ScrollView中嵌套ListView时显示不全的解决方案

在ScrollView中嵌套ListView时，ListView只能显示一行多一点.

经过验证，简单有效，在listview.setAdapter()之后调用Utility.setListViewHeightBasedOnChilren(listview)就Okay 了。

public class Utility {
    public static void setListViewHeightBasedOnChildren(ListView listView) {
            //获取ListView对应的Adapter
        ListAdapter listAdapter = listView.getAdapter(); 
        if (listAdapter == null) {
            // pre-condition
            return;
        }

        int totalHeight = 0;
        for (int i = 0, len = listAdapter.getCount(); i < len; i++) {   //listAdapter.getCount()返回数据项的数目
            View listItem = listAdapter.getView(i, null, listView);
            listItem.measure(0, 0);  //计算子项View 的宽高
            totalHeight += listItem.getMeasuredHeight();  //统计所有子项的总高度
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        //listView.getDividerHeight()获取子项间分隔符占用的高度
        //params.height最后得到整个ListView完整显示需要的高度
        listView.setLayoutParams(params);
    }

}