Floating apps have become emblematic of Android's unique flexibility and range. No other mobile OS allows non-system apps to directly interact with users and overtake the screen while another app is supposed to be in the foreground. This capability allows for a powerful and customizable user experience, but it can also quickly become a problem if an app is poorly implemented or its developer abuses this privilege for malicious purposes.

Android 6.0 Marshmallow is setting some new rules for drawing on the screen. Starting with Developer Preview 3, apps targeting API 23 (or above) will have to ask users to grant permission for them to draw on top of other apps.

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