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

/** * @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);		}	}}

<?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>