这篇文章主要介绍Android如何实现多级树形选择列表，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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项目中有多个地方要用到多级列表的菜单，最开始我用的是ExpandableListView，但问题是ExpandableListView只支持两级列表，于是我就用ExpandableListView嵌套ExpandableListView，但非常麻烦，而且关键的是具体分几级是不确定的，也就是可能一级，可能多级，这要是五六级嵌套ListView，于是我就去学习鸿洋大神之前写的一篇关于实现Android多级树形列表的文章，实现很巧妙，使用一个ListView就可以实现多级列表效果，我做了部分修改，功能顺利实现。
1.定义节点实体类：
package com.xiaoyehai.multileveltreelist.treelist; import java.util.ArrayList; import java.util.List; /** * 节点实体类 * Created by xiaoyehai on 2018/7/11 0011. */ public class Node{ /** * 当前节点id */ private String id; /** * 父节点id */ private String pid; /** * 节点数据实体类 */ private T data; /** * 设置开启 关闭的图片 */ public int iconExpand = -1, iconNoExpand = -1; /** * 节点名称 */ private String name; /** * 当前的级别 */ private int level; /** * 是否展开 */ private boolean isExpand = false; private int icon = -1; /** * 下一级的子Node */ private List children = new ArrayList<>(); /** * 父Node */ private Node parent; /** * 是否被checked选中 */ private boolean isChecked; public Node() { } public Node(String id, String pid, String name) { this.id = id; this.pid = pid; this.name = name; } public Node(String id, String pid, T data, String name) { this.id = id; this.pid = pid; this.data = data; this.name = name; } /** * 是否为根节点 * * @return */ public boolean isRootNode() { return parent == null; } /** * 判断父节点是否展开 * * @return */ public boolean isParentExpand() { if (parent == null) return false; return parent.isExpand(); } /** * 是否是叶子节点 * * @return */ public boolean isLeaf() { return children.size() == 0; } /** * 获取当前的级别level */ public int getLevel() { return parent == null ? 0 : parent.getLevel() + 1; } /** * 设置展开 * * @param isExpand */ public void setExpand(boolean isExpand) { this.isExpand = isExpand; if (!isExpand) { for (Node node : children) { node.setExpand(isExpand); } } } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getPid() { return pid; } public void setPid(String pid) { this.pid = pid; } public T getData() { return data; } public void setData(T data) { this.data = data; } public int getIconExpand() { return iconExpand; } public void setIconExpand(int iconExpand) { this.iconExpand = iconExpand; } public int getIconNoExpand() { return iconNoExpand; } public void setIconNoExpand(int iconNoExpand) { this.iconNoExpand = iconNoExpand; } public String getName() { return name; } public void setName(String name) { this.name = name; } public void setLevel(int level) { this.level = level; } public boolean isExpand() { return isExpand; } public int getIcon() { return icon; } public void setIcon(int icon) { this.icon = icon; } public List getChildren() { return children; } public void setChildren(List children) { this.children = children; } public Node getParent() { return parent; } public void setParent(Node parent) { this.parent = parent; } public boolean isChecked() { return isChecked; } public void setChecked(boolean checked) { isChecked = checked; } }
2.定义每个节点数据的实体类
因为项目中多个地方用到树形菜单，而且数据都不一样，每个节点数据都比较复杂，所以我单独封装出一个类，要是数据和简单，这步可以不用，直接用Node类。
例如：
/**
* 每个节点的具体数据
* Created by xiaoyehai on 2018/7/11 0011.
*/
public class NodeData {
private String name;
public NodeData() {
}
public NodeData(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}3.TreeHelper
package com.xiaoyehai.multileveltreelist.treelist;
import java.util.ArrayList;
import java.util.List;
/**
* Created by xiaoyehai on 2018/7/11 0011.
*/
public class TreeHelper {
/**
* 传入node 返回排序后的Node
* 拿到用户传入的数据，转化为List以及设置Node间关系，然后根节点，从根往下遍历进行排序；
*
* @param datas
* @param defaultExpandLevel 默认显示
* @return
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public static List getSortedNodes(List datas, int defaultExpandLevel) {
List result = new ArrayList();
// 设置Node间父子关系
List nodes = convetData2Node(datas);
// 拿到根节点
List rootNodes = getRootNodes(nodes);
// 排序以及设置Node间关系
for (Node node : rootNodes) {
addNode(result, node, defaultExpandLevel, 1);
}
return result;
}
/**
* 过滤出所有可见的Node
* 过滤Node的代码很简单，遍历所有的Node，只要是根节点或者父节点是展开状态就添加返回
*
* @param nodes
* @return
*/
public static List filterVisibleNode(List nodes) {
List result = new ArrayList();
for (Node node : nodes) {
// 如果为跟节点，或者上层目录为展开状态
if (node.isRootNode() || node.isParentExpand()) {
setNodeIcon(node);
result.add(node);
}
}
return result;
}
/**
* 将我们的数据转化为树的节点
* 设置Node间，父子关系;让每两个节点都比较一次，即可设置其中的关系
*/
private static List convetData2Node(List nodes) {
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 (m.getPid() instanceof String) {
if (m.getPid().equals(n.getId())) { //n时m的父节点
n.getChildren().add(m);
m.setParent(n);
} else if (m.getId().equals(n.getPid())) { //m时n的父节点
m.getChildren().add(n);
n.setParent(m);
}
} else {
if (m.getPid() == n.getId()) {
n.getChildren().add(m);
m.setParent(n);
} else if (m.getId() == n.getPid()) {
m.getChildren().add(n);
n.setParent(m);
}
}
}
}
return nodes;
}
/**
* 获得根节点
*
* @param nodes
* @return
*/
private static List getRootNodes(List nodes) {
List root = new ArrayList();
for (Node node : nodes) {
if (node.isRootNode())
root.add(node);
}
return root;
}
/**
* 把一个节点上的所有的内容都挂上去
* 通过递归的方式，把一个节点上的所有的子节点等都按顺序放入
*/
private static void addNode(List 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.getChildren().size(); i++) {
addNode(nodes, node.getChildren().get(i), defaultExpandLeval, currentLevel + 1);
}
}
/**
* 设置节点的图标
*
* @param node
*/
private static void setNodeIcon(Node node) {
if (node.getChildren().size() > 0 && node.isExpand()) {
node.setIcon(node.iconExpand);
} else if (node.getChildren().size() > 0 && !node.isExpand()) {
node.setIcon(node.iconNoExpand);
} else {
node.setIcon(-1);
}
}
} 4.TreeListViewAdapter
对于ListView的适配器，需要继承自TreeListViewAdapter,如
package com.xiaoyehai.multileveltreelist.treelist;
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.ArrayList;
import java.util.List;
/**
* Created by xiaoyehai on 2018/7/11 0011.
*/
public abstract class TreeListViewAdapter extends BaseAdapter {
protected Context mContext;
/**
* 默认不展开
*/
private int defaultExpandLevel = 0;
/**
* 展开与关闭的图片
*/
private int iconExpand = -1, iconNoExpand = -1;
/**
* 存储所有的Node
*/
protected List mAllNodes = new ArrayList<>();
protected LayoutInflater mInflater;
/**
* 存储所有可见的Node
*/
protected List mNodes = new ArrayList<>();
/**
* 点击的回调接口
*/
private OnTreeNodeClickListener onTreeNodeClickListener;
public void setOnTreeNodeClickListener(OnTreeNodeClickListener onTreeNodeClickListener) {
this.onTreeNodeClickListener = onTreeNodeClickListener;
}
public TreeListViewAdapter(ListView listView, Context context, List datas, int defaultExpandLevel, int iconExpand, int iconNoExpand) {
this.mContext = context;
this.defaultExpandLevel = defaultExpandLevel;
this.iconExpand = iconExpand;
this.iconNoExpand = iconNoExpand;
for (Node node : datas) {
node.getChildren().clear();
node.setIconExpand(iconExpand);
node.setIconNoExpand(iconNoExpand);
}
/**
* 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
*/
listView.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);
}
}
});
}
/**
* @param listView
* @param context
* @param datas
* @param defaultExpandLevel 默认展开几级树
*/
public TreeListViewAdapter(ListView listView, Context context, List datas, int defaultExpandLevel) {
this(listView, context, datas, defaultExpandLevel, -1, -1);
}
/**
* 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());
//获取所有可见的Node
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() * 50, 12, 12, 12);
return convertView;
}
/**
* 获取排序后所有节点
*
* @return
*/
public List getAllNodes() {
if (mAllNodes == null)
mAllNodes = new ArrayList();
return mAllNodes;
}
/**
* 获取所有选中节点
*
* @return
*/
public List getSelectedNode() {
List checks = new ArrayList();
for (int i = 0; i < mAllNodes.size(); i++) {
Node n = mAllNodes.get(i);
if (n.isChecked()) {
checks.add(n);
}
}
return checks;
}
/**
* 设置多选
*
* @param node
* @param checked
*/
protected void setChecked(final Node node, boolean checked) {
node.setChecked(checked);
setChildChecked(node, checked);
if (node.getParent() != null)
setNodeParentChecked(node.getParent(), checked);
notifyDataSetChanged();
}
/**
* 设置是否选中
*
* @param node
* @param checked
*/
public void setChildChecked(Node node, boolean checked) {
if (!node.isLeaf()) {
node.setChecked(checked);
for (Node childrenNode : node.getChildren()) {
setChildChecked(childrenNode, checked);
}
} else {
node.setChecked(checked);
}
}
private void setNodeParentChecked(Node node, boolean checked) {
if (checked) {
node.setChecked(checked);
if (node.getParent() != null)
setNodeParentChecked(node.getParent(), checked);
} else {
List childrens = node.getChildren();
boolean isChecked = false;
for (Node children : childrens) {
if (children.isChecked()) {
isChecked = true;
}
}
//如果所有自节点都没有被选中 父节点也不选中
if (!isChecked) {
node.setChecked(checked);
}
if (node.getParent() != null)
setNodeParentChecked(node.getParent(), checked);
}
}
/**
* 清除掉之前数据并刷新 重新添加
*
* @param mlists
* @param defaultExpandLevel 默认展开几级列表
*/
public void addDataAll(List mlists, int defaultExpandLevel) {
mAllNodes.clear();
addData(-1, mlists, defaultExpandLevel);
}
/**
* 在指定位置添加数据并刷新 可指定刷新后显示层级
*
* @param index
* @param mlists
* @param defaultExpandLevel 默认展开几级列表
*/
public void addData(int index, List mlists, int defaultExpandLevel) {
this.defaultExpandLevel = defaultExpandLevel;
notifyData(index, mlists);
}
/**
* 在指定位置添加数据并刷新
*
* @param index
* @param mlists
*/
public void addData(int index, List mlists) {
notifyData(index, mlists);
}
/**
* 添加数据并刷新
*
* @param mlists
*/
public void addData(List mlists) {
addData(mlists, defaultExpandLevel);
}
/**
* 添加数据并刷新 可指定刷新后显示层级
*
* @param mlists
* @param defaultExpandLevel
*/
public void addData(List mlists, int defaultExpandLevel) {
this.defaultExpandLevel = defaultExpandLevel;
notifyData(-1, mlists);
}
/**
* 添加数据并刷新
*
* @param node
*/
public void addData(Node node) {
addData(node, defaultExpandLevel);
}
/**
* 添加数据并刷新 可指定刷新后显示层级
*
* @param node
* @param defaultExpandLevel
*/
public void addData(Node node, int defaultExpandLevel) {
List nodes = new ArrayList<>();
nodes.add(node);
this.defaultExpandLevel = defaultExpandLevel;
notifyData(-1, nodes);
}
/**
* 刷新数据
*
* @param index
* @param mListNodes
*/
public void notifyData(int index, List mListNodes) {
for (int i = 0; i < mListNodes.size(); i++) {
Node node = mListNodes.get(i);
node.getChildren().clear();
node.iconExpand = iconExpand;
node.iconNoExpand = iconNoExpand;
}
for (int i = 0; i < mAllNodes.size(); i++) {
Node node = mAllNodes.get(i);
node.getChildren().clear();
//node.isNewAdd = false;
}
if (index != -1) {
mAllNodes.addAll(index, mListNodes);
} else {
mAllNodes.addAll(mListNodes);
}
/**
* 对所有的Node进行排序
*/
mAllNodes = TreeHelper.getSortedNodes(mAllNodes, defaultExpandLevel);
/**
* 过滤出可见的Node
*/
mNodes = TreeHelper.filterVisibleNode(mAllNodes);
//刷新数据
notifyDataSetChanged();
}
public abstract View getConvertView(Node node, int position, View convertView, ViewGroup parent);
} 5.接口回调：
选中状态改变的回调：
package com.xiaoyehai.multileveltreelist.treelist;
/**
* Created by xiaoyehai on 2018/7/12 0012.
*/
public interface OnTreeNodeCheckedChangeListener {
void onCheckChange(Node node, int position, boolean isChecked);
}条目点击的回调：
package com.xiaoyehai.multileveltreelist.treelist;
/**
* Created by xiaoyehai on 2018-07-12.
*/
public interface OnTreeNodeClickListener {
void onClick(Node node, int position);
}6.使用：
布局文件：
Activity:
public class ListViewActivity extends AppCompatActivity {
private ListView mListView;
private List dataList = new ArrayList<>();
private ListViewAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
mListView = (ListView) findViewById(R.id.listview);
initData();
//第一个参数 ListView
//第二个参数 上下文
//第三个参数 数据集
//第四个参数 默认展开层级数 0为不展开
//第五个参数 展开的图标
//第六个参数 闭合的图标
mAdapter = new ListViewAdapter(mListView, this, dataList,
0, R.drawable.zoomout_yzs, R.drawable.zoomin_yzs);
mListView.setAdapter(mAdapter);
//获取所有节点
final List allNodes = mAdapter.getAllNodes();
for (Node allNode : allNodes) {
//Log.e("xyh", "onCreate: " + allNode.getName());
}
//选中状态监听
mAdapter.setCheckedChangeListener(new OnTreeNodeCheckedChangeListener() {
@Override
public void onCheckChange(Node node, int position, boolean isChecked) {
//获取所有选中节点
List selectedNode = mAdapter.getSelectedNode();
for (Node n : selectedNode) {
Log.e("xyh", "onCheckChange: " + n.getName());
}
}
});
}
/**
* 模拟数据，实际开发中对返回的json数据进行封装
*/
private void initData() {
//根节点
Node node = new Node<>("0", "-1", "根节点1");
dataList.add(node);
dataList.add(new Node<>("1", "-1", "根节点2"));
dataList.add(new Node<>("2", "-1", "根节点3"));
//根节点1的二级节点
dataList.add(new Node<>("3", "0", "二级节点"));
dataList.add(new Node<>("4", "0", "二级节点"));
dataList.add(new Node<>("5", "0", "二级节点"));
//根节点2的二级节点
dataList.add(new Node<>("6", "1", "二级节点"));
dataList.add(new Node<>("7", "1", "二级节点"));
dataList.add(new Node<>("8", "1", "二级节点"));
//根节点3的二级节点
dataList.add(new Node<>("9", "2", "二级节点"));
dataList.add(new Node<>("10", "2", "二级节点"));
dataList.add(new Node<>("11", "2", "二级节点"));
//三级节点
dataList.add(new Node<>("12", "3", "三级节点"));
dataList.add(new Node<>("13", "3", "三级节点"));
dataList.add(new Node<>("14", "3", "三级节点"));
dataList.add(new Node<>("15", "4", "三级节点"));
dataList.add(new Node<>("16", "4", "三级节点"));
dataList.add(new Node<>("17", "4", "三级节点"));
dataList.add(new Node<>("18", "5", "三级节点"));
dataList.add(new Node<>("19", "5", "三级节点"));
dataList.add(new Node<>("20", "5", "三级节点"));
//四级节点
dataList.add(new Node<>("21", "12", "四级节点"));
//...
//可以有无线多层级
}
} adapter：
package com.xiaoyehai.multileveltreelist.adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import com.xiaoyehai.multileveltreelist.R;
import com.xiaoyehai.multileveltreelist.treelist.OnTreeNodeCheckedChangeListener;
import com.xiaoyehai.multileveltreelist.treelist.TreeListViewAdapter;
import com.xiaoyehai.multileveltreelist.treelist.Node;
import java.util.List;
/**
* Created by xiaoyehai on 2018/7/12 0012.
*/
public class ListViewAdapter extends TreeListViewAdapter {
private OnTreeNodeCheckedChangeListener checkedChangeListener;
public void setCheckedChangeListener(OnTreeNodeCheckedChangeListener checkedChangeListener) {
this.checkedChangeListener = checkedChangeListener;
}
public ListViewAdapter(ListView listView, Context context, List datas, int defaultExpandLevel, int iconExpand, int iconNoExpand) {
super(listView, context, datas, defaultExpandLevel, iconExpand, iconNoExpand);
}
@Override
public View getConvertView(final Node node, final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = View.inflate(mContext, R.layout.item, null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tvName.setText(node.getName());
if (node.getIcon() == -1) {
holder.ivExpand.setVisibility(View.INVISIBLE);
} else {
holder.ivExpand.setVisibility(View.VISIBLE);
holder.ivExpand.setImageResource(node.getIcon());
}
holder.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setChecked(node, holder.checkBox.isChecked());
if (checkedChangeListener != null) {
checkedChangeListener.onCheckChange(node, position,holder.checkBox.isChecked());
}
}
});
if (node.isChecked()) {
holder.checkBox.setChecked(true);
} else {
holder.checkBox.setChecked(false);
}
return convertView;
}
static class ViewHolder {
private CheckBox checkBox;
private TextView tvName;
private ImageView ivExpand;
public ViewHolder(View convertView) {
checkBox = convertView.findViewById(R.id.cb);
tvName = convertView.findViewById(R.id.tv_name);
ivExpand = convertView.findViewById(R.id.iv_expand);
}
}
} 也可以用RecycleView实现，在我的项目里面都有。
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