Lock screen doesn't cause onStop() to get called

My app uses GPS, so I remove GPS updates in onStop() so it doesn't use up battery when it shouldn't. However, I noticed that the battery on my test phone was running down if my app was open when the lock screen comes on.

So to test it, I added a Log.i(...) to the onStop() method of my activity. Sure enough, onStop() does not get called when I press the off button on my HTC Incred开发者_JAVA百科ible (which turns off the screen).

Is there any way to listen for the lock screen, or the screen turning off, since it doesn't call onStop() like it should?

Thanks.

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onStop is not guaranteed to be called, onPause is. Use onPause to remove GPS updates from eating battery.