android - 无法通过套接字连接

Question

美好的一天，我尝试通过 Socket 连接两部安卓手机。我有两个不同的应用程序（服务器和客户端）。服务器由一个 Activity 组成

public class ShareCameraActivity extends Activity {
    /** Called when the activity is first created. */
    private TextView serverStatus;

    // default ip
    public static String SERVERIP = "10.0.2.15";

    // designate a port
    public static final int SERVERPORT = 12345;

    private Handler handler = new Handler();

    private ServerSocket serverSocket;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        serverStatus = (TextView) findViewById(R.id.server_status);

        SERVERIP = getLocalIpAddress();

        Thread fst = new Thread(new ServerThread());
        fst.start();
    }

    public class ServerThread implements Runnable {

        public void run() {
            try {
                if (SERVERIP != null) {
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            serverStatus.setText("Listening on IP: " + SERVERIP);
                        }
                    });
                    serverSocket = new ServerSocket(SERVERPORT);
                    while (true) {
                        // listen for incoming clients
                        Socket client = serverSocket.accept();
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                serverStatus.setText("Connected.");
                            }
                        });

                        try {
                            BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
                            String line = null;
                            while ((line = in.readLine()) != null) {
                                Log.d("ServerActivity", line);
                                handler.post(new Runnable() {
                                    @Override
                                    public void run() {
                                        // do whatever you want to the front end
                                        // this is where you can be creative
                                    }
                                });
                            }
                            break;
                        } catch (Exception e) {
                            handler.post(new Runnable() {
                                @Override
                                public void run() {
                                    serverStatus.setText("Oops. Connection interrupted. Please reconnect your phones.");
                                }
                            });
                            e.printStackTrace();
                        }
                    }
                } else {
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            serverStatus.setText("Couldn't detect internet connection.");
                        }
                    });
                }
            } catch (Exception e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        serverStatus.setText("Error");
                    }
                });
                e.printStackTrace();
            }
        }
    }

    // gets the ip address of your phone's network
    private String getLocalIpAddress() {
        try {
            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
                NetworkInterface intf = en.nextElement();
                for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                    InetAddress inetAddress = enumIpAddr.nextElement();
                    if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); }
                }
            }
        } catch (SocketException ex) {
            Log.e("ServerActivity", ex.toString());
        }
        return null;
    }

    @Override
    protected void onStop() {
        super.onStop();
        try {
             // make sure you close the socket upon exiting
             serverSocket.close();
         } catch (IOException e) {
             e.printStackTrace();
         }
    }
}

客户是

public class ShareCameraClientActivity extends Activity {


        private EditText serverIp;

        private Button connectPhones;

        private String serverIpAddress = "10.48.97.53";

        private boolean connected = false;

        private Handler handler = new Handler();

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

            serverIp = (EditText) findViewById(R.id.server_ip);
            connectPhones = (Button) findViewById(R.id.connect_phones);
            connectPhones.setOnClickListener(connectListener);
        }

        private OnClickListener connectListener = new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (!connected) {
                    serverIpAddress = serverIp.getText().toString();
                    if (!serverIpAddress.equals("")) {
                        Thread cThread = new Thread(new ClientThread());
                        cThread.start();
                    }
                }
            }
        };

        public class ClientThread implements Runnable {

            public void run() {
                try {
                    serverIpAddress = "10.48.97.53";
                    InetAddress serverAddr = InetAddress.getByName(serverIpAddress);

                    Log.d("ClientActivity", "C: Connecting...");
                    Socket socket = new Socket(serverAddr, ServerActivity.SERVERPORT);
                    connected = true;
                    while (connected) {
                        try {
                            Log.d("ClientActivity", "C: Sending command.");
                            PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
                                        .getOutputStream())), true);
                                // where you issue the commands
                                out.println("Hey Server!");
                                Log.d("ClientActivity", "C: Sent.");
                        } catch (Exception e) {
                            Log.e("ClientActivity", "S: Error", e);
                        }
                    }
                    socket.close();
                    Log.d("ClientActivity", "C: Closed.");
                } catch (Exception e) {
                    Log.e("ClientActivity", "C: Error", e);
                    connected = false;
                }
            }
        }


}

服务器工作正常并获取我的 IP 地址，但是，客户端不想连接他，并且总是会遇到连接超时的异常情况。