Turning on screen from receiver/service

Question

I would like my app to be able to turn the screen on and display my app. Let's say I'm setting an alarm and every hour I want my app to be displayed for 2 mins before the device naturally sleeps.

I see that WakeLock (FULL_LOCK) and KeyguardManager are deprecated.

I have created a WakefulBroadcastReceiver and service and these are working.

@Override
protected void onHandleIntent(Intent intent) {
    // I need to show the screen here!

    for (int i=0; i<5; i++) {
        Log.i("SimpleWakefulReceiver", "Running service " + (i + 1)
                + "/5 @ " + SystemClock.elapsedRealtime());
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
        }
    }
    Log.i("SimpleWakefulReceiver", "Completed service @ " + 
          SystemClock.elapsedRealtime());
    SimpleWakefulReceiver.completeWakefulIntent(intent);
}

How do I programmatically turn on the screen, get past lock and display my Activity from the IntentService ?

Thanks

Answer 1

You can use this code to turn the screen on.

lock = ((KeyguardManager) getSystemService(Activity.KEYGUARD_SERVICE)).newKeyguardLock(KEYGUARD_SERVICE);
powerManager = ((PowerManager) getSystemService(Context.POWER_SERVICE));
wake = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");

lock.disableKeyguard();
wake.acquire();
           getWindow().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);

You need the following permission in AndroidManifest.xml file:

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

EDIT (USE THIS ONE, NOTHING IS DEPRECATED):
There is an one more alternative for doing this, for that you need to launch an activity, In the activity onCreate() you need to add the flags to the window. For example:

   @Override
    protected void onCreate(Bundle savedInstanceState) {
      getWindow().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);`
}

Answer 2

I don't know what you're talking about, wakelock is definitely not deprecated. Certain types are no longer the Google preferred way of doing things, but normal wakelocks are still around and still the easiest way of doing this. Make sure to add the ACQUIRE_CAUSES_WAKEUP flag when taking the lock. In fact notice that a WakefulBroadcastReceiver is implemented by using wakelocks.

Answer 3

You can use this code to turn the screen on.

private void turnScreenOn() {
    int flags = WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON;
    getWindow().addFlags(flags);
}

You can use this code to keep it on until the wake lock is dimissed.

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

private PowerManager mPowerManager;
private PowerManager.WakeLock mWakeLock;

@Override
public void onCreate() {
super.onCreate();
    mPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
    mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "Service");
}

private void acquireWakeLock() {
    try {
        mWakeLock.acquire();
    }
    catch (Exception e) {
        e.printStackTrace();
    }
}

private void releaseWakeLock() {
    try {
        mWakeLock.release();
    }
    catch (Exception e) {

    }
}