ScrollView嵌套下ListView或ExpandableListView的高度自适应

发现问题

最近因为项目需要使用ScrollView来嵌套ListView和ExpandableListView，在开发过程中发现，显示的时候ListView不能完全正确的显示，一种做法就是使ListView高度自适应。

ScrollView嵌套ListView

/*
* 动态设置ListView高度
* @param listView 
* @param adapter listView 的适配器
* */
public void setListHeight(ListView listView, Adapter adapter) {

if (adapter == null) {
return;
    }

int totalHeight = 0;

/* adapter.getCount()返回数据项的数目*/  
for (int i = 0; i < adapter.getCount(); i++) {

        View itemView = adapter.getView(i, null, listView);
// 计算子项View 的宽高 
        itemView.measure(View.MeasureSpec.UNSPECIFIED , View.MeasureSpec.UNSPECIFIED);
// 统计所有子项的总高度
        totalHeight += itemView.getMeasuredHeight();    
    }

/* 
 * 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 
 * */ 
    ViewGroup.LayoutParams params = listView.getLayoutParams();

params.height = totalHeight + (listView.getDividerHeight() * (adapter.getCount() - 1));

    listView.setLayoutParams(params);
}

ScrollView嵌套ExpandableListView

ExpandableListView呈现的效果类似QQ的好友分组

// ExpandListView 列表状态 1展开 0关闭 该案例中设置为三级
int[] isExpand = new int[] { 0, 0, 0 };

// 通过监听展开和关闭事件动态设置高度
listView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
        isExpand[groupPosition] = 1;
        setListHeight(listView, listAdapter);
    }
});

listView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
        isExpand[groupPosition] = 0;
        setListHeight(listView, listAdapter);
    }
});

/*
* ExpandListView自适应高度 根据子项数量
* @param listView 
* @param listAdapter listView 的适配器
* */
public void setListHeight(ExpandableListView listView, Adapter listAdapter) {

if (listAdapter == null) {
return;
        }

int totalHeight = 0;
int total = 0;

        View listItem;

for (int i = 0; i < listAdapter.getGroupCount(); i++) {
            listItem = listAdapter.getGroupView(i, false, null, listView);
            listItem.measure(0, 0);
            totalHeight += listItem.getMeasuredHeight();
            total += (listAdapter.getChildrenCount(0) - 1);
        }

for(int i = 0; i < isExpand.lenght ; i++) {

if (isExpand[i] == 1)

for (int j = 0; j < listAdapter.getChildrenCount(i); j++) {
                listItem = listAdapter.getChildView(i, j, false, null, listView);
                listItem.measure(0, 0);
                totalHeight += listItem.getMeasuredHeight();
                total += (listAdapter.getChildrenCount(i) - 1);
            }
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();

params.height = totalHeight + (listView.getDividerHeight() * total);

        listView.setLayoutParams(params);
}

作者：黄伟杰
原文链接：ScrollView嵌套下ListView或ExpandableListView的高度自适应