https://stackoverflow.com/questions/4946295/android-expand-collapse-animation
On Thu, Jun 19, 2014 at 11:07 AM, Sheng-Dean <[email protected]> wrote: > 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. > > -- > 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 > --- > You received this message because you are subscribed to the Google Groups > "Android Developers" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- *Παύλος-Πέτρος Τουρνάρης (Pavlos-Petros Tournaris)* *Android Developer & Software Engineer* http://about.me/pavlospt -- 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 --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
