java - 如果用户不允许Android中 map 的精细位置权限，则添加默认位置

我开始学习运行时权限。我有一张地图，并且获得了我的许可。如果用户允许精确的位置-地图会缩放到其当前位置，如果用户不允许，地图会保留在该位置。我想做的而不是将地图留在原处是这样的：如果用户不允许访问其位置的权限，则地图应放大到我的自定义位置（格林威治）。

我的地图片段：

        mapView.getMapAsync(new OnMapReadyCallback() {
        @Override
        public void onMapReady(GoogleMap googleMap) {
            mMap = googleMap;

            if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                    ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)) {

                } else {
                    ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_LOCATION_REQUEST_CODE);
                }
                return;
            }

            mMap.setMyLocationEnabled(true);
            LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
            Criteria criteria = new Criteria();

//                if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION)
//                        == PackageManager.PERMISSION_GRANTED) {
//                    mMap.setMyLocationEnabled(true);
//                } else {
//                    // Show rationale and request permission.
//                }

            //Disable Map Toolbar:
            mMap.getUiSettings().setMapToolbarEnabled(false);

            // Get the name of the best provider and current location
            String provider = null;
            if (locationManager != null) {
                provider = locationManager.getBestProvider(criteria, true);
            }
            // Get current location
            Location myLocation = null;
            if (locationManager != null) {
                myLocation = locationManager.getLastKnownLocation(provider);
            }

            // Set default latitude and longitude to Greenwich
            double latitude = 51.4825766;
            double longitude = -0.0076589;

            // Get latitude and longitude of the current location and a LatLng object
            if (myLocation != null) {
                latitude = myLocation.getLatitude();
                longitude = myLocation.getLongitude();
            }

            CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(new LatLng(latitude, longitude)).zoom(14).build();
            mMap.animateCamera(CameraUpdateFactory
                    .newCameraPosition(cameraPosition));

}

最佳答案

您可以使用以下代码手动缩放到位置：

CameraUpdate center=CameraUpdateFactory.newLatLng(new LatLng(latitude,
longitude));

CameraUpdate zoom=CameraUpdateFactory.zoomTo(15);

map.moveCamera(center);
map.animateCamera(zoom);