How to use google map V2 inside fragment?

Question

I have a fragment which is a part of Viewpager, and I want to use Google Map V2 inside that fragment. This is what I have tried so far,

In my fragment,

    private SupportMapFragment map;       private GoogleMap mMapView;     @Override     public void onActivityCreated(Bundle savedInstanceState) {         // TODO Auto-generated method stub         super.onActivityCreated(savedInstanceState);          FragmentManager fm = getChildFragmentManager();         map = (SupportMapFragment) fm.findFragmentById(R.id.map);         if (map == null) {             map = SupportMapFragment.newInstance();             fm.beginTransaction().replace(R.id.map, map).commit();         }        }      @Override     public void onResume() {         super.onResume();         if (mMapView == null) {             mMapView = map.getMap();             Marker hamburg = mMapView.addMarker(new MarkerOptions().position(HAMBURG)                       .title("Hamburg"));                   Marker kiel = mMapView.addMarker(new MarkerOptions()                       .position(KIEL)                       .title("Kiel")                       .snippet("Kiel is cool")                       .icon(BitmapDescriptorFactory                           .fromResource(R.drawable.ic_launcher)));                     mMapView.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));                    // Zoom in, animating the camera.            mMapView.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);           }     } 

and in my layout subfragment_info.xml , I have,

<fragment             android:id="@+id/map"             class="com.google.android.gms.maps.SupportMapFragment"             android:layout_width="match_parent"             android:layout_height="300dp"             android:layout_alignParentLeft="true"             android:layout_below="@+id/tableLayout1" /> 

I can see the map now. But the markers are not showing. I think my Google map mMapView is null. Please help me to get this problem solved. Thanks in advance.

Answer 1

Create a frame for map in which it will be added in your xml layout

<RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/map_container">  <!-- The map fragments will go here -->  </RelativeLayout> 

Don't include class="com.google.android.gms.maps.SupportMapFragment" in xml either in your fragment class do get it manually inside onActivityCreated

    @Override public void onActivityCreated(Bundle savedInstanceState) {     super.onActivityCreated(savedInstanceState);     FragmentManager fm = getChildFragmentManager();     fragment = (SupportMapFragment) fm.findFragmentById(R.id.map_container);     if (fragment == null) {         fragment = SupportMapFragment.newInstance();         fm.beginTransaction().replace(R.id.map_container, fragment).commit();     }   /***at this time google play services are not initialize so get map and add what ever you want to it in onResume() or onStart() **/ }  @Override     public void onResume() {         super.onResume();         if (map == null) {             map = fragment.getMap();             map.addMarker(new MarkerOptions().position(new LatLng(0, 0)));         }     } 

if you guys face any problem Illegal State Exception Occur just write below code

/* * This issue Is tracked in (Google Bugs) * http://code.google.com/p/gmaps-api-issues/issues/detail?id=5064 Added * Code Due to Illegal State Exception Occur when reclicking on tab * * A short-term workaround that fixed it for me is to add the following to * onDetach() of every Fragment which you call */

@Override     public void onDetach() {         super.onDetach();          try {             Field childFragmentManager = Fragment.class                     .getDeclaredField("mChildFragmentManager");             childFragmentManager.setAccessible(true);             childFragmentManager.set(this, null);          } catch (NoSuchFieldException e) {             throw new RuntimeException(e);         } catch (IllegalAccessException e) {             throw new RuntimeException(e);         }     } 

//If you want to show map in activity just extend your Activity by //FragmentActivity write code mention below

In onCreate

FragmentManager fm = getSupportFragmentManager();         fragment = (SupportMapFragment) fm.findFragmentById(R.id.map_container);         if (fragment == null) {             fragment = SupportMapFragment.newInstance();             fm.beginTransaction().replace(R.id.map_container, fragment)                     .commit();     } 

In onResume

@Override     protected void onResume() {         super.onResume();         if (googleMap == null) {             initilizeMap();          }     }  private void initilizeMap() {         if (googleMap != null) {              googleMap = fragment.getMap();             googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);             googleMap.getUiSettings().setMyLocationButtonEnabled(true);             googleMap.getUiSettings().setCompassEnabled(true);             googleMap.getUiSettings().setRotateGesturesEnabled(true);              CameraPosition cameraPosition = new CameraPosition.Builder()                     .target(new LatLng(latitude, longitude)).zoom(10).build();             googleMap.animateCamera(CameraUpdateFactory                     .newCameraPosition(cameraPosition));              // create marker             MarkerOptions marker = new MarkerOptions().position(new LatLng(                     latitude, longitude));             // ROSE color icon             marker.icon(BitmapDescriptorFactory                     .defaultMarker(BitmapDescriptorFactory.HUE_ROSE));             // adding marker             googleMap.addMarker(marker);              // check if map is created successfully or not             if (googleMap == null) {                 Toast.makeText(getApplicationContext(),                         "Sorry! unable to create maps", Toast.LENGTH_SHORT)                         .show();             }         }     } 

Additional help can get from these links
https://code.google.com/p/gmaps-api-issues/issues/detail?id=5064#c1 https://developers.google.com/maps/documentation/android/map

Answer 2

You have to decide if you create your fragment in code new SupportMapFragment() or inflate from xml class="com.google.android.gms.maps.SupportMapFragment".

Actually you cannot have a Fragment in xml for another Fragment. Read about nested Fragments.

You may follow this comment on how to add nested SupportMapFragment.