动画改变view高度

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