Android socket通過UDP的方式來發送和接收資料，從而進行手機間的通訊。

傳送方：

public class SendToAIUIUtils {
    private static InetAddress mAddress;
    private static DatagramSocket socket = null;
    private static String ip = "255.255.255.255"; //傳送給整個區域網
    private static final int SendPort = 9999;  //傳送方和接收方需要埠一致

    public
 
 static void sendContextToAIUI(final Context context, final String content) {
        //初始化socket
        try {
            socket = new DatagramSocket();
        } catch (SocketException e) {
            e.printStackTrace();
        }
        try {
            mAddress = InetAddress.getByName(ip);
        } catch
 
 (UnknownHostException e) {
            e.printStackTrace();
        }

        //建立執行緒傳送資訊
        new Thread() {
            private byte[] sendBuf;

            public void run() {
                try {
                    sendBuf = content.getBytes("utf-8");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                DatagramPacket recvPacket1 = new
 
 DatagramPacket(sendBuf, sendBuf.length, mAddress, SendPort);
                try {
                    socket.send(recvPacket1);
                    socket.close();
                    Log.e("zziafyc", "已將內容傳送給了AIUI端內容為：" + content);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }
}

接收端：

public class ReceiveUtils {
    private DatagramSocket socket;
    private static final int PhonePort = 9999;//手機埠號
    private DatagramPacket packet;
    private volatile boolean stopReceiver;
    String filePath = "/sdcard/AIUI/devices.txt";

    private void receiveMessage() {
        new Thread() {
            public void run() {
                try {
                    socket = new DatagramSocket(PhonePort);
                } catch (SocketException e) {
                    e.printStackTrace();
                }
                byte[] receBuf = new byte[1024];
                packet = new DatagramPacket(receBuf, receBuf.length);
                while (!stopReceiver) {
                    try {
                        socket.receive(packet);
                        String receive = new String(packet.getData(), 0, packet.getLength(), "utf-8");
                        Log.e("zziafyc", "收到的內容為：" + receive);
                        if (receive.contains("account") || receive.contains("gateWayId")) {
                            saveSharePreference(receive);
                        } else {
                            saveToFile(receive, filePath);

                        }

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }
}

  public void saveSharePreference(String receive) {
        JSONObject jsonObject = null;
        try {
            jsonObject = new JSONObject(receive);
            if (receive.contains("account")) {
                SharePreferenceUtils.put(this, "account", jsonObject.getString("account"));
                SharePreferenceUtils.put(this, "password", jsonObject.getString("password"));
            } else {
                SharePreferenceUtils.put(this, "gateWayId", jsonObject.getString("gateWayId"));
                SharePreferenceUtils.put(this, "gateWayName", jsonObject.getString("gateWayName"));
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    public void saveToFile(String str, String filePath) {
        try {
            File file = new File(filePath);
            if (!file.exists()) {
                file.createNewFile();
            }
            FileOutputStream outStream = new FileOutputStream(file);
            outStream.write(str.getBytes());
            outStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }