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 Android教程網 >> Android技術 >> Android開發實例 >> Android提高十七篇之多級樹形菜單的實現

Android提高十七篇之多級樹形菜單的實現

編輯：Android開發實例

      在Android裡要實現樹形菜單，都是用ExpandableList(也有高手自己繼承ListView或者LinearLayout來做)，但是ExpandableList一般只能實現2級樹形菜單......本文也依然使用ExpandableList，但是要實現的是3級樹形菜單。本文程序運行效果圖：

當用BaseExpandableListAdapter來實現二級樹形菜單時，父項(getGroupView())和子項(getChildView())都是使用TextView。當要實現三級樹形菜單時，子項(getChildView())就必須使用ExpandableList了.......另外還要定義結構體來方便調用三級樹形的數據，二級樹形菜單可以用如下：

 

  1. static public class TreeNode{  
  2.     Object parent;  
  3.     List<Object> childs=new ArrayList<Object>();  
  4. } 

三級樹形菜單可以用如下，子項是二級樹形菜單的結構體：

 

  1. static public class SuperTreeNode {  
  2.     Object parent;  
  3.     //二級樹形菜單的結構體  
  4.     List<TreeViewAdapter.TreeNode> childs = new ArrayList<TreeViewAdapter.TreeNode>();  
  5. } 

實現三級樹形菜單有兩點要注意的：

1、第二級也是個樹形菜單，因此必須在第二級項目展開/回收時設置足夠的空間來完全顯示二級樹形菜單；

2、在實現三級樹形菜單時，發現菜單的方法都是用不了(如OnChildClickListener、OnGroupClickListener等)，因此要獲得選中的數據就必須在外部定義好回調函數，然後在第二級生成二級樹形菜單時回調這個外部函數。

PS：本文在解決No.2關鍵點的時候，只能取得第三級選中的序號.....而第一，第二級依然無法獲取其序號。

main.xml源碼如下：

 

  1. <?xml version="1.0" encoding="utf-8"?>  
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  3.     android:orientation="vertical" android:layout_width="fill_parent" 
  4.     android:layout_height="fill_parent">  
  5.     <LinearLayout android:id="@+id/LinearLayout01" 
  6.         android:layout_width="wrap_content" android:layout_height="wrap_content">  
  7.         <Button android:layout_height="wrap_content" android:text="兩層結構" 
  8.             android:layout_width="160dip" android:id="@+id/btnNormal"></Button>  
  9.         <Button android:layout_height="wrap_content" android:text="三層結構" 
  10.             android:layout_width="160dip" android:id="@+id/btnSuper"></Button>  
  11.     </LinearLayout>  
  12.     <ExpandableListView android:id="@+id/ExpandableListView01" 
  13.         android:layout_width="fill_parent" android:layout_height="fill_parent"></ExpandableListView>  
  14. </LinearLayout>  

testExpandableList.java是主類，調用其他工具類，源碼如下：

 

  1. package com.testExpandableList;  
  2.  
  3.  
  4. import java.util.List;  
  5. import android.app.Activity;  
  6. import android.os.Bundle;  
  7. import android.util.Log;  
  8. import android.view.View;  
  9. import android.widget.Button;  
  10. import android.widget.ExpandableListView;  
  11. import android.widget.ExpandableListView.OnChildClickListener;  
  12. import android.widget.Toast;  
  13.  
  14. public class testExpandableList extends Activity {  
  15.     /** Called when the activity is first created. */ 
  16.     ExpandableListView expandableList;  
  17.     TreeViewAdapter adapter;  
  18.     SuperTreeViewAdapter superAdapter;  
  19.     Button btnNormal,btnSuper;  
  20.     // Sample data set.  children[i] contains the children (String[]) for groups[i].  
  21.     public String[] groups = { "xxxx好友", "xxxx同學", "xxxxx女人"};  
  22.     public String[][]  child= {  
  23.             { "A君", "B君", "C君", "D君" },  
  24.             { "同學甲", "同學乙", "同學丙"},  
  25.             { "御姐", "蘿莉" }  
  26.     };  
  27.       
  28.     public String[] parent = { "xxxx好友", "xxxx同學"};  
  29.     public String[][][]  child_grandson= {  
  30.             {{"A君"},  
  31.                 {"AA","AAA"}},  
  32.             {{"B君"},  
  33.                 {"BBB","BBBB","BBBBB"}},  
  34.             {{"C君"},  
  35.                 {"CCC","CCCC"}},  
  36.             {{"D君"},  
  37.                 {"DDD","DDDD","DDDDD"}},  
  38.     };  
  39.       
  40.     @Override 
  41.     public void onCreate(Bundle savedInstanceState) {  
  42.         super.onCreate(savedInstanceState);  
  43.         setContentView(R.layout.main);  
  44.         this.setTitle("ExpandableListView練習----hellogv");  
  45.         btnNormal=(Button)this.findViewById(R.id.btnNormal);  
  46.         btnNormal.setOnClickListener(new ClickEvent());  
  47.         btnSuper=(Button)this.findViewById(R.id.btnSuper);  
  48.         btnSuper.setOnClickListener(new ClickEvent());  
  49.         adapter=new TreeViewAdapter(this,TreeViewAdapter.PaddingLeft>>1);  
  50.         superAdapter=new SuperTreeViewAdapter(this,stvClickEvent);  
  51.         expandableList=(ExpandableListView) testExpandableList.this.findViewById(R.id.ExpandableListView01);  
  52.     }  
  53.       
  54.     class ClickEvent implements View.OnClickListener{  
  55.  
  56.         @Override 
  57.         public void onClick(View v) {  
  58.             adapter.RemoveAll();  
  59.             adapter.notifyDataSetChanged();  
  60.             superAdapter.RemoveAll();  
  61.             superAdapter.notifyDataSetChanged();  
  62.               
  63.             if(v==btnNormal)  
  64.             {  
  65.                 List<TreeViewAdapter.TreeNode> treeNode = adapter.GetTreeNode();  
  66.                 for(int i=0;i<groups.length;i++)  
  67.                 {  
  68.                     TreeViewAdapter.TreeNode node=new TreeViewAdapter.TreeNode();  
  69.                     node.parent=groups[i];  
  70.                     for(int ii=0;ii<child[i].length;ii++)  
  71.                     {  
  72.                         node.childs.add(child[i][ii]);  
  73.                     }  
  74.                     treeNode.add(node);  
  75.                 }  
  76.                   
  77.                 adapter.UpdateTreeNode(treeNode);       
  78.                 expandableList.setAdapter(adapter);  
  79.                 expandableList.setOnChildClickListener(new OnChildClickListener(){  
  80.  
  81.                     @Override 
  82.                     public boolean onChildClick(ExpandableListView arg0, View arg1,  
  83.                             int parent, int children, long arg4) {  
  84.                           
  85.                         String str="parent id:"+String.valueOf(parent)+",children id:"+String.valueOf(children);  
  86.                         Toast.makeText(testExpandableList.this, str, 300).show();  
  87.                         return false;  
  88.                     }  
  89.                 });  
  90.             }  
  91.             else if(v==btnSuper){  
  92.                 List<SuperTreeViewAdapter.SuperTreeNode> superTreeNode = superAdapter.GetTreeNode();  
  93.                 for(int i=0;i<parent.length;i++)//第一層  
  94.                 {  
  95.                     SuperTreeViewAdapter.SuperTreeNode superNode=new SuperTreeViewAdapter.SuperTreeNode();  
  96.                     superNode.parent=parent[i];  
  97.                       
  98.                     //第二層  
  99.                     for(int ii=0;ii<child_grandson.length;ii++)  
  100.                     {  
  101.                         TreeViewAdapter.TreeNode node=new TreeViewAdapter.TreeNode();  
  102.                         node.parent=child_grandson[ii][0][0];//第二級菜單的標題  
  103.                           
  104.                         for(int iii=0;iii<child_grandson[ii][1].length;iii++)//第三級菜單  
  105.                         {  
  106.                             node.childs.add(child_grandson[ii][1][iii]);  
  107.                         }  
  108.                         superNode.childs.add(node);  
  109.                     }  
  110.                     superTreeNode.add(superNode);  
  111.                       
  112.                 }  
  113.                 superAdapter.UpdateTreeNode(superTreeNode);  
  114.                 expandableList.setAdapter(superAdapter);  
  115.             }  
  116.         }  
  117.     }  
  118.  
  119.     /**  
  120.      * 三級樹形菜單的事件不再可用，本函數由三級樹形菜單的子項（二級菜單）進行回調  
  121.      */ 
  122.     OnChildClickListener stvClickEvent=new OnChildClickListener(){  
  123.  
  124.         @Override 
  125.         public boolean onChildClick(ExpandableListView parent,  
  126.                 View v, int groupPosition, int childPosition,  
  127.                 long id) {  
  128.             String str="parent id:"+String.valueOf(groupPosition)+",children id:"+String.valueOf(childPosition);  
  129.             Toast.makeText(testExpandableList.this, str, 300).show();  
  130.               
  131.             return false;  
  132.         }  
  133.           
  134.     };  
  135. } 

TreeViewAdapter.java是實現二級樹形菜單的工具類，源碼如下：

 

  1. package com.testExpandableList;  
  2.  
  3. import java.util.ArrayList;  
  4. import java.util.List;  
  5. import android.content.Context;  
  6. import android.util.Log;  
  7. import android.view.Gravity;  
  8. import android.view.View;  
  9. import android.view.ViewGroup;  
  10. import android.widget.AbsListView;  
  11. import android.widget.BaseExpandableListAdapter;  
  12. import android.widget.TextView;  
  13.  
  14.  
  15. public class TreeViewAdapter extends BaseExpandableListAdapter{  
  16.     public static final int ItemHeight=48;//每項的高度  
  17.     public static final int PaddingLeft=36;//每項的高度  
  18.     private int myPaddingLeft=0;//如果是由SuperTreeView調用，則作為子項需要往右移  
  19.  
  20.     static public class TreeNode{  
  21.         Object parent;  
  22.         List<Object> childs=new ArrayList<Object>();  
  23.     }  
  24.       
  25.     List<TreeNode> treeNodes = new ArrayList<TreeNode>();  
  26.     Context parentContext;  
  27.       
  28.     public TreeViewAdapter(Context view,int myPaddingLeft)  
  29.     {  
  30.         parentContext=view;  
  31.         this.myPaddingLeft=myPaddingLeft;  
  32.     }  
  33.       
  34.     public List<TreeNode> GetTreeNode()  
  35.     {  
  36.         return treeNodes;  
  37.     }  
  38.       
  39.     public void UpdateTreeNode(List<TreeNode> nodes)  
  40.     {  
  41.         treeNodes=nodes;  
  42.     }  
  43.       
  44.     public void RemoveAll()  
  45.     {  
  46.         treeNodes.clear();  
  47.     }  
  48.       
  49.     public Object getChild(int groupPosition, int childPosition) {  
  50.         return treeNodes.get(groupPosition).childs.get(childPosition);  
  51.     }  
  52.  
  53.     public int getChildrenCount(int groupPosition) {  
  54.         return treeNodes.get(groupPosition).childs.size();  
  55.     }  
  56.  
  57.     static public TextView getTextView(Context context) {  
  58.         AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
  59.                 ViewGroup.LayoutParams.FILL_PARENT, ItemHeight);  
  60.  
  61.         TextView textView = new TextView(context);  
  62.         textView.setLayoutParams(lp);  
  63.         textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
  64.         return textView;  
  65.     }  
  66.  
  67.     public View getChildView(int groupPosition, int childPosition,  
  68.             boolean isLastChild, View convertView, ViewGroup parent) {  
  69.         TextView textView = getTextView(this.parentContext);  
  70.         textView.setText(getChild(groupPosition, childPosition).toString());  
  71.         textView.setPadding(myPaddingLeft+PaddingLeft, 0, 0, 0);  
  72.         return textView;  
  73.     }  
  74.  
  75.     public View getGroupView(int groupPosition, boolean isExpanded,  
  76.             View convertView, ViewGroup parent) {  
  77.         TextView textView = getTextView(this.parentContext);  
  78.         textView.setText(getGroup(groupPosition).toString());  
  79.         textView.setPadding(myPaddingLeft+(PaddingLeft>>1), 0, 0, 0);  
  80.         return textView;  
  81.     }  
  82.  
  83.     public long getChildId(int groupPosition, int childPosition) {  
  84.         return childPosition;  
  85.     }  
  86.  
  87.     public Object getGroup(int groupPosition) {  
  88.         return treeNodes.get(groupPosition).parent;  
  89.     }  
  90.  
  91.     public int getGroupCount() {  
  92.         return treeNodes.size();  
  93.     }  
  94.  
  95.     public long getGroupId(int groupPosition) {  
  96.         return groupPosition;  
  97.     }  
  98.  
  99.     public boolean isChildSelectable(int groupPosition, int childPosition) {  
  100.         return true;  
  101.     }  
  102.  
  103.     public boolean hasStableIds() {  
  104.         return true;  
  105.     }  
  106. }  

SuperTreeViewAdapter.java是實現三級樹形菜單的工具類，會用到TreeViewAdapter.java，源碼如下：

 

  1. package com.testExpandableList;  
  2.  
  3. import java.util.ArrayList;  
  4. import java.util.List;  
  5. import com.testExpandableList.TreeViewAdapter.TreeNode;  
  6. import android.content.Context;  
  7. import android.view.View;  
  8. import android.view.ViewGroup;  
  9. import android.widget.AbsListView;  
  10. import android.widget.BaseExpandableListAdapter;  
  11. import android.widget.ExpandableListView;  
  12. import android.widget.ExpandableListView.OnChildClickListener;  
  13. import android.widget.ExpandableListView.OnGroupCollapseListener;  
  14. import android.widget.ExpandableListView.OnGroupExpandListener;  
  15. import android.widget.TextView;  
  16.  
  17. public class SuperTreeViewAdapter extends BaseExpandableListAdapter {  
  18.  
  19.     static public class SuperTreeNode {  
  20.         Object parent;  
  21.         //二級樹形菜單的結構體  
  22.         List<TreeViewAdapter.TreeNode> childs = new ArrayList<TreeViewAdapter.TreeNode>();  
  23.     }  
  24.  
  25.     private List<SuperTreeNode> superTreeNodes = new ArrayList<SuperTreeNode>();  
  26.     private Context parentContext;  
  27.     private OnChildClickListener stvClickEvent;//外部回調函數  
  28.       
  29.     public SuperTreeViewAdapter(Context view,OnChildClickListener stvClickEvent) {  
  30.         parentContext = view;  
  31.         this.stvClickEvent=stvClickEvent;  
  32.     }  
  33.  
  34.     public List<SuperTreeNode> GetTreeNode() {  
  35.         return superTreeNodes;  
  36.     }  
  37.  
  38.     public void UpdateTreeNode(List<SuperTreeNode> node) {  
  39.         superTreeNodes = node;  
  40.     }  
  41.       
  42.     public void RemoveAll()  
  43.     {  
  44.         superTreeNodes.clear();  
  45.     }  
  46.       
  47.     public Object getChild(int groupPosition, int childPosition) {  
  48.         return superTreeNodes.get(groupPosition).childs.get(childPosition);  
  49.     }  
  50.  
  51.     public int getChildrenCount(int groupPosition) {  
  52.         return superTreeNodes.get(groupPosition).childs.size();  
  53.     }  
  54.  
  55.     public ExpandableListView getExpandableListView() {  
  56.         AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
  57.                 ViewGroup.LayoutParams.FILL_PARENT, TreeViewAdapter.ItemHeight);  
  58.         ExpandableListView superTreeView = new ExpandableListView(parentContext);  
  59.         superTreeView.setLayoutParams(lp);  
  60.         return superTreeView;  
  61.     }  
  62.  
  63.     /**  
  64.      * 三層樹結構中的第二層是一個ExpandableListView  
  65.      */   
  66.     public View getChildView(int groupPosition, int childPosition,  
  67.             boolean isLastChild, View convertView, ViewGroup parent) {  
  68.         // 是   
  69.         final ExpandableListView treeView = getExpandableListView();  
  70.         final TreeViewAdapter treeViewAdapter = new TreeViewAdapter(this.parentContext,0);  
  71.         List<TreeNode> tmp = treeViewAdapter.GetTreeNode();//臨時變量取得TreeViewAdapter的TreeNode集合，可為空  
  72.         final TreeNode treeNode=(TreeNode) getChild(groupPosition, childPosition);  
  73.         tmp.add(treeNode);  
  74.         treeViewAdapter.UpdateTreeNode(tmp);  
  75.         treeView.setAdapter(treeViewAdapter);  
  76.           
  77.         //關鍵點：取得選中的二級樹形菜單的父子節點,結果返回給外部回調函數  
  78.         treeView.setOnChildClickListener(this.stvClickEvent);  
  79.           
  80.         /**  
  81.          * 關鍵點：第二級菜單展開時通過取得節點數來設置第三級菜單的大小  
  82.          */ 
  83.         treeView.setOnGroupExpandListener(new OnGroupExpandListener() {  
  84.             @Override 
  85.             public void onGroupExpand(int groupPosition) {  
  86.                   
  87.                 AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
  88.                         ViewGroup.LayoutParams.FILL_PARENT,  
  89.                         (treeNode.childs.size()+1)*TreeViewAdapter.ItemHeight + 10);  
  90.                 treeView.setLayoutParams(lp);  
  91.             }  
  92.         });  
  93.           
  94.         /**  
  95.          * 第二級菜單回收時設置為標准Item大小  
  96.          */ 
  97.         treeView.setOnGroupCollapseListener(new OnGroupCollapseListener() {  
  98.             @Override 
  99.             public void onGroupCollapse(int groupPosition) {  
  100.                   
  101.                 AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,  
  102.                         TreeViewAdapter.ItemHeight);  
  103.                 treeView.setLayoutParams(lp);  
  104.             }  
  105.         });  
  106.         treeView.setPadding(TreeViewAdapter.PaddingLeft, 0, 0, 0);  
  107.         return treeView;  
  108.     }  
  109.  
  110.     /**  
  111.      * 三級樹結構中的首層是TextView,用於作為title  
  112.      */ 
  113.     public View getGroupView(int groupPosition, boolean isExpanded,  
  114.             View convertView, ViewGroup parent) {  
  115.         TextView textView = TreeViewAdapter.getTextView(this.parentContext);  
  116.         textView.setText(getGroup(groupPosition).toString());  
  117.         textView.setPadding(TreeViewAdapter.PaddingLeft, 0, 0, 0);  
  118.         return textView;  
  119.     }  
  120.  
  121.     public long getChildId(int groupPosition, int childPosition) {  
  122.         return childPosition;  
  123.     }  
  124.  
  125.     public Object getGroup(int groupPosition) {  
  126.         return superTreeNodes.get(groupPosition).parent;  
  127.     }  
  128.  
  129.     public int getGroupCount() {  
  130.         return superTreeNodes.size();  
  131.     }  
  132.  
  133.     public long getGroupId(int groupPosition) {  
  134.         return groupPosition;  
  135.     }  
  136.  
  137.     public boolean isChildSelectable(int groupPosition, int childPosition) {  
  138.         return true;  
  139.     }  
  140.  
  141.     public boolean hasStableIds() {  
  142.         return true;  
  143.     }  
  144. }  

總結，使用ExpandableList實現三級樹形菜單時有些bug不好解決，而且定義三維數組的時候也要倍加小心......所以盡量把數據化簡來使用二級樹形菜單。

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