getView中返回的View必须是LinearLayout布局

    public static void setListViewHeightBasedOnChildren(ListView listView){
        NewsAdapter newsAdapter = (NewsAdapter) listView.getAdapter();
        if (newsAdapter==null){
            return;
        }
        int totalHeight=0;
        // newsAdapter.getCount() 获取返回数据项的数目
        for (int i=0;newsAdapter.getCount()>i;i++){
            View listItem = newsAdapter.getView(i,null,listView);
            // 计算子项View的宽高
            listItem.measure(0,0);
            // 统计所有子项的总高度
            totalHeight+=listItem.getMeasuredHeight();
        }
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight+(listView.getDividerHeight()*(newsAdapter.getCount()-1));
        //getDividerHeight()：获取子项间分隔符占用的高度， params.height 得到整个ListView 完整显示需要的高度
        listView.setLayoutParams(params);
    }

最后调用在设配器之后