Android screen never turns off

I have a problem with my Android app, it doesn't seem to let the screen turn off ever. What could be the cause for it? isn't the screen suppo开发者_如何学编程sed to turn off depending on the user's settings?

Thanks for your help!

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Are you sure none of your views uses android:keepScreenOn

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If you mean when it's connected to your dev PC via USB, then perhaps you can check whether Settings/Applications/Development/Stay Awake is set?