How can I add images and videos like this? Is there any keyword to look for tutorials?
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Just add an ImageView matching parent size in your layout? – Eselfar May 06 '17 at 00:34
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This picture appears in every apps. No matter which app is open, these pictures and videos are in front of it. – user3469764 May 06 '17 at 01:00
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Maybe this post can help: http://stackoverflow.com/questions/4481226/creating-a-system-overlay-window-always-on-top – Eselfar May 06 '17 at 01:04