谷歌地圖不顯示我的當前位置

Question

我在Android Studio中編寫代碼以顯示我在Google Map片段中的位置，但它沒有這樣做。地圖正在顯示，但我想要的座標沒有被標記。代碼如下：

public class SEMapTab extends Fragment implements OnMapReadyCallback { 

private View rootView; 
private MapFragment mMapFrag; 
private GoogleMap mMap; 
private LocationManager locationManager; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    if (rootView != null) { 
     ViewGroup parent = (ViewGroup) rootView.getParent(); 
     if (parent != null) 
      parent.removeView(rootView); 
    } 
    try { 
     rootView = inflater.inflate(R.layout.single_entity_map, container, false); 
    } catch (InflateException e) { 

    } 


    return rootView; 
} 

@Override 
public void onViewCreated(View view, Bundle savedInstanceState) { 
    if (mMapFrag == null) { 
     super.onViewCreated(view, savedInstanceState); 
     FragmentManager fragment = getActivity().getFragmentManager(); 

     mMapFrag = (MapFragment) fragment.findFragmentById(R.id.map); 


     mMapFrag.getMapAsync(this); 


    } 

    locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE); 
    if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
     // TODO: Consider calling 
     // ActivityCompat#requestPermissions 
     // here to request the missing permissions, and then overriding 
     // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
     //           int[] grantResults) 
     // to handle the case where the user grants the permission. See the documentation 
     // for ActivityCompat#requestPermissions for more details. 
     return; 
    } 

    //if network provider is enabled 
    if(locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) 
    { 
     locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, new LocationListener() { 
      @Override 
      public void onLocationChanged(Location location) { 

       double Latitude= location.getLatitude(); //Get latitude 

       double Longitude = location.getLongitude();  //Get longitude 

       LatLng latLng= new LatLng(Latitude, Longitude); 

       //Map latitude and longitude 
       mMap.addCircle(new CircleOptions().center(latLng).fillColor(Color.BLUE).radius(10)); 

       //Zoom in to current location 
       mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,18)); 


      } 

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

      } 

      @Override 
      public void onProviderEnabled(String provider) { 

      } 

      @Override 
      public void onProviderDisabled(String provider) { 

      } 
     }); 

    } 
    //else if gps provider is enabled 
    else if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) 
    { 
     locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new LocationListener() { 
      @Override 
      public void onLocationChanged(Location location) { 

       double Latitude= location.getLatitude(); //Get latitude 

       double Longitude = location.getLongitude();  //Get longitude 

       LatLng latLng= new LatLng(Latitude, Longitude); 

       //Map latitude and longitude 
       mMap.addCircle(new CircleOptions().center(latLng).fillColor(Color.BLUE).radius(10)); 

       //Zoom in to current location 
       mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,18)); 



      } 

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

      } 

      @Override 
      public void onProviderEnabled(String provider) { 

      } 

      @Override 
      public void onProviderDisabled(String provider) { 

      } 
     }); 
    } 



} 


@Override 
public void onMapReady(GoogleMap googleMap) 
{ 

} 
} 

我也包括在AndroidManifest.xml中的必要權限的文件

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

地圖片段打開，但沒有得到標註在我的當前位置的圓。另外，如果我在OnMapReady函數中對GPS位置進行硬編碼，那麼標記爲gettig並且工作正常。我請求你幫我解決這個問題。

Answer 1

At onMapReady add googleMap.setMyLocationEnabled(true)。不需要「手動」處理位置管理者和這些提供者。只需確保該用戶在調用此應用程序之前已授予應用程序訪問其位置的權限，否則該應用程序將崩潰。