android textonchaanged example

 android textonchaanged example

Here is an example of how you can use the TextWatcher interface in Android to detect changes in an EditText widget:

EditText editText = findViewById(R.id.edit_text);

editText.addTextChangedListener(new TextWatcher() {

    @Override

    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        // Do nothing

    }

    @Override

    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        // Do something when text is changed

    }

    @Override

    public void afterTextChanged(Editable editable) {

        // Do nothing

    }

});

When the text in the EditText widget is changed, the onTextChanged method will be called, and you can put the code that you want to execute when the text is changed in this method.

In this example, we are using the TextWatcher interface to listen for changes in an EditText widget. To use the TextWatcher interface, you have to create an instance of the TextWatcher and attach it to your EditText widget using the addTextChangedListener method.

There are three methods in the TextWatcher interface:

beforeTextChanged: This method is called before the text in the EditText widget is changed.

onTextChanged: This method is called when the text in the EditText widget is changed. You can access the new text using the charSequence parameter.

afterTextChanged: This method is called after the text in the EditText widget is changed.

In this example, we have left the beforeTextChanged and afterTextChanged methods empty, and we put the code that we want to execute when the text is changed in the onTextChanged method.

Note that in the onTextChanged method, the charSequence parameter contains the new text in the EditText widget. You can use this parameter to access the new text and perform any operations that you need to do based on the new text.