android listview checkbox 记录,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 selectedmap;

hashset 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();

// 保存被选中记录作数据库表中的id

delcontactsidset = new hashset();

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 task = new asynctask() {

@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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:id="@+id/contacts_delete_list_header"

layout="@layout/contacts_delete_list_header" />

android:id="@+id/contacts_delete_list"

android:layout_width="match_parent"

android:layout_height="0dip"

android:layout_weight="1" />

style="@android:style/buttonbar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal" >

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" />

android:id="@+id/contacts_cancel_btn"

android:layout_width="0dip"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="@string/cancel" />

代码下载地址：源码下载

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