Android AsyncTask使用套接字發送/讀取數據

我正在測試項目，就像使用Wi-Fi連接的基本聊天程序。我創建套接字來連接兩個不同的設備，但我的問題是，當我發送第一條消息時，它顯示在另一個設備上。但是如果我嘗試再次發送，我可以在第一個日誌中看到該消息已發送，但從未在第二個設備中顯示。Android AsyncTask使用套接字發送/讀取數據

我試圖在另一個線程中執行讀取接收到的數據或在異步任務中，但問題仍然存在。下面是我實現的兩種方式：

單線程：

public void listenForSocket(){ 
    thread = new Thread(new Runnable() { 
     public void run() { 
      Log.e("READDATAFROMSOCKET","READDATAFROMSOCKET"); 
      try { 
       // sets the service running state to true so we can get it's state from other classes and functions.      
       serverSocket = new ServerSocket(DNSUtils.port); 
       client = serverSocket.accept(); 
       client.setKeepAlive(true); 
       InputStream is = client.getInputStream(); 
       Log.d("","is Size : "+is.available()); 
       BufferedReader in = new BufferedReader(new InputStreamReader(is)); 
       int readed = in.read(); 
       Log.d("","readed bytes : "+readed); 
       String line = ""; 
       while ((line = in.readLine()) != null) { 
        Log.i("","line : "+line); 
        changeText(line); 
       } 

       //client.close(); 
       //serverSocket.close(); 
      } catch (UnknownHostException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 
    thread.start(); 
}

而這裏的AsyncTask：

class ServerTask extends AsyncTask<Void, Void, Void>{ 

    private String line = ""; 

    @Override 
    protected Void doInBackground(Void... params) { 
     try { 
      Log.e("ASYNCTASK","ASYNCTASK"); 
      // sets the service running state to true so we can get it's state from other classes and functions.      
      serverSocket = new ServerSocket(DNSUtils.port); 
      client = serverSocket.accept(); 
      client.setKeepAlive(true); 
      InputStream is = client.getInputStream(); 

      Log.d("","is Size : "+is.available()); 
      BufferedReader in = new BufferedReader(new InputStreamReader(is)); 
      int readed = in.read(); 
      Log.d("","readed bytes : "+readed); 

      while ((line = in.readLine()) != null) { 
       Log.i("","line : "+line);     
      } 

      //client.close(); 
      //serverSocket.close(); 
     } catch (UnknownHostException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void result) { 
     super.onPostExecute(result); 
     changeText(line); 
    } 
}

changeText（字符串）; -

private void changeText(final String line) { 
    runOnUiThread(new Runnable() { 
     @Override 
     public void run() { 
      LinearLayout.LayoutParams params = new LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); 
      params.gravity = Gravity.RIGHT; 
      TextView sendMsg = new TextView(MainActivity.this); 
      sendMsg.setText(DNSUtils.clientName+" : "+line); 
      sendMsg.setTextColor(Color.DKGRAY); 
      sendMsg.setTextSize(18); 
      layout.addView(sendMsg, params); 
     } 
    }); 
}

任何想法如何解決這個問題？

而另一個問題是，當我讀取收到的數據時，發送的字符串的第一個字母從不顯示。它總是從第二個字母開始。

在此先感謝。

來源

2012-07-30 hardartcore

我認爲後臺服務更符合您的需求。只要您的「活動」與其綁定，它就會保持活力。它在完成代碼後不會完成，比如你的'Threads'或'AsyncTasks' – tolgap 2012-07-30 15:38:07

如果我是你，我會嘗試用serverSocket = new ServerSocket(DNSUtils.port);只用一次;不是在每個線程中。

來源

2012-07-30 15:44:33

Android AsyncTask使用套接字發送/讀取數據

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