How to make a prepend on Android?
I currently do some append , but did not see how to do a prepend in the onTextChanged event.
The reason is to put a ( before the first 2 digits of a phone, to get the (xx) x xxxx - xxxx mask.
That is, this ( would be entered after the user entered the first digit but before it.
Use the method afterTextChanged() of TextWatcher:
@Override
public void afterTextChanged(Editable editable) {
if(editable.length() == 1 && !editable.toString().equals("(")){
editable.insert(0, "(");
}
}
If you want ( to be deleted when the first number is deleted, use:
@Override
public void afterTextChanged(Editable editable) {
if(editable.toString().equals("(")){
editable.clear();
return;
}
if(editable.length() == 1) {
editable.insert(0, "(");
}
}