android 基于ListView和CheckBox实现多选和全选记录的功能(转)

[原]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代码   /**   * @author zuolongsnail@163.com    * MultiSelectActivity   */   public class MultiSelectActivity extends Activity implements OnClickListener,           OnItemClickListener {       private static final String TAG = "MultiSelectActivity";       private ListView contactsDelList;       private Button contactsDelBtn;       private Button contactsCancelBtn;       private CheckBox selectAll;       private Cursor cursor;       private ContactsDeleteAdapter contactsDeleteAdapter;          private static final String[] PROJECTION = new String[] { Contacts._ID,               Contacts.DISPLAY_NAME };       private static final int CONTACTS_ID_INDEX = 0;       private static final int DISPLAY_NAME_INDEX = 1;       private ContactsDeleteListItemViews holderViews;          private final class ContactsDeleteListItemViews {           TextView nameView;           CheckBox delCheckBox;       }          @Override       public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.contacts_delete_activity);           contactsDelList = (ListView) findViewById(R.id.contacts_delete_list);           contactsDelBtn = (Button) findViewById(R.id.contacts_delete_btn);           contactsCancelBtn = (Button) findViewById(R.id.contacts_cancel_btn);           selectAll = (CheckBox) (findViewById(R.id.contacts_delete_list_header)                   .findViewById(R.id.select_all));           contactsDelList.setOnItemClickListener(this);           contactsDelBtn.setOnClickListener(this);           contactsCancelBtn.setOnClickListener(this);           selectAll.setOnClickListener(this);       }          @Override       protected void onResume() {           super.onResume();           refreshData();       }          // 查询数据库       private void refreshData() {           cursor = getContentResolver().query(Contacts.CONTENT_URI, PROJECTION,                   null, null, null);           contactsDeleteAdapter = new ContactsDeleteAdapter(this, cursor);           contactsDelList.setAdapter(contactsDeleteAdapter);       }          class ContactsDeleteAdapter extends BaseAdapter {           Cursor cur;           Map<Integer, Boolean> selectedMap;           HashSet<String> delContactsIdSet;              public ContactsDeleteAdapter(Context context, Cursor c) {               cur = c;               // 保存每条记录是否被选中的状态               selectedMap = new HashMap<Integer, Boolean>();               // 保存被选中记录作数据库表中的Id               delContactsIdSet = new HashSet<String>();                  for (int i = 0; i < cur.getCount(); i++) {                   selectedMap.put(i, false);               }           }              @Override           public View getView(int position, View convertView, ViewGroup parent) {               if (convertView == null) {                   convertView = LayoutInflater.from(MultiSelectActivity.this)                           .inflate(R.layout.contacts_delete_list_item, null);                   holderViews = new ContactsDeleteListItemViews();                   holderViews.nameView = (TextView) convertView                           .findViewById(R.id.name);                   holderViews.delCheckBox = (CheckBox) convertView                           .findViewById(R.id.delete_list_item);                   convertView.setTag(holderViews);               }               cur.moveToPosition(position);               ContactsDeleteListItemViews views = (ContactsDeleteListItemViews) convertView                       .getTag();               final String name = cur.getString(DISPLAY_NAME_INDEX);               views.nameView.setText(name);               views.delCheckBox.setChecked(selectedMap.get(position));               // 保存记录Id               if (selectedMap.get(position)) {                   delContactsIdSet.add(String.valueOf(cur                           .getInt(CONTACTS_ID_INDEX)));               } else {                   delContactsIdSet.remove(String.valueOf(cur                           .getInt(CONTACTS_ID_INDEX)));               }               return convertView;           }              @Override           public int getCount() {               return cur.getCount();           }              @Override           public Object getItem(int position) {               if (cur.moveToPosition(position)) {                   return cur;               } else {                   return null;               }           }              @Override           public long getItemId(int position) {               return position;           }       }          @Override       public void onClick(View v) {           switch (v.getId()) {           case R.id.select_all:               // 全选CheckBox的click事件处理               if (selectAll.isChecked()) {                   for (int i = 0; i < contactsDeleteAdapter.getCount(); i++) {                       contactsDeleteAdapter.selectedMap.put(i, true);                       //click事件：全选checkbox被勾选则把所有的联系人ID添加到delContactsIdSet中                       contactsDeleteAdapter.cur.moveToPosition(i);                       contactsDeleteAdapter.delContactsIdSet.add(String                               .valueOf(contactsDeleteAdapter.cur                                       .getInt(CONTACTS_ID_INDEX)));                   }                   contactsDelBtn.setEnabled(true);               } else {                   for (int i = 0; i < contactsDeleteAdapter.getCount(); i++) {                       contactsDeleteAdapter.selectedMap.put(i, false);                   }                   //click事件：全选checkbox被取消勾选则把delContactsIdSet清空                   contactsDeleteAdapter.delContactsIdSet.clear();                   contactsDelBtn.setEnabled(false);               }               contactsDeleteAdapter.notifyDataSetChanged();               break;           case R.id.contacts_delete_btn:               new AlertDialog.Builder(this).setTitle(                       R.string.clearConfirmation_title).setMessage(                       R.string.clearConfirmation).setNegativeButton(                       android.R.string.cancel, null).setPositiveButton(                       android.R.string.ok, new DialogInterface.OnClickListener() {                           @Override                           public void onClick(DialogInterface dialog, int which) {                               final ProgressDialog progressDialog = ProgressDialog                                       .show(                                               MultiSelectActivity.this,                                               getString(R.string.clearProgress_title),                                               "", true, false);                               final AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {                                   @Override                                   protected Void doInBackground(Void... params) {                                       // 删除记录事件处理（我这里就不写详细的代码了）                                       return null;                                   }                                      @Override                                   protected void onPostExecute(Void result) {                                       progressDialog.dismiss();                                   }                               };                               progressDialog.show();                               task.execute();                           }                       }).setCancelable(true).create().show();               break;           case R.id.contacts_cancel_btn:               // 取消事件处理               break;           }       }          @Override       public void onItemClick(AdapterView<?> arg0, View view, int position,               long id) {           Log.i(TAG, "onItemClick");           ContactsDeleteListItemViews views = (ContactsDeleteListItemViews) view                   .getTag();           views.delCheckBox.toggle();           contactsDeleteAdapter.selectedMap.put(position, views.delCheckBox                   .isChecked());           contactsDeleteAdapter.notifyDataSetChanged();           // 判断是否有记录没被选中，以便修改全选CheckBox勾选状态           if (contactsDeleteAdapter.selectedMap.containsValue(false)) {               selectAll.setChecked(false);           } else {               selectAll.setChecked(true);           }           // 判断是否有记录被选中，以便设置删除按钮是否可用           if (contactsDeleteAdapter.selectedMap.containsValue(true)) {               contactsDelBtn.setEnabled(true);           } else {               contactsDelBtn.setEnabled(false);           }       }   }   布局文件：contacts_delete_activity.xml Html代码   <?xml version="1.0" encoding="utf-8"?>   <!--       zuolongsnail@163.com       This layout of delete contacts.   -->   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"       android:layout_width="match_parent"       android:layout_height="match_parent"       android:orientation="vertical" >          <include           android:id="@+id/contacts_delete_list_header"           layout="@layout/contacts_delete_list_header" />          <ListView           android:id="@+id/contacts_delete_list"           android:layout_width="match_parent"           android:layout_height="0dip"           android:layout_weight="1" />          <LinearLayout           style="@android:style/ButtonBar"           android:layout_width="match_parent"           android:layout_height="wrap_content"           android:orientation="horizontal" >              <Button               android:id="@+id/contacts_delete_btn"               android:layout_width="0dip"               android:layout_height="wrap_content"               android:layout_weight="1"               android:enabled="false"               android:text="@string/delete" />              <Button               android:id="@+id/contacts_cancel_btn"               android:layout_width="0dip"               android:layout_height="wrap_content"               android:layout_weight="1"               android:text="@string/cancel" />       </LinearLayout>      </LinearLayout>       作者：zuolongsnail 发表于2011-12-8 10:17:39  原文链接