[android-developers] Re: MapView Overlay problem

You could conceivably use a change in zoom level to drive the thinning
of the poly lines, or other factors that help you determine the level
of thinning. This is not trivial - you'll want to run the algorithm
outside of your Overlay.draw() and probably not draw any lines until
the algorithm has finished. Off the cuff, I figure you'll have to use
AsyncTask for that, so there's not quick and dirty way (that I can
see) if you want to get this right. In any case, you could study
MyTracks to find out how they've solved this problem.

On Jul 1, 2:00 am, Felix Garcia Lainez <fgarcialai...@gmail.com>
wrote:
> Hi,
>
> So you are doing something similar to my draw method?
>
> I have just tested without alpha and anti-alising and it is faster,
> but when there is big zoom level the mapactivity is closed (i think
> this is due to memory usage)
>
> How should i profile this case? Really as i said there is not any
> strange thing on the code... Simply a map with an overlay...
>
> Thanks!
>
> On 1 jul, 01:39, TreKing <treking...@gmail.com> wrote:
>
>
>
>
>
>
>
> > On Thu, Jun 30, 2011 at 5:47 PM, Felix Garcia Lainez <
>
> > fgarcialai...@gmail.com> wrote:
> > > About the size with 300 or 400 GeoPoints i am already having problems...
> > > The method isOnePointVisible is an optimization i did in order to try to
> > > improve performance (seems to work fine).
>
> > So I have a very similar overlay to draw routes, with no optimization, and I
> > just loaded 7 or 8 of them with no apparent slow down on my Nexus One.
>
> > Here are some thoughts:
> > - What device are you running on?
> > - Are you debugging or is this in release mode?
> > - Do you need anti-aliasing? I think that might slow it down.
> > - Do you need alpha? That would definitely slow down drawing. Set that to
> > solid and see if if helps.
>
> > If none of that helps you're going to have to profile your code to get a
> > clear picture of what's taking so long.
>
> > --------------------------------------------------------------------------- ----------------------
> > TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago
> > transit tracking app for Android-powered devices

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