Question

I am using the android compatibility class with the hack for using mapviews in a fragment found here: https://github.com/petedoyle/android-support-v4-googlemaps

Unfortunately, what I am finding is that if the mapfragment gets removed from the activity, and then readded, I get the “You are only allowed to have a single MapView in a MapActivity” error.”

I understand the principle behind the error, and tried destroying the mapview in the fragments onPause method. Unfortunately I can’t seem to destroy the mapview completely, since I am still getting it. My Code looks like this:

private RelativeLayout layout; 
private MapView mp;

public void onResume(){
    super.onResume();
    Bundle args = getArguments();
    if(mp == null)
    {
        mp = new MapView(getActivity(), this.getString(R.string.map_api_key)); 
        mp.setClickable(true);
    }

    String request = args.getString("requestId");
    layout = (RelativeLayout) getView().findViewById(R.id.mapholder);
    layout.addView(mp);
    //TextView txt = (TextView) getView().findViewById(R.id.arguments);
    //txt.setText(request);
}

public void onPause(){
    super.onPause();
    layout.removeView(mp);
    mp = null;
}

Does anyone have any thoughts on what the reference I am neglecting to destroy here?

Answer 1

I encountered the same issue. Here is how I solved it :

• As it should be only one instance of the mapView in the activity, I initialize it in onCreate method in Activity :

  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      // initialize MapView programmatically to be used in Fragment :
      this.mActivityMapView = new MapView(MainActivity.this, getString(R.string.debug_mapview_apikey));
  
      setContentView(R.layout.activity_main);
  }
  

• Then I recover it in the fragment onCreateView method :

  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      this.mMapView = ((MainActivity) getActivity()).getMapView();
      return this.mMapView;
  }
  

• And I destroy it in the fragment onDestroy method :

  public void onDestroy() {
      NoSaveStateFrameLayout parentView = (NoSaveStateFrameLayout) this.mMapView.getParent();
      parentView.removeView(this.mMapView);
      super.onDestroy();
  }