android - App above all anothers -

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with functionality of android possible make app callable everywhere facebook messenger chat:

enter image description here

you cannot have "full app" above others. however, can achieve convincing simulacrum trick.

applications android.permission.system_alert_window (displayed "draw on other apps" in play store) can create windows service , show them on other content.

there open source library called standout provides behavior in easy use manner. might want take @ it.


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