Turn ON Screen programmatically on Android

Question

I need to programmatically turn the screen on when the user turns off with power button, and yes I always have the correct flags in the Activity to keep screen on, but it does not avoid user pressing power button.

So far I've found a solution but it uses a deprecated wakelock

sWakeLock = sPM.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, TAG_WAKELOCK);

sWakeLock.acquire();
sWakeLock.release();

There is a better way to achieve it?

Answer 1

In Lollipop you might want to add some more flags:

final Window win = getWindow();
    win.addFlags( WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
            WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON |
            WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON |
            WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON );

I got this from the AOSP https://android.googlesource.com/platform/packages/apps/DeskClock/+/dfd1960/src/com/android/deskclock/alarms/AlarmActivity.java

Answer 2

Code

 PowerManager powerManager = (PowerManager) context.getSystemService(context.POWER_SERVICE);
    PowerManager.WakeLock  wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK |
            PowerManager.ACQUIRE_CAUSES_WAKEUP |
            PowerManager.ON_AFTER_RELEASE, "appname::WakeLock");

    //acquire will turn on the display
    wakeLock.acquire();

    //release will release the lock from CPU, in case of that, screen will go back to sleep mode in defined time bt device settings
    wakeLock.release();

in the Manifest file, the permission should be

<uses-permission android:name="android.permission.WAKE_LOCK"/>

Answer 3

Here is the latest way to Turn On 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 FLAG_TURN_SCREEN_ON but this flag has been deprecated in API level 27 so use Activity.setTurnScreenOn(true) from API level 27 onwards.