pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);boolean screen = pm.isScreenOn();
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如果你要监听屏幕开关的事件的话, 你需要监听这个两个ACTION_SCREEN_OFF and ACTION_SCREEN_ON intent broadcast
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ref:http://stackoverflow.com/questions/7529733/how-to-discover-if-the-screen-is-on-or-off-while-developping-in-android