Question

我创建了导航抽屉活动以使用地图片段显示我的地图。我的地图可见，但指向错误的位置。我想显示我的当前位置。我已检查清单中的权限。我不知道我到底在哪里做错了。

这是mapFragment.java文件

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_map, container, false);
    return v;

}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {

    super.onViewCreated(view, savedInstanceState);
    SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
    locationManager = (LocationManager) getActivity().getSystemService(LOCATION_SERVICE);
    if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(getActivity(), new String[]
                        {Manifest.permission.ACCESS_FINE_LOCATION},
                REQUEST_LOCATION_PERMISSION);
    }
    locationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            double latitude = location.getLatitude();
            double longitude = location.getLongitude();


            //get the location name from latitude and longitude
            Geocoder geocoder = new Geocoder(getActivity().getApplicationContext());
            try {
                List<Address> addresses =
                        geocoder.getFromLocation(latitude, longitude, 1);
                String result = addresses.get(0).getLocality() + ":";
                result += addresses.get(0).getCountryName();
                LatLng latLng = new LatLng(latitude, longitude);
                map.addMarker(new MarkerOptions().position(latLng).title(result));
                map.setMaxZoomPreference(20);
                map.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 12.0f));

            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
        }

        @Override
        public void onProviderEnabled(String provider) {
        }

        @Override
        public void onProviderDisabled(String provider) {
        }
    };
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}

Answer 1

使用此代码：

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_map, container, false);
    return v;

}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {

    super.onViewCreated(view, savedInstanceState);
    SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
    locationManager = (LocationManager) getActivity().getSystemService(LOCATION_SERVICE);

// changes here
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
        if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(getActivity(), new String[]
                            {Manifest.permission.ACCESS_FINE_LOCATION},
                    REQUEST_LOCATION_PERMISSION);
        }
        locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                double latitude = location.getLatitude();
                double longitude = location.getLongitude();


                //get the location name from latitude and longitude
                Geocoder geocoder = new Geocoder(getActivity().getApplicationContext());
                try {
                    List<Address> addresses =
                            geocoder.getFromLocation(latitude, longitude, 1);
                    String result = addresses.get(0).getLocality() + ":";
                    result += addresses.get(0).getCountryName();
                    LatLng latLng = new LatLng(latitude, longitude);
                    map.addMarker(new MarkerOptions().position(latLng).title(result));
                    map.setMaxZoomPreference(20);
                    map.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 12.0f));

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {
            }

            @Override
            public void onProviderEnabled(String provider) {
            }

            @Override
            public void onProviderDisabled(String provider) {
            }
        };

    }

标记在Google地图上显示的位置错误

1 个答案: