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  1. 09-02 18:00:20.189 336-336/? E/AndroidRuntime: FATAL EXCEPTION: main
  2. Process: com.example.develop89.button, PID: 336
  3. java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.develop89.button/com.example.develop89.button.index}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
  4. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2337)
  5. at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
  6. at android.app.ActivityThread.-wrap11(ActivityThread.java)
  7. at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
  8. at android.os.Handler.dispatchMessage(Handler.java:102)
  9. at android.os.Looper.loop(Looper.java:148)
  10. at android.app.ActivityThread.main(ActivityThread.java:5443)
  11. at java.lang.reflect.Method.invoke(Native Method)
  12. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
  13. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
  14. Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
  15. at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:118)
  16. at android.support.v7.app.AppCompatDelegateImplV9.<init>(AppCompatDelegateImplV9.java:152)
  17. at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:29)
  18. at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:53)
  19. at android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:31)
  20. at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:202)
  21. at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:184)
  22. at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:518)
  23. at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:189)
  24. at com.example.develop89.button.index.<init>(index.java:12)
  25. at java.lang.Class.newInstance(Native Method)
  26. at android.app.Instrumentation.newActivity(Instrumentation.java:1090)
  27. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
  28. at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490) 
  29. at android.app.ActivityThread.-wrap11(ActivityThread.java) 
  30. at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354) 
  31. at android.os.Handler.dispatchMessage(Handler.java:102) 
  32. at android.os.Looper.loop(Looper.java:148) 
  33. at android.app.ActivityThread.main(ActivityThread.java:5443) 
  34. at java.lang.reflect.Method.invoke(Native Method) 
  35. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
  36. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
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