I am working on an Android app that already exists on iPhone.
In the app, there is a Map activity that has (I counted) around 800
markers in four groups marked by drawable in four different colors.
Each group can be turned on or off. Information about markers I have
inside List. I create a mapOverlay for each group, then I attach that
overlay to the map. I strongly believe that coding part I did
properly. But I will attach my code anyway...
The thing is, my Nexus One can't handle map with all those markers. It
takes around 15 seconds just to draw 500 markers. Then when all drawn,
map is not quite smooth. It is sort of hard to zoom and navigate
around. It can be done, but experience is bad and I would like to see
if something can be done there. I know if I avoid String > Double
conversion, I could save some time, but I doubt that would be
significant.
iPhone seems doesn't have problems showing all these markers. It takes
roughly about 1-2 seconds to show all of them and zooming and panning
is not that bad. Slow down is noticeable but still acceptable. I
personally think it is no good to draw all those markers, but app is
designed by somebody else and I am not supposed to make any drastic
changes.
I am not sure what to do here. It seems I will have to come up with
different functionality, maybe use GPS location, if known, and draw
only markers within some radius, or, if location not known, use center
of the screen(map) and draw markers around that. I will have to have
reasonable explanation for my bosses in case I make these changes.
I appreciate if anybody has any idas.
And the code:
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable =
this.getResources().getDrawable(R.drawable.pin_blue);
drawable = this.getResources().getDrawable(R.drawable.pin_blue);
ArrList = appState.GetSleepArrList();
ItemizedOverlay itemizedoverlay = new ItemizedOverlay(drawable,
this);
...
...
for (int m = 0; m < ArrList.size(); m++) {
tName = ArrList.get(m).get("name").toString();
tId = ArrList.get(m).get("id").toString();
tLat = ArrList.get(m).get("lat").toString();;
tLng = ArrList.get(m).get("lng").toString();;
try {
lat = Double.parseDouble(tLat);
lng = Double.parseDouble(tLng);
p1 = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
OverlayItem overlayitem = new OverlayItem(p1,
tName, tId);
itemizedoverlay.addOverlay(overlayitem);
} catch (NumberFormatException e) {
Log.d(TAG, "NumberFormatException" + e);
}
}
mapOverlays.add(itemizedoverlay);
mapView.postInvalidate();
................................
public class ItemizedOverlay extends ItemizedOverlay<OverlayItem>
{
private ArrayList<OverlayItem> mOverlays = new
ArrayList<OverlayItem>();
private Context mContext;
public HelloItemizedOverlay(Drawable defaultMarker, Context
context)
{
super(boundCenterBottom(defaultMarker));
mContext = context;
}
public void addOverlay(OverlayItem overlay)
{
mOverlays.add(overlay);
populate();
}
@Override
protected OverlayItem createItem(int i)
{
return mOverlays.get(i);
}
@Override
public int size()
{
return mOverlays.size();
}
@Override
protected boolean onTap(int index)
{
final OverlayItem item = mOverlays.get(index);
... EACH MARKER WILL HAVE ONCLICK EVENT THAT
WILL PRODUCE CLICABLE
... BALOON WITH MARKER'S NAME.
return true;
}
}
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