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

/** * @author [e-mail]  * 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;}@Overridepublic 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);}@Overrideprotected 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IddelContactsIdSet = new HashSet<String>();for (int i = 0; i < cur.getCount(); i++) {selectedMap.put(i, false);}}@Overridepublic 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Idif (selectedMap.get(position)) {delContactsIdSet.add(String.valueOf(cur.getInt(CONTACTS_ID_INDEX)));} else {delContactsIdSet.remove(String.valueOf(cur.getInt(CONTACTS_ID_INDEX)));}return convertView;}@Overridepublic int getCount() {return cur.getCount();}@Overridepublic Object getItem(int position) {if (cur.moveToPosition(position)) {return cur;} else {return null;}}@Overridepublic long getItemId(int position) {return position;}}@Overridepublic 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() {@Overridepublic 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>() {@Overrideprotected 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;}@Overrideprotected 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;}}@Overridepublic 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"?><!--    [e-mail]    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>