在Google地圖上獲取當前位置

Question

當我想獲取當前位置時遇到了一些麻煩。

這是我第一次使用這個通用汽車公司的API，有太多東西我不明白。

這裏是我的代碼，我想

var geocoder = new google.maps.Geocoder(); 

function initialize() { 
    var latLng = new google.maps.LatLng(-7.7801502, 110.3846387); 
    var map = new google.maps.Map(document.getElementById('mapCanvas'), { 
    zoom: 15, 
    center: latLng, 
    mapTypeId: google.maps.MapTypeId.ROADMAP 
    }); 

    var marker = new google.maps.Marker({ 
    position: latLng, 
    title: 'Ambarrukmo Plaza Yogyakarta', 
    map: map, 
    draggable: true 
    }); 
} 

的問題是，我想改變-7.7801502和110.3846387值自動根據用戶的當前位置。我可以那樣做嗎？

以前感謝您的幫助和解釋。

另一個問題： - >如果我要根據嵌入GPS的設備更改這些值，該怎麼辦？

Answer 1

您無法通過Google地圖獲取當前用戶的位置。但是，如果您使用Google Loader獲得Google地圖，則可以使用google.loader.CurrentLocation獲取基於IP的位置。其他方式是使用HTML5 GeoLocation API。

function getLocation() { 
    if (navigator.geolocation) { 
    navigator.geolocation.getCurrentPosition(showPosition); 
    } else { 
    alert("Geolocation is not supported by this browser."); 
    } 
} 
function showPosition(position) { 
    var lat = position.coords.latitude; 
    var lng = position.coords.longitude; 
    map.setCenter(new google.maps.LatLng(lat, lng)); 
} 

Answer 2

如果你想留在谷歌地圖API的世界，假設你有，你可以使用地圖變量，

var map = new google.maps.Map(document.getElementById("map-canvas"), 
     mapOptions); 

var myLat = map.center.k; 
var myLng = map.center.B; 

，或者您可以使用，

alert("Lat="+map.center.k); 
alert("Lng="+map.center.B); 

Answer 3

對於未來尋找解決方案的人，Google現在在Google地圖頁面上有一個地理位置示例>https://developers.google.com/maps/documentation/javascript/examples/map-geolocation

Answer 4

import UIKit 
import GoogleMaps 
import GooglePlaces 
import CoreLocation 

class ViewController: UIViewController,CLLocationManagerDelegate,GMSMapViewDelegate { 

@IBOutlet weak var currentlocationlbl: UILabel! 


var mapView:GMSMapView! 

var locationManager:CLLocationManager! = CLLocationManager.init() 

var geoCoder:GMSGeocoder! 

var marker:GMSMarker! 

var initialcameraposition:GMSCameraPosition! 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    self.mapView = GMSMapView() 
    self.geoCoder = GMSGeocoder() 
    self.marker = GMSMarker() 
    self.initialcameraposition = GMSCameraPosition() 

    // Create gms map view-------------> 
    mapView.frame = CGRect(x: 0, y: 150, width: 414, height: 667) 
    mapView.delegate = self 
    mapView.isMyLocationEnabled = true 
    mapView.isBuildingsEnabled = false 
    mapView.isTrafficEnabled = false 
    self.view.addSubview(mapView) 

    // create cureent location label----------> 

    self.currentlocationlbl.lineBreakMode = NSLineBreakMode.byWordWrapping 
    self.currentlocationlbl.numberOfLines = 3 
    self.currentlocationlbl.text = "Fetching address.........!!!!!" 

    locationManager.delegate = self 
    locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation 
    if locationManager.responds(to: #selector(CLLocationManager.requestAlwaysAuthorization)) 
    { 
     self.locationManager.requestAlwaysAuthorization() 
    } 
    self.locationManager.startUpdatingLocation() 

    if #available(iOS 9, *) 
    { 
    self.locationManager.allowsBackgroundLocationUpdates = true 
    } 
    else 
    { 
     //fallback earlier version 
    } 
    self.locationManager.startUpdatingLocation() 


    self.marker.title = "Current Location" 
    self.marker.map = self.mapView 


    // Gps button add mapview 

    let gpbtn:UIButton! = UIButton.init() 
    gpbtn.frame = CGRect(x: 374, y: 500, width: 40, height: 40) 
    gpbtn.addTarget(self, action: #selector(gpsAction), for: .touchUpInside) 
    gpbtn.setImage(UIImage(named:"gps.jpg"), for: .normal) 
    self.mapView.addSubview(gpbtn) 
    } 

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) 
{ 
    var location123 = CLLocation() 

    location123 = locations[0] 

    let coordinate:CLLocationCoordinate2D! = CLLocationCoordinate2DMake(location123.coordinate.latitude, location123.coordinate.longitude) 

    let camera = GMSCameraPosition.camera(withTarget: coordinate, zoom: 16.0) 

    self.mapView.camera = camera 
    self.initialcameraposition = camera 
    self.marker.position = coordinate 
    self.locationManager.stopUpdatingLocation() 

} 


func mapView(_ mapView: GMSMapView, idleAt position: GMSCameraPosition) 
{ 
    self.currentAddres(position.target) 
} 

func currentAddres(_ coordinate:CLLocationCoordinate2D) -> Void 
{ 
    geoCoder.reverseGeocodeCoordinate(coordinate) { (response, error) in 

     if error == nil 
     { 
      if response != nil 
      { 

       let address:GMSAddress! = response!.firstResult() 

       if address != nil 
       { 
        let addressArray:NSArray! = address.lines! as NSArray 

        if addressArray.count > 1 
        { 
         var convertAddress:AnyObject! = addressArray.object(at: 0) as AnyObject! 
         let space = "," 
         let convertAddress1:AnyObject! = addressArray.object(at: 1) as AnyObject! 
         let country:AnyObject! = address.country as AnyObject! 

         convertAddress = (((convertAddress.appending(space) + (convertAddress1 as! String)) + space) + (country as! String)) as AnyObject 

         self.currentlocationlbl.text = "\(convertAddress!)".appending(".") 
        } 
        else 
        { 
         self.currentlocationlbl.text = "Fetching current location failure!!!!" 
        } 

       } 


      } 
     } 
    } 
} 

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