Gravity) {
mDrawableGravity = gravity
addDrawable()
}
private fun setDisabledCardsInternal(disabledCards: Int) {
val cards = ArrayList<Card>()
if (containsFlag(disabledCards, Card.VISA.value)) {
cards.add(Card.VISA)
}
if (containsFlag(disabledCards, Card.MASTERCARD.value)) {
cards.add(Card.MASTERCARD)
}
/*if (containsFlag(disabledCards, Card.AMEX.value)) {
cards.add(Card.AMEX)
}
if (containsFlag(disabledCards, Card.DISCOVER.value)) {
cards.add(Card.DISCOVER)
}*/
setDisabledCards(*cards.toTypedArray())
}
#Deprecated(
"Please use the method that accepts an array of Cards instead.",
ReplaceWith("this.setDisabledCards(cards)")
)
fun setDisabledCards(disabledCards: Int) {
setDisabledCardsInternal(disabledCards)
}
/**
* Use this method to set which cards are disabled.
* By default all supported cards are enabled.
*
* #param cards the cards to be disabled.
*/
fun setDisabledCards(vararg cards: Card) {
var disabledCards = 0
for (card in cards) {
disabledCards = disabledCards or card.value
}
mCCPatterns.clear()
if (!containsFlag(disabledCards, Card.VISA.value)) {
mCCPatterns.put(Card.VISA.drawableRes, Pattern.compile("^4[0-9]{1,12}(?:[0-9]{6})?$"))
}
if (!containsFlag(disabledCards, Card.MASTERCARD.value)) {
mCCPatterns.put(Card.MASTERCARD.drawableRes, Pattern.compile("^5[1-5][0-9]{0,14}$"))
}
/*if (!containsFlag(disabledCards, Card.AMEX.value)) {
mCCPatterns.put(Card.AMEX.drawableRes, Pattern.compile("^3[47][0-9]{0,13}$"))
}
if (!containsFlag(disabledCards, Card.DISCOVER.value)) {
mCCPatterns.put(Card.DISCOVER.drawableRes, Pattern.compile("^6(?:011|5[0-9]{1,2})[0-9]{0,12}$"))
}*/
textWatcher.onTextChanged("", 0, 0, 0)
}
private fun containsFlag(flagSet: Int, flag: Int): Boolean {
return flagSet or flag == flagSet
}
override fun onDraw(canvas: Canvas) {
super.onDraw(canvas)
var noDrawablesVisible = true
for (drawable in compoundDrawables) {
if (drawable != null) {
noDrawablesVisible = false
break
}
}
if (noDrawablesVisible) {
addDrawable()
}
}
private fun resize(image: Drawable) =
when (val height = measuredHeight - (paddingTop + paddingBottom)) {
in 1 until image.intrinsicHeight -> {
val bitmap = (image as BitmapDrawable).bitmap
val ratio = image.getIntrinsicWidth().toFloat() / image.intrinsicHeight.toFloat()
val resizedBitmap =
Bitmap.createScaledBitmap(bitmap, (height * ratio).toInt(), height, false)
resizedBitmap.density = Bitmap.DENSITY_NONE
BitmapDrawable(resources, resizedBitmap)
}
in Int.MIN_VALUE..0 -> null
else -> image
}
private fun setDrawablesRelative(
start: Drawable? = null,
top: Drawable? = null,
end: Drawable? = null,
bottom: Drawable? = null
) =
/*TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(this, start, top, end, bottom)*/
TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(this, null, null, null, null)
private fun setDrawables(
left: Drawable? = null,
top: Drawable? = null,
right: Drawable? = null,
bottom: Drawable? = null
) =
/*setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom)*/
setCompoundDrawablesWithIntrinsicBounds(null, null, null, null)
companion object {
#Deprecated("This constant has been replace with an enum.", ReplaceWith("Separator.NONE"))
const val NO_SEPARATOR = 0
#Deprecated("This constant has been replace with an enum.", ReplaceWith("Separator.SPACES"))
const val SPACES_SEPARATOR = 1
#Deprecated("This constant has been replace with an enum.", ReplaceWith("Separator.DASHES"))
const val DASHES_SEPARATOR = 2
#Deprecated("This constant has been replace with an enum.", ReplaceWith("null"))
const val NONE = 0
#Deprecated("This constant has been replace with an enum.", ReplaceWith("Card.VISA"))
const val VISA = 1
#Deprecated("This constant has been replace with an enum.", ReplaceWith("Card.MASTERCARD"))
const val MASTERCARD = 2
#Deprecated("This constant has been replace with an enum.", ReplaceWith("Card.AMEX"))
const val AMEX = 4
#Deprecated("This constant has been replace with an enum.", ReplaceWith("Card.DISCOVER"))
const val DISCOVER = 8
}
}
2. paste this style
<declare-styleable name="EditTextForCards">
<attr name="separator" format="enum">
<enum name="no_separator" value="0" />
<enum name="spaces" value="1" />
<enum name="dashes" value="2" />
</attr>
<attr name="disabledCards">
<flag name="none" value="0" />
<flag name="visa" value="1" />
<flag name="mastercard" value="2" />
<flag name="amex" value="4" />
<flag name="discover" value="8" />
</attr>
<attr name="drawableGravity">
<enum name="start" value="0" />
<enum name="end" value="1" />
<enum name="left" value="2" />
<enum name="right" value="3" />
</attr>
</declare-styleable>
3. In your layout file, use it by
<EditTextForCards
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/dp_5"
android:digits="0123456789 "
android:hint="#string/card_number"
android:padding="#dimen/dp_20"
android:textColor="#android:color/white"
android:textColorHint="#android:color/white"
android:textSize="#dimen/sp_16"
app:separator="spaces" />

benefits:
It works when you insert numbers one by one
It works when you paste all 16 character
It handles back press
It removes other characters automatically
in XML
android:digits="0123456789-"
android:maxLength="19"
android:inputType="number"
and the TextWatcher
class FourDigitCardFormatWatcher : TextWatcher {
private var current = ""
override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {
}
override fun afterTextChanged(s: Editable) {
if (s.toString() != current) {
val userInput = s.toString().replace(nonDigits,"")
if (userInput.length <= 16) {
current = userInput.chunked(4).joinToString("-")
s.filters = arrayOfNulls<InputFilter>(0)
}
s.replace(0, s.length, current, 0, current.length)
}
}
companion object {
private val nonDigits = Regex("[^\\d]")
}
}

import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;`
public class CreditCard implements TextWatcher
{
EditText editText;
public CreditCard(EditText editText)
{
this.editText = editText;
}
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
try
{
editText.removeTextChangedListener(this);
String str = editText.getText().toString().replaceAll("-", "");
editText.setText(setDash(str));
editText.setSelection(editText.getText().toString().length());
editText.addTextChangedListener(this);
return;
}
catch (Exception ex)
{
ex.printStackTrace();
editText.addTextChangedListener(this);
}
}
public static String setDash(String value)
{
String str = "";
int j = 0;
for (int i = 0;i<value.length(); i++)
{
j++;
if (j == 5)
{
str = str+"-";
j = 1;
}
str = str + value.charAt(i);
}
return str;
}
public static String trimDashOfString(String string)
{
if (string.contains("-")) {
return string.replace("-", "");
} else {
return string;
}
}
}