在没有互联网的本地 wifi 聊天中跳过消息

Question

我想在没有互联网的情况下使用 wifi 在两个或更多设备上聊天。我正在使用套接字从第一个 android 手机向第二个手机发送消息。我遇到了一些按摩被接收和一些按摩跳过并且没有在第二部手机上接收的问题。我尝试过 Multicastsoket 和 Datagramsoket，但跳过了短信。以下是我的发送端和接收端代码。

**- Sender side**
    public static void sender(final String ipAddress, final String message) {
            // Creates the thread for capturing and transmitting audio
          /*  AsyncTaskExample asyncTask = new AsyncTaskExample();
            asyncTask.execute(message);*/
            Thread replyThread = new Thread(new Runnable() {
    
                @Override
                public void run() {
    
                    try {
                        InetAddress address = InetAddress.getByName(ipAddress);
                        byte[] data = message.getBytes();
                        DatagramSocket socket = new DatagramSocket();
                        DatagramPacket packet = new DatagramPacket(data, data.length, address, BROADCAST_PORT);
                        socket.setReuseAddress(true);
                        socket.send(packet);
                        Log.i(LOG_TAG, "Sent message( " + message + " ) to " + ipAddress);
                        socket.disconnect();
                        socket.close();
                    } catch (UnknownHostException e) {
    
                        Log.e(LOG_TAG, "Failure. UnknownHostException in sendMessage: " + ipAddress);
                    } catch (SocketException e) {
    
                        Log.e(LOG_TAG, "Failure. SocketException in sendMessage: " + e);
                    } catch (IOException e) {
    
                        Log.e(LOG_TAG, "Failure. IOException in sendMessage: " + e);
                    }
                }
            });
            replyThread.start();
        }
    
**- Receiver side**   
    
    public void receiver() {
            // Creates the thread for receiving massage
            
                Thread receiveThread = new Thread(new Runnable() {
    
                    @Override
                    public void run() {
    
                        try {
                            DatagramSocket socket  = new DatagramSocket(BROADCAST_PORT);
                         //   InetAddress group = InetAddress.getByName(myIPAddress);
                            //socket.setSoTimeout(1000);
                            byte[] buffer = new byte[BUF_SIZE];
                            DatagramPacket packet = new DatagramPacket(buffer, BUF_SIZE);
    
                            while (LISTEN) {
                                // Listen for incoming call requests
                                try {
                                    Log.i(LOG_TAG, "Listening for incoming message");
                                    /* Arrays.fill(buffer,(byte)0);*/
                                    socket.receive(packet);
                                    String data = new String(buffer, 0, packet.getLength());
                                    Log.i("SocketMSG", "Packet received from " + packet.getAddress() + " with contents: " + data);
                                    String action = data.substring(0, 4);
                                    //Toast.makeText(context,"Packet received from",Toast.LENGTH_SHORT).show();
                                } catch (Exception e) {
                                }
                            }
                            
                            socket.disconnect();
                            socket.close();
                        } catch (SocketException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                });
                receiveThread.start();
        }
     

Answer 1

您可以在 UDP 之上实现类似 TCP 的行为，请参阅此 repo，例如：https://github.com/jin-zhe/reliable-UDP/blob/master/Sender.java