did not call through to super.onCreate()

android.util.SuperNotCalledException: Activity {com.xkyiliao.xkhospital/com.xkyiliao.xkhospital.activity.Act_HealthManagement} did not call through to super.onCreate()
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2412)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2518)
    at android.app.ActivityThread.access$800(ActivityThread.java:153)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1408)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5429)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:947)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:742)

經檢查，原來是Activity的onCreate(Bundle savedInstanceState)里面沒有寫：

super.onCreate(savedInstanceState);