Hello everyone

please may you tell me how i can turn off back light of android
device, i try through the setBrightness method but it not works on
emulator

My main task is to develop a application in which on some event I have
to notify the user like by alarm in which a "Flashing or Blinking
Screen" is required,

so how i can do this, one thing I use the Service, so please let me
know the methods which only called through Services, not from activity

Thanks

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