Android中ListView结合CheckBox判断选中项

本文主要实现在自定义的ListView布局中加入CheckBox控件，通过判断用户是否选中CheckBox来对ListView的选中项进行相应的操作。通过一个Demo来展示该功能，选中ListView中的某一项，然后点击Button按钮来显示选中了哪些项。

[1] 程序结构图如下：

其中Person.java是实体类，MainActivity.java是Activity组件类。listitem.xml是自定义的列表每项布局文件。

[2] listitem.xml布局文件源码如下：

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayout
xmlns:Android="http://schemas.android.com/apk/res/android"
Android:orientation="vertical"
Android:layout_width="fill_parent"
Android:layout_height="fill_parent">
<LinearLayout
Android:layout_width="fill_parent"
Android:layout_height="wrap_content"
Android:orientation="horizontal"
Android:descendantFocusability="blocksDescendants">
<CheckBox
Android:id="@+id/list.select"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"/>
<TextView
Android:id="@+id/list.name"
Android:layout_width="fill_parent"
Android:layout_height="wrap_content"
Android:layout_weight="1"
Android:text="Name"
Android:layout_gravity="center"
Android:textSize="20dp"
Android:layout_marginLeft="10dp"/>
<TextView
Android:id="@+id/list.address"
Android:layout_width="fill_parent"
Android:layout_height="wrap_content"
Android:layout_weight="1"
Android:text="Address"
Android:layout_gravity="center"
Android:textSize="20dp"/>
</LinearLayout>
</LinearLayout>

[3] main.xml布局文件源码如下：

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:Android="http://schemas.android.com/apk/res/android"
Android:orientation="vertical"
Android:layout_width="fill_parent"
Android:layout_height="fill_parent">
<Button
Android:id="@+id/show"
Android:layout_width="fill_parent"
Android:layout_height="wrap_content"
Android:text="Show"/>
<ListView
Android:id="@+id/lvperson"
Android:layout_width="fill_parent"
Android:layout_height="fill_parent"/>
</LinearLayout>

[4] Person.java实体类源码如下：

packagecom.andyidea.bean;

publicclassPerson{

privateStringname;
privateStringaddress;

publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
publicStringgetAddress(){
returnaddress;
}
publicvoidsetAddress(Stringaddress){
this.address=address;
}

}

[5] MainActivity.java类源码如下：

packagecom.andyidea.listview;

importjava.util.ArrayList;
importjava.util.HashMap;
importjava.util.List;

importcom.andyidea.bean.Person;

importAndroid.app.Activity;
importAndroid.app.AlertDialog;
importAndroid.content.Context;
importAndroid.os.Bundle;
importAndroid.util.Log;
importAndroid.view.LayoutInflater;
importAndroid.view.View;
importAndroid.view.ViewGroup;
importAndroid.widget.BaseAdapter;
importAndroid.widget.Button;
importAndroid.widget.CheckBox;
importAndroid.widget.ListView;
importAndroid.widget.TextView;

publicclassMainActivityextendsActivity{

Buttonshow;
ListViewlv;
List<Person>persons=newArrayList<Person>();
ContextmContext;
MyListAdapteradapter;
List<Integer>listItemID=newArrayList<Integer>();

/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mContext=getApplicationContext();
show=(Button)findViewById(R.id.show);
lv=(ListView)findViewById(R.id.lvperson);

initPersonData();
adapter=newMyListAdapter(persons);
lv.setAdapter(adapter);

show.setOnClickListener(newView.OnClickListener(){

@Override
publicvoidonClick(Viewv){

listItemID.clear();
for(inti=0;i<adapter.mChecked.size();i++){
if(adapter.mChecked.get(i)){
listItemID.add(i);
}
}

if(listItemID.size()==0){
AlertDialog.Builderbuilder1=newAlertDialog.Builder(MainActivity.this);
builder1.setMessage("没有选中任何记录");
builder1.show();
}else{
StringBuildersb=newStringBuilder();

for(inti=0;i<listItemID.size();i++){
sb.append("ItemID="+listItemID.get(i)+".");
}
AlertDialog.Builderbuilder2=newAlertDialog.Builder(MainActivity.this);
builder2.setMessage(sb.toString());
builder2.show();
}
}
});
}

/**
*模拟数据
*/
privatevoidinitPersonData(){
PersonmPerson;
for(inti=1;i<=12;i++){
mPerson=newPerson();
mPerson.setName("Andy"+i);
mPerson.setAddress("GuangZhou"+i);
persons.add(mPerson);
}
}

//自定义ListView适配器
classMyListAdapterextendsBaseAdapter{
List<Boolean>mChecked;
List<Person>listPerson;
HashMap<Integer,View>map=newHashMap<Integer,View>();

publicMyListAdapter(List<Person>list){
listPerson=newArrayList<Person>();
listlistPerson=list;

mChecked=newArrayList<Boolean>();
for(inti=0;i<list.size();i++){
mChecked.add(false);
}
}

@Override
publicintgetCount(){
returnlistPerson.size();
}

@Override
publicObjectgetItem(intposition){
returnlistPerson.get(position);
}

@Override
publiclonggetItemId(intposition){
returnposition;
}

@Override
publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
Viewview;
ViewHolderholder=null;

if(map.get(position)==null){
Log.e("MainActivity","position1="+position);

LayoutInflatermInflater=(LayoutInflater)mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view=mInflater.inflate(R.layout.listitem,null);
holder=newViewHolder();
holder.selected=(CheckBox)view.findViewById(R.id.list_select);
holder.name=(TextView)view.findViewById(R.id.list_name);
holder.address=(TextView)view.findViewById(R.id.list_address);
finalintp=position;
map.put(position,view);
holder.selected.setOnClickListener(newView.OnClickListener(){

@Override
publicvoidonClick(Viewv){
CheckBoxcb=(CheckBox)v;
mChecked.set(p,cb.isChecked());
}
});
view.setTag(holder);
}else{
Log.e("MainActivity","position2="+position);
view=map.get(position);
holder=(ViewHolder)view.getTag();
}

holder.selected.setChecked(mChecked.get(position));
holder.name.setText(listPerson.get(position).getName());
holder.address.setText(listPerson.get(position).getAddress());

returnview;
}

}

staticclassViewHolder{
CheckBoxselected;
TextViewname;
TextViewaddress;
}
}

[6] 程序运行后的结果如下：