performance - Android drawing to bitmap canvas slow -

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scenario have imageview fills phone screen. every based on touch events draw offscreen bitmap , display on imageview.

code display is

bitmap b = bitmap.createbitmap(globals.screenwidth,globals.screenheight, bitmap.config.argb_8888); canvas canvas = new canvas(b);

then bunch of paint settings, drawrects, , font outputs.

once bitmap/canvas updated show onscreen calling

imageview iv = (imageview)findviewbyid(r.id.mainview); iv.setimagebitmap(b);

this works slow. there not lot of drawrects , font updates (maybe @ 100 drawrects , 5 or 6 lines of text), can take 400 ms draw. when should seem instant user when touch screen.

any other ways of getting offscreen bitmap and/or canvas display fast onscreen?


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