Android的TCP/IP連接

Question

我有一個關於通過TCP/IP在兩個android設備之間的消息傳遞的問題。問題是我無法發送任何消息到第二個Android設備。當我輸入第一個設備的本地IP時，我可以向自己發送消息。這裏是我的服務器和客戶端類：

服務器類：

公共類ServerThread實現Runnable {

 public void run() { 
      try { 
       if (SERVERIP != null) { 
        handler.post(new Runnable() { 
         @Override 
         public void run() { 
          //serverStatus.setText("Listening on IP: " + SERVERIP); 
         } 
        }); 
        serverSocket = new ServerSocket(8080); 
        while (true) { 
         // listen for incoming clients 
         Socket client = serverSocket.accept(); 

         handler.post(new Runnable() { 
          @Override 
          public void run() { 
           //serverStatus.setText("Connected."); 
          } 
         }); 

         try { 
         BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream())); 

         String line = null; 
          while ((line = in.readLine()) != null) { 

           final String a=line.toString(); 
           Log.d("ServerActivity", line); 
           handler.post(new Runnable() { 
            @Override 
            public void run() { 


             thelist.add(a); 
             ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getApplicationContext(),R.layout.chat_view, R.id.chat_view_label, thelist); 
             lvMessage.setAdapter(arrayAdapter); 
             //onStop();     
             try { 
              serverSocket.close(); 
             } catch (IOException e) { 
              // TODO Auto-generated catch block 
              e.printStackTrace(); 
             } 


            } 

           }); 

          } 

          break; 
         } catch (Exception e) { 
          handler.post(new Runnable() { 
           @Override 
           public void run() { 
            //serverStatus.setText("Oops. Connection interrupted. Please reconnect your phones."); 
           } 
          }); 
          e.printStackTrace(); 
         } 
        } 
       } else { 
        handler.post(new Runnable() { 
         @Override 
         public void run() { 
          //serverStatus.setText("Couldn't detect internet connection."); 
         } 
        }); 
       } 
      } catch (Exception e) { 
       handler.post(new Runnable() { 
        @Override 
        public void run() { 
         //serverStatus.setText("Error"); 
        } 
       }); 
       e.printStackTrace(); 
      } 



     } 
    } 

Client類：

公共類ClientThread實現Runnable {

 public void run() { 

      try { 


       InetAddress serverAddr = InetAddress.getByName("141.196.41.145"); 


       Log.d("ClientActivity", "C: Connecting..."); 
       Socket socket = new Socket(serverAddr,8080); 

       //Socket socket = new Socket("141.196.41.145",8080); 


       connected=true; 

       while (connected) { 

        try { 
         Log.d("ClientActivity", "C: Sending command."); 
         PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true); 
          // where you issue the commands 
          out.println(" MT 02 : " + thevariable); 
          Log.d("ClientActivity", "C: Sent."); 
          break; 

        } catch (Exception e) { 
         Log.e("ClientActivity", "S: Error", e); 
        } 


        } 
       socket.close(); 
       Log.d("ClientActivity", "C: Closed."); 
      } catch (Exception e) { 
       Log.e("ClientActivity", "C: Error", e); 
       connected=false; 
      } 
     } 
    } 

有「141.196.41.145」是本地IP o我的第二個設備。如果我將此IP更改爲我的第一個設備的本地IP，我可以向自己發送消息。

感謝您的關注和幫助

Answer 1

你在哪裏使用socket.connect();這裏？

  InetAddress serverAddr = InetAddress.getByName("141.196.41.145"); 


      Log.d("ClientActivity", "C: Connecting..."); 
      Socket socket = new Socket(serverAddr,8080); 

創建一個插座不會使conncection