2. 代码
MainActivity
package com.himi;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
public class MainActivity extends Activity {
private SimpleAdapter adapter;// 声明适配器对象
private ListView listView; // 声明列表视图对象
private List < Map < String , Object >> list;// 声明列表容器
public static MainActivity ma;
@ Override
public void onCreate ( Bundle savedInstanceState ) {
super.onCreate ( savedInstanceState );
ma = this;
// 实例化列表容器
list = new ArrayList < Map < String , Object >> ( );
listView = new ListView ( this );// 实例化列表视图
// 实例一个列表数据容器
Map < String , Object > map = new HashMap < String , Object > ( );
// 往列表容器中添加数据
map.put ( "item1_imageivew" , R.drawable.icon );
map.put ( "item1_bigtv" , "BIGTV" );
map.put ( "item1_smalltv" , "SMALLTV" );
// 将列表数据添加到列表容器中
list.add ( map );
// 使用Android 提供的SimpleAdapter适配器,无法实现组件监听；
// adapter = new SimpleAdapter(this, list, R.layout.main,
// new String[] {"item1_imageivew", "item1_bigtv", "item1_smalltv" },
// new int[] {R.id.iv, R.id.bigtv, R.id.smalltv });
// --使用自定义适配器，可监听其ListView中每一项的事件监听
MySimpleAdapter adapter = new MySimpleAdapter (
this ,
list ,
R.layout.main ,
new String [ ]
{
"item1_imageivew" ,
"item1_bigtv" ,
"item1_smalltv"
} ,
new int [ ]
{
R.id.iv ,
R.id.bigtv ,
R.id.smalltv
} );
// 为列表视图设置适配器（将数据映射到列表视图中）
listView.setAdapter ( adapter );
listView.setOnItemClickListener ( new OnItemClickListener ( ) {
@ Override
public void onItemClick ( AdapterView < ? > parent ,
View view ,
int position ,
long id ) {
// TODO Auto-generated method stub
Toast.makeText ( MainActivity.this ,
"你点击的是第："
+ position
+ "项" ,
Toast.LENGTH_SHORT )
.show ( );
}
} );
// //显示列表视图
this.setContentView ( listView );
}
}
MySimpleAdapter
package com.himi;
import java.util.List;
import java.util.Map;
import android.app.AlertDialog;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.CompoundButton.OnCheckedChangeListener;
public class MySimpleAdapter extends BaseAdapter {
//声明一个LayoutInflater对象（其作用是用来实例化布局）
private LayoutInflater mInflater;
private List < Map < String , Object >> list;//声明List容器对象
private int layoutID; //声明布局ID
private String flag[];//声明ListView项中所有组件映射索引
private int ItemIDs[];//声明ListView项中所有组件ID数组
public MySimpleAdapter (
Context context ,
List < Map < String , Object >> list ,
int layoutID , String flag[] , int ItemIDs[] ) {
//利用构造来实例化成员变量对象
this.mInflater = LayoutInflater.from ( context );
this.list = list;
this.layoutID = layoutID;
this.flag = flag;
this.ItemIDs = ItemIDs;
}
@ Override
public int getCount ( ) {
return list.size ( );//返回ListView项的长度
}
@ Override
public Object getItem ( int arg0 ) {
return 0;
}
@ Override
public long getItemId ( int arg0 ) {
return 0;
}
//实例化布局与组件以及设置组件数据
//getView(int position, View convertView, ViewGroup parent)
//第一个参数：绘制的行数
//第二个参数：绘制的视图这里指的是ListView中每一项的布局
//第三个参数：view的合集，这里不需要
@ Override
public View getView ( int position , View convertView ,
ViewGroup parent ) {
//将布局通过mInflater对象实例化为一个view
convertView = mInflater.inflate ( layoutID , null );
for ( int i = 0 ; i < flag.length ; i ++ ) {//遍历每一项的所有组件
//每个组件都做匹配判断，得到组件的正确类型
if (convertView.findViewById ( ItemIDs [ i ] ) instanceof ImageView) {
//findViewById()函数作用是实例化布局中的组件
//当组件为ImageView类型，则为其实例化一个ImageView对象
ImageView iv = ( ImageView ) convertView
.findViewById ( ItemIDs [ i ] );
//为其组件设置数据
iv.setBackgroundResource ( ( Integer ) list
.get ( position )
.get ( flag [ i ] ) );
}
else if (convertView.findViewById ( ItemIDs [ i ] ) instanceof TextView) {
//当组件为TextView类型，则为其实例化一个TextView对象
TextView tv = ( TextView ) convertView
.findViewById ( ItemIDs [ i ] );
//为其组件设置数据
tv.setText ( ( String ) list.get (
position )
.get ( flag [ i ] ) );
}
}
//为按钮设置监听
( ( Button ) convertView.findViewById ( R.id.btn ) )
.setOnClickListener ( new View.OnClickListener ( ) {
@ Override
public void onClick ( View v ) {
//这里弹出一个对话框，后文有详细讲述
new AlertDialog.Builder (
MainActivity.ma )
.setTitle ( "自定义SimpleAdapter" )
.setMessage ( "按钮成功触发监听事件！" )
.show ( );
}
} );
//为复选框设置监听
( ( CheckBox ) convertView.findViewById ( R.id.cb ) )
.setOnCheckedChangeListener ( new OnCheckedChangeListener ( ) {
@ Override
public void onCheckedChanged (
CompoundButton buttonView ,
boolean isChecked ) {
//这里弹出一个对话框，后文有详细讲述
new AlertDialog.Builder (
MainActivity.ma )
.setTitle ( "自定义SimpleAdapter" )
.setMessage ( "CheckBox成功触发状态改变监听事件！" )
.show ( );
}
} );
return convertView;
}
}
Layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<ImageView
android:id="@+id/iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/bigtv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp" />
<TextView
android:id="@+id/smalltv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10sp" />
</LinearLayout>
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:text="button" />
<CheckBox
android:id="@+id/cb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false" />
</LinearLayout>
时间： 2024-11-03 22:04:17