Develop Reference

Use InputType Number but format edittext live text to phone number format

So the easiest way for the edittext to format your input is to use the phone inputType. The problem is that this gives you a few other symbols other then numbers. And I don't want the user to be able to type in those symbols.
I tried to only listen to digits by doing android:digits by this causes the input to no longer be formatted.
Is there a trick that i could do to get this to work? Other then writing a custom textWatcher that formats the text.

If you want to show only numbers in your keyboard just like this screenshot
You have to use numberPassword input type instead of phone input type
android:inputType="numberPassword"
But when you apply this your entries in editText appear as bullets because inputType is numberPassword, So to solve this problem make a new java class for example:
public class NumberKeyPadTransformationMethod extends PasswordTransformationMethod {
#Override
public CharSequence getTransformation(CharSequence source, View view) {
return source;
}}
And in your main activity where you fetch the ids of edittext or where you use that edittext you have to simply add one line of code
editText.setTransformationMethod(new NumberKeyPadTransformationMethod());
Your whole problem will solve.
Hope this will help you.

You should use as Athira pointed:
android:inputType="number"
and if you want decimal numbers then:
android:inputType="numberDecimal"

Difference between NumberFlagDecimal and NumberFlagSigned

I just want a numeric keypad in my android Xamarin application.
so which is better input type and why ?

from the docs
public static final int TYPE_NUMBER_FLAG_DECIMAL
Flag of TYPE_CLASS_NUMBER: the number is decimal, allowing a decimal
point to provide fractional values.
public static final int TYPE_NUMBER_FLAG_SIGNED
Flag of TYPE_CLASS_NUMBER: the number is signed, allowing a positive
or negative sign at the start.

If you want nothing but numbers allowed to be entered in your EditText` just set the digits property:
<EditText
.
.
.
android:inputType="numberDecimal|number"
android:digits="1234567890"
./>
You can also use the set the InputType as TYPE_CLASS_NUMBER
This will disable everything else but numbers good luck.
Revert in case of queries.

Solution:
If you want a keyboard only with number and without any other characters, you can do following steps:
Set your keyboard's inputType: numberPassword
<EditText
android:id="#+id/edit"
android:text=""
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:inputType="numberPassword"
/>
Then you will get a keyboard with only with numbers, however you will find numbers in EditText is invisible as security enter.
If you want to make the numbers visible in the EditText, you need to customize PasswordTransformationMethod:
private class NumericKeyBoardTransformationMethod : PasswordTransformationMethod
{
public override ICharSequence GetTransformationFormatted(ICharSequence source, View view)
{
return source;
}
}
And finally we need implementing it to the EditText in order to display the characters typed.
EditText myedit = FindViewById<EditText>(Resource.Id.edit);
myedit.TransformationMethod = new NumericKeyBoardTransformationMethod();
I find solution here and I translate it into C# code. Hope it will help you.

Android: Deleting characters in EditText with TextWatcher still shows characters in suggestions

In my activity I have an EditText to capture a file name. I am using a TextWatcher to prevent users from entering certain characters that I don't want them to use in their filename. Essentially I only want users to enter in the following characters: [a-zA-Z_0-9].
#Override
public void afterTextChanged(Editable text) {
String textStr = text.toString();
int length = text.length();
if (!Pattern.matches("\\w*", textStr)) {
text.delete(length-1, length);
}
}
EDIT: Adding more code
in onCreate(...)
fileNameEditText = (EditText)findViewById(R.id.UploadPhoto_fileNameEditText);
fileNameEditText.addTextChangedListener(this);
in layout xml file
<EditText
android:id="#+id/UploadPhoto.fileNameEditText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20sp"
android:layout_marginRight="10sp"
android:layout_toRightOf="#id/UploadPhoto.fileNameLabel"/>
This works perfectly by preventing users from entering in things like "\" and ".". The problem that I'm having is that if they type these characters they show up in the word suggestions box. Its kind of annoying because if you try to delete a character using backspace, it deletes from the suggestion first (even though the character doesn't show up in EditText box).
How do you prevent the unwanted characters from showing up in the word suggestiong box?
See screen shot below. Notice that the "-" (hyphen) appears in the suggestion box, but not in the EditText. Also notice that there is another valid character in the suggestion box after the hyphen that also does not show up in the EditText. This essentially blocks the user from entering in more text until they delete the hyphen, even though its not in the EditText.
UPDATE: The same issue arises and can be reproduced by using an InputFilter instead of a TextWatcher.
UPDATE: I'd like to clarify that my goal is not to suppress the Suggestions altogether. The issue is that when you prevent specific characters from appearing in the EditText, they still show up in the Suggestions. My goal (which the bounty is for) is to prevent the same specific characters from appearing in the Suggestions.

You should use an InputFilter to restrict some characters in Edittext
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.isLetterOrDigit(source.charAt(i))) {
return "";
}
}
return null;
}
};
edit.setFilters(new InputFilter[]{filter});

It seems that the emulator doesn't support the textNoSuggestions, and the corresponding FLAG (TYPE_TEXT_FLAG_NO_SUGGESTIONS). It's realy anoying, but hey: you're not developing for emulator users, you shouldn't be preoccupied with this, it'll work fine on allmost all devices.
(Note that this flag is available only from API level 5)

We can do that in the layout xml file and achive what you have asked in an easy way, insert the line
android:numeric="your custom elements"
android:digits="your custom elments"
android:inputType="your custom elements"
when you implement these then you will be able to type the words that you want to.

Permit only 1 character in EditText and always overwrite when user input it

I need to make an EditText which would accept only one character and only character (letter/alpha). And if user enters other char, it should replace existing one (like overwrite method of text input with 1 allowed symbol).
I know how to set the max length of text in properties. But if I set it
to 1, then no other char could be inserted before user deletes an
existing one. But I want to replace existing char with that new entered
one automatically without manual deleting. How to do that?
I know how to set property to allow only digits in an EditText, but I
can't figure out how to allow only chars. So the second question is how to allow only characters in EditText?
Currently I'm using an EditText with max text size=2 with the following code:
final EditText editLetter = (EditText)findViewById(R.id.editHouseLetter);
editLetter.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
if (s!=null && s.length()>1){
editLetter.setText(s.subSequence(1, s.length()));
editLetter.setSelection(1);
}
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
});
The point is, when a user enters a second char, the first one should be deleted. Making text size to 2 allows user to enter another char after one has been already entered.
I don't really understand how it works but it does :). And additionally I had to point cursor in EditText to the last position because it always goes to beginning which makes unable to enter anything at all. Didn't get why is that either.
Main point of this solution is that it has a 2-chars sized EditText, but I want it 1-char sized. And it allows to enter anything besides the letters(chars/alpha) and I want nothing but chars.
Using the advice provided by sgarman and Character.isLetter() function, afterTextChanged method looks this way now:
public void afterTextChanged(Editable s) {
int iLen=s.length();
if (iLen>0 && !Character.isLetter((s.charAt(iLen-1)))){
s.delete(iLen-1, iLen);
return;
}
if (iLen>1){
s.delete(0, 1);
}
}
I've discovered that using Selection.setSelection is not required in this case. Now it has a filter allowing input of letters only. It's almost the answer that I want. The only one thing left is how to do the same with 1-symbol sized EditText?

Add the following line to your layout XML file android:maxLength="1"
Following is an example of adding it to an editText element:
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="text"
android:maxLength="1" >
I faced the same problem and found this more straightforward solution. Please refer to this blog for more details.
Edit: Please note that my answer is for defining the max number of characters, however, it does not overwrite upon user input.

Try:
s.delete(0, 1);
Selection.setSelection(s, s.length());

I wanted to do the same thing and I used your code in afterTextChanged(Editable s) and also set one filter on the editText like this.
editText.setFilters(new InputFilter[] {new InputFilter.LengthFilter(2)});
It worked as we wanted.

How do you set EditText to only accept numeric values in Android?

I have an EditText in which I want only integer values to be inserted. Can somebody tell me which property I have to use?

Add android:inputType="number" as an XML attribute.

For example:
<EditText
android:id="#+id/myNumber"
android:digits="0123456789."
android:inputType="numberDecimal"
/>

In code, you could do
ed_ins.setInputType(InputType.TYPE_CLASS_NUMBER);

For only digits input use android:inputType="numberPassword" along with editText.setTransformationMethod(null); to remove auto-hiding of the number.
OR
android:inputType="phone"
For only digits input, I feel these couple ways are better than android:inputType="number". The limitation of mentioning "number" as inputType is that the keyboard allows to switch over to characters and also lets other special characters be entered. "numberPassword" inputType doesn't have those issues as the keyboard only shows digits. Even "phone" inputType works as the keyboard doesnt allow you to switch over to characters. But you can still enter couple special characters like +, /, N, etc.
android:inputType="numberPassword" with editText.setTransformationMethod(null);
inputType="phone"
inputType="number"

android:inputType="numberDecimal"

<EditText
android:id="#+id/age"
android:numeric="integer"
/>

Try the following code:
Edittext_name.setKeyListener(DigitsKeyListener.getInstance("0123456789"));
It will allow you to enter just numbers. You cannot enter chars.
if you want to enter chars, not numbers, you can edit the values between the quotes inside getInstance.

using the below can solve your problem better;
in xml:
<EditText
android:id="#+id/age"
android:inputType="numberDecimal|numberSigned" />
or //in activity inside etfield.addtextchangelistener
private String blockCharacterSet="+(/)N,*;#";//declare globally
try {
for (int i = 0; i < s.length(); i++) {
if (blockCharacterSet.contains(s.charAt(i) + "")) {
String corrected_settempvalue = arrivalsettemp.substring(0, arrivalsettemp.length() - 1);
et_ArrivalSetTemp.setText(corrected_settempvalue);
if (corrected_settempvalue.length() != 0)
et_ArrivalSetTemp.setSelection(corrected_settempvalue.length());
}
}
} catch (Exception d) {
d.printStackTrace();
}

If anyone want to use only number from 0 to 9 with imeOptions enable then use below line in your EditText
android:inputType="number|none"
This will only allow number and if you click on done/next button of keyboard your focus will move to next field.

You can use it in XML
<EditText
android:id="#+id/myNumber"
android:digits="123"
android:inputType="number"
/>
or,
android:inputType="numberPassword" along with editText.setTransformationMethod(null); to remove auto-hiding of the number.
or,
android:inputType="phone"
Programmatically you can use
editText.setInputType(InputType.TYPE_CLASS_NUMBER);

I need to catch pressing Enter on a keyboard with TextWatcher. But I found out that all numeric keyboards android:inputType="number" or "numberDecimal" or "numberPassword" e.t.c. don't allow me to catch Enter when user press it.
I tried android:digits="0123456789\n" and all numeric keyboards started to work with Enter and TextWatcher.
So my way is:
android:digits="0123456789\n"
android:inputType="numberPassword"
plus editText.setTransformationMethod(null)
Thanks to barmaley and abhiank.

I don't know what the correct answer was in '13, but today it is:
myEditText.setKeyListener(DigitsKeyListener.getInstance(null, false, true)); // positive decimal numbers
You get everything, including the onscreen keyboard is a numeric keypad.
ALMOST everything. Espresso, in its infinite wisdom, lets typeText("...") inexplicably bypass the filter and enter garbage...

the simplest for me
android:numeric="integer"
although this also more customize
android:digits="0123456789"