Two android clients - One java server

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Java

Mobile

Android

server

Hi,

I'm hoping someone can help me, I've created a java server and an android client (A), the client(A) gets it's GPS coordinates and sends them to the server, I need the server to send them to client(B). I'm not entirely sure as to what to do, whether I should have separate ports etc or what.

Below is my two clients and server


SERVER

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class TCPServer {

	public static void main(String[] args) throws Exception {

		Socket socketChild;
		Socket socketParent;
		
		ServerSocket ServerSocketChild = new ServerSocket(5555);
		ServerSocket ServerSocketParent = new ServerSocket(6666);
		

		System.out.println("Server started. Listening to the port 2001");
		System.out.println("Server: waiting for connection ..");

		while (true) {
			try {
				socketChild = ServerSocketChild.accept();
				socketParent = ServerSocketParent.accept();

				if (socketChild != null) {
					
					InputStream fromChild = socketChild.getInputStream();

					while (socketChild.isConnected() && socketParent.isConnected()) {
						
						System.out.println("Child Connected");
						System.out.println("Parent Connected");

						Scanner r = new Scanner(fromChild);
						String location;
						location = r.nextLine();
						System.out.println(location);

						OutputStream out = socketParent.getOutputStream();
						PrintWriter toParent = new PrintWriter(out);
						toParent.print(location);

						toParent.close();
					}
				}
				
				
			} catch (IOException ex) {
				System.out.println("Problem in message reading");
			}
		}
	}
}

CLIENT A

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;


public class Child extends Activity implements LocationListener {

	private Socket s;
	private PrintWriter p;
	public static double latitude;
	public static double longitude;
	String coordinates;
	

	@Override
	public void onCreate(Bundle savedInstanceState)

	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.child);

		LocationManager mlocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
		LocationListener mlocationListener = new MyLocationListener();

		mlocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
				mlocationListener);			
		
		String hello = "hello";  //FOR TESTING PURPOSES
		
		Transmit (hello);
		
		Log.d("test", "test");
	}



   public class MyLocationListener implements LocationListener {

        public void onProviderDisabled(String provider) {
            Toast.makeText(getApplicationContext(), "Gps Disabled",
                    Toast.LENGTH_SHORT).show();
        }

        public void onProviderEnabled(String provider) {
           Toast.makeText(getApplicationContext(), "Gps Enabled",
                   Toast.LENGTH_SHORT).show();
       }
        public void onStatusChanged(String provider, int status, Bundle extras) {
 
        }

		public void onLocationChanged(Location location) {
			// TODO Auto-generated method stub
		     latitude = location.getLatitude();
	         longitude = location.getLongitude();
	         
	         coordinates = ("TESTING " + latitude + longitude);
	         	         	         
	         //Transmit(coordinates);         
		}	
    }

	private void Transmit(final String message) {

		Thread trans = new Thread(new Runnable() {
			
			public void run() {

				Log.d("TRANSMIT", "CALLED");

				// TODO Auto-generated method stub
				try {
					
					s = new Socket("192.168.3.101", 5555); // connect to
															// server
					Log.d("CONNECTED", "Connected");

					DataOutputStream _OutPut = new DataOutputStream(
							s.getOutputStream());
					_OutPut.writeBytes(message + "\n");
					_OutPut.flush();
					_OutPut.close();

				} catch (UnknownHostException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		});
		trans.start();
	}

	public void onLocationChanged(Location location) {
		// TODO Auto-generated method stub
		
	}

	public void onProviderDisabled(String provider) {
		// TODO Auto-generated method stub
		
	}

	public void onProviderEnabled(String provider) {
		// TODO Auto-generated method stub
		
	}

	public void onStatusChanged(String provider, int status, Bundle extras) {
		// TODO Auto-generated method stub
		
	}


}

CLIENT B

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

import android.app.Activity;
import android.content.Context;
//import android.location.LocationListener;
//import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;

public class Parent extends Activity {

	private Socket s;
	private PrintWriter p;
	String location;

	public void onCreate(Bundle savedInstanceState)

	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.parent);
		
		Thread rec = new Thread(new Runnable() {

			public void run() {

				//Log.d("TRANSMIT", "CALLED");

				// TODO Auto-generated method stub
				try {

					s = new Socket("192.168.3.101", 6666); // connect to
															// server
					InputStream fromServer = s.getInputStream();
					//Log.d("CONNECTED", "Connected");

					while (s.isConnected()) {

						Scanner r = new Scanner(fromServer);
						location = r.nextLine();
						
						//OutputStream out = s.getOutputStream();
						//PrintWriter p = new PrintWriter(out);
			
					}

				} catch (UnknownHostException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		});
		rec.start();
		
		TextView myTextview = (TextView) findViewById(R.id.dist);
		myTextview.setText(location);
	}	
}

With this, I run the server, then run CLIENT B in the emulator and CLIENT A on the device, once I run CLIENT A, CLIENT B force shuts.

CLIENT A / SERVER connectivity is 100%, it prints to console (for testing). What I need to try to find out is how do I send the data to CLIENT B, I have used different ports and i'm sure that's why CLIENT B force shuts. I'm only learning Android a few months and I'm teaching myself, so any help would be greatly appreciated.

Regards,
Gary