Android 谷歌地图位置管理器无法在 SupportMapFragment 中工作

Question

我目前正在尝试将谷歌地图包含到我的应用程序中。主要目的是在加载 map 后自动将相机移动到具有缩放功能的设备当前位置。

为此，我需要一个位置管理器。在下面的代码中，我试图实现一个，但没有成功。我还尝试从 fragment 类传递上下文。

但我仍然从 eclipse 收到此消息:方法 getSystemService(String) 未定义类型导航

知道我做错了什么吗？

public class Navigation extends SupportMapFragment {

private GoogleMap map;
private Context mContext;

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);

    View v = inflater.inflate(R.layout.activity_navigation, null, false);
    getContextFromConfig();

    setUpMapIfNeeded();

    return v;
}

private void getContextFromConfig()
{
    ContextConfig config = new ContextConfig();
    mContext = config.getContext();
}


@Override
public void onResume() {
    super.onResume();
    setUpMapIfNeeded();
}

private void setUpMapIfNeeded() {

    if (map == null) {
        map = ((SupportMapFragment) getFragmentManager().findFragmentById(
                R.id.map)).getMap();
    } else {
        System.out.println("Google Maps is not available.");
    }

    if (map != null) {
        setUpMap();
    }
}

private void setUpMap() {
    map.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker").snippet("snippet"));
    // Enable MyLocation Layer of Google Map
    map.setMyLocationEnabled(true);

    // Get LocationManager object from System Service LOCATION_SERVICE
    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    // Create a criteria object to retrieve provider
    Criteria criteria = new Criteria();

    // Get the name of the best provider
    String provider = locationManager.getBestProvider(criteria, true);

    // Get Current Location
    Location myLocation = locationManager.getLastKnownLocation(provider);

    //set map type
    map.setMapType(GoogleMap.MAP_TYPE_NORMAL);

    // Get latitude of the current location
    double latitude = myLocation.getLatitude();

    // Get longitude of the current location
    double longitude = myLocation.getLongitude();

    // Create a LatLng object for the current location
    LatLng latLng = new LatLng(latitude, longitude);      

    // Show the current location in Google Map        
    map.moveCamera(CameraUpdateFactory.newLatLng(latLng));

    // Zoom in the Google Map
    map.animateCamera(CameraUpdateFactory.zoomTo(14));
    map.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("You are here!"));
}

Answer 1

getSystemService() 是Context 的方法，不是Fragment 的方法。你可能想这样做:

LocationManager locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);

或者这个:

LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);