无法连接到python服务器（android [java]客户端）

Question

I have a simple python socket server and simple android [java] socket client. The client not successful to connect my server.

My server working good (I have tried with simple socket client in python).

Server (python):

import socket
    def main():
    listening_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    server_address = (' ', LISTEN_PORT)
    listening_sock.bind(server_address)
    listening_sock.listen(1)

    client_soc, client_address = listening_sock.accept()

    client_msg = client_soc.recv(1024)
    client_msg = client_msg.decode()

    print(client_msg)

    answer = "hello " + client_msg
    client_soc.sendall(answer.encode())

   client_soc.close()

   listening_sock.close()
   #print(str(get_distance_by_four_points("31.766977", "34.622898", "31.769887", "34.625430", "31.772632", "34.628273", "31.779327", "34.632951") / 1000) + " km")


  if __name__ == "__main__":
   main()

Client (java):

package com.example.client;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class MainActivity extends AppCompatActivity {
EditText etToServer;
TextView tvFromSer;

private static Socket sock;
private static ServerSocket serSock;
private static PrintWriter prWriter;
private static InputStreamReader in;
private static BufferedReader bf;

String message = "";
private static String LOCAL_IP = "127.0.0.1";
private static int PORT = 2002;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    etToServer = (EditText)findViewById(R.id.etxtUsername);
    tvFromSer = (TextView)findViewById(R.id.tvFromServer);
}


public void sendMsg(View view) {
    message = etToServer.getText().toString();

    myTask myT = new myTask();
    myT.execute();
}


class myTask extends AsyncTask<Void,Void, Void> {

    @SuppressLint("WrongThread")
    @Override
    protected Void doInBackground(Void... voids) {
        try {
            sock = new Socket(LOCAL_IP, PORT);

            prWriter = new PrintWriter(sock.getOutputStream());

            prWriter.write(message);
            prWriter.flush();
            prWriter.close();

            sock.close();
        } catch (IOException e) {
            e.printStackTrace();
            tvFromSer.setText(e.toString());
        }
        return null;
    }
}
}

java.net.connectException: failed to connect to /127.0.0.1 (port 2002) from /:: (port 58590): connect failed: ECONNREFUSED (Connection refused)

Answer 1

我想你忘了在 AndroidManifest.xml 中授予权限