android PullToRefreshScrollView中 嵌套viewpage 解决不显示的问题

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
         int viewHeight = 0;
    View childView = getChildAt(getCurrentItem());
    if(childView != null)  //有可能没有子view
    {
            childView.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED));
        viewHeight = childView.getMeasuredHeight();   //得到父元素对自身设定的高
        heightMeasureSpec = MeasureSpec.makeMeasureSpec(viewHeight, MeasureSpec.EXACTLY);
    }
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}