如何在插入时保持Android设备不被睡眠

Question

I'd like to keep the screen on whenever one of my Activities are running and the phone is plugged in to a power source. I know that Wakelocks are tricky, so I'm looking for an example or some documentation on how to accomplish this specific goal.

Answer 1

Don't use wake locks for this -- just set and clear the window flag WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON based on whether the device is currently plugged in. You can set the flag with Activity.getWindow().addFlags() .

So the code would be

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

Answer 2

A WakeLock isn't that tricky, just make sure to check that it isn't already held when you call acquire() and make sure it is held when you call release() . You also want to make sure you have the android.permission.WAKE_LOCK permission defined in your manifest file.

If you only want to acquire the WakeLock when the phone is plugged in, you can register a BroadcastReceiver that watches for the android.intent.action.ACTION_POWER_CONNECTED and android.intent.action.ACTION_POWER_DISCONNECTED intents. I haven't used these myself, so there may be some application permission you need to get before these intents will actually work.