CODEWITHSUNDEEP
android
Richard
Richard

Reputation: 11

Confused about onTap

I'm a bit confused about the onTap method(s) and how they work with ItemizedOverlay. I want the user to tap on the map and then I place an OverlayItem (icon) where they tapped. Then I want them to tap that OverlayItem again to confirm the location.

I can add the OverlayItem to the map no problems by overriding 

public boolean onTap(GeoPoint p, MapView mapView)

But then I want to capture the user tapping on that item by overriding 

protected boolean onTap(int i)

The trouble is, when I override BOTH of these methods, the second method is never executed when I tap my icon item.

I've followed all the examples but I'm still stuck. Could someone give me an idea what I'm doing wrong please?

Thanks

Upvotes: 0

Views: 1105

Answers (2)

Richard
Richard

Reputation: 11

Thanks for the reply. The super.onTap seems to be the thing I was missing. These are my methods, so you see the 'GeoPoint' version of onTap is the main entry point, and it works! The link I posted was also very helpful.

    @Override
    public boolean onTap(GeoPoint p, MapView mapView) {
        // If it was the parent that was tapped, do nothing
        if(super.onTap(p, mapView)) {
            return true;
        }
        else {
            lastClickedLocation = p;
            mapView.getController().animateTo(lastClickedLocation);                                 
            if(markerItem == null) {
                markerItem = new OverlayItem(lastClickedLocation, "", "");
                items.add(markerItem);
            }
            else {
                items.remove(markerItem);
                markerItem = new OverlayItem(lastClickedLocation, "", "");
                items.add(markerItem);
            }
            Utils.alert(parent.getApplicationContext(), parent.getResources().getString(R.string.tapAgainToConfirm));
            populate();
            return true;
        }           
    }

    /**
     * Override the onTap(index) method
     */
    @Override
    protected boolean onTap(int i) {
        parent.confirmLocation(items.get(i));
        return true;
    }

Upvotes: 1

CommonsWare
CommonsWare

Reputation: 1007349

I have not tried this, but I think it will work:

Try chaining to the superclass from the GeoPoint-flavored onTap(). That should give you the default processing of calling the index-flavored onTap(). Override that method to find out when the user taps on an existing marker and return true to indicate you handled the event. Back in the GeoPoint-flavored onTap(), if super.onTap() returns true, that means the event was handled by somebody (such as you). Therefore, if it is false, add a marker at the supplied GeoPoint.

Upvotes: 0

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