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"?> 
<!-- 
  [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> 

代码下载地址：源码下载

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