http://blog.csdn.net/kkfdsa132/article/details/6327482
在开发中,我们经常使用到ListView这个控件。Android的API也提供了许多创建ListView适配器的快捷方式。例如ArrayAdapter、SimpleAdapter和SimpleCursorAdapter等。但你是否发现,如果采用这些系统自带的适配器,对于事件的响应只能局限在一个行单位。假设一行里面有一个按钮和一个图片控件,它们之间的响应操作是不一样的。若采用系统自带的适配器,就不能精确到每个控件的响应事件。这时,我们一般采取自定义适配器来实现这个比较精确地请求。
ListView的创建,一般要具备两大元素:
1)数据集,即要映射的字符串、图片信息之类。
2)适配器,实现把要映射的字符串、图片信息映射成视图(如Textview、Image等组件),再添加到ListView中。
下面是一个实操例子:
实现细节:
1、创建数据集,一般定义如下
private List<Map<String, Object>> listItems;
元素添加方式:
Map<String, Object> map = new HashMap<String, Object>();
map.put("image", imgeIDs[i]); //图片资源
map.put("title", "物品名称:"); //物品标题
map.put("info", goodsNames[i]); //物品名称
map.put("detail", goodsDetails[i]); //物品详情
listItems.add(map); //添加一项
2、创建适配器
public class ListViewAdapter extends BaseAdapter{........} //自定义的适配器一般继承BaseAdapter类
listViewAdapter = new ListViewAdapter(this, listItems);
3、给ListView设置适配器
listView.setAdapter(listViewAdapter);
4、这里还有个关键点,如何把list_item.xml布局作为一个视图,添加到listView中:
LayoutInflater listContainer; //视图容器工厂
listContainer = LayoutInflater.from(context); //创建视图容器工厂并设置上下文
convertView = listContainer.inflate(R.layout.list_item, null); //创建list_item.xml布局文件的视图
实例视图如下:
1)布局文件main.xml
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- <?xml version="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:gravity="center_horizontal"
- android:orientation="horizontal" android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- <TextView android:text="结算: "
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textColor="#FFFFFFFF"
- android:textSize="20px"/>
- <ImageButton android:id="@+id/imgbt_sum"
- android:layout_width="40px"
- android:layout_height="40px"
- android:background = "@drawable/shopping" />
- </LinearLayout>
-
- <TextView android:text="商品列表: "
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textColor="#FFFFFFFF" />
-
-
- <ListView android:id="@+id/list_goods"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content" />
-
- </LinearLayout>
<?xml version="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"> <!-- 结算 --><LinearLayout android:gravity="center_horizontal"android:orientation="horizontal" android:layout_width="fill_parent"android:layout_height="wrap_content"><TextView android:text="结算: "android:layout_width="wrap_content"android:layout_height="wrap_content" android:textColor="#FFFFFFFF" android:textSize="20px"/><ImageButton android:id="@+id/imgbt_sum" android:layout_width="40px"android:layout_height="40px"android:background = "@drawable/shopping" /></LinearLayout><TextView android:text="商品列表: "android:layout_width="wrap_content"android:layout_height="wrap_content" android:textColor="#FFFFFFFF" /><!-- 商品列表 --><ListView android:id="@+id/list_goods" android:layout_width="fill_parent"android:layout_height="wrap_content" /></LinearLayout>
列表项布局文件list_item.xml
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- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="horizontal" android:layout_width="fill_parent"
- android:layout_height="fill_parent">
-
-
- <ImageView android:id="@+id/imageItem"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_margin="5px"/>
-
-
- <LinearLayout android:orientation="vertical"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content">
-
- <TextView android:id="@+id/titleItem"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textColor="#FFFFFFFF"
- android:textSize="13px" />
- <TextView android:id="@+id/infoItem"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textColor="#FFFFFFFF"
- android:textSize="22px" />
- </LinearLayout>
-
-
- <LinearLayout android:gravity="right"
- android:orientation="horizontal" android:layout_width="fill_parent"
- android:layout_height="wrap_content">
- <CheckBox android:id="@+id/checkItem"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_margin="5px"/>
- <Button android:id="@+id/detailItem"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_margin="5px"/>
- </LinearLayout>
- </LinearLayout>
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal" android:layout_width="fill_parent"android:layout_height="fill_parent"><!-- 商品图片 --><ImageView android:id="@+id/imageItem" android:layout_width="wrap_content"android:layout_height="wrap_content" android:layout_margin="5px"/><!-- 商品信息 --><LinearLayout android:orientation="vertical"android:layout_width="wrap_content" android:layout_height="wrap_content"><TextView android:id="@+id/titleItem" android:layout_width="wrap_content"android:layout_height="wrap_content" android:textColor="#FFFFFFFF"android:textSize="13px" /><TextView android:id="@+id/infoItem" android:layout_width="wrap_content"android:layout_height="wrap_content" android:textColor="#FFFFFFFF"android:textSize="22px" /></LinearLayout><!-- 购买和商品详情 --><LinearLayout android:gravity="right"android:orientation="horizontal" android:layout_width="fill_parent"android:layout_height="wrap_content"><CheckBox android:id="@+id/checkItem" android:layout_width="wrap_content"android:layout_height="wrap_content" android:layout_margin="5px"/><Button android:id="@+id/detailItem" android:layout_width="wrap_content"android:layout_height="wrap_content" android:layout_margin="5px"/></LinearLayout></LinearLayout>
2)代码,主代码:
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- package com.myandroid.test;
-
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
-
- import android.app.Activity;
- import android.app.AlertDialog;
- import android.content.DialogInterface;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.ArrayAdapter;
- import android.widget.ImageButton;
- import android.widget.ListView;
-
- public class MyListView extends Activity {
-
- private ListView listView;
- private ImageButton imgbt_sum;
- private ListViewAdapter listViewAdapter;
- private List<Map<String, Object>> listItems;
- private Integer[] imgeIDs = {R.drawable.cake,
- R.drawable.gift, R.drawable.letter,
- R.drawable.love, R.drawable.mouse,
- R.drawable.music};
- private String[] goodsNames = {"蛋糕", "礼物",
- "邮票", "爱心", "鼠标", "音乐CD"};
- private String[] goodsDetails = {
- "蛋糕:好好吃。",
- "礼物:礼轻情重。",
- "邮票:环游世界。",
- "爱心:世界都有爱。",
- "鼠标:反应敏捷。",
- "音乐CD:酷我音乐。"};
-
-
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
-
- listView = (ListView)findViewById(R.id.list_goods);
- imgbt_sum = (ImageButton) findViewById(R.id.imgbt_sum);
- imgbt_sum.setOnClickListener(new ClickEvent());
- listItems = getListItems();
- listViewAdapter = new ListViewAdapter(this, listItems);
- listView.setAdapter(listViewAdapter);
- }
-
-
-
-
- private List<Map<String, Object>> getListItems() {
- List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();
- for(int i = 0; i < goodsNames.length; i++) {
- Map<String, Object> map = new HashMap<String, Object>();
- map.put("image", imgeIDs[i]);
- map.put("title", "物品名称:");
- map.put("info", goodsNames[i]);
- map.put("detail", goodsDetails[i]);
- listItems.add(map);
- }
- return listItems;
- }
-
- class ClickEvent implements OnClickListener{
-
- @Override
- public void onClick(View v) {
-
- String goodsList = "";
- for(int i = 0; i < listItems.size(); i++) {
- goodsList += listViewAdapter.hasChecked(i)? goodsNames[i] + " ": "";
- }
- new AlertDialog.Builder(MyListView.this)
- .setTitle("购物清单:")
- .setMessage("你好,你选择了如下商品:/n" + goodsList)
- .setPositiveButton("确定", null)
- .show();
- }
-
- }
- }
package com.myandroid.test;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.ArrayAdapter;import android.widget.ImageButton;import android.widget.ListView;public class MyListView extends Activity {private ListView listView;private ImageButton imgbt_sum;private ListViewAdapter listViewAdapter;private List<Map<String, Object>> listItems;private Integer[] imgeIDs = {R.drawable.cake, R.drawable.gift, R.drawable.letter,R.drawable.love, R.drawable.mouse,R.drawable.music};private String[] goodsNames = {"蛋糕", "礼物", "邮票", "爱心", "鼠标", "音乐CD"};private String[] goodsDetails = {"蛋糕:好好吃。", "礼物:礼轻情重。", "邮票:环游世界。", "爱心:世界都有爱。","鼠标:反应敏捷。","音乐CD:酷我音乐。"}; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); listView = (ListView)findViewById(R.id.list_goods); imgbt_sum = (ImageButton) findViewById(R.id.imgbt_sum); imgbt_sum.setOnClickListener(new ClickEvent()); listItems = getListItems(); listViewAdapter = new ListViewAdapter(this, listItems); //创建适配器 listView.setAdapter(listViewAdapter); } /** * 初始化商品信息 */ private List<Map<String, Object>> getListItems() { List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>(); for(int i = 0; i < goodsNames.length; i++) { Map<String, Object> map = new HashMap<String, Object>(); map.put("image", imgeIDs[i]); //图片资源 map.put("title", "物品名称:"); //物品标题 map.put("info", goodsNames[i]); //物品名称 map.put("detail", goodsDetails[i]); //物品详情 listItems.add(map); } return listItems; } class ClickEvent implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString goodsList = "";for(int i = 0; i < listItems.size(); i++) {goodsList += listViewAdapter.hasChecked(i)? goodsNames[i] + " ": "";}new AlertDialog.Builder(MyListView.this).setTitle("购物清单:").setMessage("你好,你选择了如下商品:/n" + goodsList).setPositiveButton("确定", null).show();} }}
适配器代码: