android view的width或者height变化的动画

public static void expand(final View v) {    v.measure(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);    final int targtetHeight = v.getMeasuredHeight();    v.getLayoutParams().height = 0;    v.setVisibility(View.VISIBLE);    Animation a = new Animation()    {        @Override        protected void applyTransformation(float interpolatedTime, Transformation t) {            v.getLayoutParams().height = interpolatedTime == 1                    ? LayoutParams.WRAP_CONTENT                    : (int)(targtetHeight * interpolatedTime);            v.requestLayout();        }        @Override        public boolean willChangeBounds() {            return true;        }    };    // 1dp/ms    a.setDuration((int)(targtetHeight / v.getContext().getResources().getDisplayMetrics().density));    v.startAnimation(a);}public static void collapse(final View v) {    final int initialHeight = v.getMeasuredHeight();    Animation a = new Animation()    {        @Override        protected void applyTransformation(float interpolatedTime, Transformation t) {            if(interpolatedTime == 1){                v.setVisibility(View.GONE);            }else{                v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime);                v.requestLayout();            }        }        @Override        public boolean willChangeBounds() {            return true;        }    };    // 1dp/ms    a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density));    v.startAnimation(a);}
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