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