Allow only selected charcters based on regex in an EditText
Used a TextWatcher
as @Matt Ball suggested.
@Override
public void afterTextChanged(Editable s) {
String text = s.toString();
int length = text.length();
if(length > 0 && !Pattern.matches(PATTERN, text)) {
s.delete(length - 1, length);
}
}
Edit
Although the TextWatcher
works, it would be cleaner to use an InputFilter
. Check this example.
You could use android:digits
on the xml EditText instead of using a regex.
For your allowed chars of the regex (numbers, comma and plus symbol):
android:digits="0123456789,+"
And you could use a string resource as the digits value in case you want to reuse it.