android– 我无法在谷歌地图中检索我当前的经度和纬度

概述我使用以下代码来获取我当前位置的lat和lang,但它在CameraPosition中给我null值.任何想法为什么？privatevoidmoveMapToMyLocation(){LocationManagerlocMan=(LocationManager)MapsActivity.this.getSystemService(Context.LOCATION_SERVICE);Criteriacrit

我使用以下代码来获取我当前位置的lat和lang,但它在Cameraposition中给我null值.任何想法为什么？

   private voID moveMapToMyLocation() {    LocationManager locMan = (LocationManager) MapsActivity.this.getSystemService(Context.LOCATION_SERVICE);    Criteria crit = new Criteria();    Location loc = locMan.getLastKNownLocation(LocationManager.GPS_PROVIDER);    Cameraposition camPos = new Cameraposition.Builder()            .target(new LatLng(loc.getLatitude(), loc.getLongitude()))            .zoom(12.8f)            .build();    CameraUpdate camUpdate = CameraUpdateFactory.newCameraposition(camPos);   mMap.moveCamera(camUpdate);}

解决方法:

这是帮助类,它管理与GPS相关的 *** 作.

 public class GPSTracker  extends Service 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;        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 = 1000 * 60 * 1; // 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(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) {                        try                        {                            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_disTANCE_CHANGE_FOR_UPDATES, this);                        }                        catch (SecurityException e)                        {                        }                        Log.d("Network", "Network");                        if (locationManager != null) {                            try                            {                                location = locationManager                                        .getLastKNownLocation(LocationManager.NETWORK_PROVIDER);                            }                            catch (SecurityException e)                            {                            }                            if (location != null) {                                latitude = location.getLatitude();                                longitude = location.getLongitude();                            }                        }                    }                    // if GPS Enabled get lat/long using GPS Services                    if (isGPSEnabled) {                        if (location == null) {                            try                            {                                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 (SecurityException s)                            {                            }                        }                    }                }            } 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){                try                {                    locationManager.removeUpdates(GPSTracker.this);                }                catch (SecurityException e)                {                }            }        }        /**         * 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 Settings");            // Setting Dialog Message            alertDialog.setMessage("GPS is not active. Do you want to open?");            // 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) {        }        @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;        }    }

成功创建GPSTracker课程后,您需要在想要获取纬度和经度的活动中调用它.在onCreate方法中使用以下代码行.

    GPSTracker gps;    double latitude;    double longitude;    gps = new GPSTracker(getActivity());    // check if GPS enabled    if(gps.canGetLocation())    {        latitude = gps.getLatitude();        longitude = gps.getLongitude();    }    else    {        gps.showSettingsAlert();    }

我们走到了尽头.请确保提供所有权限

<uses-permission androID:name="androID.permission.ACCESS_COARSE_LOCATION"/><uses-permission androID:name="androID.permission.ACCESS_FINE_LOCATION"/>

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