Android Open Source - CarRemote Wifi Receiver

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License

The source code is released under:

GNU General Public License

Java Source Code

package at.cartoffel.remote;
// w  w w . j a  va 2  s  .c o m
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.util.ResourceBundle.Control;

import android.content.Context;
import android.util.Log;
import android.widget.Toast;

/**
 * Class for recieving data from an Arduino microcontroller via UDP
 * 
 * @author Samuel Hammer
 * 
 */
public class WifiReceiver implements Runnable {

  Context context;

  /**
   * Constructor
   * @param context
   */
  public WifiReceiver(Context context) {
    this.context = context;
  }

  @Override
  public void run() {
    try {
      int port = 6666;

      // Create a socket to listen on the port.
      DatagramSocket dsocket = new DatagramSocket(port);

      // Create a buffer to read datagrams into. If a
      // packet is larger than this buffer, the
      // excess will simply be discarded!
      byte[] buffer = new byte[2048];

      // Create a packet to receive data into the buffer
      DatagramPacket packet = new DatagramPacket(buffer, buffer.length);

      // Now loop forever, waiting to receive packets and printing them.
      while (true) {
        // Wait to receive a datagram
        dsocket.receive(packet);

        // Convert the contents to a string, and display them
        String msg = new String(buffer, 0, packet.getLength());
        
        //Split the String containing the distances into one String for each side
        String[] distances = msg.split(",");
        final String frontDistance = distances[0];
        final String backDistance = distances[1];
        final String leftDistance = distances[2];
        final String rightDistance = distances[3];
        final String speed = distances[4];
        
        //Print out the distances for each side
        Log.d("front distance", frontDistance);
        ControlActivity.textview_frontDistance.post(new Runnable() {
          @Override
          public void run() {
            ControlActivity.textview_frontDistance.setText(frontDistance);
          }
        });
        
        Log.d("Back distance", backDistance);
        ControlActivity.textview_backDistance.post(new Runnable() {
          @Override
          public void run() {
            ControlActivity.textview_backDistance.setText(backDistance);
          }
        });
        
        Log.d("Left distance", leftDistance);
        ControlActivity.textview_leftDistance.post(new Runnable() {
          @Override
          public void run() {
            ControlActivity.textview_leftDistance.setText(leftDistance);
          }
        });
        
        Log.d("Right distance", rightDistance);
        ControlActivity.textview_rightDistance.post(new Runnable() {
          @Override
          public void run() {
            ControlActivity.textview_rightDistance.setText(rightDistance);
          }
        });
        
        Log.d("Speed", speed);
        ControlActivity.textview_speed.post(new Runnable() {
          @Override
          public void run() {
            ControlActivity.textview_speed.setText("Speed: " + speed);
          }
        });
        
        
        // Reset the length of the packet before reusing it.
        packet.setLength(buffer.length);
      }
    } catch (Exception e) {
      System.err.println(e);
    }
  }
}

Java Source Code List

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