android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.

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

<?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>

代码下载地址：源码下载

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