탭을 추가 할 때 NullPointerException이주는 이유는 무엇입니까?

Question

나는 3 개의 탭과 각각의 단편을 가지고있는 응용 프로그램을 만들고 있습니다.하지만 이제는 하나 더 많은 탭을 추가하고 싶지만 추가 할 때 아무런 문제가 없지만 응용 프로그램을 실행할 때 nullpointerexception을 던집니다 .I 왜 그런 일이 일어나고 있는지 모르겠다.

내가 잘못 생각한 부분을 알려주십시오.

이 내 활동하고있는 모든 탭이 있습니다 :

public class MainActivity extends Activity { 
     RelativeLayout rl; 
     PopupWindow popUp; 
     LinearLayout layout; 
     TextView tv; 
     LayoutParams params; 
     LinearLayout mainLayout; 
     Button but; 
     boolean click = true; 

     ActionBar.Tab TabOrder , TabCart,TabHistory; 





     @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
     @SuppressLint("NewApi") 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 

      getOverflowMenu(); 
      rl = (RelativeLayout) findViewById(R.id.mainLayout); 
      //fragMentTra = getFragmentManager().beginTransaction(); 
      ActionBar actionbar = getActionBar(); 
      actionbar.setTitle("Select To Order"); 
      actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 
      //  bar.addTab(bar.newTab().setText("ORDER").setTabListener((TabListener) this)); 
      //  bar.addTab(bar.newTab().setText("CART").setTabListener(this)); 
      //  bar.addTab(bar.newTab().setText("HISTORY").setTabListener(this)); 

      //TabOrder = actionbar.newTab().setText("DEAL"); 
      TabOrder = actionbar.newTab().setText("ORDER"); 
      TabCart = actionbar.newTab().setText("CART"); 
      TabHistory = actionbar.newTab().setText("HISTORY"); 

      //Fragment FragmentDeal = new FragmentDeal(); 
      Fragment FragmentOrder = new FragmentOrder(); 
      Fragment FragmentCart = new FragmentCart(); 
      Fragment FragmentHistory = new FragmentHistory(); 


      //TabOrder.setTabListener(new MyTablistenerClass(FragmentDeal)); 
      TabOrder.setTabListener(new MyTablistenerClass(FragmentOrder)); 
      TabCart.setTabListener(new MyTablistenerClass(FragmentCart)); 
      TabHistory.setTabListener(new MyTablistenerClass(FragmentHistory)); 


      //actionbar.addTab(TabDeal); 
      actionbar.addTab(TabOrder); 
      actionbar.addTab(TabCart); 
      actionbar.addTab(TabHistory); 
} 

     private void getOverflowMenu() { 

      try { 
       ViewConfiguration config = ViewConfiguration.get(this); 
       Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey"); 
       if(menuKeyField != null) { 
        menuKeyField.setAccessible(true); 
        menuKeyField.setBoolean(config, false); 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 

FragmentOrder

 @SuppressLint({ "ValidFragment", "NewApi" }) 
     public class FragmentOrder extends Fragment{ 


      @Override 
      public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 
       //View view = inflater.inflate(R.layout.g, null); 
       View view = inflater.inflate(R.layout.gridview,null); 
       final GridView listView = (GridView) view.findViewById(R.id.mainGrid); 
       listView.setAdapter(new OrderAdapter()); 
       //listView.setSelection(setselected,true); 
       listView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL); 

       listView.setMultiChoiceModeListener(new MultiChoiceModeListener() { 


        @Override 
        public boolean onActionItemClicked(ActionMode mode, 
          MenuItem item) { 
         // TODO Auto-generated method stub 
         return true; 
        } 

        @Override 
        public boolean onCreateActionMode(ActionMode mode, Menu menu) { 
         mode.setTitle("Select Items"); 
         mode.setSubtitle("One item selected"); 
         return true; 

        } 

        @Override 
        public void onDestroyActionMode(ActionMode mode) { 
         // TODO Auto-generated method stub 

        } 

        @Override 
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) { 
         // TODO Auto-generated method stub 
         return false; 
        } 

        @Override 
        public void onItemCheckedStateChanged(ActionMode mode, 
          int position, long id, boolean checked) { 

         //listView.setLongClickable(false); 
         int selectCount = listView.getCheckedItemCount(); 
         switch (selectCount) { 
         case 1: 
          mode.setSubtitle("One item selected"); 
          break; 
         default: 
          mode.setSubtitle("" + selectCount +"items selected"); 
          break; 

         } 
        } 
       }); 


       return view; 
      } 
     } 

OrderAdapter

 private class OrderAdapter extends BaseAdapter { 

      @Override 
      public int getCount() { 
       return mThumbIds.length; 
      } 

      @Override 
      public Object getItem(int position) { 
       return null; 
      } 

      @Override 
      public long getItemId(int position) { 
       // TODO Auto-generated method stub 
       return 0; 
      } 

      @Override 
      public View getView(int position, View convertView, ViewGroup parent) { 

       //CheckableLayout l; 

       View myView = convertView; 

       LayoutInflater inflater = (LayoutInflater)MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);   
       myView = inflater.inflate(R.layout.grid_items_ontap, null); 


       // Add The Image!!!   
       ImageView iv = (ImageView)myView.findViewById(R.id.grid_item_image_OnTap); 
       iv.setImageResource(mThumbIds[position]); 


       // Add The Text!!! 
       TextView tv = (TextView)myView.findViewById(R.id.grid_item_text_onTap); 
       tv.setText(names[position]); 

       return myView; 
      } 
     } 

     private Integer[] mThumbIds = { 
       R.drawable.car, R.drawable.car, 
       R.drawable.car, R.drawable.car, 
       R.drawable.car,R.drawable.car,R.drawable.car,R.drawable.car, R.drawable.car, 
       R.drawable.car, R.drawable.car, 
       R.drawable.car,R.drawable.car,R.drawable.car 
     }; 

     private String[] names={"ab","cd","ef","gh","ij","kl","mn","","","","","","",""}; 

조각 역사

 @SuppressLint("ValidFragment") 
     public class FragmentHistory extends Fragment{ 

      @Override 
      public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 

       View layout = inflater.inflate(R.layout.activity_fragmenthistory, 
         (ViewGroup) 
         findViewById(R.id.layout_root_history)); 


       ListView lv = (ListView) layout.findViewById(R.id.listViewHistory); 
       lv.setAdapter(new HistoryListViewAdapter(MainActivity.this)); 

       lv.setOnItemClickListener(new OnItemClickListener() { 

        @Override 
        public void onItemClick(AdapterView<?> arg0, View view, int position, 
          long id) { 
         // TODO Auto-generated method stub 

         AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this); 


         dlg.setTitle("ORDERID"); 

         dlg.setPositiveButton("REORDER",new DialogInterface.OnClickListener() { 

          @Override 
          public void onClick(DialogInterface dialog, int which) { 
           // TODO Auto-generated method stub 
          } 

         }) 

         .setNegativeButton("EDIT AND ORDER", new DialogInterface.OnClickListener() { 

          @Override 
          public void onClick(DialogInterface dialog, int which) { 
           // TODO Auto-generated method stub 

          } 
         }); 

         ListView listView = new ListView(MainActivity.this); 

         listView.setAdapter(new DialogListAdapter(MainActivity.this)); 

         dlg.setView(listView); 
         //((Dialog) dlg).setCanceledOnTouchOutside(true); 
         // show it 
         dlg.show(); 

        } 

       }); 

       return layout; 
      } 
     } 

FragmentCart

 @SuppressLint("ValidFragment") 
     public class FragmentCart extends Fragment{ 

      @Override 
      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
       View layout = inflater.inflate(R.layout.activity_fragmentcart, 
         (ViewGroup) 
         findViewById(R.id.layout_root_cart)); 


       ListView lv = (ListView) layout.findViewById(R.id.listViewCart); 
       lv.setAdapter(new CartListViewAdapter(MainActivity.this)); 

       //lv.invalidateViews(); 


       return layout; 
      } 

     } 

내가 problem.FragmentDeal에 직면하고 tabdeal 추가에

 @SuppressLint("ValidFragment") 
     public class FragmentDeal extends Fragment{ 


      @Override 
      public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 

       View layout = inflater.inflate(R.layout.fragmentdeal, 
         (ViewGroup) 
         findViewById(R.id.layoutdeal)); 


       //View view = inflater.inflate(R.layout.griddeal,null); 
       final GridView listView = (GridView) layout.findViewById(R.id.GridDeal); 
       listView.setAdapter(new DealAdapter()); 

       listView.setOnItemClickListener(new OnItemClickListener() { 

        @Override 
        public void onItemClick(AdapterView<?> arg0, View arg1, 
          int arg2, long arg3) { 
         // TODO Auto-generated method stub 

        } 
       }); 

       return layout; 
       // TODO Auto-generated method stub 


      } 
     } 

     private class DealAdapter extends BaseAdapter { 

      @Override 
      public int getCount() { 
       return mThumbIds1.length; 
      } 

      @Override 
      public Object getItem(int position) { 
       return null; 
      } 

      @Override 
      public long getItemId(int position) { 
       // TODO Auto-generated method stub 
       return 0; 
      } 

      @Override 
      public View getView(int position, View convertView, ViewGroup parent) { 

       //CheckableLayout l; 

       View myView = convertView; 

       LayoutInflater inflater = (LayoutInflater)MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);   
       myView = inflater.inflate(R.layout.griddealitems, null); 


       // Add The Image!!!   
       ImageView iv = (ImageView)myView.findViewById(R.id.grid_deal_image); 
       iv.setImageResource(mThumbIds1[position]); 


       // Add The Text!!! 
       TextView tv = (TextView)myView.findViewById(R.id.grid_deal_text); 
       tv.setText(names1[position]); 




       return myView; 
      } 
      private Integer[] mThumbIds1 = { 
        R.drawable.car, R.drawable.car, 
        R.drawable.car, R.drawable.car 

      }; 

      private String[] names1={"ab","cd","ef","gh"}; 
     } 
     @Override 
     public boolean onCreateOptionsMenu(Menu menu) { 
      MenuInflater inflater = getMenuInflater(); 
      inflater.inflate(R.menu.main, menu); 
      return true; 

     } 



     public boolean onOptionsItemSelected(MenuItem item){ 

      switch(item.getItemId()){ 
      case R.id.action_settings: 
       Intent intentForSettings = new Intent(MainActivity.this, SettingsMenu.class); 
       startActivity(intentForSettings); 
       return true; 

      case R.id.action_info: 
       Intent intentForInformation = new Intent(MainActivity.this,InformationMenu.class); 
       startActivity(intentForInformation); 
       return true; 

      case R.id.action_ContactUs: 
       Intent dial = new Intent(); 
       String no = "9579839314"; 
       dial.setAction("android.intent.action.DIAL"); 
       dial.setData(Uri.parse("tel:"+ no)); 
       startActivity(dial); 
       return true; 

      } 
      return false; 

     } 

     public class MyTablistenerClass implements android.app.ActionBar.TabListener { 

      Fragment fragment1; 

      @SuppressLint("NewApi") 
      public MyTablistenerClass(Fragment fragment){ 
       this.fragment1 = fragment; 
      } 


      @Override 
      public void onTabReselected(Tab tab, FragmentTransaction ft) { 
       // TODO Auto-generated method stub 

      } 
      @Override 
      public void onTabSelected(Tab tab, FragmentTransaction ft) { 
       // TODO Auto-generated method stub 


       FragmentTransaction fragMentTra; 
       if (tab.getText().equals("DEAL")) { 
        try { 
         rl.removeAllViews(); 
        } catch (Exception e) { 
        } 
       FragmentDeal Fram1 = new FragmentDeal(); 
        //fragMentTra.addToBackStack(null); 
        fragMentTra = getFragmentManager().beginTransaction(); 
        fragMentTra.add(rl.getId(), Fram1); 
        fragMentTra.commit(); 
       } 
       else if (tab.getText().equals("ORDER")) { 
        try { 
         rl.removeAllViews(); 
        } catch (Exception e) { 
        } 
        FragmentOrder Fram2 = new FragmentOrder(); 
        //fragMentTra.addToBackStack(null); 
        fragMentTra = getFragmentManager().beginTransaction(); 
        fragMentTra.add(rl.getId(), Fram2); 
        fragMentTra.commit(); 
       } 

       else if(tab.getText().equals("CART")){ 
        try { 
         rl.removeAllViews(); 
        } catch (Exception e) { 
        } 
        FragmentCart fram3 = new FragmentCart(); 
        //fragMentTra.addToBackStack(null); 
        fragMentTra = getFragmentManager().beginTransaction(); 
        fragMentTra.add(rl.getId(), fram3); 
        fragMentTra.commit(); 
       } 



       else if(tab.getText().equals("HISTORY")){ 
        try { 
         rl.removeAllViews(); 
        } catch (Exception e) { 
        } 
        FragmentHistory fram4 = new FragmentHistory(); 
        //fragMentTra.addToBackStack(null); 
        fragMentTra = getFragmentManager().beginTransaction(); 
        fragMentTra.add(rl.getId(), fram4); 
        fragMentTra.commit(); 
       } 

      } 
      @Override 
      public void onTabUnselected(Tab tab, FragmentTransaction ft) { 
       // TODO Auto-generated method stub 

      } 

     } 
    } 

가 FragmentDeal 각각의 Fragment.If의 아무도 내가 어디 오전 볼 수 있습니다 잘못 말해줘. 감사합니다. .

Answer 1

//TabOrder = actionbar.newTab().setText("DEAL"); 
TabOrder = actionbar.newTab().setText("ORDER"); 

두 탭을 모두 TabOrder으로 설정했습니다. 첫 번째를 TabDeal으로 설정하십시오.

편집 :

ActionBar.Tab TabOrder , TabCart,TabHistory; 

그리고 그런데

는 보통 클래스 이름은 대문자로 시작 : 물론
당신이 또한 너무 여기 TabDeal를 초기화해야합니다. 이것은 나를 혼란스럽게 만든다.