The Facebook Android Messenger application has a feature called Chat Heads. It lays a chat icon and window over the top of other applications. How is this achieved? Which Android APIs are used?
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Search for permission android.permission.SYSTEM_ALERT_WINDOW and WindowManager.LayoutParams.TYPE_SYSTEM_ALERT.
See this blogpost by Daniel Jankowski and his WindowHead sample on GitHub.
In addition to the duplicate answer already listed, also see:
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G. Lombard
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Is that used in gmail app also? for composing new mail – Ebin James Jan 14 '15 at 12:04
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3@EbinJames I don't think so. Do you mean the Floating Action Button? Maybe this is what you have in mind: https://github.com/shell-software/fab – G. Lombard Feb 24 '15 at 15:32
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https://github.com/flipkart-incubator/springy-heads might be useful. – Kiran Kumar Dec 29 '15 at 09:08