解决 GoogleMap.setMyLocationEnabled 所需的权限缺失问题

Question

我正在使用 Google 地图在 Fragment 中显示我的 Office 位置。当我编译并运行应用程序时，它会显示地图但不会标记我的位置。

在片段 java 文件上，map.setMyLocationEnabled(true);

被红色下划线了，不知道怎么解决。

下面是我在 Fragment maps 中的代码。

public class maps extends Fragment implements OnMapReadyCallback {

    private Context mContext;
    private SupportMapFragment supportMapFragment;
    private GoogleMap map;
    private MarkerOptions currentPositionMarker = null;
    private Marker currentLocationMarker;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        mContext = getActivity();
        return inflater.inflate(R.layout.fragment_maps, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        mContext = getActivity();

        FragmentManager fm = getActivity().getSupportFragmentManager();/// getChildFragmentManager();
        supportMapFragment = (SupportMapFragment) fm.findFragmentById(R.id.map_container);
        if (supportMapFragment == null) {
            supportMapFragment = SupportMapFragment.newInstance();
            fm.beginTransaction().replace(R.id.map_container, supportMapFragment).commit();
        }
        supportMapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        map = googleMap;
        if (ActivityCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        map.setMyLocationEnabled(true);
        map.animateCamera(CameraUpdateFactory.zoomTo(15));
        /*map.setOnMapLongClickListener(MapyFragment.this);
        map.setOnMapClickListener(MapFragment.this);*/
    }

    public void updateCurrentLocationMarker(Location currentLatLng){

        if(map != null){

            LatLng latLng = new LatLng(currentLatLng.getLatitude(),currentLatLng.getLongitude());
            if(currentPositionMarker == null){
                currentPositionMarker = new MarkerOptions();

                currentPositionMarker.position(latLng)
                        .title("My Location").
                        icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_facebook_3));
                currentLocationMarker = map.addMarker(currentPositionMarker);
            }

            if(currentLocationMarker != null)
                currentLocationMarker.setPosition(latLng);

            ///currentPositionMarker.position(latLng);
            map.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        }
    }
}

提前致谢。

Answer 1

对于当前位置，您可以通过在 google 官方文档下方找到的适当示例找到最佳解决方案。你自己试试吧，它会探索你的。

https://developers.google.com/maps/documentation/android-api/current-places-tutorial?hl=pt-br