How to Set Different Background Images for ToggleButton States in Android XML?

How can I specify different images for the checked and unchecked states of a ToggleButton in Android using XML?

<ToggleButton android:id="@+id/FollowAndCenterButton"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="5dp"
        android:background="@drawable/toggle_button_background"
        android:textOn=""
        android:textOff=""/>

To set different background images for the checked and unchecked states of a ToggleButton in Android, you can use a drawable selector, which allows you to define how the button should appear based on its state. Here's how you can implement this effectively.

<!-- In res/drawable/toggle_button_background.xml -->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:drawable="@drawable/locate_me_on" /> <!-- Checked state -->
    <item android:drawable="@drawable/locate_me" /> <!-- Default/Unchecked state -->
</selector>

Causes

• The ToggleButton does not natively support changing background images based on state through the XML attributes.
• Using a selector with android:state_checked does not work as expected for ToggleButton when applied to the background.

Solutions

• Create a drawable selector file that defines the different images for the checked and unchecked states.
• Use the selector as the background of your ToggleButton in the XML layout.

Mistake: Not using 'state_checked' in the correct context or selector.

Solution: Ensure to define the 'state_checked' in the selector properly as shown in the example above.

Mistake: Using pixel units (px) instead of density-independent pixels (dp) in layout dimensions.

Solution: Always use 'dp' for layout width and height to maintain consistent sizes across different screen densities.