Background transition on Android

BackgroundTransitionView.java

TransitionDrawable transition = (TransitionDrawable) view.getBackground();
if (toggle) {
	view.startTransition(1200);
} else {
	view.reverseTransition(1200);
}

layout.xml

android:background="@drawable/transition_drawable"

transition_drawable.xml

<?xml version="1.0" encoding="UTF-8"?>
<transition xmlns:android="http://schemas.android.com/apk/res/android" >
    <!-- The drawables used here can be solid colors, gradients, shapes, images, etc. -->
    <item android:drawable="@drawable/selector_button"/>
    <item android:drawable="@drawable/selector_button_off"/>
</transition>