Android 9 Development Cookbook - Third Edition

How to do it...

To start, we will add string resources for our menu items and a button to toggle the menu visibility. Open the res/strings.xml file and follow these steps:

1. Add the following two strings to the existing <resources> element:

    <string name="menu_download">Download</string> 
    <string name="menu_settings">Settings</string> 

2. Delete the existing TextView and add a button to activity_main.xml with onClick() set to toggleMenu as shown here:

    <Button        android:id="@+id/buttonToggleMenu"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Toggle Menu"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintEnd_toEndOf="parent"        app:layout_constraintStart_toStartOf="parent"        app:layout_constraintTop_toTopOf= ...