直到您開始滾動，Recycler視圖纔會更新

Question

我正在聊天。收到併發送郵件時，我無法顯示郵件。只有當我滾動此表時，纔會顯示新消息。如果您使用scrollToPosition (0)方法，則一切正常。但在這種情況下，頁面將滾動，並在收到對話者的消息時，這是不可接受的。我一直在處理這個問題大概一個星期，我無法修復它。我會很樂意提供任何幫助。我括的代碼：

適配器初始化：

MessagesListAdapter<IMessage> adapter; 
... 
adapter = new MessagesListAdapter<IMessage>(user.getUser_id(), imageLoader); 

WebSocketListener（用於消息recieving）：

webSocket.addListener(new WebSocketListener() { 
      ... 

      @Override 
      public void onFrame(WebSocket websocket, WebSocketFrame frame) throws Exception { 
       Log.i("fg", "onFrame"); 
       JSONObject data = new JSONObject(frame.getPayloadText()); 
       Log.i("fg", "data: " + data.toString()); 

       if (data.has("data")) { 

        switch (data.getString("type")) { 
         case "Text": 
          Log.i("fg", "type text"); 
          MyMessage myMessage = new MyMessage(data.getString("user_id"), data.getString("data"), 
            data.getString("login"), data.getString("unix_time"), data.getString("user_id"), data.getString("avatar")); 
          Log.i("fg", "before " + Integer.toString(adapter.getItemCount())); 
          adapter.addToStart(myMessage, true); 
          adapter.notifyDataSetChanged(); 
          break; 
         case "Location": 
          Log.i("fg", "type location"); 
          MyLocationMessage myLocationMessage = new MyLocationMessage(data.getString("user_id"), data.getString("data"), 
            data.getString("login"), data.getString("unix_time"), data.getString("user_id"), data.getString("avatar")); 
          Log.i("fg", "before " + Integer.toString(adapter.getItemCount())); 
          adapter.addToStart(myLocationMessage, true); 
          adapter.notifyDataSetChanged(); 
          break; 
         case "Photo": 
          Log.i("fg", "was here images"); 
          MyImageMessage myImageMessage = new MyImageMessage(data.getString("user_id"), data.getString("data"), 
            data.getString("login"), data.getString("unix_time"), data.getString("user_id"), data.getString("avatar")); 
          Log.i("fg", "before " + Integer.toString(adapter.getItemCount())); 
          adapter.addToStart(myImageMessage, true); 
          adapter.notifyDataSetChanged(); 
          break; 
        } 
       } 
       adapter.notifyDataSetChanged(); 
       adapter.notifyItemRangeChanged(0, adapter.getItemCount()); 


      } 

適配器：

public MessagesListAdapter(String senderId, ImageLoader imageLoader) { 
     this(senderId, new MessageHolders(), imageLoader); 
    } 

    /** 
    * For default list item layout and view holder. 
    * 
    * @param senderId identifier of sender. 
    * @param holders  custom layouts and view holders. See {@link MessageHolders} documentation for details 
    * @param imageLoader image loading method. 
    */ 
    public MessagesListAdapter(String senderId, MessageHolders holders, 
           ImageLoader imageLoader) { 
     this.senderId = senderId; 
     this.holders = holders; 
     this.imageLoader = imageLoader; 
     this.items = new ArrayList<>(); 
    } 

    @Override 
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     return holders.getHolder(parent, viewType, messagesListStyle); 
    } 

    @SuppressWarnings("unchecked") 
    @Override 
    public void onBindViewHolder(ViewHolder holder, int position) { 
     // Log.i("fg","onBindViewHolder position: " + Integer.toString(position)); 
     Wrapper wrapper = items.get(position); 
     holders.bind(holder, wrapper.item, wrapper.isSelected, imageLoader, 
       getMessageClickListener(wrapper), 
       getMessageLongClickListener(wrapper), 
       dateHeadersFormatter); 


    } 

    public int getMessagesCount(){ 
     int count = 0; 
     for(int i = 0; i < items.size(); i++){ 
      Wrapper wrapper = items.get(i); 
      if (wrapper.item instanceof IMessage) { 
       count++; 
      } 
     } 
     return count; 
    } 


    @Override 
    public int getItemCount() { 
     return items.size(); 
    } 

    @Override 
    public int getItemViewType(int position) { 
     // Log.i("fg", "position: " + Integer.toString(position)); 
     return holders.getViewType(items.get(position).item, senderId); 
    } 

public void addToStart(MESSAGE message, boolean scroll) { 
     boolean isNewMessageToday = !isPreviousSameDate(0, message.getCreatedAt()); 
     if (isNewMessageToday) { 
      items.add(0, new Wrapper<>(message.getCreatedAt())); 
     } 
     Wrapper<MESSAGE> element = new Wrapper<>(message); 
     items.add(0, element); 
     notifyItemRangeInserted(0, isNewMessageToday ? 2 : 1); 
     if (layoutManager != null && scroll) { 
      layoutManager.scrollToPosition(0); 
     } 
    } 

ХML與郵件列表：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    tools:context="com.example.uncolor.aroundme.Dialog"> 

    <FrameLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_weight="1"> 

     <Button 
      android:id="@+id/buttonLoadMore" 
      android:layout_width="wrap_content" 
      android:layout_height="24dp" 
      android:layout_gravity="center|top" 
      android:background="@color/transparent" 
      android:gravity="center" 
      android:text="@string/previous_messages" 
      android:textAllCaps="false" 
      android:textColor="@color/colorPrevMsgs" 
      android:textSize="18sp" /> 

     <com.stfalcon.chatkit.messages.MessagesList 
      android:id="@+id/messagesList" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_margin="0dp" 
      android:paddingTop="30dp" 
      android:paddingBottom="15dp" 
      android:clipToPadding="false" 
      android:layout_marginBottom="0dp" 
      android:layout_marginTop="8dp" 
      app:layout_constraintTop_toTopOf="parent"> 

     </com.stfalcon.chatkit.messages.MessagesList> 

    </FrameLayout> 

我使用這個庫ChatKit for Android

Answer 1

也許問題在於onFrame方法是在UI線程沒有運行。這樣你可以在UI中應用更改。你可以在這裏嘗試Handler。