Question

In order to detect map movements and gestures and use the lazy loading support for my map items I’m trying to work with this library: http://code.google.com/p/mapview-overlay-manager/.

I’ve setup a map attached the overlayManager and the events are coming through just fine. I can throw a toast from the listener just fine. When I get Application context it is not null.

I’m stuck trying to launch an intent from the ManagedOverlay class. Specifically in the onDoubleTap method below I’m trying to launch an intent and I get this error message:

 Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

I think I generally understand that I need to call back to the MapActivity subclass and have it launch the intent or I need to do something with the context differently. I’m having trouble ironing out the specifics however. Any assistance appreciated.

public class SiteMapRev2 extends MapActivity {

    private MapView mapView;
    private OverlayManager overlayManager;
    private MapController mapController;
    private MyLocationOverlay userLocationOverlay;
    private ArrayList<SiteSummary> sitesRoster = null;
    private Drawable siteIcon;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.map);

        mapView = (MapView) findViewById(R.id.mapview);      
        mapView.setBuiltInZoomControls(true);

        overlayManager = new OverlayManager(this, mapView);

        sitesRoster = new ArrayList<SiteSummary>(); 
        userLocationOverlay = new MyLocationOverlay(this, mapView);

        mapView.getOverlays().add(userLocationOverlay);
        mapController = mapView.getController();
        mapController.setZoom(14);
        siteIcon = this.getResources().getDrawable(R.drawable.marker2);

    }



    @Override
    public void onStart() {
        super.onStart();
        Drawable defaultmarker = getResources().getDrawable(R.drawable.marker2);

        ManagedOverlay managedOverlay = overlayManager.createOverlay("sites", defaultmarker);

        managedOverlay.setOnOverlayGestureListener(new ManagedOverlayGestureDetector.OnOverlayGestureListener(){

            public boolean onDoubleTap(MotionEvent arg0, ManagedOverlay arg1,
                    GeoPoint arg2, ManagedOverlayItem arg3) {

                if (arg3 == null) {
                    return false;
                }
                else {
                    **SiteOverlayItem thisItem = (SiteOverlayItem) arg3;
                    String siteIDAsString = Integer.toString(thisItem.getSiteID());
                    Context c = getApplicationContext();
                    Intent showSiteDetails = new Intent(c,SiteDetailActivity.class);
                    Log.d(toString(), "intent = " + showSiteDetails.toString());
                    showSiteDetails.setData(Uri.parse(siteIDAsString));
                    c.startActivity(showSiteDetails);
                    return true;**
                }

            }

Answer 1

Instead of getting the application context, I would do this:

SiteMapRev2.this.startActivity(showSiteDetails);

which starts the activity from your map activity as you normally would.