title: Android change screen tint
body: <p>I want to create an app that tints the entire android screen a certain color. The tint or color overlay would be global. Similar to <a href="https://play.google.com/store/apps/details?id=com.netmanslab.sa&amp;hl=en" rel="nofollow">this</a>. How would I even do this? Would it be a widget? Code samples appreciated!</p>