从套接字内更新视图.IO线程

Question

我想是时候问我的stackoverbros.一个问题了。我使用socket.io-client.java https://github.com/nkzawa/socket.io-client.java与使用socket.io的节点服务器通信。到目前为止，连接工作正常。

这里是onCreate和变量定义。

    class Text
{
    String username;
    String message;
}
Socket socket;
ListView listView;
ArrayList<Text> texts = new ArrayList<Text>();
String username = "";
@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listView = (ListView) findViewById(R.id.listView);
    initList();
    activateEnter();
    try {
        startSocket();
    } catch (URISyntaxException e) {
        e.printStackTrace();
    }
}

创建套接字的函数。

    private void startSocket() throws URISyntaxException
{
    socket = IO.socket("http://localhost");
    socket.on(Socket.EVENT_CONNECT, new Emitter.Listener() 
    {
      @Override
      public void call(Object... args) 
      {
        socket.emit("adduser", "");
      }
    }).on("chat_msg", new Emitter.Listener() 
    {
      @Override
      public void call(Object... args) 
      {
          JSONObject obj = (JSONObject)args[0];
          try {
            String uname = obj.getString("username");
            String msg = obj.getString("msg");
            updateList(uname, msg);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
      }
    }).on("username", new Emitter.Listener() 
    {
          @Override
          public void call(Object... args) 
          {
              JSONObject obj = (JSONObject)args[0];
              try {
                username = obj.getString("username");
            } catch (JSONException e) {
                e.printStackTrace();
            }
          }
    }).on(Socket.EVENT_DISCONNECT, new Emitter.Listener() 
    {
      @Override
      public void call(Object... args) 
      {
      }
    });
    socket.connect();
}

现在，我有了一个聊天功能，聊天消息进入一个ListView与一个自定义适配器，我创建的套接字函数之外，像这样。

class FancyAdapter extends ArrayAdapter<Text>
{
     FancyAdapter()
     {
         super(MainActivity.this, android.R.layout.simple_list_item_1, texts);
     }
     public View getView(int position, View convertView, ViewGroup parent)
     {
         ViewHolder holder;
         if(convertView == null)
         {
             LayoutInflater inflater = getLayoutInflater();
             convertView = inflater.inflate(R.layout.text, null);
             holder = new ViewHolder(convertView);
             convertView.setTag(holder);
         }
         else
         {
             holder = (ViewHolder) convertView.getTag();
         }
         holder.populateFrom(texts.get(position));
         return(convertView);
     }
}
class ViewHolder
{
     public TextView text_username = null;
     public TextView text_message = null;
     ViewHolder(View row)
     {
         text_username = (TextView) row.findViewById(R.id.text_username);
         text_message = (TextView) row.findViewById(R.id.text_message);
     }
     void populateFrom(Text w)
     {
         text_username.setText(w.username);
         text_message.setText(w.message);
     }
}
FancyAdapter adapter = null;
private void initList()
{
      adapter = new FancyAdapter();
      listView.setAdapter(adapter);
}
private void updateList(String uname, String message)
{
    Text text = new Text();
    text.username = uname;
    text.message = message;
    texts.add(text); 
    adapter.notifyDataSetChanged();
}

现在，当我调用updateList(string, string)从套接字调用，特别是"chat_message"，我得到"ViewRootImpl$ calledfromwrongthreadeexception只有原来的线程，创建一个视图层次结构可以触摸它的视图。"

哦，好吧，我试着在套接字函数的EVENT_CONNECT事件中移动列表/适配器相关的函数和类，但似乎在那里定义的东西不会为"chat_message"等其他事件定义。

所以我不知道该怎么做。

Answer 1

你只能通过UI线程与视图交互。

MyActivity.this.runOnUiThread(new Runnable() {
      @Override
      public void run() {
          updateList(uname, msg);
      }
});