Question

I am having an issue with my mapview – I populate it with a AsyncTask, but after it completes the points don’t show up until the screen is tapped (after the first touch all the points show up properly).

Oncreate:

dialog = ProgressDialog.show(MyMap.this, “Populating Map”,
“Please wait…”, true);

new AddOverlays().execute();

My AsyncTask:

class AddOverlays extends AsyncTask <Void, Void, String>{
        @Override
        protected String doInBackground(Void... unsued) {

                //do my looping work to add items to map

            mapOverlays.add(itemizedOverlay);   

            String nothing = "";
            return nothing;
        }

        @Override
        protected void onProgressUpdate(Void... unsued) {

        }

        @Override
        protected void onPostExecute(String sResponse) {
            if (dialog.isShowing())
                dialog.dismiss();
        }
    }

Answer 1

Try calling:
invalidate() from UI thread
or
postInvalidate() from another thread

on your MapView object to make the map view repaint.

You should call mapOverlays.add(itemizedOverlay); in onPostExecute(String sResponse) as adding a new overlay is not an expensive operation.

I suppose you will do some kind of expensive operation in doInBackground(Void... unused) because as of right now you don’t really need the whole AddOverlays task.