ServerActivity.java

package com.phinominal.onboard;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.Enumeration;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.TextView;

public class ServerActivity extends Activity {
	
	private TextView serverStatus;

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

    // designate a port
    public static final int SERVERPORT = 8080;

    private Handler handler = new Handler();

    private ServerSocket serverSocket;
    
    private OutputStreamWriter out;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.server);
        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() {
                        
                        public void run() {
                            serverStatus.setText("Listening on IP: " + SERVERIP);
                            Log.e("OUTPUT", "Got IP, now listening...");
                        }
                    });
                    serverSocket = new ServerSocket(SERVERPORT);
                    while (true) {
                        // listen for incoming clients
                        Socket client = serverSocket.accept();
                        handler.post(new Runnable() {
                            
                            public void run() {
                                serverStatus.setText("Connected.");
                            }
                        });

                        try {

                            BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
                            OutputStream sock_out= client.getOutputStream();
                            OutputStream bout= new BufferedOutputStream(sock_out);
                            out = new OutputStreamWriter(bout, "8859_1");
                            
                            String line = null;
                            while ((line = in.readLine()) != null) {
                                Log.d("ServerResponse:  ", line);

                                out.write(handleInputCommand(line));
                                out.flush();  // Don't forget to flush!
                               
                                handler.post(new Runnable() {
                                    
                                    public void run() {
                                        // do whatever you want to the front end
                                        // this is where you can be creative
                                    }
                                });
                            }
                            break;
                        } catch (UnsupportedEncodingException e) {
                        	Log.d("StreamError:  ", "This VM does not support the Latin-1 character set.");
                        } catch (Exception e) {
                            handler.post(new Runnable() {
                                
                                public void run() {
                                    serverStatus.setText("Oops. Connection interrupted. Please reconnect your phones.");
                                }
                            });
                            e.printStackTrace();
                        }
                    }
                } else {
                    handler.post(new Runnable() {
                        
                        public void run() {
                            serverStatus.setText("Couldn't detect internet connection.");
                        }
                    });
                }
            } catch (Exception e) {
                handler.post(new Runnable() {
                    
                    public void run() {
                        serverStatus.setText("Error");
                    }
                });
                e.printStackTrace();
            }
        }
    }

    // gets the ip address of the 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;
    }
    
    private String handleInputCommand(String input) {
    	return input;
    }

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

}