Android多级列表ExpandableListView使用实例

      转载请注明出处：http://blog.csdn.net/coder_jone/article/details/39158601 

     为了方便识别和区分，人类习惯将各具特征的事物分为不同的类别。这在很多的手机应用中也得到了体现，如联系人分组、商品分类等等。Android提供了多级列表控件

ExpandableListView来满足开发的需求，接下来我们通过一个具体的实例来看看ExpandableListView的简单使用方法。

首先我们还是来编写一个用于显示的界面，界面布局文件很简单，只包含了一个简单的多级列表控件：

接下来看一下界面代码，在界面中主要是为多级列表设置适配器以及相应处理列表点击事件：

package com.jone.example.expandablelistdemo;

import com.jone.example.expandablelistdemo.MyExpandableListViewAdapter.OnChildItemClickListener;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ExpandableListView;
import android.widget.Toast;
import android.widget.ExpandableListView.OnGroupExpandListener;

/**
 * 多级列表测试界面
 * 
 * @author Jone
 */
public class MainActivity extends Activity implements OnGroupExpandListener, OnChildItemClickListener
{
	private ExpandableListView mExpandableListView;

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		mExpandableListView = (ExpandableListView) findViewById(R.id.activity_main_expandablelistview);
		mExpandableListView.setDivider(null);
		mExpandableListView.setOnGroupExpandListener(this);

		MyExpandableListViewAdapter adapter = new MyExpandableListViewAdapter(this);
		mExpandableListView.setAdapter(adapter);
		adapter.setOnChildItemClickListener(this);
	}

	@Override
	public void onGroupExpand(int groupPosition)
	{
		for (int i = 0, count = mExpandableListView.getExpandableListAdapter().getGroupCount(); i < count; i++)
		{
			if (groupPosition != i)
			{
				// 关闭其他分组
				mExpandableListView.collapseGroup(i);
			}
		}
	}

	@Override
	public void onChildItemClicked(int groupPosition, int childPosition)
	{
		Toast.makeText(this, "点击了" + groupPosition + "下的" + childPosition, Toast.LENGTH_SHORT).show();
	}
}

针对多级列表控件ExpandableListView Android提供了对应的多级列表适配器类BaseExpandableListAdapter，我们需要编写一个继承自BaseExpandableListAdapter的子类，因为是多级列表这里需要定义两个布局文件，一个用于一级列表另一个用于子列表，接下来我们首先看看一级列表的布局文件代码：

子列表布局如下：

写完布局文件以后，我们开始编写适配器代码：

package com.jone.example.expandablelistdemo;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

/**
 * 多级列表适配器
 * 
 * @author Jone
 */
public class MyExpandableListViewAdapter extends BaseExpandableListAdapter
{
	private String[] mGroupTypes = new String[] { "好友", "陌生人", "黑名单" };
	private String[][] mGroupMembers = new String[][] { { "好友一", "好友二", "好友三", "好友四", "好友五" }, { "陌生人一", "陌生人二", "陌生人三", "陌生人四", "陌生人五", "陌生人六" },
			{ "黑名单一", "黑名单二", "黑名单三", "黑名四" } };
	private LayoutInflater mLayoutInflater;
	private OnChildItemClickListener mOnChildItemClickListener;

	public MyExpandableListViewAdapter(Context context)
	{
		mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	@Override
	public int getGroupCount()
	{
		return mGroupTypes.length;
	}

	@Override
	public Object getGroup(int groupPosition)
	{
		return mGroupTypes[groupPosition];
	}

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

	@Override
	public int getChildrenCount(int groupPosition)
	{
		return mGroupMembers[groupPosition].length;
	}

	@Override
	public Object getChild(int groupPosition, int childPosition)
	{
		return mGroupMembers[groupPosition][childPosition];
	}

	@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)
	{
		GroupViewHolder groupViewHolder;
		if (convertView == null)
		{
			groupViewHolder = new GroupViewHolder();
			convertView = mLayoutInflater.inflate(R.layout.groupitem, null);
			groupViewHolder.mGroupInfo = (TextView) convertView.findViewById(R.id.expandablelistview_groupitem_info);
			groupViewHolder.mGroupIcon = (ImageView) convertView.findViewById(R.id.expandablelistview_groupitem_icon);
			convertView.setTag(groupViewHolder);
		}
		else
		{
			groupViewHolder = (GroupViewHolder) convertView.getTag();
		}

		if (isExpanded)
			groupViewHolder.mGroupIcon.setImageResource(R.drawable.ic_uparrows);
		else
			groupViewHolder.mGroupIcon.setImageResource(R.drawable.ic_downarrows);
		groupViewHolder.mGroupInfo.setText(mGroupTypes[groupPosition]);
		return convertView;
	}

	private final class GroupViewHolder
	{
		TextView mGroupInfo;
		ImageView mGroupIcon;
	}

	@Override
	public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
	{
		ChildViewHolder viewHolder;
		if (convertView == null)
		{
			viewHolder = new ChildViewHolder();
			convertView = mLayoutInflater.inflate(R.layout.childitem, null);
			viewHolder.mChildInfoItem = (RelativeLayout) convertView.findViewById(R.id.paylist_item);
			viewHolder.mChildItemInfo = (TextView) convertView.findViewById(R.id.paylist_item_goldtv);
			convertView.setTag(viewHolder);
		}
		else
		{
			viewHolder = (ChildViewHolder) convertView.getTag();
		}

		viewHolder.mChildItemInfo.setText(mGroupMembers[groupPosition][childPosition]);
		viewHolder.mChildInfoItem.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View view)
			{
				mOnChildItemClickListener.onChildItemClicked(groupPosition, childPosition);
			}
		});
		return convertView;
	}

	private final class ChildViewHolder
	{
		RelativeLayout mChildInfoItem;
		TextView mChildItemInfo;
	}

	@Override
	public boolean isChildSelectable(int groupPosition, int childPosition)
	{
		return true;
	}

	public interface OnChildItemClickListener
	{
		public void onChildItemClicked(int groupPosition, int childPosition);
	}

	public void setOnChildItemClickListener(OnChildItemClickListener onChildItemClickListener)
	{
		mOnChildItemClickListener = onChildItemClickListener;
	}
}

主要代码编写完成，下面来看看运行效果吧！

源码地址：http://download.csdn.net/detail/coder_jone/7885521