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android - How to overlay views in other apps

Where do I start?

I don't know what functions or permissions will I use to make this. No root required.

The view look like this, the camera button on the right side, it is floating and visible to other apps, if you push it, it will capture a screenshot.

enter image description here

Note: I will not make make a screenshot app, this is only an example of what I want to achieve.

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