TreeListViewAdapter.java

package com.mcxtzhang.learnannotationdemo.expand.helper;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListView;

import java.util.List;

public abstract class TreeListViewAdapter<T> extends BaseAdapter
{  
  
    protected Context mContext;
    /** 
     * 存储所有可见的Node 
     */  
    protected List<Node> mNodes;
    protected LayoutInflater mInflater;
    /** 
     * 存储所有的Node 
     */  
    protected List<Node> mAllNodes;  
  
    /** 
     * 点击的回调接口 
     */  
    private OnTreeNodeClickListener onTreeNodeClickListener;  
  
    public interface OnTreeNodeClickListener  
    {  
        void onClick(Node node, int position);  
    }  
  
    public void setOnTreeNodeClickListener(  
            OnTreeNodeClickListener onTreeNodeClickListener)  
    {  
        this.onTreeNodeClickListener = onTreeNodeClickListener;  
    }  
  
    /** 
     *  
     * @param mTree 
     * @param context 
     * @param datas 
     * @param defaultExpandLevel 
     *            默认展开几级树 
     * @throws IllegalArgumentException 
     * @throws IllegalAccessException 
     */  
    public TreeListViewAdapter(ListView mTree, Context context, List<T> datas,
                               int defaultExpandLevel) throws IllegalArgumentException,
            IllegalAccessException  
    {  
        mContext = context;  
        /** 
         * 对所有的Node进行排序 
         */  
        mAllNodes = TreeHelper.getSortedNodes(datas, defaultExpandLevel);  
        /** 
         * 过滤出可见的Node 
         */  
        mNodes = TreeHelper.filterVisibleNode(mAllNodes);  
        mInflater = LayoutInflater.from(context);  
  
        /** 
         * 设置节点点击时，可以展开以及关闭；并且将ItemClick事件继续往外公布 
         */  
        mTree.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {  
            @Override  
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id)
            {  
                expandOrCollapse(position);  
  
                if (onTreeNodeClickListener != null)  
                {  
                    onTreeNodeClickListener.onClick(mNodes.get(position),  
                            position);  
                }  
            }  
  
        });  
  
    }  
  
    /** 
     * 相应ListView的点击事件 展开或关闭某节点 
     *  
     * @param position 
     */  
    public void expandOrCollapse(int position)  
    {  
        Node n = mNodes.get(position);  
  
        if (n != null)// 排除传入参数错误异常  
        {  
            if (!n.isLeaf())  
            {  
                n.setExpand(!n.isExpand());  
                mNodes = TreeHelper.filterVisibleNode(mAllNodes);  
                notifyDataSetChanged();// 刷新视图  
            }  
        }  
    }  
  
    @Override  
    public int getCount()  
    {  
        return mNodes.size();  
    }  
  
    @Override  
    public Object getItem(int position)  
    {  
        return mNodes.get(position);  
    }  
  
    @Override  
    public long getItemId(int position)  
    {  
        return position;  
    }  
  
    @Override  
    public View getView(int position, View convertView, ViewGroup parent)
    {  
        Node node = mNodes.get(position);  
        convertView = getConvertView(node, position, convertView, parent);  
        // 设置内边距  
        convertView.setPadding(node.getLevel() * 30, 3, 3, 3);  
        return convertView;  
    }  
  
    public abstract View getConvertView(Node node, int position,  
            View convertView, ViewGroup parent);  
  
}