Creating overlay window app for Android?


I have just started working as software developer. My first programming project is creating an app for Android version 6.0.1 to Garmin fleet 790 GPS-navigator.

I should create an overlay window app which drawing on top of every other apps. I need also use Android drawing routines for creating a custom buttons.
How could I create overlay app which allows to use other app same time when my app is on.

Lot of thanks for everyone who can help me!
Best regards,
Janne Lahdenperä

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