Android-用ListView模仿ExpandableListView

转载请注明出处：http://blog.csdn.net/goldenfish1919/article/details/38334995

既然有现成的ExpandableListView，为啥还非得仿一个啊？是不是脱裤子放屁多此一举呢？当然不是的。ExpandableListView只能支持两层啊，假如你想支持三层或者更多层呢？或者说页面结构比较复杂，就像这样的：

1. public class MainActivity extends Activity {  
2.       
3.     private ListViewAdapter listViewAdapter;  
4.       
5.     @Override  
6.     protected void onCreate(Bundle savedInstanceState) {  
7.         super.onCreate(savedInstanceState);  
8.         setContentView(R.layout.activity_main);  
9.         //数据  
10.         List<GroupBean> itemList = getListData();  
11.         //view和adapter  
12.         ListView listView = (ListView)findViewById(R.id.listview);  
13.         listViewAdapter = new ListViewAdapter(this, itemList);  
14.         //给adapter设置监听  
15.         listViewAdapter.setGroupListener(new OnGroupClickListener(){  
16.             @Override  
17.             public void onGroupClicked(GroupView view, GroupBean group,int position) {  
18.                 Toast.makeText(MainActivity.this, "I am "+ group.getName(), Toast.LENGTH_SHORT).show();  
19.             }  
20.         });  
21.         listViewAdapter.setChildListener(new OnChildClickListener(){  
22.             @Override  
23.             public void onChildClicked(ChildView view, ChildBean child,int position) {  
24.                 Toast.makeText(MainActivity.this, "I am "+ child.getName(), Toast.LENGTH_SHORT).show();  
25.             }  
26.         });  
27.         listView.setAdapter(listViewAdapter);  
28.     }  
29.       
30.     @Override  
31.     protected void onDestroy() {  
32.         if(listViewAdapter != null){  
33.             listViewAdapter.destroy();  
34.             listViewAdapter = null;  
35.         }  
36.         super.onDestroy();  
37.     }  
38.   
39.     private static interface OnGroupClickListener{  
40.         public void onGroupClicked(GroupView view, GroupBean group, int position);  
41.     }  
42.       
43.     private static interface OnChildClickListener{  
44.         public void onChildClicked(ChildView view, ChildBean child, int position);  
45.     }  
46.       
47.     private static class ListViewAdapter extends BaseAdapter{  
48.           
49.         private static final int VIEW_TYPE_GROUP = 0;  
50.         private static final int VIEW_TYPE_CHILD = 1;  
51.           
52.         private Context context;  
53.         private List<GroupBean> groupList;  
54.         private OnGroupClickListener groupListener;  
55.         private OnChildClickListener childListener;  
56.           
57.         public ListViewAdapter(Context context, List<GroupBean> groupList){  
58.             this.context = context;  
59.             this.groupList = groupList;  
60.         }  
61.         @Override  
62.         public int getCount() {  
63.             if(groupList == null || groupList.size() <= 0){  
64.                 return 0;  
65.             }  
66.             int count = 0;  
67.             for(GroupBean group : groupList){  
68.                 count ++;  
69.                 List<ChildBean> childList = group.getChildList();  
70.                 if(childList == null){  
71.                     continue;  
72.                 }  
73.                 if(group.isExpand()){  
74.                     count += childList.size();  
75.                 }  
76.             }  
77.             return count;  
78.         }  
79.         @Override  
80.         public Object getItem(int index) {  
81.             if(groupList == null || groupList.size() <= 0){  
82.                 return null;  
83.             }  
84.             int count = 0 ;  
85.             for(int i=0;i<groupList.size();i++){  
86.                 GroupBean group = groupList.get(i);  
87.                 if(index == count){  
88.                     return group;  
89.                 }  
90.                 count++;  
91.                 if(!group.isExpand()){  
92.                     continue;  
93.                 }  
94.                 List<ChildBean> childList = group.getChildList();  
95.                 if(childList == null){  
96.                     continue;  
97.                 }  
98.                 for(int j=0;j<childList.size();j++){  
99.                     ChildBean child = childList.get(j);  
100.                     if(index == count){  
101.                         return child;  
102.                     }  
103.                     count++;  
104.                 }  
105.             }  
106.             return null;  
107.         }  
108.         @Override  
109.         public long getItemId(int itemid) {  
110.             return itemid;  
111.         }  
112.         @Override  
113.         public View getView(final int position, View convertView, ViewGroup parent) {  
114.             ViewHolder holder = null;  
115.             if(convertView == null){  
116.                 holder = new ViewHolder();  
117.                 int type = getItemViewType(position);  
118.                 if(type == VIEW_TYPE_GROUP){  
119.                     convertView = new GroupView(context, parent);  
120.                     holder.groupView = (GroupView)convertView;  
121.                 }else{  
122.                     convertView = new ChildView(context, parent);  
123.                     holder.childView = (ChildView)convertView;  
124.                 }  
125.                 convertView.setTag(holder);  
126.             }else{  
127.                 holder = (ViewHolder)convertView.getTag();  
128.             }  
129.             int type = getItemViewType(position);  
130.             if(type == VIEW_TYPE_GROUP){  
131.                 final GroupView groupView = holder.groupView;  
132.                 final GroupBean groupBean = (GroupBean)getItem(position);  
133.                 groupView.setName(groupBean.getName());  
134.                 groupView.setExpand(groupBean.isExpand());  
135.                 groupView.setOnClickListener(new View.OnClickListener() {  
136.                     @Override  
137.                     public void onClick(View v) {  
138.                         groupBean.setExpand(!groupBean.isExpand());  
139.                         notifyDataSetChanged();  
140.                         if(groupListener != null){  
141.                             groupListener.onGroupClicked(groupView, groupBean, position);  
142.                         }  
143.                     }  
144.                 });  
145.                 return groupView;  
146.             }else{  
147.                 final ChildView childView = holder.childView;  
148.                 final ChildBean childBean = (ChildBean)getItem(position);  
149.                 childView.setName(childBean.getName());  
150.                 childView.setOnClickListener(new View.OnClickListener() {  
151.                     @Override  
152.                     public void onClick(View v) {  
153.                         if(childListener != null){  
154.                             childListener.onChildClicked(childView, childBean, position);  
155.                         }  
156.                     }  
157.                 });  
158.                 return childView;  
159.             }  
160.         }  
161.           
162.         @Override  
163.         public int getItemViewType(int position) {  
164.             Object item = getItem(position);  
165.             if(item instanceof GroupBean){  
166.                 return VIEW_TYPE_GROUP;  
167.             }else{  
168.                 return VIEW_TYPE_CHILD;  
169.             }  
170.         }  
171.         @Override  
172.         public int getViewTypeCount() {  
173.             return 2;  
174.         }  
175.           
176.         public void setGroupListener(OnGroupClickListener groupListener) {  
177.             this.groupListener = groupListener;  
178.         }  
179.           
180.         public void setChildListener(OnChildClickListener childListener) {  
181.             this.childListener = childListener;  
182.         }  
183.           
184.         public void destroy(){  
185.             this.context = null;  
186.             this.groupList = null;  
187.             this.groupListener = null;  
188.             this.childListener = null;  
189.         }  
190.           
191.         private class ViewHolder{  
192.             GroupView groupView;  
193.             ChildView childView;  
194.         }  
195.     }  
196.       
197.     private List<GroupBean> getListData(){  
198.         List<GroupBean> itemList = new ArrayList<GroupBean>();  
199.         for(int i=0;i<10;i++){  
200.             GroupBean group = new GroupBean();  
201.             group.setName("group_"+(i+1));  
202.             List<ChildBean> childList = new ArrayList<ChildBean>();  
203.             for(int j=0;j<3;j++){  
204.                 ChildBean child = new ChildBean();  
205.                 child.setName("child"+j);  
206.                 childList.add(child);  
207.             }  
208.             group.setChildList(childList);  
209.             itemList.add(group);  
210.         }  
211.         return itemList;  
212.     }  
213.       
214.     private static class GroupBean{  
215.         private boolean isExpand;  
216.         private String name;  
217.         private List<ChildBean> childList;  
218.           
219.         public String getName() {  
220.             return name;  
221.         }  
222.         public void setName(String name) {  
223.             this.name = name;  
224.         }  
225.         public List<ChildBean> getChildList() {  
226.             return childList;  
227.         }  
228.         public void setChildList(List<ChildBean> childList) {  
229.             this.childList = childList;  
230.         }  
231.         public boolean isExpand() {  
232.             return isExpand;  
233.         }  
234.         public void setExpand(boolean isExpand) {  
235.             this.isExpand = isExpand;  
236.         }  
237.           
238.     }  
239.       
240.     private static class ChildBean{  
241.         private String name;  
242.         public String getName() {  
243.             return name;  
244.         }  
245.         public void setName(String name) {  
246.             this.name = name;  
247.         }  
248.     }  
249.       
250.     private static class GroupView extends RelativeLayout {  
251.         private TextView nameView;  
252.         private ImageView arrowView;  
253.         public GroupView(Context context, ViewGroup parent) {  
254.             super(context);  
255.             init(parent);  
256.         }  
257.         private void init(ViewGroup parent) {  
258.             final LayoutInflater mLayoutInflater = LayoutInflater.from(getContext());  
259.             View v = mLayoutInflater.inflate(R.layout.list_item_group, parent, false);  
260.             addView(v);  
261.             nameView = (TextView)v.findViewById(R.id.username);  
262.             arrowView = (ImageView)v.findViewById(R.id.group_arrow);  
263.         }  
264.         public void setName(String name) {  
265.             this.nameView.setText(name);  
266.         }  
267.         public void setExpand(boolean expand){  
268.             if(expand){  
269.                 arrowView.setBackgroundResource(R.drawable.arrow_down);  
270.             }else{  
271.                 arrowView.setBackgroundResource(R.drawable.arrow_right);  
272.             }  
273.         }  
274.     }  
275.       
276.     private static class ChildView extends RelativeLayout {  
277.         private TextView nameView;  
278.         public ChildView(Context context,  ViewGroup parent) {  
279.             super(context);  
280.             init(parent);  
281.         }  
282.         private void init(ViewGroup parent) {  
283.             final LayoutInflater mLayoutInflater = LayoutInflater.from(getContext());  
284.             View v = mLayoutInflater.inflate(R.layout.list_item_child, parent, false);  
285.             addView(v);  
286.             nameView = (TextView)v.findViewById(R.id.username);  
287.         }  
288.         public void setName(String name) {  
289.             this.nameView.setText(name);  
290.         }  
291.     }  
292. }  

activity_main.xml:

[html] view plaincopy

1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     android:orientation="vertical" >  
6.     <ListView  
7.         android:id="@+id/listview"  
8.         android:layout_width="match_parent"  
9.         android:layout_height="match_parent" />  
10. </LinearLayout>  

list_item_group.xml

[java] view plaincopy

1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="wrap_content" >  
5.     <ImageView  
6.         android:id="@+id/group_arrow"  
7.         android:layout_width="wrap_content"  
8.         android:layout_height="wrap_content"  
9.         android:layout_alignParentLeft="true"  
10.         android:layout_centerVertical="true"  
11.         android:layout_marginLeft="20dp" />  
12.     <TextView  
13.         android:id="@+id/username"  
14.         android:layout_width="wrap_content"  
15.         android:layout_height="50dp"  
16.         android:layout_centerInParent="true" />  
17. </RelativeLayout>  

list_item_child.xml:

[java] view plaincopy

1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="wrap_content" >  
5.     <ImageView  
6.         android:id="@+id/usericon"  
7.         android:layout_width="50dp"  
8.         android:layout_height="50dp"  
9.         android:src="@drawable/ic_launcher" />  
10.     <TextView  
11.         android:id="@+id/username"  
12.         android:layout_width="wrap_content"  
13.         android:layout_height="wrap_content"  
14.         android:layout_marginLeft="20dp"  
15.         android:layout_toRightOf="@id/usericon" />  
16. </RelativeLayout>  

源码在：http://download.csdn.net/detail/goldenfish1919/7703143