Android的service报错空指针异常？on a null object reference

提示我说该服务空指针异常，

• 错误如下：

java.lang.RuntimeException: Unable to create service com.example.servicetest.MyService: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3204)
        at android.app.ActivityThread.-wrap5(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1570)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6176)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:893)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
        at android.app.Notification$Builder.(Notification.java:2351)
        at android.app.Notification$Builder.(Notification.java:2340)
        at com.example.servicetest.MyService.onCreate(MyService.java:30)
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3194)
        at android.app.ActivityThread.-wrap5(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1570) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6176) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:893) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783) 

检查一下 是不是在 Manifest 里面忘记注册了