Android 9 Development Cookbook - Third Edition

How to do it...

We just need a single button to call our code to send the notification. Open activity_main.xml and follow these steps:

1. Replace the existing <TextView> with the following button code:

<Button    android:id="@+id/button"    android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="Show Notification"     android:onClick="showNotification"    app:layout_constraintBottom_toBottomOf="parent"    app:layout_constraintLeft_toLeftOf="parent"    app:layout_constraintRight_toRightOf="parent"    app:layout_constraintTop_toTopOf="parent" />

2. Open MainActivity.java and add the showNotification() method:

@SuppressWarnings("deprecated")public void showNotification(View view) {    Intent activityIntent = new Intent(this, ...