如题，android 如何判断当前处于熄屏状态？
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There is a system broadcast when the screen is off and on, and the corresponding broadcast action is Intent.ACTION_SCREEN_OFF和Intent.ACTION_SCREEN_ON
Intent.ACTION_SCREEN_OFF
Intent.ACTION_SCREEN_ON
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There is a system broadcast when the screen is off and on, and the corresponding broadcast action is
Intent.ACTION_SCREEN_OFF和Intent.ACTION_SCREEN_ON