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How to add a PNG image as background in Android with no alteration (banding)?
android:background="@drawable/background_gradient_dithered"

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/background_gradient" android:dither="true" android:antialias="true" android:filter="true"/>

getWindow().setFormat(PixelFormat.RGBA_8888);

Window window = getWindow();
window.setFormat(PixelFormat.RGBA_8888);
window.addFlags(WindowManager.LayoutParams.FLAG_DITHER);

window.addFlags(WindowManager.LayoutParams.FLAG_DITHER);