로테이션에서 Android 앱이 충돌 함

Question

기기를 회전 할 때마다 앱이 다운되고 그 이유를 알 수 없습니다. 여기에 로그 캣 정보입니다 : 여기

07-26 10:11:48.260: E/AndroidRuntime(25775): FATAL EXCEPTION: main 
07-26 10:11:48.260: E/AndroidRuntime(25775): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cleanlist/com.cleanlist.MainActivity}: java.lang.NullPointerException 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2088) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2113) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3554) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.ActivityThread.access$800(ActivityThread.java:139) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1230) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.os.Looper.loop(Looper.java:137) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.ActivityThread.main(ActivityThread.java:4918) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at java.lang.reflect.Method.invokeNative(Native Method) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at java.lang.reflect.Method.invoke(Method.java:511) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at dalvik.system.NativeStart.main(Native Method) 
07-26 10:11:48.260: E/AndroidRuntime(25775): Caused by: java.lang.NullPointerException 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:330) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.widget.ListView.setAdapter(ListView.java:466) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at com.cleanlist.MainActivity$DummySectionFragment.onCreateView(MainActivity.java:307) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1070) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1861) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:547) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1178) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.Activity.performStart(Activity.java:5058) 
07-26 10:11:48.260: E/AndroidRuntime(25775): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2061) 
07-26 10:11:48.260: E/AndroidRuntime(25775): ... 12 more 

그것에서 문제가있는 코드의 섹션은, 그것은 listView.setAdapter (listadapter)에 대한 문제를 지적;

public static class DummySectionFragment extends Fragment { 
     /** 
     * The fragment argument representing the section number for this 
     * fragment. 
     */ 
     public transient ListObject list; 
     public static final String ARG_SECTION_NUMBER = "section_number"; 
     private View thisView; 
     private MainActivity mainActivity; 
     private CustomListAdapter listadapter; 


     public DummySectionFragment() { 
     } 

     public DummySectionFragment(MainActivity act, CustomListAdapter adp, ListObject thisList) 
     { 
      list = thisList; 
      mainActivity = act; 
      listadapter = adp; 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
     { 
       View rootView = inflater.inflate(R.layout.list_layout, container, false); 

       final int whichList = getArguments().getInt(ARG_SECTION_NUMBER); 

       listadapter = new CustomListAdapter(getActivity(), R.layout.list_row, list); 
       ListView listView = (ListView)rootView.findViewById(R.id.listView); 
       if (listView != null) 
        listView.setAdapter(listadapter); 
       else 
        Log.e("wbbug","ListView is NULL"); 
       listView.setSelection(1); 
       listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
       { 
        @Override 
        public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) 
        { 
         Log.d("wbbug","List item click: " + position + "List size: " + list.size()); 

        } 
       }); 

      thisView = rootView; 
      return rootView; 
     } 

Answer 1

ArrayAdapter getCount 메소드에 널 포인터 예외가 있습니다. 그래서 아마도 당신의 목록은 null이 될 것입니다. 순환 게재에서 활동이 다시 작성되며 목록이 제대로 초기화되지 않을 수 있습니다.