Suggestion

[NOS-AE]

@Override public void onPageSelected(int position) { getWindow().getDecorView().setBackgroundColor(colors[position % colors.length]); } in DetialActivity of the sample can be omitted, because you've got the ArgbEvaluator working fine:). If not doing so, this line will take effect immediately after tapping up, which causes an unfriendly flash...You know.