The android.widget.EditText.addTextChangedListener method is a listener that allows developers to be notified when the text in an EditText widget is changed. This method can be particularly useful if developers want to update the screen or other elements of an app in real-time.
Example 1:
EditText editText = findViewById(R.id.edit_text); editText.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { // Do something before text is changed }
@Override public void onTextChanged(CharSequence s, int start, int before, int count) { // Do something when text is changed }
@Override public void afterTextChanged(Editable s) { // Do something after text is changed } });
In this example, we are adding a TextWatcher listener to an EditText widget. The listener has three methods: beforeTextChanged, onTextChanged, and afterTextChanged. Each method handles a different part of the text changing process, allowing developers to perform specific actions at different points.
Example 2:
public class MainActivity extends AppCompatActivity { EditText editText;
private class CustomTextWatcher implements TextWatcher { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { // Do something before text is changed }
@Override public void onTextChanged(CharSequence s, int start, int before, int count) { // Do something when text is changed }
@Override public void afterTextChanged(Editable s) { // Do something after text is changed } } }
In this example, we have a CustomTextWatcher class that implements TextWatcher. Instead of adding TextWatcher directly to the EditText widget, we are creating our own custom listener and adding that to the widget. This allows us to encapsulate the listener code in its own class, which can be useful if we need to reuse the listener code across multiple widgets.
The android.widget.EditText.addTextChangedListener method is part of the Android SDK and does not require any external package libraries.
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