Initialisation de la carte dans le fragment

Question

J'ai un problème lors de l'initialisation de ma carte. Le fragment de carte est gonflé dans le FrameLayout de l'activité principale. Je continue d'obtenir une exception de pointeur null dans la méthode setUpMapIfNeeded().

activity_main.xml

<LinearLayout 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      android:orientation="vertical"> 

`   
     <include layout="@layout/toolbar"/> 

     <FrameLayout 
       android:id="@+id/frameLayout" 
       android:layout_width="fill_parent" 
       android:layout_height="fill_parent"></FrameLayout> 
    </LinearLayout> 



    <android.support.design.widget.NavigationView 
      android:id="@+id/navigation_view" 
      android:layout_height="match_parent" 
      android:layout_width="wrap_content" 
      android:layout_gravity="start" 
      app:headerLayout="@layout/header" 
      app:menu="@menu/drawer" 
      /> 

</android.support.v4.widget.DrawerLayout> 

map_fragment.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       xmlns:tools="http://schemas.android.com/tools" 
       android:orientation="vertical" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent"> 


    <fragment 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:id="@+id/map" 
      tools:context=".MapFragment" 
      android:name="com.google.android.gms.maps.SupportMapFragment"/> 

</LinearLayout> 

MainActivity.java

switch (menuItem.getItemId()) { 
       case R.id.shop: 

        MapFragment mapFragment = new MapFragment(); 
        android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
        fragmentTransaction.replace(R.id.frameLayout,mapFragment); 
        fragmentTransaction.commit(); 

        break; 
       case R.id.list: 
        ListFragment listFragment = new ListFragment(); 
        android.support.v4.app.FragmentTransaction fragmentTransaction1 = getSupportFragmentManager().beginTransaction(); 
        fragmentTransaction1.replace(R.id.frameLayout,listFragment); 
        fragmentTransaction1.commit(); 

        break; 
       case R.id.points: 
        Toast.makeText(getApplicationContext(),"Global card selected",Toast.LENGTH_SHORT).show(); 
        break; 
      } 
      return true; 
     } 
    }); 

MapFragment.java

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.map_fragment,container,false); 

    //Check if GPS is enabled 
    locationManager = (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE); 
    if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){ 
     Toast.makeText(getContext(),"GPS enabled",Toast.LENGTH_SHORT).show(); 
    }else { 
     showGPSDisabledAlertToUser(); 
    } 

    setUpMapIfNeeded(); 
    return view; 
} 

private void setUpMapIfNeeded() { 
    // Do a null check to confirm that we have not already instantiated the map. 
    if (mMap == null) { 
     // Try to obtain the map from the SupportMapFragment. 
     //I get a null pointer exception at this point, no map it gotten 
     mMap = ((SupportMapFragment)getActivity().getSupportFragmentManager().findFragmentById(R.id.map)) 
       .getMap(); 
     // Check if we were successful in obtaining the map. 
     if (mMap != null) { 
      setUpMap(); 
     } 
    } 
} 

Answer 1

Jetez un coup d'oeil à mon repo pour mapTab here. Il montre comment initialiser la carte Google pour dans le fragment.

Exemple de code:

public class MapTabFragment extends Fragment { 

    private SupportMapFragment mMapView; 

    public static MapTabFragment newInstance(String param1, String param2) { 
     MapTabFragment fragment = new MapTabFragment(); 
     return fragment; 
    } 

    MapView mapView; 
    GoogleMap map; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.fragment_map, container, false); 
     // Gets the MapView from the XML layout and creates it 

     MapsInitializer.initialize(getActivity()); 


     switch (GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity())) { 
      case ConnectionResult.SUCCESS: 
       Toast.makeText(getActivity(), "SUCCESS", Toast.LENGTH_SHORT).show(); 
       mapView = (MapView) v.findViewById(R.id.map); 
       mapView.onCreate(savedInstanceState); 
       // Gets to GoogleMap from the MapView and does initialization stuff 
       if (mapView != null) { 
        map = mapView.getMap(); 
        map.getUiSettings().setMyLocationButtonEnabled(false); 
        map.setMyLocationEnabled(true); 
        CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(new LatLng(43.1, -87.9), 10); 
        map.animateCamera(cameraUpdate); 
       } 
       break; 
      case ConnectionResult.SERVICE_MISSING: 
       Toast.makeText(getActivity(), "SERVICE MISSING", Toast.LENGTH_SHORT).show(); 
       break; 
      case ConnectionResult.SERVICE_VERSION_UPDATE_REQUIRED: 
       Toast.makeText(getActivity(), "UPDATE REQUIRED", Toast.LENGTH_SHORT).show(); 
       break; 
      default: 
       Toast.makeText(getActivity(), GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity()), Toast.LENGTH_SHORT).show(); 
     } 

     // Updates the location and zoom of the MapView 

     LatLng sydney = new LatLng(-33.867, 151.206); 

     map.setMyLocationEnabled(true); 
     map.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 13)); 

     map.addMarker(new MarkerOptions() 
       .title("Sydney") 
       .snippet("The most populous city in Australia.") 
       .position(sydney)); 

     return v; 
    } 

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

    @Override 
    public void onDestroy() { 
     super.onDestroy(); 
     mapView.onDestroy(); 
    } 

    @Override 
    public void onLowMemory() { 
     super.onLowMemory(); 
     mapView.onLowMemory(); 
    } 
} 

XML pour cela:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent"> 

    <com.google.android.gms.maps.MapView 
     android:id="@+id/map" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:name="com.bojie.materialtest.fragments.UpcomingFragment"/> 

</RelativeLayout>