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I'm using various android devices for home-automation control and monitoring, and want to have one by my bed. One thing I want to use it for is a light-based alarm clock, but I need to control the backlight brightness.

Ideally I'd like to control this from javascript, even if that means having another app run locally that gives javascript a roundabout-API to the brightness.

Overlaying a black window won't do; it still lets light through.

How can I control the screen brightness programmatically?

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