android多级树形列表

2016年11月16日 5点热度 0条评论 来源: 再见孙悟空_

我们开发app过程中,经常会碰到需要 多级列表展示的效果。而android原生sdk中根本没有3级 4级甚至更多级别的列表控件。

所以我们就要自己去实现一个类似treeListView 的控件,下面这个是我项目中的一个效果图,可支持多级列表扩展。

           

android中有ExpandListView控件,但是这个控件只支持两级列表。对于多级列表如果重写这个不是很好用。

实现这种列表 思想就是递归,构造一个子父级的关系。

话不多说 代码中体会

Activity

package com.example.customtreeviewdemo;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import com.example.customtreeviewdemo.bean.MyNodeBean;
import com.example.customtreeviewdemo.tree.Node;
import com.example.customtreeviewdemo.tree.TreeListViewAdapter.OnTreeNodeClickListener;

public class MainActivity extends Activity {

	private ListView treeLv;
	private Button checkSwitchBtn;
	private MyTreeListViewAdapter<MyNodeBean> adapter;
	private List<MyNodeBean> mDatas = new ArrayList<MyNodeBean>();
	//标记是显示Checkbox还是隐藏
	private boolean isHide = true;

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

		initDatas();
		treeLv = (ListView) this.findViewById(R.id.tree_lv);
		checkSwitchBtn = (Button)this.findViewById(R.id.check_switch_btn);
		
		checkSwitchBtn.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				if(isHide){
					isHide = false;
				}else{
					isHide = true;
				}
				
				adapter.updateView(isHide);
			}
			
		});
		try {
			adapter = new MyTreeListViewAdapter<MyNodeBean>(treeLv, this,
					mDatas, 10, isHide);

			adapter.setOnTreeNodeClickListener(new OnTreeNodeClickListener() {
				@Override
				public void onClick(Node node, int position) {
					if (node.isLeaf()) {
						Toast.makeText(getApplicationContext(), node.getName(),
								Toast.LENGTH_SHORT).show();
					}
				}

				@Override
				public void onCheckChange(Node node, int position,
						List<Node> checkedNodes) {

					StringBuffer sb = new StringBuffer();
					for (Node n : checkedNodes) {
						int pos = n.getId() - 1;
						sb.append(mDatas.get(pos).getName()).append("---")
								.append(pos + 1).append(";");

					}

					Toast.makeText(getApplicationContext(), sb.toString(),
							Toast.LENGTH_SHORT).show();
				}

			});
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
		treeLv.setAdapter(adapter);

	}

	private void initDatas() {
		mDatas.add(new MyNodeBean(1, 0, "中国古代"));
		mDatas.add(new MyNodeBean(2, 1, "唐朝"));
		mDatas.add(new MyNodeBean(3, 1, "宋朝"));
		mDatas.add(new MyNodeBean(4, 1, "明朝"));
		mDatas.add(new MyNodeBean(5, 2, "李世民"));
		mDatas.add(new MyNodeBean(6, 2, "李白"));

		mDatas.add(new MyNodeBean(7, 3, "赵匡胤"));
		mDatas.add(new MyNodeBean(8, 3, "苏轼"));

		mDatas.add(new MyNodeBean(9, 4, "朱元璋"));
		mDatas.add(new MyNodeBean(10, 4, "唐伯虎"));
		mDatas.add(new MyNodeBean(11, 4, "文征明"));
		mDatas.add(new MyNodeBean(12, 7, "赵建立"));
		mDatas.add(new MyNodeBean(13, 8, "苏东东"));
		mDatas.add(new MyNodeBean(14, 10, "秋香"));
	}
}

Adapter

这个adapter是继承了自己的定义的一个TreeListViewAdapter,核心实现都是在TreeListViewAdapter这个里面

package com.example.customtreeviewdemo;

import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.example.customtreeviewdemo.tree.Node;
import com.example.customtreeviewdemo.tree.TreeListViewAdapter;

public class MyTreeListViewAdapter<T> extends TreeListViewAdapter<T> {

	public MyTreeListViewAdapter(ListView mTree, Context context,
			List<T> datas, int defaultExpandLevel,boolean isHide)
			throws IllegalArgumentException, IllegalAccessException {
		super(mTree, context, datas, defaultExpandLevel,isHide);
	}
	
	@SuppressWarnings("unchecked")
	@Override
	public View getConvertView(Node node, int position, View convertView,
			ViewGroup parent) {
		ViewHolder viewHolder = null;
		if (convertView == null)
		{
			convertView = mInflater.inflate(R.layout.list_item, parent, false);
			viewHolder = new ViewHolder();
			viewHolder.icon = (ImageView) convertView
					.findViewById(R.id.id_treenode_icon);
			viewHolder.label = (TextView) convertView
					.findViewById(R.id.id_treenode_name);
			viewHolder.checkBox = (CheckBox)convertView.findViewById(R.id.id_treeNode_check);
			
			convertView.setTag(viewHolder);

		} else
		{
			viewHolder = (ViewHolder) convertView.getTag();
		}

		if (node.getIcon() == -1)
		{
			viewHolder.icon.setVisibility(View.INVISIBLE);
		} else
		{
			viewHolder.icon.setVisibility(View.VISIBLE);
			viewHolder.icon.setImageResource(node.getIcon());
		}

		if(node.isHideChecked()){
			viewHolder.checkBox.setVisibility(View.GONE);
		}else{
			viewHolder.checkBox.setVisibility(View.VISIBLE);
			setCheckBoxBg(viewHolder.checkBox,node.isChecked());
		}
		viewHolder.label.setText(node.getName());
		
		
		return convertView;
	}
	private final class ViewHolder
	{
		ImageView icon;
		TextView label;
		CheckBox checkBox;
	}
	
	/**
	 * checkbox是否显示
	 * @param cb
	 * @param isChecked
	 */
	private void setCheckBoxBg(CheckBox cb,boolean isChecked){
		if(isChecked){
			cb.setBackgroundResource(R.drawable.check_box_bg_check);
		}else{
			cb.setBackgroundResource(R.drawable.check_box_bg);
		}
	}
}

自定义TreeListViewAdapter  这个是整个树形结构的一个适配器,这里面主要是实现对Node节点的操作 点击,选中改变 更新等

package com.example.customtreeviewdemo.tree;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ListView;
import android.widget.RelativeLayout;

/**
 * tree适配器
 * @param <T>
 */
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 {
		/**
		 * 处理node click事件
		 * @param node
		 * @param position
		 */
		void onClick(Node node, int position);
		/**
		 * 处理checkbox选择改变事件
		 * @param node
		 * @param position
		 * @param checkedNodes
		 */
		void onCheckChange(Node node, int position,List<Node> checkedNodes);
	}

	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, boolean isHide)
			throws IllegalArgumentException, IllegalAccessException {
		mContext = context;
		/**
		 * 对所有的Node进行排序
		 */
		mAllNodes = TreeHelper
				.getSortedNodes(datas, defaultExpandLevel, isHide);
		/**
		 * 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 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(final int position, View convertView, ViewGroup parent) {
		final Node node = mNodes.get(position);

		convertView = getConvertView(node, position, convertView, parent);
		// 设置内边距
		convertView.setPadding(node.getLevel() * 30, 3, 3, 3);
		if (!node.isHideChecked()) {
			//获取各个节点所在的父布局
			RelativeLayout myView = (RelativeLayout) convertView;
			//父布局下的CheckBox
			CheckBox cb = (CheckBox) myView.getChildAt(1);
			cb.setOnCheckedChangeListener(new OnCheckedChangeListener(){

				@Override
				public void onCheckedChanged(CompoundButton buttonView,
						boolean isChecked) {
					TreeHelper.setNodeChecked(node, isChecked);
					List<Node> checkedNodes = new ArrayList<Node>();
					for(Node n:mAllNodes){
						if(n.isChecked()){
							checkedNodes.add(n);
						}
					}
					
					onTreeNodeClickListener.onCheckChange(node,position,checkedNodes);
					TreeListViewAdapter.this.notifyDataSetChanged();
				}
				
			});
		}

		return convertView;
	}

	public abstract View getConvertView(Node node, int position,
			View convertView, ViewGroup parent);

	/**
	 * 更新
	 * @param isHide
	 */
	public void updateView(boolean isHide){
		for(Node node:mAllNodes){
			node.setHideChecked(isHide);
		}
		
		this.notifyDataSetChanged();
	}

}

node 模型类

package com.example.customtreeviewdemo.bean;

public class MyNodeBean {
	/**
	 * 节点Id
	 */
	private int id;
	/**
	 * 节点父id
	 */
	private int pId;
	/**
	 * 节点name
	 */
	private String name;
	/**
	 * 
	 */
	private String desc;
	/**
	 * 节点名字长度
	 */
	private long length;
	
	
	public MyNodeBean(int id, int pId, String name) {
		super();
		this.id = id;
		this.pId = pId;
		this.name = name;
	}
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public int getPid() {
		return pId;
	}
	public void setPid(int pId) {
		this.pId = pId;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDesc() {
		return desc;
	}
	public void setDesc(String desc) {
		this.desc = desc;
	}
	public long getLength() {
		return length;
	}
	public void setLength(long length) {
		this.length = length;
	}
	
	
}

TreeHelper这个也是核心操作类,主要功能是将业务数据和节点数据进行匹配

package com.example.customtreeviewdemo.tree;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import com.example.customtreeviewdemo.R;

public class TreeHelper {

	/**
	 * 根据所有节点获取可见节点
	 * 
	 * @param allNodes
	 * @return
	 */
	public static List<Node> filterVisibleNode(List<Node> allNodes) {
		List<Node> visibleNodes = new ArrayList<Node>();
		for (Node node : allNodes) {
			// 如果为根节点,或者上层目录为展开状态
			if (node.isRoot() || node.isParentExpand()) {
				setNodeIcon(node);
				visibleNodes.add(node);
			}
		}
		return visibleNodes;
	}

	/**
	 * 获取排序的所有节点
	 * 
	 * @param datas
	 * @param defaultExpandLevel
	 * @return
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public static <T> List<Node> getSortedNodes(List<T> datas,
			int defaultExpandLevel, boolean isHide)
			throws IllegalAccessException, IllegalArgumentException {
		List<Node> sortedNodes = new ArrayList<Node>();
		// 将用户数据转化为List<Node>
		List<Node> nodes = convertData2Nodes(datas, isHide);
		// 拿到根节点
		List<Node> rootNodes = getRootNodes(nodes);
		// 排序以及设置Node间关系
		for (Node node : rootNodes) {
			addNode(sortedNodes, node, defaultExpandLevel, 1);
		}
		return sortedNodes;
	}

	/**
	 * 把一个节点上的所有的内容都挂上去
	 */
	private static void addNode(List<Node> nodes, Node node,
			int defaultExpandLeval, int currentLevel) {

		nodes.add(node);
		if (defaultExpandLeval >= currentLevel) {
			node.setExpand(true);
		}

		if (node.isLeaf())
			return;
		for (int i = 0; i < node.getChildrenNodes().size(); i++) {
			addNode(nodes, node.getChildrenNodes().get(i), defaultExpandLeval,
					currentLevel + 1);
		}
	}

	/**
	 * 获取所有的根节点
	 * 
	 * @param nodes
	 * @return
	 */
	public static List<Node> getRootNodes(List<Node> nodes) {
		List<Node> rootNodes = new ArrayList<Node>();
		for (Node node : nodes) {
			if (node.isRoot()) {
				rootNodes.add(node);
			}
		}

		return rootNodes;
	}

	/**
	 * 将泛型datas转换为node
	 * 
	 * @param datas
	 * @return
	 * @throws IllegalArgumentException
	 * @throws IllegalAccessException
	 */
	public static <T> List<Node> convertData2Nodes(List<T> datas, boolean isHide)
			throws IllegalAccessException, IllegalArgumentException {
		List<Node> nodes = new ArrayList<Node>();
		Node node = null;

		for (T t : datas) {
			int id = -1;
			int pId = -1;
			String name = null;

			Class<? extends Object> clazz = t.getClass();
			Field[] declaredFields = clazz.getDeclaredFields();
			/**
			 * 与MyNodeBean实体一一对应
			 */
			for (Field f : declaredFields) {
				if ("id".equals(f.getName())) {
					f.setAccessible(true);
					id = f.getInt(t);
				}

				if ("pId".equals(f.getName())) {
					f.setAccessible(true);
					pId = f.getInt(t);
				}

				if ("name".equals(f.getName())) {
					f.setAccessible(true);
					name = (String) f.get(t);
				}

				if ("desc".equals(f.getName())) {
					continue;
				}

				if ("length".equals(f.getName())) {
					continue;
				}

				if (id == -1 && pId == -1 && name == null) {
					break;
				}
			}

			node = new Node(id, pId, name);
			node.setHideChecked(isHide);
			nodes.add(node);
		}

		/**
		 * 比较nodes中的所有节点,分别添加children和parent
		 */
		for (int i = 0; i < nodes.size(); i++) {
			Node n = nodes.get(i);
			for (int j = i + 1; j < nodes.size(); j++) {
				Node m = nodes.get(j);
				if (n.getId() == m.getpId()) {
					n.getChildrenNodes().add(m);
					m.setParent(n);
				} else if (n.getpId() == m.getId()) {
					n.setParent(m);
					m.getChildrenNodes().add(n);
				}
			}
		}

		for (Node n : nodes) {
			setNodeIcon(n);
		}
		return nodes;
	}

	/**
	 * 设置打开,关闭icon
	 * 
	 * @param node
	 */
	public static void setNodeIcon(Node node) {
		if (node.getChildrenNodes().size() > 0 && node.isExpand()) {
			node.setIcon(R.drawable.tree_expand);
		} else if (node.getChildrenNodes().size() > 0 && !node.isExpand()) {
			node.setIcon(R.drawable.tree_econpand);
		} else
			node.setIcon(-1);
	}

	public static void setNodeChecked(Node node, boolean isChecked) {
		// 自己设置是否选择
		node.setChecked(isChecked);
		/**
		 * 非叶子节点,子节点处理
		 */
		setChildrenNodeChecked(node, isChecked);
		/** 父节点处理 */
		setParentNodeChecked(node);
	}

	/**
	 * 非叶子节点,子节点处理
	 */
	private static void setChildrenNodeChecked(Node node, boolean isChecked) {
		node.setChecked(isChecked);
		if (!node.isLeaf()) {
			for (Node n : node.getChildrenNodes()) {
				// 所有子节点设置是否选择
				setChildrenNodeChecked(n, isChecked);
			}
		}
	}

	/**
	 * 设置父节点选择
	 * 
	 * @param node
	 */
	private static void setParentNodeChecked(Node node) {

		/** 非根节点 */
		if (!node.isRoot()) {
			Node rootNode = node.getParent();
			boolean isAllChecked = true;
			for (Node n : rootNode.getChildrenNodes()) {
				if (!n.isChecked()) {
					isAllChecked = false;
					break;
				}
			}

			if (isAllChecked) {
				rootNode.setChecked(true);
			} else {
				rootNode.setChecked(false);
			}
			setParentNodeChecked(rootNode);
		}
	}

}

核心的代码就是这些,希望对大家有帮助。

DEMO源码

大家如果有其它问题,可以加入我的qq群:Android开发经验交流群 454430053  互相讨论交流。

    原文作者:再见孙悟空_
    原文地址: https://blog.csdn.net/shaoyezhangliwei/article/details/52275130
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