GPSUtility.java

package com.rogergcc.workplaycontacts.helper;

import android.annotation.SuppressLint;
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.os.IBinder;
import android.provider.Settings;
import android.util.Log;

/**
 * Credit to http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial/
 */
public class GPSUtility extends Service implements LocationListener {
    /**
     * Miles per meter.
     */
    // This is a float since Location.distanceTo returns a float
    private final static float MILES_PER_METER = 0.000621371f;
    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60; // 1 minute
    private final Context mContext;
    // Declaring a Location Manager
    protected LocationManager locationManager;
    // flag for GPS status
    boolean isGPSEnabled = false;
    // flag for network status
    boolean isNetworkEnabled = false;
    // flag for GPS status
    boolean canGetLocation = false;
    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

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

    /**
     * Calculates the distance between two latitude, longitude coordinates and
     * returns the result in miles rounded to one digit after the decimal place.
     *
     * @param lat1  Latitude of first coordinate.
     * @param long1 Longitude of first coordinate.
     * @param lat2  Latitude of second coordinate.
     * @param long2 Longitude of second coordinate.
     * @return the distance in miles between the two latitude longitude points.
     */
    public static double calculateGPSDistance(double lat1, double long1, double lat2, double long2) {
        float[] results = new float[1];
        Location.distanceBetween(lat1, long1, lat2, long2, results);
        return round((double) (results[0] * MILES_PER_METER), 1);
    }

    /**
     * Rounds double to a specified number of places after the decimal.
     *
     * @param value  Value being rounded.
     * @param places Places after the decimal to round to.
     * @return value rounded to the specified number of places after the decimal.
     */
    private static double round(double value, int places) {
        long factor = (long) Math.pow(10, places);
        value = value * factor;
        long tmp = Math.round(value);
        return (double) tmp / factor;
    }

    @SuppressLint("MissingPermission")
    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

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

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

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                // First get location from Network Provider
                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 lat/long 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(GPSUtility.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/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 needed");

        // 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();
    }

    /**
     * Gets the current GPS location. If the user doesn't have GPS enabled pops
     * up an alert dialog allowing the user to access settings and enable GPS.
     * If GPS still isn't enabled, pops up an alert dialog displaying an error.
     *
     * @return the current GPS location of the user.
     */
//	    public Location promptForGPS() {
//	    	if (!canGetLocation())
//	    		showSettingsAlert();
//
//	    	if (canGetLocation())
//	    		return getLocation();
//	    	else {
//	    		AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
//	    		builder
//	    			.setTitle("Error")
//	    			.setMessage("No GPS enabled")
//	    			.setPositiveButton("Okay", null)
//	    			.show();
//	    		return null;
//	    	}
//	    }
    public Location promptForGPS() {
        if (!canGetLocation())
            showSettingsAlert();

        if (canGetLocation())
            return getLocation();
        else
            return null;

//        if (canGetLocation())
//            return getLocation();
//        else {
//            AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
//            builder
//                    .setTitle("Error")
//                    .setMessage("No GPS enabled")
//                    .setPositiveButton("Okay", null)
//                    .show();
//            return null;
//        }

    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

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

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}