Android ExpandableList 可折叠列表视图例程

瀚文

在Android开发的过程中，大家希望能实现可折叠列表视图，其实很简单，本例程就是讲解动态创建可折叠列表视图。由于本地系统是日文系统。Eclispse中写注释乱码。注释就用英文写的，只是个简单说明，我想大家能看懂。就是英文太乱了，别见怪啊。
首先 自己创建工程，默认的各XML文件无需修改。

其次 Java 的代码 要继承 ExpandableListActivity

AndroidEggExpandableListActivity.java

1. /**
   
2. * www.androidegg.com
   
3. */
   
4. package androidegg.com.study.ExpandableList;
   
5. 
   
6. import java.util.ArrayList;
   
7. import java.util.HashMap;
   
8. import java.util.List;
   
9. import java.util.Map;
   
10. 
    
11. import android.app.ExpandableListActivity;
    
12. import android.os.Bundle;
    
13. import android.util.Log;
    
14. import android.view.View;
    
15. import android.widget.ExpandableListAdapter;
    
16. import android.widget.ExpandableListView;
    
17. import android.widget.SimpleExpandableListAdapter;
    
18. 
    
19. public class AndroidEggExpandableListActivity extends ExpandableListActivity {
    
20.     /** Called when the activity is first created. */
    
21.     @Override
    
22.     public void onCreate(Bundle savedInstanceState) {
    
23.         super.onCreate(savedInstanceState);
    
24. 
    
25.         // parent list
    
26.         List<Map<String, Object>> parentList = new ArrayList<Map<String,Object>>();
    
27. 
    
28.         // child list
    
29.         //
    
30.         List<List<Map<String, Object>>> allChildList = new ArrayList<List<Map<String,Object>>>();
    
31. 
    
32.         // create 3 parent
    
33.         for(int i = 0; i < 3; i++){
    
34.             // Map of parent
    
35.            
    
36.             Map<String, Object> parentData = new HashMap<String, Object>();
    
37. 
    
38.             // create parent's title
    
39.             parentData.put("TITLE", "Parent" + i);
    
40. 
    
41.             // set Map list
    
42.             parentList.add(parentData);
    
43. 
    
44.             // every parent create 5 child
    
45.             List<Map<String, Object>> childList = new ArrayList<Map<String,Object>>();
    
46.             for(int j = 0; j < 5; j++){
    
47.                 // create child's title
    
48.                 Map<String, Object> childData = new HashMap<String, Object>();
    
49.                 childData.put("TITLE", "Second" + j);
    
50.                 childData.put("SUMMARY", "summary" + j);
    
51.                 childList.add(childData);
    
52.             }
    
53. 
    
54.             // all child set
    
55.             allChildList.add(childList);
    
56.         }
    
57. 
    
58.         // create adapter
    
59.         SimpleExpandableListAdapter adapter = new SimpleExpandableListAdapter(
    
60.                 this,
    
61.                 parentList,
    
62.                 android.R.layout.simple_expandable_list_item_1,
    
63.                 new String []{"TITLE"},
    
64.                 new int []{android.R.id.text1},
    
65.                 allChildList,
    
66.                 android.R.layout.simple_expandable_list_item_2,
    
67.                 new String []{"TITLE", "SUMMARY"},
    
68.                 new int []{android.R.id.text1, android.R.id.text2}
    
69.         );
    
70. 
    
71.         // Adapter set
    
72.         setListAdapter(adapter);
    
73. 
    
74.         // create child's OnChildClickListener
    
75.         ExpandableListView listView = getExpandableListView();
    
76.         listView.setOnChildClickListener(new ExpandableListView.OnChildClickListener(){
    
77. 
    
78.             /** child click method */
    
79.             @SuppressWarnings("unchecked")
    
80.             @Override
    
81.             public boolean onChildClick(
    
82.                     ExpandableListView parent,
    
83.                     View v,
    
84.                     int groupPosition,
    
85.                     int childPosition,
    
86.                     long id)
    
87.             {
    
88.                 // get parent data
    
89.                 ExpandableListAdapter adapter = parent.getExpandableListAdapter();
    
90. 
    
91.                 // get child data
    
92.                 Map<String, Object> childMap = (Map<String, Object>)adapter.getChild(
    
93.                         groupPosition,
    
94.                         childPosition
    
95.                 );
    
96. 
    
97.                 // output log
    
98.                 Log.d("SampleActivity", "TITLE: " + childMap.get("TITLE"));
    
99.                 Log.d("SampleActivity", "SUMMARY: " + childMap.get("SUMMARY"));
    
100. 
     
101.                 return false;
     
102.             }
     
103.         });
     
104.     }
     
105. }

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运行结果如下



二，今天给大家讲一下自己设计ExpandableListAdapter,这样大家就可以充分的发挥想象力设计你想要的布局了，直接贴代码吧。

1. package com.wistron.expandablelist;
   
2. 
   
3. import java.util.List;
   
4. import java.util.Map;
   
5. 
   
6. import android.content.Context;
   
7. import android.graphics.Color;
   
8. import android.view.Gravity;
   
9. import android.view.View;
   
10. import android.view.ViewGroup;
    
11. import android.widget.BaseExpandableListAdapter;
    
12. import android.widget.ImageView;
    
13. import android.widget.LinearLayout;
    
14. import android.widget.TextView;
    
15. 
    
16. public class ListAdapter extends BaseExpandableListAdapter {
    
17. private Context context;
    
18. private List<Map<String, Object>> parentList;
    
19. private List<List<Map<String, Object>>> allChildList;
    
20. public ListAdapter(Context context,
    
21.    List<Map<String, Object>> parentList,
    
22.    List<List<Map<String, Object>>> allChildList) {
    
23.   // TODO Auto-generated constructor stub
    
24.   this.context=context;
    
25.   this.parentList=parentList;
    
26.   this.allChildList=allChildList;
    
27. }
    
28. 
    
29. @Override
    
30. public Object getChild(int groupPosition, int childPosition) {
    
31.   // TODO Auto-generated method stub
    
32.   return allChildList.get(groupPosition).get(childPosition);
    
33. }
    
34. 
    
35. @Override
    
36. public long getChildId(int groupPosition, int childPosition) {
    
37.   // TODO Auto-generated method stub
    
38.   return childPosition;
    
39. }
    
40. 
    
41. @Override
    
42. public View getChildView(int groupPosition, int childPosition,
    
43.    boolean isLastChild, View convertView, ViewGroup parent) {
    
44.   // TODO Auto-generated method stub
    
45.   LinearLayout layout=new LinearLayout(context);
    
46.   layout.setOrientation(LinearLayout.VERTICAL);
    
47.   LinearLayout subLayout1=new LinearLayout(context);
    
48.   LinearLayout subLayout2=new LinearLayout(context);
    
49.   subLayout1.setOrientation(LinearLayout.HORIZONTAL);
    
50.   subLayout2.setOrientation(LinearLayout.HORIZONTAL);
    
51.   TextView text1=new TextView(context);
    
52.   TextView text2=new TextView(context);
    
53.   TextView dot1=new TextView(context);
    
54.   TextView dot2=new TextView(context);
    
55.   text1.setText(allChildList.get(groupPosition).get(childPosition).get("TITLE").toString());
    
56.   text2.setText(allChildList.get(groupPosition).get(childPosition).get("SUMMARY").toString());
    
57.   dot1.setTextSize(20);
    
58.   dot1.setGravity(Gravity.CENTER);
    
59.   dot1.setText(".");
    
60.   dot2.setTextSize(20);
    
61.   dot2.setGravity(Gravity.CENTER);
    
62.   dot2.setText(".");
    
63.   subLayout1.addView(dot1);
    
64.   subLayout1.addView(text1);
    
65.   subLayout2.addView(dot2);
    
66.   subLayout2.addView(text2);
    
67.   layout.addView(subLayout1);
    
68.   layout.addView(subLayout2);
    
69.   return layout;
    
70. }
    
71. 
    
72. @Override
    
73. public int getChildrenCount(int groupPosition) {
    
74.   // TODO Auto-generated method stub
    
75.   return allChildList.size();
    
76. }
    
77. 
    
78. @Override
    
79. public Object getGroup(int groupPosition) {
    
80.   // TODO Auto-generated method stub
    
81.   return parentList.get(groupPosition);
    
82. }
    
83. 
    
84. @Override
    
85. public int getGroupCount() {
    
86.   // TODO Auto-generated method stub
    
87.   return parentList.size();
    
88. }
    
89. 
    
90. @Override
    
91. public long getGroupId(int groupPosition) {
    
92.   // TODO Auto-generated method stub
    
93.   return groupPosition;
    
94. }
    
95. 
    
96. @Override
    
97. public View getGroupView(int groupPosition, boolean isExpanded,
    
98.    View convertView, ViewGroup parent) {
    
99.   // TODO Auto-generated method stub
    
100.   LinearLayout layout=new LinearLayout(context);
     
101.   layout.setBackgroundColor(Color.LTGRAY);
     
102.   ImageView mImage=new ImageView(context);
     
103.   TextView title=new TextView(context);
     
104.   mImage.setImageResource(R.drawable.icon);
     
105.   title.setText(parentList.get(groupPosition).get("TITLE").toString());
     
106.   layout.addView(mImage);
     
107.   layout.addView(title);
     
108.   return layout;
     
109. }
     
110. 
     
111. @Override
     
112. public boolean hasStableIds() {
     
113.   // TODO Auto-generated method stub
     
114.   return false;
     
115. }
     
116. 
     
117. @Override
     
118. public boolean isChildSelectable(int groupPosition, int childPosition) {
     
119.   // TODO Auto-generated method stub
     
120.   return false;
     
121. }
     
122. 
     
123. }
     
124. 
     
125. 2.使用。
     
126. 
     
127. ListAdapter adapter=new ListAdapter(this,parentList,allChildList);
     
128. setListAdapter(adapter);

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对于用过适配器的朋友来说应该不难理解，好了，看效果图吧，不懂的可留言给我。
3.效果图