I am trying to understand which this code which works perfectly for
capturing almost any view except if there is a ScrollView in the
framelayout, in this case there is a slight issue with the top and
bottom areas where scrollview fades its contents. There is some
corruption occurring.
public class FrameLayoutWithOfflineBitmap extends FrameLayout {
private Bitmap mOfflineBitmap;
private Canvas mOfflineCanvas;
public FrameLayoutWithOfflineBitmap(Context context) {
super(context);
}
@Override
public void onSizeChanged(int w, int h, int oldw, int oldh) {
// just in case we already had the bitmap allocated before
if(mOfflineBitmap != null) {
mOfflineBitmap.recycle();
}
mOfflineBitmap = Bitmap.createBitmap(w, h,
Bitmap.Config.RGB_565);
mOfflineCanvas = new Canvas();
mOfflineCanvas.setBitmap(mOfflineBitmap);
}
@Override
public void dispatchDraw(Canvas canvas) {
// draw to our offline bitmap
super.dispatchDraw(mOfflineCanvas);
// now draw our offline bitmap to the system canvas
canvas.drawBitmap(mOfflineBitmap, 0, 0, null);
}
public Bitmap getScreenSnapshot() {
return mOfflineBitmap;
}
}
I understand there are other ways to capture the view such as using
the View's drawing cache, but I am not interested in this method. Can
someone explain to me what is going on here and if there is way to
address this issue? Basically I am trying to get access to a snapshot
of a view as quick as possible. My idea is that the view is already
drawn onto the screen, we should be able to get access to this without
having to force another redundant redraw of the view.
I am also very keen to understand the flaw with the above code in
terms of the scrollview. Thanks.
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