问题
I am trying to turn the android screen off and then on again, after a few seconds. The "turn off" part works, with this code:
WindowManager.LayoutParams layoutParam = getWindow().getAttributes();
oldBrightness = android.provider.Settings.System.getInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS)/255f;
layoutParam.screenBrightness = 0;
layoutParam.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
getWindow().setAttributes(layoutParam);
But then, when I try to turn the screen on again, it does not work with this code:
WindowManager.LayoutParams layoutParam = getWindow().getAttributes();
layoutParam.screenBrightness = oldBrightness;
layoutParam.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
getWindow().setAttributes(layoutParam);
Any idea to solve that ?
thanks
回答1:
I think U can try Powermanager WakeLock maybe it will work. I m using this code in my application. and it works well. :)
Also u need to set permission in manifest.
<uses-permission android:name="android.permission.WAKE_LOCK"/> // Manifest Permission
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK
| PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
wakeLock.acquire();
回答2:
First off, are you sure about the "/255f" in this line:
oldBrightness = android.provider.Settings.System.getInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS)/255f;
What is the value in "oldBrightness" when you get/set it ?
Maybe you could try this:
PowerManager.WakeLock lck = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "tag");
lck.acquire();
The normal wake lock doesn't turn the screen on but causes it to stay on when a user causes it. But this flag forces the screen to turn on immediately. It requires the "android.permission.WAKE_LOCK".
More about it:
http://developer.android.com/reference/android/os/PowerManager.html#PARTIAL_WAKE_LOCK
And the screen properties (on, off, bright, dim, etc.):
http://developer.android.com/reference/android/os/PowerManager.html
来源:https://stackoverflow.com/questions/10469511/turn-off-on-android-screen