Prepend in an Edittext using Textwatcher

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How to make a prepend on Android?

Currently I do some append, but I didn’t see how to make a prepend at the event onTextChanged.

The reason is to put one ( before the first 2 digits of a phone, for the mask (xx) x xxxx - xxxx.

That is, this ( would be inserted after the user has placed the first digit but before it.

android edittext

1 answer

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Use the method afterTextChanged() textwatcher:

@Override
public void afterTextChanged(Editable editable) {
    if(editable.length() == 1 && !editable.toString().equals("(")){
        editable.insert(0, "(");
    }
}

Should you want the ( is 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, "(");
    }
}

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