第一種，PC作為服務器，APP做客戶端

    服務端代碼：
            try {
        mServerSocket = new ServerSocket(8002);
        while (mCanRun) {
            System.out.println("等待連接..." + mServerSocket.getInetAddress());
            Socket socket = mServerSocket.accept();
            System.out.println("已連接...");
            ReadThread socketThread = new ReadThread(socket);
            if (mList == null) {
                mList = new ArrayList<>();
            }
            mList.add(socketThread);
            socketThread.start();
            
            socketThread.sendMsg("你是第" + mList.size() + "個");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } 
    客戶端代碼：Socket socket = new Socket("127.0.0.1", 8002); 即可連接成功。
 

通過USB數據線讓PC與Android APP通信的方式