animation - Android onDraw loop -

i've set global variables x,y in activity class.

i start thread "t0" continually update globals x , y.

i have ondraw pseudocode follows (all on ui thread):-

view.ondraw(){     if (x,y changed value) {         x0=x;         y0=y;         loop (x0-- until x0==0){             canvas.drawbitmap(bmp, x0, y0, bitmappaint);             invalidate();         }     } } 

i hoping i'd see animation of bitmap moving across screen on x-axis, each invalidate() re-drawing new position. instead see 'jump' last x position 0 (no intermediate stages).

i'm making assumption although x , y updating via t0, i'm not concerned since loop busy original x,y values (assigned x0,y0).

i observe x,y updating , code executed inside 'if loop' (i see via debug).

i tried adding delay, didn't seem make difference. can re-draw directly new x,y position, need smooth 'transition' via loop happen one-x0-coord another.

any hints or tips appreciated.

thanks in advance.

steve

i think can't cause ondraw within ondraw. calling invalidate() causes ondraw called after current ondraw finishes. not sure how implemented since it's pseudocode imagine don't want loop in ondraw somethinglike this:

view.ondraw(){     if (x,y changed value) {         x0=x;         y0=y;         if (x0!=0){             x0--;             canvas.drawbitmap(bmp, x0, y0, bitmappaint);             invalidate();         }     } }