FragmentMap + ActionBar Tab

Question

I\'ve been trying insert a MapView into an ActionBar Tab, but I wasn\'t able to solve the problem even googling.

Here is the Main

Answer 1

Google's Maps API Library for Android doesn't support Fragments right now.

Answer 2

Solution is to start mapview in the main activity which should extend FragmentMapActivity. Then your fragment can implement the mapview by getting it from the main activity.

Main activity:

    mMapView = new MapView(YourActivity.this, MAPS_KEY);
    mMapView.setClickable(true);
    Exchanger.mMapView = mMapView;

Fragment:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    mMapView = Exchanger.mMapView;
    return mMapView;
}

@Override
public void onDestroy() {
    if(mMapView != null) {
        NoSaveStateFrameLayout parentView = (NoSaveStateFrameLayout) mMapView.getParent();
        parentView.removeView(mMapView);
    }
    super.onDestroy();
}

Exchanger is a class with a static field with mapview in it.

Answer 3

I've solved this issue changing the onCreateView method:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if (view == null) {
        view = inflater.inflate(R.layout.fragment_geo, container, false);
    }
    return view;
}

where view is a View object.

Answer 4

I use show/hide methods to avoid creating multiple MapView in a MapActivity :

public class TabFragment extends SherlockFragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ActionBar actionBar = getSherlockActivity().getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        actionBar.addTab(actionBar
            .newTab()
            .setText("List")
            .setTabListener(
                new TabListener(((FragmentActivity) getActivity()), "listFragment", ListFragment.class)));

        actionBar.addTab(actionBar
            .newTab()
            .setText("Map")
            .setTabListener(
                new TabListener(((FragmentActivity) getActivity()), "MapFragment", MapFragment.class)));
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.tab_view, container, false);
    }

    public static class TabListener implements ActionBar.TabListener {
        private final FragmentActivity activity;
        private final String tag;
        private final Class clazz;
        private final Bundle args;
        private Fragment fragment;

        public TabListener(FragmentActivity activity, String tag, Class clz) {
            this(activity, tag, clz, null);
        }

        public TabListener(FragmentActivity activity, String tag, Class clz, Bundle args) {
            this.activity = activity;
            this.tag = tag;
            this.clazz = clz;
            this.args = args;

            // Check to see if we already have a fragment for this tab, probably from a previously saved state. If so,
            // hide it, because our initial state is that a tab isn't shown.
            fragment = activity.getSupportFragmentManager().findFragmentByTag(tag);
            if (fragment != null && !fragment.isHidden()) {
                FragmentTransaction ft = activity.getSupportFragmentManager().beginTransaction();
                ft.hide(fragment);
                ft.commit();
            }
        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            if (fragment == null) {
                fragment = Fragment.instantiate(activity, clazz.getName(), args);
                ft.add(R.id.container_fragment, fragment, tag);
            } else {
                ft.show(fragment);
            }
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            if (fragment != null) {
                ft.hide(fragment);
            }
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {
        }
    }
}