Hi list,
I am trying to cache my viewgroup to a bitmap and blit this to screen
instead of calling dispatchDraw on the group while scrolling for
performance reasons. This works quite well on 1.5, but has ugly
scaling artefacts on 1.6 and newer for high density screens. Because
of my 1.5 compatibility I can't find a way to set the density of my
cached bitmap.
Here is the relevant code from my ViewGroup subclass:
@Override
public void dispatchDraw (Canvas canvas) {
if (active) { // Draw the real viewgroup if we aren't scrolling
super.dispatchDraw(canvas);
} else { // otherwise create a cached copy if necessary and
draw
this
if (idleView == null) { // create canvas and bitmap if
not done
already
idleView = Bitmap.createBitmap(getWidth(),
getHeight(),
Bitmap.Config.ARGB_8888);
idleCanvas = new Canvas(idleView);
idleViewValid = false;
}
if (!idleViewValid) { // Draw onto the canvas
super.dispatchDraw(idleCanvas);
idleViewValid = true;
}
// Then render this bitmap to screen
canvas.drawBitmap(idleView, matrix, paint);
}
}
I tried the same with getDrawingCache and had the same problem :(
I'd be glad for any help.
Best regards,
Kevin
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