android - 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