未显示Google Map标记和当前位置 我是一个初学者，正在制作洗衣应用程序，我在片段地图中添加了google map的地图显示得很好，但是即使手动添加标记也无法显示地图标记，但是标记未显示并且当前位置也无法显示
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
latLng = new LatLng(location.getLatitude(), location.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(latLng).title("Your Current Location").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
askLocationPermission();
}
private void askLocationPermission() {
Dexter.withActivity(this).withPermission(Manifest.permission.ACCESS_FINE_LOCATION).withListener(new PermissionListener() {
@Override
public void onPermissionGranted(PermissionGrantedResponse response) {
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
Location lastlocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
latLng = new LatLng(lastlocation.getLatitude(), lastlocation.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(latLng).title("Your Current Location").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
}
@Override
public void onPermissionDenied(PermissionDeniedResponse response) {
}
@Override
public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
token.continuePermissionRequest();
}
}).check();
}
i am a beginner and making laundry app i added google map in fragment map is showing fine but map marker is not displaying even adding marker manually but marker not showing and current location also unable to show
