ontextchange android

I need the method or the action when the EditText change开发者_如何学编程d. When the user write in EditText I want to have some action. How to do that?

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You can use View.setOnKeyListener(), see here.

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There are three methods you can register

beforeTextChanged
onTextChanged
afterTextChanged

Example reference: Counting Chars in EditText Changed Listener

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I always do it with a TextWatcher, and overriding the afterTextChanged like this:

mEditText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) { }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) { }

    @Override
    public void afterTextChanged(Editable editable) {
        String newText = editable.toString();
    }
});