Android Open Source - Fast G P S Tracker

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.fast;
//w  ww.  j ava2 s .c om
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;

/**
 * This tracker uses ONLY GPS.  Network based location is disabled because we need
 * accuracy for the running application.  Use it outdoors.  Code heavily borrowed from
 * the Google developer website's implementation.
 *
 */

public class GPSTracker implements LocationListener {

  private final Context mContext;
  protected LocationManager locationManager;
  

  private boolean isGPSEnabled = false;
  private boolean canGetLocation = false;

  private Location location;
  private double latitude; 
  private double longitude;
  
  private double lastLockedLatitude;
  private double lastLockedLongitude;

  /* Distance to update in METERS */
  private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; 
  
  /* Time to update in MS */
  private static final long MIN_TIME_BW_UPDATES = 1000 * 3; 
  
  
  public GPSTracker(Context context) {
    this.mContext = context;
  }

  public Location getLocation() {
    try {
      locationManager = (LocationManager) mContext.getSystemService(Service.LOCATION_SERVICE);

      isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

      if (!isGPSEnabled) {
        /* GPS is not enabled */
      } else {
        this.canGetLocation = true;
        
        if (isGPSEnabled) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
            if (locationManager != null) {  
                lastLockedLatitude = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLatitude();
                lastLockedLongitude = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER).getLongitude();
            }
        }
      }

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

    return location;
  }
  
  /**
   * Stop using GPS listener Calling this function will stop using GPS in your app
   * */
  public void startUsingGPS() {
    if (locationManager == null) {
      locationManager = (LocationManager) mContext.getSystemService(Service.LOCATION_SERVICE);
    }
  }

  /**
   * Stop using GPS listener Calling this function will stop using GPS in your app
   * */
  public void stopUsingGPS() {
    if (locationManager != null) {
      locationManager.removeUpdates(GPSTracker.this);
      locationManager = null;
      location = null;
    }
  }

  /**
   * Function to get latitude
   * */
  public double getLatitude() {
    if (location != null) {
      latitude = location.getLatitude();
    }
    return latitude;
  }

  /**
   * Function to get longitude
   * */
  public double getLongitude() {
    if (location != null) {
      longitude = location.getLongitude();
    }
    // return longitude
    return longitude;
  }
  
  public double getLastLockedLatitude(){
    return lastLockedLatitude;
  }
  
  public double getLastLockedLongitude(){
    return lastLockedLongitude;
  }

  /**
   * Function to check GPS/wifi enabled
   * 
   * @return boolean
   * */
  public boolean canGetLocation() {
    return this.canGetLocation;
  }

  /**
   * Function to show settings alert dialog On pressing Settings button will lauch Settings Options
   * */
  public void showSettingsAlert() {
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

    // Setting Dialog Title
    alertDialog.setTitle("GPS is settings");

    // Setting Dialog Message
    alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

    // On pressing Settings button
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
        Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
        mContext.startActivity(intent);
      }
    });

    // on pressing cancel button
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
        dialog.cancel();
      }
    });

    // Showing Alert Message
    alertDialog.show();
  }

  @Override
  public void onLocationChanged(Location location) {
    this.location = location;
    //Toast.makeText(mContext, location.getLatitude() + " " + location.getLongitude(), Toast.LENGTH_LONG).show();
  }

  @Override
  public void onProviderDisabled(String provider) {
  }

  @Override
  public void onProviderEnabled(String provider) {
  }

  @Override
  public void onStatusChanged(String provider, int status, Bundle extras) {
  }
}

Java Source Code List

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