java - Android客户端无法与服务器PC一起使用

Question

我正在尝试开发一个基本应用程序，用于将字符串从 android 客户端发送到 pc 服务器，但问题是服务器没有收到任何消息。我正在使用套接字在客户端和服务器之间进行通信。服务器已启动但没有接收任何消息。这是用java编写的示例服务器代码

     /*
         * To change this template, choose Tools | Templates
         * and open the template in the editor.
         */
        package wifi.communicate;
        import java.io.BufferedReader;
        import java.io.IOException;
        import java.io.InputStreamReader;
        import java.net.InetAddress;
        import java.net.ServerSocket;
        import java.net.Socket;
         public class WIfiCommunicate 
        {

            private static final int port=4444;
            private static ServerSocket serversocket;
            private static Socket clientsocket;
            private static InputStreamReader reader;
            private static BufferedReader breader;
            private static InputStreamReader InputStreamReader;
            private static String message;

            public static void main(String[] args) 
            {
               try
               {
                serversocket=new ServerSocket(port,0,InetAddress.getLocalHost());
                System.out.println("IP:  "+serversocket.getInetAddress()+  "port" +serversocket.getLocalPort()); 

               }
               catch(IOException e)
               {
                   System.out.println("Could not listen to port: "+port);
               }
               System.out.println("Server started ");
               while(true)
               {
                   try
                   {
                   clientsocket=serversocket.accept();
                   reader=new InputStreamReader(clientsocket.getInputStream());  
                   breader=new BufferedReader(reader);
                   message=breader.readLine();

                   }
                   catch(IOException e)
                   {
                       System.out.println("Message not received");
                   }
               }
            }   
        }

here is the android activity code

        import java.io.IOException;
        import java.io.PrintWriter;
        import java.net.Socket;
        import java.net.UnknownHostException;
       import android.os.AsyncTask;
        import android.os.Bundle;
        import android.app.Activity;
        import android.view.Menu;
        import android.view.View;
        import android.widget.EditText;

        public class MainActivity extends Activity {

            EditText editText;
            String n1;

            @Override
            protected void onCreate(Bundle savedInstanceState) 
            {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);
                editText=(EditText)findViewById(R.id.editText1);


            }
            public void onClick(View view)
            {
                if(view.getId()==R.id.button1)
                {
                    n1=editText.getText().toString();
                    new connectserver().execute(n1);
                }
            }   
            public class connectserver extends AsyncTask<String,Integer,Socket> 
            {
                private static final String IP_address="192.168.0.101";
                private static final int port=4444;
                private String mText;
                protected Socket doInBackground(String... params)
                {
                    if(params.length!=1)
                            throw new IllegalArgumentException();


                    mText=params[0];

                    Socket client=null;
                    try
                    {
                        client=new Socket(IP_address,port);
                    }
                    catch(UnknownHostException e)
                    {
                        e.printStackTrace();

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

                    return client;
                }
                protected void onPostExecute(Socket client)
                {
                    try
                    {
                       PrintWriter pwriter;
                       String message=mText;

                       editText.setText("");

                       pwriter=new PrintWriter(client.getOutputStream(),true);
                       pwriter.write(message);

                       pwriter.flush();
                       pwriter.close();
                       client.close();

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

            @Override
            public boolean onCreateOptionsMenu(Menu menu) 
            {
                // Inflate the menu; this adds items to the action bar if it is present.
                getMenuInflater().inflate(R.menu.main, menu);
                return true;
            }

        }