Android Open Source - Location-Service Location Service

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.ics499_lipyeow;
//  w  w  w .ja  v  a  2  s .co  m
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import com.example.ics499_lipyeow.Locator.ResponsiveReceiver;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;

import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Environment;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.Toast;

/**
 * A Service to run the Locator app on the background
 * 
 * @author Alexander Cam Liu
 * 
 */
public class LocationService extends IntentService implements LocationListener {

  public static final String outGoingMessage = "imsg";
  public static final String inComingMessage = "imsg";
  public static final String TAG = "LocationService";

  public LocationService() {
    super("LocationService");
    // TODO Auto-generated constructor stub
  }

  // Location services fields
  private Location location;
  private LocationManager service;
  private String provider;

  // The file to be uploaded to the server
  private File gpxfile;
  private String file;

  // Unique ID for the phone
  TelephonyManager telephonyManager;
  String uniqueID;

  // Store the coordinates
  double[] coordinates = new double[2];

  /**
   * The method that will serve as the bridge between the Activity and this
   * service At the end it will broadcast the data
   */
  @Override
  protected void onHandleIntent(Intent intent) {

  }

  public void sendData() {
    Intent broadcastIntent = new Intent();
    broadcastIntent.setAction(ResponsiveReceiver.ACTION_RESP);
    broadcastIntent.addCategory(Intent.CATEGORY_DEFAULT);
    broadcastIntent.putExtra(outGoingMessage, coordinates);
    sendBroadcast(broadcastIntent);
  }

  /**
   * Initalize all the fields with the class is called
   */
  public void onCreate() {
    super.onCreate();
    // Get the phone device unique ID
    telephonyManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
    uniqueID = telephonyManager.getDeviceId();
    file = uniqueID + ".csv";
    // Get the file from the SD card
    gpxfile = new File(Environment.getExternalStorageDirectory(), file);

    // If the file does not exit, create the file and write the headers
    if (!gpxfile.exists()) {
      String fields = "\"latitude\",\"longitude\",\"time\" \n";
      try {
        writeToFile(fields, gpxfile);
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }

    // Start the location services manager
    service = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    // Set the criteria
    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_MEDIUM);
    criteria.setPowerRequirement(Criteria.POWER_MEDIUM);
    criteria.setCostAllowed(false);
    provider = service.getBestProvider(criteria, false);
    location = service.getLastKnownLocation(provider);

    // Get the last known location from the provider cache
    // If null, that is fine. That means it was not used the provider
    if (location != null) {
      onLocationChanged(location);
      Toast.makeText(this,
          "Using: " + location.getProvider() + " provider",
          Toast.LENGTH_LONG).show();
    }
  }

  /**
   * Called when the startService is called
   */
  @Override
  public void onStart(Intent intent, int startId) {
    service.requestLocationUpdates(provider, 300000, 0, this);

  }

  /*
   * Called when the stopService is called
   */
  @Override
  public void onDestroy() {
    // remove any listener
    service.removeUpdates(this);
  }

  /**
   * Called when a new location is changed
   */
  @Override
  public void onLocationChanged(Location location) {
    double latitude = location.getLatitude();
    double longitude = location.getLongitude();
    coordinates[0] = latitude;
    coordinates[1] = longitude;
    String data = latitude + "," + longitude + "," + "\"" + getTime()
        + "\"" + "\n";
    try {
      // write the data to the file
      writeToFile(data, gpxfile);
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    sendData();
  }

  @Override
  public void onProviderDisabled(String provider) {
    Toast.makeText(this, "Provider disabled", Toast.LENGTH_LONG).show();
  }

  @Override
  public void onProviderEnabled(String provider) {
    Toast.makeText(this, "Provider enabled", Toast.LENGTH_LONG).show();
  }

  @Override
  public void onStatusChanged(String provider, int status, Bundle extras) {
    Toast.makeText(this, "Provider status changed", Toast.LENGTH_LONG)
        .show();
  }

  /**
   * Write the data to the file
   * 
   * @param data
   *            the data to be stored
   * @param file
   *            the file to store the data
   * @throws IOException
   */
  public void writeToFile(String data, File file) throws IOException {
    FileWriter writer = new FileWriter(file, true);
    writer.append(data);
    writer.flush();
    writer.close();
  }

  /**
   * Get the current time
   * 
   * @return the time in following format 'WED, 10 Oct 2012 10:00'
   */
  public String getTime() {
    SimpleDateFormat dateFormat = new SimpleDateFormat(
        "EEE, d MMM yyyy HH:mm");
    Calendar cal = Calendar.getInstance();
    return dateFormat.format(cal.getTime());
  }
}

Java Source Code List

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