Android Open Source - smartcar Main Activity

• Back to Development/arduino  ↑

From Project

Back to project page smartcar.

License

The source code is released under:

GNU General Public License

Java Source Code

/** Main class. This establishes a connection to the server, sends to the server
 *  and also listens to the camera feed.
 * @author Team Pegasus (simeon)//  w w w .  j av a  2s  .co  m
 */

package se.chalmers.balmung.smartcar;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;


import se.chalmers.balmung.smartcar.JoystickView;
import se.chalmers.balmung.smartcar.JoystickView.OnJoystickMoveListener;

import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends Activity {
    private SharedPreferences settings;
  
  private Socket socket;
  private String serverPort;
  private String serverIp;  
  private String prevMsg = "";
    private JoystickView joystick;
  
  ImageView videoView;
    private int displayWidth;
    private int displayHeight;
  private boolean videoPlaying = false;  
  Handler timerHandler = new Handler();
    Runnable timerRunnable = new Runnable() {

        @Override
        public void run() {
            new DownloadImageTask(videoView).execute("http://" + serverIp + "/pic.jpg");
            videoView.getLayoutParams().width = displayWidth;
        videoView.getLayoutParams().height = displayHeight;
            
            timerHandler.postDelayed(this, 40);
        }
    };
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  
    videoView = (ImageView) findViewById(R.id.videoView);
    displayWidth = videoView.getLayoutParams().width;
    displayHeight = videoView.getLayoutParams().height;
    
    joystick = (JoystickView) findViewById(R.id.joystickView);

    joystick.setOnJoystickMoveListener(new OnJoystickMoveListener() {

            @Override
            public void onValueChanged(int angle, int power, int direction) {
              // Scale speed
              if (angle < -90 || angle > 90) {
                power *= -1;
              }
              
              // X to Y adapter
              if (angle > 90) {
                angle = 180 - angle;
              } else if (angle < -90) {
                angle = -(180 + angle);
              }
                  send("!" + angle + ":" + power + "*");
            }
        }, JoystickView.DEFAULT_LOOP_INTERVAL);
    }
  
  @Override
  protected void onResume() {
    super.onResume();  
    
    settings = getSharedPreferences("DefaultPrefs", 0);
    serverIp = settings.getString("serverIp", "10.0.2.2");
    serverPort = settings.getString("serverPort", "8787");
    
    new Thread(new ClientThread()).start();
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    Intent intent = new Intent(this, SettingsActivity.class);
    startActivity(intent);
    return super.onOptionsItemSelected(item);
  }
  
  public void onAction(View view) {
    String message = "";
    send(message);
  }
  
  public void onVideo(View view) {  
    videoView.setImageResource(android.R.color.transparent);
    
    if (videoPlaying == true) {
      timerHandler.removeCallbacks(timerRunnable);
      videoPlaying = false;
    } else {
      videoPlaying = true;
      new DownloadImageTask(videoView).execute("http://" + serverIp + "/pic.jpg");
      timerHandler.postDelayed(timerRunnable, 0);          
    }
  }

  public void send(String message) {
    if (!prevMsg.contains(message)) {
      prevMsg = message;
      try {
        PrintWriter out = new PrintWriter(new BufferedWriter(
            new OutputStreamWriter(socket.getOutputStream())), true);
        out.println(message);
      } catch (UnknownHostException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }
  
  class ClientThread implements Runnable {

    @Override
    public void run() {
      try {
        InetAddress serverAddr = InetAddress.getByName(serverIp);
        socket = new Socket(serverAddr, Integer.parseInt(serverPort));
      } catch (UnknownHostException e1) {
        e1.printStackTrace();
      } catch (IOException e1) {
        e1.printStackTrace();
      }
    }
  }
  
  private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
      ImageView bmImage;

      public DownloadImageTask(ImageView bmImage) {
          this.bmImage = bmImage;
      }

      protected Bitmap doInBackground(String... urls) {
          String urldisplay = urls[0];
          Bitmap mIcon11 = null;
          try {
              InputStream in = new java.net.URL(urldisplay).openStream();
              mIcon11 = BitmapFactory.decodeStream(in);
          } catch (Exception e) {
              Log.e("Error", e.getMessage());
              e.printStackTrace();
          }
          return mIcon11;
      }

      protected void onPostExecute(Bitmap result) {
          bmImage.setImageBitmap(result);
      }
  }
}

Java Source Code List

• Back to Development/arduino  ↑