android UDP通訊

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Android UDP通訊很簡單的，調用下面這個方法就可以實現用戶端和服務端的UDP通訊，

 

只需要把要發給伺服器的資料轉成一個byte數組格式傳進去就行了。

 

 

/**用戶端向伺服器端發送UDP資料*/public static void sendUdpData(final byte[] bytesToSend) {    new Thread(){        @Override        public void run() {            try{                //IP是伺服器位址                InetAddress serverAddress = InetAddress.getByName(IP);                               //PORT是伺服器連接埠號碼                int serverPort = PORT;                DatagramSocket socket = new DatagramSocket();                socket.setSoTimeout(8000);                                //sendPacket發送的資料包                DatagramPacket sendPacket = new DatagramPacket(bytesToSend,bytesToSend.length,serverAddress,serverPort);                //receivePacket返回的資料包                DatagramPacket receivePacket = new DatagramPacket(new byte[bytesToSend.length],bytesToSend.length);                int tries = 0;                boolean receivedResponse = false;                do{                    socket.send(sendPacket);                    try{                        socket.receive(receivePacket);                        if(!receivePacket.getAddress().equals(serverAddress)){                            throw new IOException("接收到未知來源的包");                        }                        receivedResponse = true;                    }catch(InterruptedIOException e){                        tries +=1;                        Log.i("TAG","Received:"+"Time out,"+(5-tries));                    }                }while((!receivedResponse)&&(tries > 5));                if(receivedResponse){                    //在這裡可以拿到伺服器返回的資料                    String receiveData=new String(receivePacket.getData());                    Log.i("TAG","返回資料:"+receiveData);                }else{                    Log.i("TAG","NO response -- giving up");                }                socket.close();            }catch (Exception e){                e.printStackTrace();            }        }    }.start();}

android UDP通訊