public  void animHeightView(final View view, final int start, final int end,                              long duration) {    ValueAnimator animator = ValueAnimator.ofInt(start, end);    final ViewGroup.LayoutParams layoutParams = v.getLayoutParams();    animator .addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {        @Override        public void onAnimationUpdate(ValueAnimator animation) {            layoutParams.height = (int) animation.getAnimatedValue();            view.setLayoutParams(layoutParams);            view.requestLayout();        }    });    animator.setDuration(duration);    animator.start();}

mContentView.postDelayed(new Runnable() {    @Override    public void run() {        ((LinearLayout.LayoutParams) mContentView.getLayoutParams()).weight = 1.0F;        // 刷新布局        mContentView.requestLayout();    }}, 200L);

若没有调用requestLayout()，可能布局不会刷新