基于ListView和CheckBox实现多选和全选记录的功能

http://blog.csdn.net/zuolongsnail/article/details/7051620

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

/**
 * @author [email protected]
 * 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"?>
<!--
    [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
        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>