Turning screen on/off via Window flags

Question

While the phone is sleeping I want to have an animated activity (much like the phone ringer animation).

I've read many posts regarding turning the screen on using the WindowManager flags, so what I did was adding this piece of code to my activity's onCreate() function:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(
         WindowManager.LayoutParams.FLAG_FULLSCREEN |
         WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | 
         WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON,

         WindowManager.LayoutParams.FLAG_FULLSCREEN |
         WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
         WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
    );

    setContentView(R.layout.act_image_activity);
    startAnimation();
}

My issues are:

The animation starts with a small delay; when the screen turns on, I can see the keyguard (or the home screen when the keyguard is disabled), and after that my activity kicks in.
After calling my activity's finish() method, the phone doesn't go to sleep right away, rather it starts the sleep timer all over again.

Can someone please tell me how can I get my animated activity to display immediately after the screen turns on, and have the screen turn off immediately after it finishes ?

Please check the answer as accepted if it helps – Talha Nov 22 '12 at 08:00 — Talha, Nov 22 '12 at 08:00

score 0 · Answer 1 · answered Nov 19 '12 at 21:51

But this reciever to your manifest

<receiver android:name="IntentReceiver" >
<intent-filter>
     <action android:name="android.intent.action.SCREEN_ON" ></action>
     <action android:name="android.intent.action.SCREEN_OFF" ></action>
</intent-filter>
</receiver>

 public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       this.requestWindowFeature(Window.FEATURE_NO_TITLE);
       setContentView(R.layout.activity_main);

       registerReceiver(new BroadcastReceiver() {                           
       public void onReceive(Context arg0, Intent arg1) {
            Log.v("tag", "screen on");
            // You can catch  screen on here and start your animation
         }
       }, new IntentFilter(Intent.ACTION_SCREEN_ON));

       registerReceiver(new BroadcastReceiver() {
       public void onReceive(Context arg0, Intent arg1) {
            Log.v("tag", "screen off");
            // You can catch  screen off here and start your animation
          }
        }, new IntentFilter(Intent.ACTION_SCREEN_OFF));
    }

score 0 · Answer 2 · answered Nov 19 '12 at 21:54

0

As for the initial delay and seeing a part of the keyguard, I don't think there's a way to prevent that. However, you can force the screen to turn off by calling PowerManager.goToSleep.

answered Nov 19 '12 at 21:54

Bruno Oliveira

5,056
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1

You can't turn off the screen as a normal app since you don't get the required permission: http://stackoverflow.com/questions/5710971/android-what-permissions-required-to-call-powermanager-gotosleepn-put-device-i – zapl Nov 19 '12 at 22:01

Turning screen on/off via Window flags

2 Answers2