Turning on screen programmatically

Question

I would like to unlock screen and switching it on to show a popup on an event trigger. I am able to unlock the screen using

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Answer 1

This is very popular question but the accepted answer now is outdated.

Below is latest way to Turn On Screen OR wake up your device screen from an activity:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
    this.setTurnScreenOn(true);
} else {
    final Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
}

Use WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON but FLAG_TURN_SCREEN_ON flag has been deprecated in API level 27 so you can use Activity.setTurnScreenOn(true) from API level 27 onward.