对于WatchDogService中Class.getName() 报空值 null object reference

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java.lang.RuntimeException: Unable to start service com.shihoo.daemon.watch.WatchDogService@c63a66b with Intent { cmp=com.example.hexcapture/com.shihoo.daemon.watch.WatchDogService }: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Class.getName()' on a null object reference

对于每次运行的时候，WatchDogService中的onStart()方法中，最后设置启用状态时：WatchProcessPrefHelper.mWorkServiceClass.getName()一直报上面的错