Android手机通过与PC通讯的有关问题

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        new Thread() {
            @Override
            public void run() {
                beginRun();
            }
        };
    }
    
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        MainService.ISRUN = false;
    }

    private void beginRun() {
        try {
            ServerSocket serverSocket = new ServerSocket(5566);
            Socket client = serverSocket.accept();
            new Thread(new SocketThread(client)).start();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

public class SocketThread implements Runnable {
    private static final String TAG = "SocketThread";
    private static final int MAX_BUFFER_BYTES = 2048;
    private static final String ENCODING = "UTF-8";
    private Socket client;

    public SocketThread(Socket client) {
        this.client = client;
    }

    @Override
    public void run() {
        Log.d(TAG, "---服务线程启动...");
        BufferedInputStream in = null;
        BufferedOutputStream out = null;
        try {
            in = new BufferedInputStream(client.getInputStream());
            out = new BufferedOutputStream(client.getOutputStream());
            while (MainService.ISRUN) {
                if (!client.isConnected())
                    break;
                String cmd = readCMD(in);
                System.out.println("收到：" + cmd);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                out.close();
                in.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            Log.d(TAG, "----线程关闭");
        }
    }

    private String readCMD(InputStream in) {
        byte[] bufferBytes = new byte[MAX_BUFFER_BYTES];
        String cmd = null;
        try {
            int readBytesCount = in.read(bufferBytes);
            cmd = new String(bufferBytes, 0, readBytesCount);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return cmd;
    }

}

public class Main {
    private static final String HOST = "127.0.0.1";
    private static final int PORT = 55666;
    private static Socket pc;

    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName(HOST);
            pc = new Socket(address, PORT);
            BufferedOutputStream out = new BufferedOutputStream(
                    pc.getOutputStream());
            int i = 1;
            while (true) {
                String msg = i++ + "你妹的";
//                out.write(msg.getBytes());
                out.write(3);
                out.flush();
                Thread.sleep(3000);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}