基于ListView和CheckBox实现多选和全选记录的功能

应用开发中经常会有从数据库中读取数据显示，然后选中多条、全部记录并且删除的需求。在做定制系统联系人的时候也遇到这样的需求，下面写个简单的通过ListView和CheckBox实现多选、全选的例子。下面是具体的代码，有问题请留言。代码下载地址：MultiSelect.rar

 

MultiSelectActivity

[java] view plaincopy

1. /** 
2.  * @author [e-mail]  
3.  * MultiSelectActivity 
4.  */  
5. public class MultiSelectActivity extends Activity implements OnClickListener,  
6.         OnItemClickListener {  
7.     private static final String TAG = "MultiSelectActivity";  
8.     private ListView contactsDelList;  
9.     private Button contactsDelBtn;  
10.     private Button contactsCancelBtn;  
11.     private CheckBox selectAll;  
12.     private Cursor cursor;  
13.     private ContactsDeleteAdapter contactsDeleteAdapter;  
14.   
15.     private static final String[] PROJECTION = new String[] { Contacts._ID,  
16.             Contacts.DISPLAY_NAME };  
17.     private static final int CONTACTS_ID_INDEX = 0;  
18.     private static final int DISPLAY_NAME_INDEX = 1;  
19.     private ContactsDeleteListItemViews holderViews;  
20.   
21.     private final class ContactsDeleteListItemViews {  
22.         TextView nameView;  
23.         CheckBox delCheckBox;  
24.     }  
25.   
26.     @Override  
27.     public void onCreate(Bundle savedInstanceState) {  
28.         super.onCreate(savedInstanceState);  
29.         setContentView(R.layout.contacts_delete_activity);  
30.         contactsDelList = (ListView) findViewById(R.id.contacts_delete_list);  
31.         contactsDelBtn = (Button) findViewById(R.id.contacts_delete_btn);  
32.         contactsCancelBtn = (Button) findViewById(R.id.contacts_cancel_btn);  
33.         selectAll = (CheckBox) (findViewById(R.id.contacts_delete_list_header)  
34.                 .findViewById(R.id.select_all));  
35.         contactsDelList.setOnItemClickListener(this);  
36.         contactsDelBtn.setOnClickListener(this);  
37.         contactsCancelBtn.setOnClickListener(this);  
38.         selectAll.setOnClickListener(this);  
39.     }  
40.   
41.     @Override  
42.     protected void onResume() {  
43.         super.onResume();  
44.         refreshData();  
45.     }  
46.   
47.     // 查询数据库  
48.     private void refreshData() {  
49.         cursor = getContentResolver().query(Contacts.CONTENT_URI, PROJECTION,  
50.                 null, null, null);  
51.         contactsDeleteAdapter = new ContactsDeleteAdapter(this, cursor);  
52.         contactsDelList.setAdapter(contactsDeleteAdapter);  
53.     }  
54.   
55.     class ContactsDeleteAdapter extends BaseAdapter {  
56.         Cursor cur;  
57.         Map<Integer, Boolean> selectedMap;  
58.         HashSet<String> delContactsIdSet;  
59.   
60.         public ContactsDeleteAdapter(Context context, Cursor c) {  
61.             cur = c;  
62.             // 保存每条记录是否被选中的状态  
63.             selectedMap = new HashMap<Integer, Boolean>();  
64.             // 保存被选中记录作数据库表中的Id  
65.             delContactsIdSet = new HashSet<String>();  
66.   
67.             for (int i = 0; i < cur.getCount(); i++) {  
68.                 selectedMap.put(i, false);  
69.             }  
70.         }  
71.   
72.         @Override  
73.         public View getView(int position, View convertView, ViewGroup parent) {  
74.             if (convertView == null) {  
75.                 convertView = LayoutInflater.from(MultiSelectActivity.this)  
76.                         .inflate(R.layout.contacts_delete_list_item, null);  
77.                 holderViews = new ContactsDeleteListItemViews();  
78.                 holderViews.nameView = (TextView) convertView  
79.                         .findViewById(R.id.name);  
80.                 holderViews.delCheckBox = (CheckBox) convertView  
81.                         .findViewById(R.id.delete_list_item);  
82.                 convertView.setTag(holderViews);  
83.             }  
84.             cur.moveToPosition(position);  
85.             ContactsDeleteListItemViews views = (ContactsDeleteListItemViews) convertView  
86.                     .getTag();  
87.             final String name = cur.getString(DISPLAY_NAME_INDEX);  
88.             views.nameView.setText(name);  
89.             views.delCheckBox.setChecked(selectedMap.get(position));  
90.             // 保存记录Id  
91.             if (selectedMap.get(position)) {  
92.                 delContactsIdSet.add(String.valueOf(cur  
93.                         .getInt(CONTACTS_ID_INDEX)));  
94.             } else {  
95.                 delContactsIdSet.remove(String.valueOf(cur  
96.                         .getInt(CONTACTS_ID_INDEX)));  
97.             }  
98.             return convertView;  
99.         }  
100.   
101.         @Override  
102.         public int getCount() {  
103.             return cur.getCount();  
104.         }  
105.   
106.         @Override  
107.         public Object getItem(int position) {  
108.             if (cur.moveToPosition(position)) {  
109.                 return cur;  
110.             } else {  
111.                 return null;  
112.             }  
113.         }  
114.   
115.         @Override  
116.         public long getItemId(int position) {  
117.             return position;  
118.         }  
119.     }  
120.   
121.     @Override  
122.     public void onClick(View v) {  
123.         switch (v.getId()) {  
124.         case R.id.select_all:  
125.             // 全选CheckBox的click事件处理  
126.             if (selectAll.isChecked()) {  
127.                 for (int i = 0; i < contactsDeleteAdapter.getCount(); i++) {  
128.                     contactsDeleteAdapter.selectedMap.put(i, true);  
129.                     //click事件：全选checkbox被勾选则把所有的联系人ID添加到delContactsIdSet中  
130.                     contactsDeleteAdapter.cur.moveToPosition(i);  
131.                     contactsDeleteAdapter.delContactsIdSet.add(String  
132.                             .valueOf(contactsDeleteAdapter.cur  
133.                                     .getInt(CONTACTS_ID_INDEX)));  
134.                 }  
135.                 contactsDelBtn.setEnabled(true);  
136.             } else {  
137.                 for (int i = 0; i < contactsDeleteAdapter.getCount(); i++) {  
138.                     contactsDeleteAdapter.selectedMap.put(i, false);  
139.                 }  
140.                 //click事件：全选checkbox被取消勾选则把delContactsIdSet清空  
141.                 contactsDeleteAdapter.delContactsIdSet.clear();  
142.                 contactsDelBtn.setEnabled(false);  
143.             }  
144.             contactsDeleteAdapter.notifyDataSetChanged();  
145.             break;  
146.         case R.id.contacts_delete_btn:  
147.             new AlertDialog.Builder(this).setTitle(  
148.                     R.string.clearConfirmation_title).setMessage(  
149.                     R.string.clearConfirmation).setNegativeButton(  
150.                     android.R.string.cancel, null).setPositiveButton(  
151.                     android.R.string.ok, new DialogInterface.OnClickListener() {  
152.                         @Override  
153.                         public void onClick(DialogInterface dialog, int which) {  
154.                             final ProgressDialog progressDialog = ProgressDialog  
155.                                     .show(  
156.                                             MultiSelectActivity.this,  
157.                                             getString(R.string.clearProgress_title),  
158.                                             "", true, false);  
159.                             final AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {  
160.                                 @Override  
161.                                 protected Void doInBackground(Void... params) {  
162.                                     // 删除记录事件处理（我这里就不写详细的代码了）  
163.                                     return null;  
164.                                 }  
165.   
166.                                 @Override  
167.                                 protected void onPostExecute(Void result) {  
168.                                     progressDialog.dismiss();  
169.                                 }  
170.                             };  
171.                             progressDialog.show();  
172.                             task.execute();  
173.                         }  
174.                     }).setCancelable(true).create().show();  
175.             break;  
176.         case R.id.contacts_cancel_btn:  
177.             // 取消事件处理  
178.             break;  
179.         }  
180.     }  
181.   
182.     @Override  
183.     public void onItemClick(AdapterView<?> arg0, View view, int position,  
184.             long id) {  
185.         Log.i(TAG, "onItemClick");  
186.         ContactsDeleteListItemViews views = (ContactsDeleteListItemViews) view  
187.                 .getTag();  
188.         views.delCheckBox.toggle();  
189.         contactsDeleteAdapter.selectedMap.put(position, views.delCheckBox  
190.                 .isChecked());  
191.         contactsDeleteAdapter.notifyDataSetChanged();  
192.         // 判断是否有记录没被选中，以便修改全选CheckBox勾选状态  
193.         if (contactsDeleteAdapter.selectedMap.containsValue(false)) {  
194.             selectAll.setChecked(false);  
195.         } else {  
196.             selectAll.setChecked(true);  
197.         }  
198.         // 判断是否有记录被选中，以便设置删除按钮是否可用  
199.         if (contactsDeleteAdapter.selectedMap.containsValue(true)) {  
200.             contactsDelBtn.setEnabled(true);  
201.         } else {  
202.             contactsDelBtn.setEnabled(false);  
203.         }  
204.     }  
205. }  

布局文件：contacts_delete_activity.xml

[html] view plaincopy

1. <?xml version="1.0" encoding="utf-8"?>  
2. <!--  
3.     [e-mail]  
4.     This layout of delete contacts.  
5. -->  
6. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
7.     android:layout_width="match_parent"  
8.     android:layout_height="match_parent"  
9.     android:orientation="vertical" >  
10.   
11.     <include  
12.         android:id="@+id/contacts_delete_list_header"  
13.         layout="@layout/contacts_delete_list_header" />  
14.   
15.     <ListView  
16.         android:id="@+id/contacts_delete_list"  
17.         android:layout_width="match_parent"  
18.         android:layout_height="0dip"  
19.         android:layout_weight="1" />  
20.   
21.     <LinearLayout  
22.         style="@android:style/ButtonBar"  
23.         android:layout_width="match_parent"  
24.         android:layout_height="wrap_content"  
25.         android:orientation="horizontal" >  
26.   
27.         <Button  
28.             android:id="@+id/contacts_delete_btn"  
29.             android:layout_width="0dip"  
30.             android:layout_height="wrap_content"  
31.             android:layout_weight="1"  
32.             android:enabled="false"  
33.             android:text="@string/delete" />  
34.   
35.         <Button  
36.             android:id="@+id/contacts_cancel_btn"  
37.             android:layout_width="0dip"  
38.             android:layout_height="wrap_content"  
39.             android:layout_weight="1"  
40.             android:text="@string/cancel" />  
41.     </LinearLayout>  
42.   
43. </LinearLayout>