I have some strange behaviour when repainting the screen with my live
wallpaper. I'm scaling an image and drawing it to the screen, but on each
draw (as the image is scaled smaller than the previous draw), I can still
see the previous image below the new image.
How do I clear the previous image out so that only the new scaled image is
displayed?
This is my code:
private final Runnable mDraw = new Runnable() {
public void run() {
draw();
}
};
void draw() {
SurfaceHolder holder = getSurfaceHolder();
Canvas canvas = null;
try {
canvas = holder.lockCanvas();
if(canvas != null) {
this.paintScreen(canvas);
}
}finally {
if(canvas != null) {
holder.unlockCanvasAndPost(canvas);
}
}
mHandler.removeCallbacks(mDraw);
if (mVisible) {
mHandler.postDelayed(mDraw, 60000);
}
}
Every minute my paintSurface function scales a bitmap (image loaded from
resources), then uses canvas.drawBitmap to put the image on the screen. As
I understand from the documentation, holde.lockCanvas()is not supposed to
contain the image currently on the screen and every pixel has to be
drawn... this doesn't seem to be the case since the previous pixels are
obviously under the new pixels.
Thanks,
J
(26 Sept '12 - 10:45 AM)
--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
