wayne mahes:

i need to send request to the server and the server need to respond back a text string. Now when i click a button on android app it send request to my server and i can view it but i could not see the respond in the android app. it should be displaying the text in a textarea. below is my code in my android app.

package monitor;


import java.util.Enumeration;
import android.content.Context;
import android.os.Environment;
import android.text.format.Formatter;
import android.util.Log;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.HttpURLConnection;
import java.io.ObjectOutputStream;
import java.io.BufferedWriter;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.net.Socket;
import java.io.PrintWriter;
import android.os.Bundle;
import java.net.SocketException;
import java.net.UnknownHostException;


public class welcome extends AppCompatActivity {
    private Socket s;
    private Button status;
private Button client;
private Button log;
private TextView text;
private PrintWriter writer;

protected void onCreate(Bundle savedInstanceState) {

    OutputStreamWriter request = null;
    super.onCreate(savedInstanceState);
    setContentView(R.layout.welcome);
    setupVariables();
    final TextView mTextView = (TextView) findViewById(R.id.text);

    status.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v)
        {
            Thread t = new Thread(){

                @Override
                public void run(){
                    //String serverMsg=null;
                    //String text = "test";
                    try {
                        System.out.println("Starting Connection");
                        Socket s = new Socket("10.0.2.2", 25000);
                        System.out.println("Connection DONE");
                        DataOutputStream dos = new DataOutputStream(s.getOutputStream());
                        dos.writeUTF("stat");
                        dos.flush();

                      // Toast.makeText(getApplicationContext(), "Message sent to the server",
                     //Toast.LENGTH_SHORT).show();
                        //Intent intent=new Intent(welcome.this,status.class); 
                       //startActivity(intent);
                     InputStream is = s.getInputStream();
                        InputStreamReader isr = new InputStreamReader(is);
                        BufferedReader br = new BufferedReader(isr);
                        text = br.readLine();

                        dos.close();
                        s.close();
                        System.out.println("Closing socket");
                    }
                    catch (UnknownHostException e){
                        System.out.println("There was an Unknown Erorr:");
                        e.printStackTrace();
                    } catch (IOException e) {
                        System.out.println("There was an IOException:");
                        e.printStackTrace();
                    }
                   mTextView.setText(text);

                }

            };
            t.start(); }
    });

    client.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v)
        {
            Thread t = new Thread(){
                @Override
                public void run(){
                    try {
                        System.out.println("Starting Connection");
                        Socket s = new Socket("10.0.2.2", 25000);
                        System.out.println("Connection DONE");
                        DataOutputStream dos = new DataOutputStream(s.getOutputStream());
                        dos.writeUTF("client");
                        InputStream is = s.getInputStream();
                        InputStreamReader isr = new InputStreamReader(is);
                        BufferedReader br = new BufferedReader(isr);
                        text = br.readLine();
                        dos.close();
                        s.close();
                        System.out.println("Closing socket");
                    }
                    catch (UnknownHostException e){
                        System.out.println("There was an Unknown Erorr:");
                        e.printStackTrace();
                    } catch (IOException e) {
                        System.out.println("There was an IOException:");
                        e.printStackTrace();
                    }
                   mTextView.setText(text);
                        dos.flush();
                        dos.close();
                        s.close();
                        System.out.println("Closing socket");
                    }
                    catch (UnknownHostException e){
                        System.out.println("There was an Unknown Erorr:");
                        e.printStackTrace();
                    } catch (IOException e) {
                        System.out.println("There was an IOException:");
                        e.printStackTrace();
                    }
                }
            };
            t.start();
        }
    });
    log.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v)
        {
            Intent intent=new Intent(welcome.this,MainActivity.class); // redirecting to LoginActivity.
            startActivity(intent);
        }
    });

}
 public void onBackPressed() {
// empty so nothing happens
    }
private void setupVariables() {

    status = (Button) findViewById(R.id.wel2);
    client = (Button) findViewById(R.id.wel3);
    log = (Button) findViewById(R.id.iog);

}
}

Below is my server code.

import java.io.*;
import java.net.*;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.lang.Runtime;
import java.util.Enumeration;
import java.io.IOException;

public class fyp4 {

private static Socket socket;

public static void main(String[] args) throws IOException
{
try
    {
        int port = 25000;
        ServerSocket serverSocket = new ServerSocket(port);
        System.out.println("Server Started and listening to the port 25000");
       while(true)
        {   

            //Reading the message from the client
            socket = serverSocket.accept();
            InputStream is = socket.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            //Socket newSock = s.accept();
            String number = br.readLine();
            number = number.trim();
            System.out.println("Message received from client is "+number);
            OutputStream os = socket.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write(returnMessage);
            System.out.println("Message sent to the client is "+returnMessage);
           bw.flush();
        }
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

    finally
    {
        try
        {
            socket.close();
        }
        catch(Exception e){}
    }
}    
}