Develop Reference

android- restrict edittext to accept farsi characters only

I want to restrict my edittext to only accept farsi charecters . charecters like ض ص ث ق ف And so on .
I've tried to use xml digit but it did not work .
how can I do so ?

You can use InputFilter for the EditText. InputFilters can be attached to Editables to constrain the changes that can be made to them.
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
for (int i = start; i < end; i++) {
String text = String.valueOf(source.charAt(i));
Pattern RTL_CHARACTERS = Pattern.compile("[\u0600-
\u06FF\u0750-\u077F\u0590-\u05FF\uFE70-\uFEFF]");
Matcher matcher = RTL_CHARACTERS.matcher(text);
if (matcher.find()) {
return ""; // it's Persian
}
}
return null;
}
};
Use this filter to detect Farsi/Persian characters and restrict them for edittext. Set this filter to your EditText using
editText.setFilters(new InputFilter[]{filter});
This will restrict Farsi/Persian characters

These code can help too:
InputFilter nameFilter = new InputFilter() {
#Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
for (int i = start; i < end; i++) {
if (Character.isLetterOrDigit(source.charAt(i))) { // if digit!
String blockCharacterSet = getString(R.string.all_fa_words) + ' ';
if (blockCharacterSet.contains(String.valueOf(source.charAt(i)))) {
edtNameEdit.setHintTextColor(getResources().getColor(R.color.materialWhite));
edtNameEdit.setHint(getString(R.string.name_lastname));
return null;
} else {
edtNameEdit.setHintTextColor(getResources().getColor(R.color.sPink));
edtNameEdit.setHint(getString(R.string.name_lastname) + ' ' + getString(R.string.must_fa));
return edtNameEdit.getText().toString();
}
} else {
return null;
}
}
return null;
}
};
edtNameEdit.setFilters(new InputFilter[]{nameFilter});
edtNameEdit.setInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);

Restrict special characters & space programmatically

I want to restrict user from entering special characters & space programmatically.
Below is my code
InputFilter[] alphaNumericFilter = new InputFilter[2];
alphaNumericFilter[0] = new InputFilter() {
#Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
for (int k = start; k < end; k++) {
boolean isLetterOrDigit = Character.isLetterOrDigit(source.charAt(k));
boolean isSpaceChar = Character.isSpaceChar(source.charAt(k));
if ((source.length() > 0 && isSpaceChar) ||
(!isLetterOrDigit && !isSpaceChar) ||
(isSpaceChar && TextUtils.isEmpty(dest))) {
return "";
}
}
return null;
}
};
on pressing space it deleting last character.

Use this code to filter your edittext
private String yourCharacterThatYouWantToBlock= " ~#^|$%&*!";
private InputFilter filter = new InputFilter() {
#Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
if (source != null && yourCharacterThatYouWantToBlock.contains(("" + source))) {
return "";
}
return null;
}
};
Now apply this filter to your edittext.
yourEditText.setFilters(new InputFilter[] { filter });

You can do this way:
public static InputFilter getAlphaNumericInputFilter(){
return new InputFilter() {
#Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
if(source.equals("")){ // for backspace
return source;
}
if(source.toString().matches("[a-zA-Z0-9 ]+")){
return source;
}
return "";
}
};
}
Here If you can just changes matches string according to your requirement for eg. avoid space with alphanumeric then It should like this:[a-zA-Z0-9]+.
Hope It help you !

InputFilter alphaNumericFilter = new InputFilter() {
#Override
public CharSequence filter(CharSequence arg0, int arg1, int arg2, Spanned arg3, int arg4, int arg5)
{
for (int k = arg1; k < arg2; k++) {
if (!Character.isLetterOrDigit(arg0.charAt(k))) {
return "";
}
}
return null;
}
};
mFirstName.setFilters(new InputFilter[]{ alphaNumericFilter});

Finally I have resolved this issue by adding below line in the code
mEditText.setInputType(InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
This line will not show suggestions on keyboard.

Set InputFilter for white space and maximum length

I want to use Input filter where I can prevent first space entering AND max length of my edit text limited to 200 characters.
so far I have this:
Hot to I put the maxlength into the same filter
private void setInputFilterForEmailAndPwd(final EditText amountEditText) {
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
for (int i = start; i < end; i++) {
if (Character.isSpace(source.charAt(i))) {
return "";
}
}
return null;
}
};
amountEditText.setFilters(new InputFilter[] { filter });
}
setInputFilterForEmailAndPwd(emailEdit);

I found the solution
I put new Input Filter, instead of setInputFilterForEmailAndPwd:
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
for (int i = start; i < end; i++) {
if (Character.isWhitespace(source.charAt(i))) {
return "";
}
}
return null;
}
};
and then:
emailEdit.setFilters(new InputFilter[] { filter, new InputFilter.LengthFilter(200) });

Block input if it's not the letter "A" [duplicate]

This question already has answers here:
How do I use InputFilter to limit characters in an EditText in Android?
(20 answers)
Closed 9 years ago.
How can I do that if the user is not typing A, then there will not be any output? I want to do this in a EditText.
Code:
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
for (int i = start; i < end; i++) {
if (!Character.toString(source.charAt(i)).equals("a")) {
return "";
}
}
return null;
}
};

You could do it the way that you are attempting to, with an input filter, but I would recommend that you do it in XML instead, by giving your edittext the attribute android:digits="Aa". That should solve your problem.
If you need to use an input filter try this (it is untested and may not work an better than yours)
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
String chars = "";
for (int i = start; i < end; i++) {
if (Character.toString(source.charAt(i)).equals("a")) {
chars = chars + source.charAt(i);
} else {
//don't add anything to the char sequence
}
}
return chars;
}
};

Disable specific keys on the keyboard

As you can disable certain keys on the keyboard to prevent the user to input wrong characters?

the following code is to disable numbers and chars
{
final InputFilter filter = new InputFilter() {
#Override
public CharSequence filter(CharSequence source,
int start, int end, Spanned dest, int dstart,
int dend)
{
for (int i = start; i < end; i++)
{
if (Character.isDigit(source.charAt(i))||Character.isLetter(source.charAt(i)))
{
return "";
}
}
return null;
}
};
answerTXT.setFilters(new InputFilter[]{filter});
}