addTextChangedListener

The addTextChangedListener method is used to set a listener on an EditText view in Android. This listener is called whenever the user types or deletes text within the EditText view.

Syntax:

editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // This method is called before the text is changed
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // This method is called when the text is changed
    }

    @Override
    public void afterTextChanged(Editable s) {
        // This method is called after the text is changed
    }
});

This method takes a TextWatcher object as an argument. The TextWatcher interface has three methods that need to be implemented:

- beforeTextChanged: This method is called before the text is changed.
- onTextChanged: This method is called when the text is changed.
- afterTextChanged: This method is called after the text is changed.

You can use these methods to perform actions based on the user's input, such as validating the input, updating a counter, or enabling/disabling a button.