GPSTracker.java

package client.smrtms.com.smrtms_client.controller;


import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.LocationListener;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;


/**
 * GPS Tracker
 *
 * Class to get Current GPS Information
 *
 */
public class GPSTracker implements LocationListener {

    private final Context mContext;

    // Flag for GPS status
    boolean isGPSEnabled = false;

    // Flag for network status
    boolean isNetworkEnabled = false;

    // Flag for GPS status
    boolean canGetLocation = false;

    public Location location; // Location
    double latitude; // Latitude
    double longitude; // Longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 600; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();


    }






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

            // Getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // Getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {

            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // If GPS enabled, get latitude/longitude using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }


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


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

        // return latitude
        return latitude;
    }


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

        // return longitude
        return longitude;
    }

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

    public final static double AVERAGE_RADIUS_OF_EARTH = 6371;

    public Double calculateDistance(Double destLat, Double destLng)
    {
        double userLat = getLatitude();
        double userLng = getLongitude();
        double latDistance = Math.toRadians(userLat - destLat);
        double lngDistance = Math.toRadians(userLng - destLng);

        double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2)
                + Math.cos(Math.toRadians(userLat)) * Math.cos(Math.toRadians(destLat))
                * Math.sin(lngDistance / 2) * Math.sin(lngDistance / 2);

        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

        return AVERAGE_RADIUS_OF_EARTH * c;

    }





    @Override
    public void onLocationChanged(Location location)
    {
        if(LoginUser.getInstance() != null)
        {
            this.location = location;
            LoginUser.getInstance().setLatitude(location.getLatitude());
            LoginUser.getInstance().setLongitude(location.getLongitude());
        }
    }


    @Override
    public void onProviderDisabled(String provider) {

    }


    @Override
    public void onProviderEnabled(String provider) {
    }


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

/*
	private final Handler handler = new Handler() {
		public void handleMessage(Message msg) {
			if(msg.arg1 == 1){
				if (!isFinishing()) { // Without this in certain cases application will show ANR
					AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
					builder.setMessage("Your GPS is disabled! Would you like to enable it?").setCancelable(false).setPositiveButton("Enable GPS", new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int id) {
							Intent gpsOptionsIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
							Activity.startActivity(gpsOptionsIntent);
						}
					});
					builder.setNegativeButton("Do nothing", new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int id) {
							dialog.cancel();
						}
					});
					AlertDialog alert = builder.create();
					alert.show();
				}
			}


		}
	};*/

}