Android 9 Development Cookbook - Third Edition

How to do it...

To demonstrate, we'll create a Confirm Delete dialog to prompt the user for confirmation after pressing the Delete button. Start by opening the main_activity.xml layout file and follow these steps:

1. Add the following <Button>:

<Button    android:id="@+id/buttonDelete"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Delete"    android:onClick="confirmDelete"    app:layout_constraintBottom_toBottomOf="parent"    app:layout_constraintLeft_toLeftOf="parent"    app:layout_constraintRight_toRightOf="parent"    app:layout_constraintTop_toTopOf="parent" />

2. Add the confirmDelete() method to ActivityMain.java; this is called by the button:

public void confirmDelete(View view) { AlertDialog.Builder ...