android ListView 實現3級節點 （可拓展N級）

android ListView 實現3級節點 （可拓展N級）

ListView實現二級節點想必大家都知道可以用ExpandableListView 就可以輕鬆實現，但是要實現3級甚至多級菜單怎麼實現呢？ 再利用ExpandableListView 就會十分繁瑣，今天我們來探究另一種實現方式來實現。

思路：每次點擊展開子功能表 ，可以理解為 listView的一次重繪（資料更新<增加子節點資料>），而收合子功能表就是移除當前節點下的子資料，這是資料更新。對於介面每一個itemView的實現可以在adapter裡面實現，根據沒個子項目的層級，是否含有子節點，是否已經展開來配置不同的介面顯示效果。首先來看實現的效果：

 

1：首先看子項目bean

 

package com.example.androidexpandablelistview;import java.util.ArrayList;import java.util.List;/** * 元素 可根據需要添加新的屬性  * @author jrh * */public class TreeElement {/** * 各個元素的層級標識 */private int parentLevel;/** * 節點顯示標題 */private String noteName;/** * 子節點元素集合 */private ArrayList dataList = new ArrayList();/** * 是否已擴充 */private boolean isExpandAble;/** * 是否有子節點元素 */private boolean isHasChild;/** * 當前節點位置 */private int position;/** *  * @param parentLevel 各個元素的層級標識 * @param noteName 節點顯示標題 * @param dataList 子節點元素集合 * @param isExpandAble 是否已擴充 * @param isHasChild 是否有子節點元素 * @param position 當前節點位置 */public TreeElement(int parentLevel, String noteName,ArrayList dataList, boolean isExpandAble,boolean isHasChild, int position) {super();this.parentLevel = parentLevel;this.noteName = noteName;this.dataList = dataList;this.isExpandAble = isExpandAble;this.isHasChild = isHasChild;this.position = position;}public int getPosition() {return position;}public void setPosition(int position) {this.position = position;}public boolean isHasChild() {return isHasChild;}public void setHasChild(boolean isHasChild) {this.isHasChild = isHasChild;}public int getParentLevel() {return parentLevel;}public void setParentLevel(int parentLevel) {this.parentLevel = parentLevel;}public String getNoteName() {return noteName;}public void setNoteName(String noteName) {this.noteName = noteName;}public ArrayList getDataList() {return dataList;}public void setDataList(ArrayList dataList) {this.dataList = dataList;}public boolean isExpandAble() {return isExpandAble;}public void setExpandAble(boolean isExpandAble) {this.isExpandAble = isExpandAble;}}

2：資料更新adapter

 

 

 

package com.example.androidexpandablelistview;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;/** * 處理點擊 資料更新 通用 * @author jrh * */public class TreeAdapter extends BaseAdapter {private List mParentList;private Context context;public TreeAdapter(List parentList, Context context) {super();this.mParentList = parentList;this.context = context;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn mParentList == null ? 0 : mParentList.size();}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubreturn mParentList == null ? null : mParentList.get(arg0);}@Overridepublic long getItemId(int arg0) {// TODO Auto-generated method stubreturn arg0;}@Overridepublic View getView(int arg0, View arg1, ViewGroup arg2) {// TODO Auto-generated method stubreturn null;}public void onExpandClick(int position) {// 父節點沒有子項目直接返回if (!mParentList.get(position).isHasChild()) {return;}// 父節點已經擴充if (mParentList.get(position).isExpandAble()) {mParentList.get(position).setExpandAble(false);TreeElement element = mParentList.get(position);// 遍曆已擴充的元素，刪除ArrayList temp = new ArrayList();// 從當前點的下一個元素開始隱藏for (int i = position + 1; i < mParentList.size(); i++) {if (element.getParentLevel() >= mParentList.get(i).getParentLevel()) {break;}temp.add(mParentList.get(i));}mParentList.removeAll(temp);for (int i = position + 1; i < mParentList.size(); i++) {mParentList.get(i).setPosition(i);}notifyDataSetChanged();} else {// 父節點為點開TreeElement objElement = mParentList.get(position);objElement.setExpandAble(true);int level = objElement.getParentLevel();int nextLevel = level + 1;ArrayList tempList = objElement.getDataList();//擴充父類集合for (int i = 0; i < tempList.size(); i++) {TreeElement element = tempList.get(i);element.setParentLevel(nextLevel);element.setExpandAble(false);mParentList.add(position+1,element);}for (int i = position+1; i 3：具體適配adapter
 
 
 
package com.example.androidexpandablelistview;import java.util.List;import android.content.Context;import android.graphics.Color;import android.graphics.drawable.LayerDrawable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;/** * 具體子adapter 可根據不同的要求自訂 * @author jrh * */public class DetaiTreeAdapter extends TreeAdapter {private LayoutInflater inflater;private List mParentList;public DetaiTreeAdapter(List parentList, Context context) {super(parentList, context);inflater = LayoutInflater.from(context);mParentList = parentList;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn super.getCount();}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubreturn super.getItem(arg0);}@Overridepublic long getItemId(int arg0) {// TODO Auto-generated method stubreturn super.getItemId(arg0);}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stub// hodler 需為局部變數ViewHodler hodler = new ViewHodler();TreeElement treeElement = mParentList.get(position);if (convertView == null) {convertView = inflater.inflate(R.layout.itemview, null);hodler.icon = (ImageView) convertView.findViewById(R.id.ic_img);hodler.title = (TextView) convertView.findViewById(R.id.title_tv);hodler.connection = (RelativeLayout) convertView.findViewById(R.id.layout_treeview_connection);convertView.setTag(hodler);} else {hodler = (ViewHodler) convertView.getTag();}// -; +;表徵圖處理if (treeElement.isHasChild()) {if (treeElement.isExpandAble()) {if (treeElement.getParentLevel() == 0) {hodler.icon.setImageResource(R.drawable.knowledgetree_rootexpanded);} else {hodler.icon.setImageResource(R.drawable.knowledgetree_expanded);}} else {if (treeElement.getParentLevel() == 0) {hodler.icon.setImageResource(R.drawable.knowledgetree_rootunexpanded);} else {hodler.icon.setImageResource(R.drawable.knowledgetree_unexpanded);}}} else {hodler.icon.setImageResource(R.drawable.knowledgetree_leaf);}// 設定 展開 時，“-”、“+”間的連線if (treeElement.getParentLevel() == 0) {if (position + 1 < getCount()&& mParentList.get(position + 1).getParentLevel() == 0) {hodler.connection.setBackgroundResource(0);} else if (position + 1 == getCount()) {hodler.connection.setBackgroundResource(0);} else {hodler.connection.setBackgroundResource(R.drawable.knowledgetree_halfconnection_root);}} else {if (position + 1 < getCount()&& mParentList.get(position + 1).getParentLevel() == 0) {hodler.connection.setBackgroundResource(R.drawable.knowledgetree_halfconnection_leaf);} else if (position == getCount() - 1)hodler.connection.setBackgroundResource(R.drawable.knowledgetree_halfconnection_leaf);elsehodler.connection.setBackgroundResource(R.drawable.knowledgetree_connection);}// 標題背景設定if (treeElement.getParentLevel() == 0) {hodler.title.setBackgroundColor(Color.BLUE);hodler.title.setPadding(8, 8, 8, 8);} else if (treeElement.getParentLevel() == 1) {hodler.title.setBackgroundColor(Color.RED);hodler.title.setPadding(38, 8, 8, 8);} else if (treeElement.getParentLevel() == 2) {hodler.title.setPadding(78, 8, 8, 8);hodler.title.setBackgroundColor(Color.GRAY);}hodler.title.setTextColor(Color.WHITE);hodler.title.setText(treeElement.getNoteName());return convertView;}@Overridepublic void onExpandClick(int position) {super.onExpandClick(position);}class ViewHodler {ImageView icon;TextView title;RelativeLayout connection;}}

4：主介面
 
 
 
package com.example.androidexpandablelistview;import java.util.ArrayList;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.Window;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;public class MainActivity extends Activity {private ListView mLv;private DetaiTreeAdapter adapter;private ArrayList dataList;private ArrayList seconddataList;private ArrayList thirddataList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initView();initData();initEvent();}/** * 事件處理 */private void initEvent() {mLv.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView arg0, View arg1, int arg2,long arg3) {adapter.onExpandClick(arg2);}});}/** * 資料載入 */private void initData() {dataList  = new ArrayList();seconddataList = new ArrayList();thirddataList = new ArrayList();adapter = new DetaiTreeAdapter(dataList, MainActivity.this);mLv.setAdapter(adapter);//類比三級節點資料for (int i = Data.thridTitle.length-1; i >=0; i--) {TreeElement element = new TreeElement(2, Data.thridTitle[i], new ArrayList(),false, false, i);thirddataList.add(element);}//類比二級節點資料for (int i = Data.secondTitle.length-1; i >=0; i--) {TreeElement element = new TreeElement(1, Data.secondTitle[i],i == 0 ? thirddataList : null, false,i == 0 ? true : false, i);seconddataList.add(element);}//類比一級節點資料for (int i = 0; i < Data.title.length; i++) {TreeElement element = new TreeElement(0, Data.title[i],i == 0 ? seconddataList : null, false, i == 0 ? true: false, i);dataList.add(element);}adapter.notifyDataSetChanged();}private void initView() {mLv = (ListView) findViewById(R.id.lv);}}

5：類比資料
 
 
package com.example.androidexpandablelistview;/** * 類比資料 * @author jrh * */public class Data {public static String title[] = {常識判斷,言語理解,數量關係,判斷推理,資料分析};public static String secondTitle[]={政治,經濟,法律,曆史,人文};public static String thridTitle[] ={時政,馬克思主義哲學,中共黨史,中國特色社會主義體系};}

6：介面布局
 
 
    

7：itemView