Re: [android-developers] Re: ItemizedOverlay using both onTap methods

I think the ideal usage would be something like this:

public boolean onTap(GeoPoint point, MapView mapView) {
// first, let the superclass check if the event hit a marker; if so,
it'll call onTap(index)
// if it returns true, that means onTap(index) returned true,
meaning the event has been handled already
if (super.onTap(point, mapView)) {
return true;
}

// the event wasn't handled as a tap on an existing marker, so let's
add a new marker
addNewMarkerAt(point);
return true;
}

public boolean onTap(int index) {
// an existing marker was tapped
// ...display info by whatever means are appropriate...
return true; // indicate that we've handled this tap, and it
shouldn't propagate to other potential handlers
}

You can override both, but the key is to call the superclass
implementation of onTap(GeoPoint, MapView) and examine its return
value.

Let me know if that helps.

Steve

On Thu, Jun 24, 2010 at 9:57 AM, Carlos Silva <r3pek@r3pek.org> wrote:
> On Thu, Jun 24, 2010 at 17:49, TreKing <trekingapp@gmail.com> wrote:
>>
>> On Jun 15, 9:15 am, tfriest <tfri...@kc.rr.com> wrote:
>> > Does anyone know of a better way to do this?
>>
>> As you've seen, the maps documentation is pretty pathetic. What I know
>> of the onTap functions has been gleamed from trial and error and
>> experimentation. This is how I believe it works:
>>
>> onTap(int) determines whether the item at the specified index will
>> handle tap events at all. If you return false, the other onTap
>> function will always return false.
>>
>> onTap(Point, MapView) determines whether an item in the overlay was
>> tapped given the touch point, if onTap(int) return true for it's
>> index.
>>
>> OK, with that, what you can do is:
>> return true for onTap(int) always.
>> in onTap(Point, MapView) call through to the base implementation to
>> determine if something was tapped. And that's it.
>>
>> public boolean onTap(point, mapview)
>> {
>>  boolean tapped = super.onTap(point, mapView);
>>  if (tapped)
>>  showInfo();
>> else
>>  dropNewItem(point);
>>
>> return true; // irrelevant if you only have one itemized overlay
>> }
>>
>> Hope that helps.
>>
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>
>
> I don't really agree with this.
> I use onTap(int) to detect if an overlayItem was clicked. And use
> onTap(point, mapview) to handle every other click on the map. I use the
> first to show a ballow, and the second to hide it.
>
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