logcat內容備份 android真機調試時，按手機返回鍵，logcat出現提示，如下：
01-22 10:38:52.697: I/ViewRootImpl(30206): WindowInputEventReceiver onInputEvent!! KeyCode is 4, action is 001-22 10:38:52.702: I/ViewRootImpl(30206): WindowInputEventReceiver onInputEvent!! KeyCode is 4, action is 1新聞熱點
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