LaunchGoogleMap.swift

    //SOURCE: https://developers.google.com/maps/documentation/ios-sdk/urlscheme
    func startNavigation(dropLocation: CLLocation, startLocation: CLLocation?) {
        
        let dCoordinate = dropLocation.coordinate
        let dLatitude = dCoordinate.latitude
        let dLogitude = dCoordinate.longitude

        
        let baseURL = "comgooglemaps-x-callback://"
        var navigationURL: String?
        guard let URL = NSURL(string: baseURL) else {
            return
        }
        let canOpenURL = UIApplication.sharedApplication().canOpenURL(URL)
        
        if canOpenURL {
            guard let appURLScheme = Utility.getCurrentAppURLScheme() else {
                return
            }
            
            guard let bundleDisplayName = Utility.getBundleDisplayName() else {
                return
            }
            
            navigationURL = baseURL +
             "?daddr=\(dLatitude),\(dLogitude)" +
             //"&saddr=\(sLatitude),\(sLogitude)" +
             "&mapmode=streetview" +
             "&views=driving" +
             "&x-success=\(appURLScheme)://?resume=true" +
             "&x-source=\(bundleDisplayName)"
            
        } else {
            navigationURL = "https://itunes.apple.com/in/app/google-maps-navigation-transport/id585027354?mt=8"
        }
        
        launchAnAppFromURL(navigationURL)
    }
    
    func launchAnAppFromURL(stringURL: String?) {
        
        guard let stringURL = stringURL else {
            return
        }
        
        if let URLToOpen = NSURL(string: stringURL) {
            UIApplication.sharedApplication().openURL(URLToOpen)
        }
        
    }