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.
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