[英]Google maps not returning longitude and latitude
當我試圖在谷歌地圖上獲取我當前位置的緯度和經度時,它沒有返回任何值,也沒有啟用我的按鈕來獲取當前位置。
我是 android 的新手。
public class ChatFragment extends Fragment{
// Google Map
private GoogleMap googleMap;
GPSTracker gpsTracker = new GPSTracker(getContext());
protected String latitude,longitude;
public ChatFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View chatfrag = inflater.inflate(R.layout.chatfragment, container, false);
try {
// Loading map
initilizeMap();
} catch (Exception e) {
e.printStackTrace();
}
return chatfrag;
}
/**
* function to load map. If map is not created it will create it for you
*/
private void initilizeMap()
{
if (googleMap == null) {
SupportMapFragment mapFrag = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
googleMap = mapFrag.getMap();
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, (LocationListener) this);
Location getLastLocation = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
double currentlong = getLastLocation.getLatitude();
double currentlat = getLastLocation.getLongitude();
System.out.print(currentlat);
System.out.print(currentlong);
if (ActivityCompat.checkSelfPermission(getContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
googleMap.setMyLocationEnabled(true);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getActivity(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
}
@Override
public void onResume() {
super.onResume();
// initilizeMap();
}
}
任何形式的幫助將不勝感激。
如果你想從谷歌地圖獲取當前位置,那么試試這個,
googleMap.setMyLocationEnabled(true);
double currentlong = googleMap.getMyLocation().getLatitude();
double currentlat = googleMap.getMyLocation().getLongitude();
// if you want to get location update then implement this
googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location loc) {
// get current location update
}
});
我希望它對你有用。
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