Android Open Source - EnergyWastingApp Wi Fi Data Transfer

• Back to App/device  ↑

From Project

Back to project page EnergyWastingApp.

License

The source code is released under:

Copyright ? 2013-2014 Pekka Ekman <pekka.ekman@aalto.fi> 2013 Babujee Jerome Robin <robin.babujeejerome@aalto.fi> Permission is hereby granted, free of charge, to any person obtaining a ...

Java Source Code

package fi.aalto.pekman.energywastingapp.components;
//from  w ww.ja  v a 2s  . co m
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.URL;
import java.util.Random;
import android.util.Log;


public class WiFiDataTransfer extends Component {

  public static final String SERVERIP = "192.168.0.3"; 
  private URL url;
  public static final String urlString = "http://www.ndtv.com/sitemap.xml";
  public static final int SERVERPORT = 4444; 
  private static DatagramSocket socket = null;
  private static InetAddress serverAddr = null;
  private Thread sendingThread = null;
  private Thread downloadThread = null;
  private static boolean running = false;
  
  @Override
  public String getName() { return "WiFiDataTransfer"; }

  @Override
  public void start() {
    Log.d("WiFiDataTransfer", "Client: Starting the client");
    WiFiDataTransfer.running = true;
    try
    {
      if(null == socket){
        socket = new DatagramSocket();
      }
      
      if(null == serverAddr){
        serverAddr = InetAddress.getByName(SERVERIP); 
      }
      
      if(null == url) {
        url = new URL(urlString);
      }

      sendingThread = new Thread() {
        @Override
        public void run() {
          sendUDPDataToAddress(serverAddr, socket);
        };
      };
      
      downloadThread = new Thread() {
        @Override
        public void run() {
          downloadDataToSDCard();
        };
      };

      sendingThread.start();
      downloadThread.start();

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

  @Override
  public void stop() {
    Log.d("WiFiDataTransfer", "Client: Stopping the client");
    WiFiDataTransfer.running = false;
    if(null != sendingThread && sendingThread.isAlive()){
      sendingThread.interrupt();  
    }
    socket = null;
    serverAddr = null;
  }

  @Override
  public void onPause() {
    Log.d("WiFiDataTransfer", "Client: Pause Called");
    if(!WiFiDataTransfer.running){
      markTurnedOff();
    }
  }
  
  private void sendUDPDataToAddress(InetAddress serverAddr, DatagramSocket socket) {
    byte[] buf = new byte[1400];
    new Random().nextBytes(buf);
    while(WiFiDataTransfer.running){
        try
        {
          DatagramPacket packet = new DatagramPacket(buf,buf.length, serverAddr, SERVERPORT); 
          socket.send(packet);
          Log.d("WiFiDataTransfer", "Client: Sending Succeeded");
        } catch (IOException e) {
          Log.e("WiFiDataTransfer", "Client: Sending Failed");
          e.printStackTrace();
        } 
    }
  }
  
  private void downloadDataToSDCard() {
    HttpURLConnection urlConnection = null;
    File destinationFile = null;
    FileOutputStream fileOutput = null;
    InputStream inputStream = null;
    while(WiFiDataTransfer.running){
      try {
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.setDoOutput(true);
        urlConnection.connect();
        destinationFile = new File("/dev/null");
        fileOutput = new FileOutputStream(destinationFile);
        inputStream = urlConnection.getInputStream();
        byte[] buffer = new byte[1024];

        int bufferLength = 0; 
        while ( (bufferLength = inputStream.read(buffer)) > 0 ) 
        {
          fileOutput.write(buffer, 0, bufferLength);
        }
      } catch (Exception e) {
        Log.e("WiFiDataTransfer", "Exception while getting data from url");
        e.printStackTrace();
      } finally {
        try {
          if(null != fileOutput){
            fileOutput.flush();
            fileOutput.close();
          }
          if(null != destinationFile){
            destinationFile.delete();
          }
          if(null != inputStream){
            inputStream.close();
          }
          if(null != urlConnection){
            urlConnection.disconnect();
            urlConnection = null;
          }
          
        } catch (IOException e) {
          Log.e("WiFiDataTransfer", "Exception cleaning up");
          e.printStackTrace();
        }
        
      }
    }

  }
}

Java Source Code List

• Back to App/device  ↑