如何在加载地图后立即获取当前位置？

Question

我有下一个问题：我想获得当前位置，然后我想在它周围画一些标记。我使用LocationListener 获取当前位置，但是当我运行我的应用程序时，我看到空地图，几秒钟后我得到当前位置并绘制标记。我想做下一个：我想在获得当前位置后加载地图。我不想看到没有标记的地图。我的代码是：

public class WhereAmIFragment extends BaseContainerFragment implements LocationListener {
private SupportMapFragment mMapFragment;
private LocationManager locationManager;

public static WhereAmIFragment newInstance() {
    return new WhereAmIFragment();
}

private GoogleMap.OnMapClickListener mOnMapClickListener = new GoogleMap.OnMapClickListener() {
    @Override
    public void onMapClick(LatLng latLng) {
    }
};

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View root = inflater.inflate(R.layout.fragment_where_am_i, container, false);
    mMapFragment = SupportMapFragment.newInstance();
    getChildFragmentManager().beginTransaction().replace(R.id.map_container, mMapFragment).commit();
    return root;
}

@Override
public void onStart() {
    super.onStart();
    mMapFragment.getMap().setMyLocationEnabled(true);
    mMapFragment.getMap().setOnMapClickListener(mOnMapClickListener);
    locationManager = (LocationManager) getActivity().getSystemService(getActivity().LOCATION_SERVICE);
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
}

@Override
public void onLocationChanged(Location location) {
    locationManager.removeUpdates(WhereAmIFragment.this);
    locationManager = null;
    drawStops(new LatLng(location.getLatitude(), location.getLongitude()));
}


private void drawStops(LatLng latLng) {
    DefaultCallback<ArrayList<Stop>> callback = new DefaultCallback<ArrayList<Stop>>(getActivity()) {
        @Override
        public void success(ArrayList<Stop> stops, Response response) {
            Log.d("myLogs", "array list size= " + stops.size());
            for (int i = 0; i < stops.size(); i++) {
                Log.d("myLogs", i + ". " + stops.get(i).getLng());
                drawMarkers(stops);
            }
        }
    };
    mMapFragment.getMap().moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 14.0f));
    RequestDataBuilder builder = new RequestDataBuilder(getActivity()).prepareWhereAmIData(
            latLng, 500);
    EwayApi api = RestAdaptersProvider.getApi(new StopsConverter());
    api.sendRequest(builder, callback);
}

private void drawMarkers(ArrayList<Stop> arrayList) {
    for (int i = 0; i < arrayList.size(); i++) {
        mMapFragment.getMap().addMarker(new MarkerOptions()
                .position(arrayList.get(i).getLng())
                .title(arrayList.get(i).getTitle()));
    }
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {

}

@Override
public void onProviderEnabled(String s) {

}

@Override
public void onProviderDisabled(String s) {

}

}

Answer 1

地图可以初始化为，

SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
map = fm.getMap();
map.setMyLocationEnabled(true);         
map.setTrafficEnabled(true);
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);

您可以添加标记，例如，

LatLng toPosition = new LatLng(Promolat, Promolon);

             map.addMarker(new MarkerOptions()
                .position(toPosition)
                .title(promotions.getPromotionHeading().toString())
                .snippet(merchants.getMerchantAddress().toString())
                .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));

             map.moveCamera(CameraUpdateFactory.newLatLngZoom(toPosition, 15));