java - Is it possible for an Android app to modify the screen at all times? -

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to give ridiculous example, have water app/service stayed on display @ times (or perhaps when not actively using application) , caused ripples occur when touched screen? not want app this, it's example.

i know there live wallpaper this, in background. if wanted affect on top of icons , widgets , ui well?

is possible?

is possible?

if write own firmware, yes. android sdk applications cannot this.


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