Android實現多級樹形選擇列表

這篇文章主要爲大家詳細介紹了Android實現多級樹形選擇列表，具有一定的參考價值，感興趣的小夥伴們可以參考一下

項目中有多個地方要用到多級列表的菜單，最開始我用的是ExpandableListView，但問題是ExpandableListView只支持兩級列表，於是我就用ExpandableListView嵌套ExpandableListView，但非常麻煩，而且關鍵的是具體分幾級是不確定的，也就是可能一級，可能多級，這要是五六級嵌套ListView，於是我就去學習鴻洋大神之前寫的一篇關於實現Android多級樹形列表的文章，實現很巧妙，使用一個ListView就可以實現多級列表效果，我做了部分修改，功能順利實現。

1.定義節點實體類：

package com.xiaoyehai.multileveltreelist.treelist;

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

/**
 * 節點實體類
 * Created by xiaoyehai on 2018/7/11 0011.
 */

public class Node<T> {
 /**
 * 當前節點id
 */
 private String id;

 /**
 * 父節點id
 */
 private String pid;

 /**
 * 節點數據實體類
 */
 private T data;

 /**
 * 設置開啓 關閉的圖片
 */
 public int iconExpand = -1, iconNoExpand = -1;

 /**
 * 節點名稱
 */
 private String name;

 /**
 * 當前的級別
 */
 private int level;

 /**
 * 是否展開
 */
 private boolean isExpand = false;

 private int icon = -1;

 /**
 * 下一級的子Node
 */
 private List<Node> children = new ArrayList<>();

 /**
 * 父Node
 */
 private Node parent;

 /**
 * 是否被checked選中
 */
 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;
 }

 /**
 * 是否爲根節點
 *
 * @return
 */
 public boolean isRootNode() {
 return parent == null;
 }

 /**
 * 判斷父節點是否展開
 *
 * @return
 */
 public boolean isParentExpand() {
 if (parent == null)
  return false;
 return parent.isExpand();
 }

 /**
 * 是否是葉子節點
 *
 * @return
 */
 public boolean isLeaf() {
 return children.size() == 0;
 }

 /**
 * 獲取當前的級別level
 */
 public int getLevel() {
 return parent == null ? 0 : parent.getLevel() + 1;
 }

 /**
 * 設置展開
 *
 * @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<Node> getChildren() {
 return children;
 }

 public void setChildren(List<Node> 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.定義每個節點數據的實體類

因爲項目中多個地方用到樹形菜單，而且數據都不一樣，每個節點數據都比較複雜，所以我單獨封裝出一個類，要是數據和簡單，這步可以不用，直接用Node類。

例如：

/**
 * 每個節點的具體數據
 * 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 {
 /**
 * 傳入node 返回排序後的Node
 * 拿到用戶傳入的數據，轉化爲List<Node>以及設置Node間關係，然後根節點，從根往下遍歷進行排序；
 *
 * @param datas
 * @param defaultExpandLevel 默認顯示
 * @return
 * @throws IllegalArgumentException
 * @throws IllegalAccessException
 */
 public static List<Node> getSortedNodes(List<Node> datas, int defaultExpandLevel) {
 List<Node> result = new ArrayList<Node>();
 // 設置Node間父子關係
 List<Node> nodes = convetData2Node(datas);
 // 拿到根節點
 List<Node> rootNodes = getRootNodes(nodes);
 // 排序以及設置Node間關係
 for (Node node : rootNodes) {
  addNode(result, node, defaultExpandLevel, 1);
 }
 return result;
 }

 /**
 * 過濾出所有可見的Node
 * 過濾Node的代碼很簡單，遍歷所有的Node，只要是根節點或者父節點是展開狀態就添加返回
 *
 * @param nodes
 * @return
 */
 public static List<Node> filterVisibleNode(List<Node> nodes) {
 List<Node> result = new ArrayList<Node>();

 for (Node node : nodes) {
  // 如果爲跟節點，或者上層目錄爲展開狀態
  if (node.isRootNode() || node.isParentExpand()) {
  setNodeIcon(node);
  result.add(node);
  }
 }
 return result;
 }

 /**
 * 將我們的數據轉化爲樹的節點
 * 設置Node間，父子關係;讓每兩個節點都比較一次，即可設置其中的關係
 */
 private static List<Node> convetData2Node(List<Node> 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時m的父節點
   n.getChildren().add(m);
   m.setParent(n);
   } else if (m.getId().equals(n.getPid())) { //m時n的父節點
   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;
 }

 /**
 * 獲得根節點
 *
 * @param nodes
 * @return
 */
 private static List<Node> getRootNodes(List<Node> nodes) {
 List<Node> root = new ArrayList<Node>();
 for (Node node : nodes) {
  if (node.isRootNode())
  root.add(node);
 }
 return root;
 }

 /**
 * 把一個節點上的所有的內容都掛上去
 * 通過遞歸的方式，把一個節點上的所有的子節點等都按順序放入
 */
 private static <T> void addNode(List<Node> nodes, Node<T> 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);
 }
 }

 /**
 * 設置節點的圖標
 *
 * @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

對於ListView的適配器，需要繼承自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;

 /**
 * 默認不展開
 */
 private int defaultExpandLevel = 0;

 /**
 * 展開與關閉的圖片
 */
 private int iconExpand = -1, iconNoExpand = -1;

 /**
 * 存儲所有的Node
 */
 protected List<Node> mAllNodes = new ArrayList<>();

 protected LayoutInflater mInflater;

 /**
 * 存儲所有可見的Node
 */
 protected List<Node> mNodes = new ArrayList<>();

 /**
 * 點擊的回調接口
 */
 private OnTreeNodeClickListener onTreeNodeClickListener;

 public void setOnTreeNodeClickListener(OnTreeNodeClickListener onTreeNodeClickListener) {
 this.onTreeNodeClickListener = onTreeNodeClickListener;
 }

 public TreeListViewAdapter(ListView listView, Context context, List<Node> 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);
 }

 /**
  * 對所有的Node進行排序
  */
 mAllNodes = TreeHelper.getSortedNodes(datas, defaultExpandLevel);

 /**
  * 過濾出可見的Node
  */
 mNodes = TreeHelper.filterVisibleNode(mAllNodes);

 mInflater = LayoutInflater.from(context);

 /**
  * 設置節點點擊時，可以展開以及關閉；並且將ItemClick事件繼續往外公佈
  */
 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 默認展開幾級樹
 */
 public TreeListViewAdapter(ListView listView, Context context, List<Node> datas, int defaultExpandLevel) {
 this(listView, context, datas, defaultExpandLevel, -1, -1);
 }

 /**
 * 相應ListView的點擊事件 展開或關閉某節點
 *
 * @param position
 */
 public void expandOrCollapse(int position) {
 Node n = mNodes.get(position);

 if (n != null) {// 排除傳入參數錯誤異常
  if (!n.isLeaf()) {
  n.setExpand(!n.isExpand());
  //獲取所有可見的Node
  mNodes = TreeHelper.filterVisibleNode(mAllNodes);
  notifyDataSetChanged();// 刷新視圖
  }
 }
 }

 @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);
 // 設置內邊距
 convertView.setPadding(node.getLevel() * 50, 12, 12, 12);
 return convertView;
 }

 /**
 * 獲取排序後所有節點
 *
 * @return
 */
 public List<Node> getAllNodes() {
 if (mAllNodes == null)
  mAllNodes = new ArrayList<Node>();
 return mAllNodes;
 }

 /**
 * 獲取所有選中節點
 *
 * @return
 */
 public List<Node> getSelectedNode() {
 List<Node> checks = new ArrayList<Node>();
 for (int i = 0; i < mAllNodes.size(); i++) {
  Node n = mAllNodes.get(i);
  if (n.isChecked()) {
  checks.add(n);
  }
 }
 return checks;
 }


 /**
 * 設置多選
 *
 * @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();
 }

 /**
 * 設置是否選中
 *
 * @param node
 * @param checked
 */
 public <T> void setChildChecked(Node<T> 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<Node> childrens = node.getChildren();
  boolean isChecked = false;
  for (Node children : childrens) {
  if (children.isChecked()) {
   isChecked = true;
  }
  }
  //如果所有自節點都沒有被選中 父節點也不選中
  if (!isChecked) {
  node.setChecked(checked);
  }
  if (node.getParent() != null)
  setNodeParentChecked(node.getParent(), checked);
 }
 }

 /**
 * 清除掉之前數據並刷新 重新添加
 *
 * @param mlists
 * @param defaultExpandLevel 默認展開幾級列表
 */
 public void addDataAll(List<Node> mlists, int defaultExpandLevel) {
 mAllNodes.clear();
 addData(-1, mlists, defaultExpandLevel);
 }

 /**
 * 在指定位置添加數據並刷新 可指定刷新後顯示層級
 *
 * @param index
 * @param mlists
 * @param defaultExpandLevel 默認展開幾級列表
 */
 public void addData(int index, List<Node> mlists, int defaultExpandLevel) {
 this.defaultExpandLevel = defaultExpandLevel;
 notifyData(index, mlists);
 }

 /**
 * 在指定位置添加數據並刷新
 *
 * @param index
 * @param mlists
 */
 public void addData(int index, List<Node> mlists) {
 notifyData(index, mlists);
 }

 /**
 * 添加數據並刷新
 *
 * @param mlists
 */
 public void addData(List<Node> mlists) {
 addData(mlists, defaultExpandLevel);
 }

 /**
 * 添加數據並刷新 可指定刷新後顯示層級
 *
 * @param mlists
 * @param defaultExpandLevel
 */
 public void addData(List<Node> mlists, int defaultExpandLevel) {
 this.defaultExpandLevel = defaultExpandLevel;
 notifyData(-1, mlists);
 }

 /**
 * 添加數據並刷新
 *
 * @param node
 */
 public void addData(Node node) {
 addData(node, defaultExpandLevel);
 }

 /**
 * 添加數據並刷新 可指定刷新後顯示層級
 *
 * @param node
 * @param defaultExpandLevel
 */
 public void addData(Node node, int defaultExpandLevel) {
 List<Node> nodes = new ArrayList<>();
 nodes.add(node);
 this.defaultExpandLevel = defaultExpandLevel;
 notifyData(-1, nodes);
 }

 /**
 * 刷新數據
 *
 * @param index
 * @param mListNodes
 */
 public void notifyData(int index, List<Node> 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);
 }
 /**
  * 對所有的Node進行排序
  */
 mAllNodes = TreeHelper.getSortedNodes(mAllNodes, defaultExpandLevel);
 /**
  * 過濾出可見的Node
  */
 mNodes = TreeHelper.filterVisibleNode(mAllNodes);
 //刷新數據
 notifyDataSetChanged();
 }


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

5.接口回調：

選中狀態改變的回調：

package com.xiaoyehai.multileveltreelist.treelist;

/**
 * Created by xiaoyehai on 2018/7/12 0012.
 */

public interface OnTreeNodeCheckedChangeListener {

 void onCheckChange(Node node, int position, boolean isChecked);
}

條目點擊的回調：

package com.xiaoyehai.multileveltreelist.treelist;

/**
 * Created by xiaoyehai on 2018-07-12.
 */
public interface OnTreeNodeClickListener {
 void onClick(Node node, int position);
}

6.使用：

佈局文件：

<ListView
 android:id="@+id/listview"
 android:layout_width="match_parent"
 android:layout_height="match_parent"></ListView>

Activity:

public class ListViewActivity extends AppCompatActivity {

 private ListView mListView;

 private List<Node> 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();

 //第一個參數 ListView
 //第二個參數 上下文
 //第三個參數 數據集
 //第四個參數 默認展開層級數 0爲不展開
 //第五個參數 展開的圖標
 //第六個參數 閉合的圖標
 mAdapter = new ListViewAdapter(mListView, this, dataList,
  0, R.drawable.zoomout_yzs, R.drawable.zoomin_yzs);

 mListView.setAdapter(mAdapter);

 //獲取所有節點
 final List<Node> allNodes = mAdapter.getAllNodes();
 for (Node allNode : allNodes) {
  //Log.e("xyh", "onCreate: " + allNode.getName());
 }

 //選中狀態監聽
 mAdapter.setCheckedChangeListener(new OnTreeNodeCheckedChangeListener() {
  @Override
  public void onCheckChange(Node node, int position, boolean isChecked) {
  //獲取所有選中節點
  List<Node> selectedNode = mAdapter.getSelectedNode();
  for (Node n : selectedNode) {
   Log.e("xyh", "onCheckChange: " + n.getName());
  }
  }
 });
 }

 /**
 * 模擬數據，實際開發中對返回的json數據進行封裝
 */
 private void initData() {
 //根節點
 Node<NodeData> node = new Node<>("0", "-1", "根節點1");
 dataList.add(node);
 dataList.add(new Node<>("1", "-1", "根節點2"));
 dataList.add(new Node<>("2", "-1", "根節點3"));

 //根節點1的二級節點
 dataList.add(new Node<>("3", "0", "二級節點"));
 dataList.add(new Node<>("4", "0", "二級節點"));
 dataList.add(new Node<>("5", "0", "二級節點"));

 //根節點2的二級節點
 dataList.add(new Node<>("6", "1", "二級節點"));
 dataList.add(new Node<>("7", "1", "二級節點"));
 dataList.add(new Node<>("8", "1", "二級節點"));

 //根節點3的二級節點
 dataList.add(new Node<>("9", "2", "二級節點"));
 dataList.add(new Node<>("10", "2", "二級節點"));
 dataList.add(new Node<>("11", "2", "二級節點"));

 //三級節點
 dataList.add(new Node<>("12", "3", "三級節點"));
 dataList.add(new Node<>("13", "3", "三級節點"));
 dataList.add(new Node<>("14", "3", "三級節點"));

 dataList.add(new Node<>("15", "4", "三級節點"));
 dataList.add(new Node<>("16", "4", "三級節點"));
 dataList.add(new Node<>("17", "4", "三級節點"));

 dataList.add(new Node<>("18", "5", "三級節點"));
 dataList.add(new Node<>("19", "5", "三級節點"));
 dataList.add(new Node<>("20", "5", "三級節點"));

 //四級節點
 dataList.add(new Node<>("21", "12", "四級節點"));

 //...
 //可以有無線多層級
 }
}

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<Node> 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實現，在我的項目裏面都有。

[項目地址]：MultilevelTreeList

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持神馬文庫。

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