InvocationTargetException - Recycler View - Android綁定服務

嗨，我正在開發一個聊天應用程序。我有一個Recyclerview來顯示可用的用戶。InvocationTargetException - Recycler View - Android綁定服務

我使用的是綁定的服務，當過新用戶加入我的服務將推動細節receivedincommingchats方法在我MainFragment類。

我想更新我的Recyclerview埃夫裏時間我收到新的用戶信息到receivedincommingchats方法。我能夠從服務中接收用戶信息。

但是，當我嘗試更新從Recyclerview收到組織方法我得到的錯誤。

 :: HubConnection - Error: java.lang.reflect.InvocationTargetException 
java.lang.reflect.InvocationTargetException 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at microsoft.aspnet.signalr.client.hubs.HubProxy$1.run(HubProxy.java:158) 
    at microsoft.aspnet.signalr.client.hubs.HubProxy$1.run(HubProxy.java:1) 
    at microsoft.aspnet.signalr.client.hubs.Subscription.onReceived(Subscription.java:31) 
    at microsoft.aspnet.signalr.client.hubs.HubProxy.invokeEvent(HubProxy.java:308) 
    at microsoft.aspnet.signalr.client.hubs.HubConnection.onReceived(HubConnection.java:118) 
    at microsoft.aspnet.signalr.client.transport.TransportHelper.processReceivedData(TransportHelper.java:96) 
    at microsoft.aspnet.signalr.client.Connection.processReceivedData(Connection.java:733) 
    at microsoft.aspnet.signalr.client.Connection.access$0(Connection.java:728) 
    at microsoft.aspnet.signalr.client.Connection$10.onData(Connection.java:671) 
    at microsoft.aspnet.signalr.client.transport.ServerSentEventsTransport$1.onResponse(ServerSentEventsTransport.java:104) 
    at microsoft.aspnet.signalr.client.http.java.NetworkRunnable.run(NetworkRunnable.java:82) 
    at java.lang.Thread.run(Thread.java:841) 
Caused by: java.lang.NullPointerException 
    at zupportdesk.desk.zupport.chatsystem.fragment.MainFragment.receivedincommingchats(MainFragment.java:134) 
at zupportdesk.desk.zupport.chatsystem.Services.SignalRService$3.recieveIncomingChat(SignalRService.java:121) 
08-25 16:12:52.227 21843-22276/zupportdesk.desk.zupport.chatsystem W/System.err: ... 14 more

MainFragment.class

public class MainFragment extends Fragment { 

    private boolean mSearchCheck; 
    private static final String TEXT_FRAGMENT = "TEXT_FRAGMENT"; 

    private RecyclerView recyclerView; 
    private LinearLayoutManager layoutManager; 
    private IncommingChatsAdapter adapter; 
    List<IncommingItomObject> items = new ArrayList<IncommingItomObject>(); 


    public static MainFragment newInstance(String text){ 
     MainFragment mFragment = new MainFragment(); 
     Bundle mBundle = new Bundle(); 
     mBundle.putString(TEXT_FRAGMENT, text); 
     mFragment.setArguments(mBundle); 
     return mFragment; 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     View rootView = inflater.inflate(R.layout.fragment_main, container, false); 
     recyclerView = (RecyclerView) rootView.findViewById (R.id.recycler_view_chats); 
     recyclerView.addItemDecoration(new SimpleDividerItemDecoration(rootView.getContext())); 
     layoutManager = new LinearLayoutManager(rootView.getContext()); 
     recyclerView.setLayoutManager(layoutManager); 
     int country_cd = R.drawable.lk; 

     items.add(new IncommingItomObject(country_cd, "name", "visitor")); 
     items.add(new IncommingItomObject(country_cd, "Sathyabaman", "Vid123456789-15236544-542")); 
     adapter = new IncommingChatsAdapter(getContext(), items); 

     recyclerView.setAdapter(adapter); 
     Log.d("recyclerview", "on create fragment"); 



     rootView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));  
     return rootView;   
    } 

    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onActivityCreated(savedInstanceState); 
     setHasOptionsMenu(true); 
    } 

    @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
     // TODO Auto-generated method stub 
     super.onCreateOptionsMenu(menu, inflater); 
     inflater.inflate(R.menu.menu, menu); 

     //Select search item 
     final MenuItem menuItem = menu.findItem(R.id.menu_search); 
     menuItem.setVisible(true); 

     SearchView searchView = (SearchView) menuItem.getActionView(); 
     searchView.setQueryHint(this.getString(R.string.search)); 

     ((EditText) searchView.findViewById(R.id.search_src_text)) 
       .setHintTextColor(getResources().getColor(R.color.nliveo_white)); 
     searchView.setOnQueryTextListener(onQuerySearchView); 

     menu.findItem(R.id.menu_add).setVisible(true); 

     mSearchCheck = false; 
    } 


    public void receivedincommingchats(RecieveIncomingchats recieveIncomingchats){ 

     int country_cd = 0; 
     Log.d("MFrag_visitor_id:", recieveIncomingchats.getVisitorID()); 
     Log.d("MFrag_company_id:", recieveIncomingchats.getCompanyId()); 
     Log.d("MFrag_name:", recieveIncomingchats.getName()); 
     Log.d("MFrag_widget_id:", recieveIncomingchats.getWidgetId()); 
     Log.d("MFrag_country_code:", String.valueOf(recieveIncomingchats.getCountryCode())); 

     String country = recieveIncomingchats.getCountryCode(); 
     String name = recieveIncomingchats.getName(); 
     String visitor = recieveIncomingchats.getVisitorID(); 
     country_cd = R.drawable.lk; 


      items.add(new IncommingItomObject(country_cd, "From service", "Coming from service")); 
      adapter = new IncommingChatsAdapter(getContext(), items); 
      recyclerView.setAdapter(adapter); 
      Log.d("recyclerview", "After results received from service"); 



    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // TODO Auto-generated method stub 

     switch (item.getItemId()) { 

     case R.id.menu_add: 
      Toast.makeText(getActivity(), R.string.add, Toast.LENGTH_SHORT).show(); 
      break; 

     case R.id.menu_search: 
      mSearchCheck = true; 
      Toast.makeText(getActivity(), R.string.search, Toast.LENGTH_SHORT).show(); 
      break; 
     } 
     return true; 
    } 

    private SearchView.OnQueryTextListener onQuerySearchView = new SearchView.OnQueryTextListener() { 
     @Override 
     public boolean onQueryTextSubmit(String s) { 
      return false; 
     } 

     @Override 
     public boolean onQueryTextChange(String s) { 
      if (mSearchCheck){ 
       // implement your search here 
      } 
      return false; 
     } 
    }; 
}

有人可以幫助我的信息接收方法後，從綁定的服務，每次更新Recyclerview。

來源

2016-08-25 Sathya Baman

行號有一個'NullPointerException'在'receivedincommingchats' 134. – SripadRaj

是在那個方法裏面這行'recyclerView.setAdapter（adapter）;'。但我已經加載可用的創建可回收。但是當我嘗試在該方法內更新它時會出現問題。 –

嘗試直接在項目列表中添加新數據，然後請求更新。而不是

items.add(new IncommingItomObject(country_cd, "From service", "Coming from service")); 
adapter = new IncommingChatsAdapter(getContext(), items); 
recyclerView.setAdapter(adapter);

，你可以在你的適配器添加一個方法，像這樣

public void addItem(IncommingItomObject obj) { 
     items.add(obj); 
     notifyDataSetChanged(); 
    }

，並調用它在你的receivedincommingchats方法

來源

2016-08-25 11:54:09 firegloves

InvocationTargetException - Recycler View - Android綁定服務

回答

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