Fix issue #5273986: The power usage of the mp3 background playback...

...increased from ~50mA to 260mA

Change-Id: I24d7188185f4ec5ff9e1f29c15472ae56c851e5e

Author: Dianne Hackborn

core/java/android/service/wallpaper/WallpaperService.java

@@ -36,6 +36,7 @@
 import android.os.IBinder;
 import android.os.Looper;
 import android.os.Message;
+import android.os.PowerManager;
 import android.os.Process;
 import android.os.RemoteException;
 import android.util.Log;
@@ -716,7 +717,9 @@ void attach(IWallpaperEngineWrapper wrapper) {
             mSession = ViewRootImpl.getWindowSession(getMainLooper());
 
             mWindow.setSession(mSession);
-            
+
+            mScreenOn = ((PowerManager)getSystemService(Context.POWER_SERVICE)).isScreenOn();
+
             IntentFilter filter = new IntentFilter();
             filter.addAction(Intent.ACTION_SCREEN_ON);
             filter.addAction(Intent.ACTION_SCREEN_OFF);