I have a map in my android application that shows many markers (~20-50). But the app performs very poor when i try to scroll/zoom (in Google Android Maps i did a sample search f
I've done the following now and it works fast(er):
createMarkers(){
for(elem:bigList){
GeoPoint geoPoint = new GeoPoint((int)(elem.getLat()*1000000), (int) (elem.getLon()*1000000));
OverlayItem overlayItem = new OverlayItem(geoPoint, elem.getName(), elem.getData());
itemizedOverlay.addOverlay(overlayItem);
}
itemizedOverlay.populateNow();
mapOverlays.add(itemizedOverlay); //outside of for loop
}
and in MyOverlay:
public void addOverlay(OverlayItem overlay) {
m_overlays.add(overlay);
}
public void populateNow(){
populate();
}
is this better/correct now ? or any other improvements possible?
If I understand how this works correctly, you should not be calling populate after every add an overlay. You should do it once you've added them all. I think what's happening is that you add the first OverlayItem
and call populate()
so it adds that to the ItemizedOverlay.
Then you add a second OverlayItem
to the list and call populate()
and it adds those two overlays to the ItemizedOverlay
resulting in three items in the overlay. So I think you're getting way more than the 20-50 that you think.
I ran into the same problem last night, and my solution was the same as yours. I felt weird about how I called the populate method.
I had the same code as you but I called
speedyPopulate() {
populate();
}
in the MyOverlay class