Gradient with Animation

gradient.xml

// gradients
// gradient_1.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
  <gradient
      android:angle="225"
      android:endColor="#1a2980"
      android:startColor="#26d0ce" />
</shape>

// gradient_2.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
        android:angle="45"
        android:endColor="#614385"
        android:startColor="#516395" />
</shape>


// gradient_3.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
        android:angle="135"
        android:endColor="#1d2b64"
        android:startColor="#f8cdda" />
</shape>

// gradient_4.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
        android:angle="45"
        android:endColor="#ff512f"
        android:startColor="#dd2476" />
</shape>

// gradient_5.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
        android:angle="135"
        android:endColor="#34e89e"
        android:startColor="#0f3443" />
</shape>

// animation.xml in drawable folder
<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/gradient_1"
        android:duration="5000" />
    <item
        android:drawable="@drawable/gradient_2"
        android:duration="5000" />
    <item
        android:drawable="@drawable/gradient_3"
        android:duration="5000" />
    <item
        android:drawable="@drawable/gradient_4"
        android:duration="5000" />
    <item
        android:drawable="@drawable/gradient_5"
        android:duration="5000" />
</animation-list>

// apply animation as a background
android:background="@drawable/animation"

// add an id to the element where you added the background 
// in this example the element is a LinearLayout
android:id="@+id/layoutMain"

// java call
private void setAnimation() {
        LinearLayout linearLayout = findViewById(R.id.layoutMain);
        AnimationDrawable animationDrawable = (AnimationDrawable) linearLayout.getBackground();
        animationDrawable.setEnterFadeDuration(2500);
        animationDrawable.setExitFadeDuration(5000);
        animationDrawable.start();
}