Implementing Press States for Android Buttons
How to implement visual press feedback on Android buttons and images using state list drawables.
Providing visual feedback when a user taps a button is essential for a responsive user experience. In Android, this is achieved using state list drawables.
Implementation
1. Prepare two drawable assets: button_normal.png for the default state and button_selected.png for the pressed state. Place both in res/drawable.
2. Create a state list drawable button_style.xml in res/drawable:
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android:drawable="@drawable/button_selected" />
3. Apply the drawable to your button:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/button_style" />
The framework handles the state transitions automatically. When the user presses the button, the selected drawable is displayed; when released, it reverts to the default. This simple pattern provides immediate, tactile feedback that users expect from a well-built application.