Android多级目录树

本例中目录树的菜单数据是从json数据中获取,首先建立一个菜单实体类  MenuTree

package com.gao.tree;

/**
 * 菜单树的各级菜单实体类
 * 
 * @author tjs
 * 
 */
public class MenuTree {
    /** 菜单编号 */
    private String id;
    /** 菜单内容 */
    private String text;
    /** 父节点id */
    private String parentId;
    /** 是否有子节点 */
    private boolean hasChild;
    /** 层级 */
    private int level;
    /** 是否展开 */
    private boolean expanded;

    /***
     * 
     * @param id
     *            菜单编号
     * @param text
     *            菜单显示内容
     * @param hasParent
     *            是否有父节点
     * @param parentId
     *            父节点id
     * @param hasChild
     *            是否有子节点
     * @param level
     *            层级
     * @param expanded
     *            展开状态
     */
    public MenuTree(String id, String text, String parentId, boolean hasChild, int level, boolean expanded) {
        super();
        this.id = id;
        this.text = text;
        this.parentId = parentId;
        this.hasChild = hasChild;
        this.level = level;
        this.expanded = expanded;
    }

    /***
     * 
     * @param id
     *            菜单编号
     * @param text
     *            菜单显示内容
     * @param hasParent
     *            是否有父节点
     * @param parentId
     *            父节点id
     * @param hasChild
     *            是否有子节点
     * @param level
     *            层级
     */
    public MenuTree(String id, String text, String parentId, boolean hasChild, int level) {
        super();
        this.id = id;
        this.text = text;
        this.parentId = parentId;
        this.hasChild = hasChild;
        this.level = level;
        this.expanded = false;// 初始化为折叠
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public String getParentId() {
        return parentId;
    }

    public void setParentId(String parentId) {
        this.parentId = parentId;
    }

    public boolean isHasChild() {
        return hasChild;
    }

    public void setHasChild(boolean hasChild) {
        this.hasChild = hasChild;
    }

    public int getLevel() {
        return level;
    }

    public void setLevel(int level) {
        this.level = level;
    }

    public boolean isExpanded() {
        return expanded;
    }

    public void setExpanded(boolean expanded) {
        this.expanded = expanded;
    }

    @Override
    public String toString() {
        return "MenuTree [id=" + id + ", text=" + text + ", parentId=" + parentId + ", hasChild=" + hasChild + ", level=" + level
                + ", expanded=" + expanded + "]";
    }

}

获取并解析json目录树数据  ,建立工具类  GetDada

package com.gao.tree;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class GetData {
    /**
     * 描述:连接网络,获取Json的byte数组
     * */
    public static byte[] readParse(String urlPath) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] data = new byte[1024];
        int len = 0;
        URL url = new URL(urlPath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        InputStream inStream = conn.getInputStream();
        while ((len = inStream.read(data)) != -1) {
            outStream.write(data, 0, len);
        }
        inStream.close();
        return outStream.toByteArray();
    }

    /**
     * 描述:获得模块列表,解析出层级目录
     * */
    public static List<MenuTree> getAllFolders() {
        List<MenuTree> list = new ArrayList<MenuTree>();
        try {
            byte[] data = readParse("http://192.168.0.205:8080/Jack_wiki/menu!searchAllFolders.action");
            String str = new String(data);

            System.out.println("str = " + str);

            JSONArray jsonArray = new JSONArray(str);
            list = parseJsonArray("", 0, jsonArray);

        } catch (JSONException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

    public static List<MenuTree> parseJsonArray(String parentId, int level, JSONArray jsonArray) throws JSONException {
        List<MenuTree> list = new ArrayList<MenuTree>();
        for (int j = 0; j < jsonArray.length(); j++) {

            JSONObject item = jsonArray.getJSONObject(j);
            String id = item.optString("id");
            String text = item.optString("text");
            JSONArray children = item.getJSONArray("children");
            if (children != null && children.length() > 0) {
                MenuTree tree = new MenuTree(id, text, parentId, true, level);
                List<MenuTree> childList = parseJsonArray(id, level + 1, children);
                list.add(tree);
                list.addAll(childList);
            } else {
                MenuTree tree = new MenuTree(id, text, parentId, false, level);
                list.add(tree);
            }
        }
        return list;
    }

}

显示目录树

package com.gao.tree;

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

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

public class TreeView extends ListActivity {
    private TreeViewAdapter treeViewAdapter = null;
    /** 当前所显示的目录列表 */
    private List<MenuTree> menuTreeShowList = new ArrayList<MenuTree>();
    /** 所有的目录列表 */
    private List<MenuTree> menutreeList = new ArrayList<MenuTree>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        menutreeList = (ArrayList<MenuTree>) GetData.getAllFolders();

        for (MenuTree tree : menutreeList) {
            // 添加最顶层目录
            if (tree.getParentId() == null || "".equals(tree.getParentId())) {
                menuTreeShowList.add(tree);
            }
        }

        treeViewAdapter = new TreeViewAdapter(this, R.layout.outline, menuTreeShowList);
        setListAdapter(treeViewAdapter);
        registerForContextMenu(getListView());
    }

    private class TreeViewAdapter extends ArrayAdapter {
        private LayoutInflater mInflater;
        private List<MenuTree> mfilelist;

        public TreeViewAdapter(Context context, int textViewResourceId, List list) {
            super(context, textViewResourceId, list);
            mInflater = LayoutInflater.from(context);
            mfilelist = list;
        }

        public int getCount() {
            return mfilelist.size();
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            TextView text;
            ImageView icon;
            RelativeLayout rl_menu;
            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.outline, null);
            }
            text = (TextView) convertView.findViewById(R.id.text);
            icon = (ImageView) convertView.findViewById(R.id.icon);
            rl_menu = (RelativeLayout) convertView.findViewById(R.id.rl_menu);

            MenuTree mt = mfilelist.get(position);
            int level = mt.getLevel();

            rl_menu.setPadding(25 * level + 15, icon.getPaddingTop(), 0, icon.getPaddingBottom());
            text.setText(mt.getText());
            if (mt.isHasChild()) {
                if (mt.isExpanded()) {
                    icon.setImageResource(R.drawable.outline_list_expand);
                } else {
                    icon.setImageResource(R.drawable.outline_list_collapse);
                }
            } else if (!mt.isHasChild()) {
                icon.setImageResource(R.drawable.no_child);
            }
            return convertView;
        }
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        if (!menutreeList.get(position).isHasChild()) {// 没有子节点
            Toast.makeText(this, menutreeList.get(position).getText(), Toast.LENGTH_LONG).show();
            return;
        } else if (menuTreeShowList.get(position).isExpanded()) {// 展开状态,点击关闭
            menuTreeShowList.get(position).setExpanded(false);
            MenuTree tree = menuTreeShowList.get(position);

            List<MenuTree> temp = new ArrayList<MenuTree>();

            for (int i = position + 1; i < menuTreeShowList.size(); i++) {
                if (tree.getLevel() >= menuTreeShowList.get(i).getLevel()) {
                    break;
                }
                temp.add(menuTreeShowList.get(i));
            }

            menuTreeShowList.removeAll(temp);

            treeViewAdapter.notifyDataSetChanged();
        } else {// 关闭状态,点击打开
            menuTreeShowList.get(position).setExpanded(true);

            int j = 1;
            for (MenuTree mt : menutreeList) {
                if (mt.getParentId().equals(menuTreeShowList.get(position).getId())) {
                    menuTreeShowList.add(position + j, mt);
                    j++;
                }
            }
            treeViewAdapter.notifyDataSetChanged();
        }
    }
}

布局文件  ouyline.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rl_menu"
    android:layout_width="wrap_content"
    android:layout_height="40dp"
    android:gravity="center_vertical"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/icon"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_centerVertical="true"
        android:scaleType="centerInside"
        android:background="@android:color/transparent"
        android:src="@drawable/outline_list_collapse" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:layout_toRightOf="@id/icon"
        android:gravity="center_vertical"
        android:layout_marginLeft="5dp"
        android:singleLine="true"
        android:text="text"
        android:textSize="20sp"
        android:textColor="#ffffff" />

</RelativeLayout>

最终显示结果,在该实例中,目录树的层级数是可以任意添加的

 

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原文地址：https://www.cnblogs.com/arnoid/p/3192729.html