That is, invalidate only the rectangle you're going to draw on, Android will take care of preserving what you've already drawn.
On Mon, Feb 16, 2009 at 10:31 PM, Romain Guy <romain...@google.com> wrote: > > You have to handle persistence yourself. To do so, either draw your > dots in a Bitmap or make sure to draw only the dots that will show on > screen. > > On Mon, Feb 16, 2009 at 12:04 PM, Greg <gregory.r.fie...@gmail.com> wrote: >> >> I've been searching around and can't seem to find a way to do this >> properly. I am doing some tracking where I want to draw dots on a >> map overlay recording previous positions. When onDraw of the overlay >> is called it seems the canvas is cleared so I have to redraw all of >> the history on every invocation. This could result in several >> thousands of dots being draw over time which seems to not be very >> efficient. >> >> Is there some flag somewhere that I have not found which tells a map >> overlay to be persistent? Or is there some way I can save and restore >> the canvas so I'm only maintaining/drawing the current point on each >> onDraw? >> >> Thanks, >> >> Greg >> > >> > > > > -- > Romain Guy > Android framework engineer > romain...@android.com > > Note: please don't send private questions to me, as I don't have time > to provide private support. All such questions should be posted on > public forums, where I and others can see and answer them > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
