Android--ExpandbleView源码学习一---ExpandableListView使用

首先需要在layout下的某个xml文件中申明ExpandableView节点

<ExpandableListView android:id="@+id/ExpandableListView_Section"
		android:layout_width="fill_parent" android:layout_height="wrap_content"
		android:clickable="false" android:divider="#FFCECFCE"
		android:dividerHeight="1.0dp" android:fadingEdge="vertical"
		android:background="#FFFFFFFF" android:childDivider="#FFCECFCE"
		android:cacheColorHint="#00000000">
	</ExpandableListView>

然后在代码中取到该view

expLV = (ExpandableListView) mLayout.findViewById(R.id.ExpandableListView_Section);

然后设置他的adapter

expLV.setAdapter(adapter);

这样就可以了。

adapter是一个继承BaseExpandableListAdapter的类。需要实现如下方法

/**扩展baseExpandableAdapter用于展示二级列表使用*/
    public class MyExpandableListAdapter extends BaseExpandableListAdapter{
        private LayoutInflater mInflater;
        private List<KnowledgeCatalogInfo> KnowledgeCatalogInfos;
        
        public MyExpandableListAdapter(Context context , List<KnowledgeCatalogInfo> KnowledgeCatalogInfos){
            this.mInflater = LayoutInflater.from(context);
            this.KnowledgeCatalogInfos = KnowledgeCatalogInfos;
        }
        
        public MyExpandableListAdapter(Context context){
            this.mInflater = LayoutInflater.from(context);
        }
        
        
        @Override
        public int getGroupCount() {
        }

        @Override
        public int getChildrenCount(int groupPosition) {
        }

        @Override
        public Object getGroup(int groupPosition) {
            return this.KnowledgeCatalogInfos.get(groupPosition);
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return null;
        }

        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {          
            return childPosition;
        }

        @Override
        public boolean hasStableIds() {
            return true;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
            return view;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            return view;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }
        /**
         * 获得展示的VIEW
         * @return
        */ 
        public View getGenericView(){
            View view = this.mInflater.inflate(R.layout.practise_section_group_item_layout, null);
            return view;
        }
    }