android基於ListView和CheckBox實現多選和全選記錄的功能

應用開發中經常會有從數據庫中讀取數據顯示，然後選中多條、全部記錄並且刪除的需求。在做定制系統聯系人的時候也遇到這樣的需求，下面寫個簡單的通過ListView和CheckBox實現多選、全選的例子。下面是具體的代碼.

效果如下：

MultiSelectActivity

/** 
 * 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(); 
  } 
 
  // 查詢數據庫 
  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; 
      // 保存每條記錄是否被選中的狀態 
      selectedMap = new HashMap<Integer, Boolean>(); 
      // 保存被選中記錄作數據庫表中的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)); 
      // 保存記錄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: 
      // 全選CheckBox的click事件處理 
      if (selectAll.isChecked()) { 
        for (int i = 0; i < contactsDeleteAdapter.getCount(); i++) { 
          contactsDeleteAdapter.selectedMap.put(i, true); 
          //click事件：全選checkbox被勾選則把所有的聯系人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：全選checkbox被取消勾選則把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) { 
                  // 刪除記錄事件處理（我這裡就不寫詳細的代碼了） 
                  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: 
      // 取消事件處理 
      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(); 
    // 判斷是否有記錄沒被選中，以便修改全選CheckBox勾選狀態 
    if (contactsDeleteAdapter.selectedMap.containsValue(false)) { 
      selectAll.setChecked(false); 
    } else { 
      selectAll.setChecked(true); 
    } 
    // 判斷是否有記錄被選中，以便設置刪除按鈕是否可用 
    if (contactsDeleteAdapter.selectedMap.containsValue(true)) { 
      contactsDelBtn.setEnabled(true); 
    } else { 
      contactsDelBtn.setEnabled(false); 
    } 
  } 
} 

布局文件：contacts_delete_activity.xml

<?xml version="1.0" encoding="utf-8"?> 
<!-- 
  [email protected] 
  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 
     
    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> 

代碼下載地址：源碼下載

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