Hello,
I would like to animate the height of a View to make it look like it is
expanding.
My current implementation involves a custom Animation class that invokes
getLayoutParams() and changes the height variable in the
applyTransformation() method. It looks like this:
@Override
protected void applyTransformation(float interpolatedTime,
Transformation t) {
super.applyTransformation(interpolatedTime, t);
LayoutParams layout = mActor.getLayoutParams();
int newHeight = fromHeight + (int) ((toHeight-fromHeight) *
interpolatedTime);
layout.height = newHeight;
mActor.requestLayout();
}
However, animations are choppy because whenever I invoke requestLayout(),
it layouts the entire view hierarchy, which is expensive, resulting in
choppy animations (eg 10fps). I have tried forceLayout(), hoping that it
would only layout a portion of the view hierarchy, however it seems to do
nothing...
Please give me some advice on how I can implement this sort of animations
correctly.
Thank you.
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