Android 9 Development Cookbook - Third Edition

How to do it...

We'll add a button to the layout to check the orientation on demand. Start by opening activity_main.xml and follow these steps:

1. Replace the existing TextView with the following Button:

<Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Check Orientation"    android:id="@+id/button"    android:onClick="checkOrientation"    app:layout_constraintBottom_toBottomOf="parent"    app:layout_constraintLeft_toLeftOf="parent"    app:layout_constraintRight_toRightOf="parent"    app:layout_constraintTop_toTopOf="parent" />

2. Add the following method to handle the button click:

public void checkOrientation(View view){    int orientation = getResources()            .getConfiguration().orientation;    switch (orientation) {        case ...