Thanks for your post !
Helped me so much !!
On 15 Jul., 17:09, Piwaï <py.ri...@gmail.com> wrote:
> Hi all !
>
> I want to share with you the solution to a weird problem I was having.
> I think it was mostly due to my misunderstanding of the way
> ItemizedOverlay works. I couldn't find the sources, and the usage is
> not much documented. Hopefully I could connect the debugger and dig...
>
> I have a dynamic ItemizedOverlay, which means that from time to time I
> update the list of items inside it, removing some and adding others.
>
> When I would sometimes click on an item, than update the items, than
> click again on another item, an ArrayIndexOutOfBoundsException was
> thrown.
>
> I thought that calling the "populate()" method was enought to get the
> Overlay updated, and that I only needed to override the createItem(int
> i) and size() methods.
>
> However, one should also call this :
>
> setLastFocusedIndex(-1);
>
> The ItemizedOverlay remembers the index of the last focused item, and
> does some stuff with it when you focus on a new item (by clicking on
> it for instance). If you change the list of items, then the
> "lastFocusedIndex" has no more meaning.
>
> I think that this should be written in the documentation, or that
> setLastFocusedIndex(-1); should be called from the populate() method.
>
> One more thing : I think that the minimal touchable bounds of a
> drawable should be customizable. I was playing with the map on the
> emulator, and I was surprised that click quite far away from a pin
> would still get it "tapped". I realized that the minimal box for an
> item is 100*100 pixels, which is quite large...
>
> Here is a sample code to show how to use a dynamic ItemizedOverlay,
> and to customize the minimal size of a box (I have simplified it from
> my real class, to show only the interesting stuff).
>
> public class FaultStationOverlay extends
> ItemizedOverlay<FaultStationItem> {
>
> private ArrayList<FaultStationItem> faultStations
> = new
> ArrayList<FaultStationItem>();
>
> private Drawable normalMarker;
> private Drawable
> fewFaultsMarker;
> private Drawable
> muchFaultsMarker;
>
> private Rect
> touchableBounds = new Rect();
>
> private static final int MIN_TOUCHABLE_WIDTH
> = 10;
> private static final int MIN_TOUCHABLE_HEIGHT
> = 10;
>
> public FaultStationOverlay(Drawable normalMarker, Drawable
> fewFaultsMarker,
> Drawable muchFaultsMarker) {
> super(normalMarker);
> this.normalMarker = boundCenterBottom(normalMarker);
> this.fewFaultsMarker = boundCenterBottom(fewFaultsMarker);
> this.muchFaultsMarker = boundCenterBottom(muchFaultsMarker);
>
> populate();
> }
>
> public void updateStations(List<Station> stations) {
> faultStations.clear();
> for (Station station : stations) {
> FaultStationItem stationItem = new
> FaultStationItem(station);
>
> switch (stationItem.getState()) {
> case FaultStationItem.STATE_NORMAL:
> stationItem.setMarker(normalMarker);
> break;
> case FaultStationItem.STATE_FEW_FAULTS:
> stationItem.setMarker(fewFaultsMarker);
> break;
> case FaultStationItem.STATE_MUCH_FAULTS:
> stationItem.setMarker(muchFaultsMarker);
> break;
> default:
> throw new IllegalStateException("stationItem
> should have one of
> the three available states");
> }
>
> faultStations.add(stationItem);
>
> }
>
> setLastFocusedIndex(-1);
>
> populate();
>
> }
>
> @Override
> protected boolean hitTest(FaultStationItem item, Drawable marker, int
> hitX, int hitY) {
>
> //The code written here was deduced from what happens
> in the debugger ;-) .
>
> Rect bounds = marker.getBounds();
>
> int width = bounds.width();
> int height = bounds.height();
> int centerX = bounds.centerX();
> int centerY = bounds.centerY();
>
> int touchWidth = Math.max(MIN_TOUCHABLE_WIDTH, width);
> int touchLeft = centerX - touchWidth / 2;
> int touchHeight = Math.max(MIN_TOUCHABLE_HEIGHT, height);
> int touchTop = centerY - touchHeight / 2;
>
> touchableBounds.set(touchLeft, touchTop, touchLeft +
> touchWidth,
> touchTop + touchHeight);
>
> return touchableBounds.contains(hitX, hitY);
> }
>
> @Override
> protected FaultStationItem createItem(int i) {
> return faultStations.get(i);
> }
>
> @Override
> public int size() {
> return faultStations.size();
> }
>
> }
>
> Regards,
> Piwaï
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