ListView通过自定义适配器来显示数据并对Item项以及子view项的控件实现监听.

本篇主要功能.

通过xml pull解析得到数据,然后通过自定义的Adapter绑定数据源,ListView绑定适配器,并且实现Item项的点击事件以及子View控件的点击事件.

一.实体类.

Book.java

[java] view plaincopy

package cn.skychi.news;
/**
* @package : cn.skychi.news
* @description: 实体类.
* @author : qc
* @version : v1.0
* @date : 2012-11-29 下午2:45:49
*/
public class Book
{
private int id;
private String name;
private float price;
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public float getPrice()
{
return price;
}
public void setPrice(float price)
{
this.price = price;
}
@Override
public String toString()
{
return this.id + ":" + this.name + ":" + this.price;
}
}

二.xmlPull解析.

[java] view plaincopy

package cn.skychi.parser;
/**
* @package : cn.skychi.parser
* @description:
* @author : qc
* @version : v1.0
* @date : 2012-11-29 下午2:49:00
*/
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import cn.skychi.news.Book;
import android.content.Context;
import android.util.Log;
import android.util.Xml;
public class PullParseService
{
public static List<Book> getBooks(Context context) throws Exception
{
List<Book> books = null;
Book book = null;
InputStream inputStream = context.getResources().getAssets()
.open("book.xml");
XmlPullParser parser = Xml.newPullParser();
parser.setInput(inputStream, "UTF-8");
int event = parser.getEventType();// 产生第一个事件
while (event != XmlPullParser.END_DOCUMENT)
{
switch (event)
{
case XmlPullParser.START_DOCUMENT:// 判断当前事件是否是文档开始事件
books = new ArrayList<Book>();// 初始化books集合
break;
case XmlPullParser.START_TAG:// 判断当前事件是否是标签元素开始事件
if ("book".equals(parser.getName()))
{// 判断开始标签元素是否是book
book = new Book();
book.setId(Integer.parseInt(parser.getAttributeValue(0)));// 得到book标签的属性值，并设置book的id
}
if (book != null)
{
if ("name".equals(parser.getName()))
{// 判断开始标签元素是否是name
book.setName(parser.nextText());
}
else if ("price".equals(parser.getName()))
{// 判断开始标签元素是否是price
book.setPrice(Float.parseFloat(parser.nextText()));
}
Log.d("TAG", "" + book.toString());
}
break;
case XmlPullParser.END_TAG:// 判断当前事件是否是标签元素结束事件
if ("book".equals(parser.getName()))
{// 判断结束标签元素是否是book
books.add(book);// 将book添加到books集合
book = null;
}
break;
}
event = parser.next();// 进入下一个元素并触发相应事件
}// end while
return books;
}
}

三.MainActivity

[java] view plaincopy

package cn.skychi;
import java.util.ArrayList;
import java.util.List;
import cn.skychi.news.Book;
import cn.skychi.news.NewsInfo;
import cn.skychi.parser.NewsPullParser;
import cn.skychi.parser.PullParseService;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity
{
private ListView newsListView;
private ArrayList<NewsInfo> newsInfoList;
private List<Book> bookList;
private MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
newsListView = (ListView) findViewById(R.id.listView);
try
{
bookList = PullParseService.getBooks(this);
}
catch(Exception e)
{
e.printStackTrace();
}
adapter = new MyAdapter(this, bookList);
newsListView.setAdapter(adapter);
newsListView
.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id)
{
Toast.makeText(
MainActivity.this,
"position = " + position + "\n" + "第" + id
+ "行", 3000).show();
}
});
}
private class MyAdapter extends BaseAdapter
{
private Context context;
private List<Book> book;
private LayoutInflater inflater;
public MyAdapter(Context context, List<Book> book)
{
super();
this.context = context;
this.book = book;
inflater = LayoutInflater.from(context);
}
class ViewHolder
{
ImageView picture;
TextView name;
TextView price;
ImageButton arrowPicture;
}
@Override
public Object getItem(int position)
{
return book.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent)
{
ViewHolder holder = new ViewHolder();
if (convertView == null)
{
convertView = inflater.inflate(R.layout.news_item, null);
holder.picture = (ImageView) convertView
.findViewById(R.id.newsImage);
convertView.setTag(holder);
holder.name = (TextView) convertView
.findViewById(R.id.newsTitle);
holder.price = (TextView) convertView
.findViewById(R.id.newsDate);
holder.arrowPicture = (ImageButton) convertView
.findViewById(R.id.menuSend);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(book.get(position).getName());
holder.price.setText(String.valueOf(book.get(position).getPrice()));
holder.arrowPicture
.setImageResource(android.R.drawable.ic_menu_more);
holder.picture.setImageResource(R.drawable.ic_launcher);
holder.arrowPicture.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
showDetailDialog(book, position);
}
});
return convertView;
}
@Override
public int getCount()
{
return book.size();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is
// present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void showDetailDialog(List<Book> book, int position)
{
if (book != null && position >= 0)
{
new AlertDialog.Builder(MainActivity.this)
.setTitle("详细信息")
.setMessage(
"Name :" + "\n" + book.get(position).getName()
+ "\n\n" + "Price :" + "\n"
+ +book.get(position).getPrice() + "\n")
.setPositiveButton("ok",
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog,
int which)
{
dialog.cancel();
}
}).show();
}
}
}

[java] view plaincopy

<pre name="code" class="html"><?xml version="1.0" encoding="UTF-8"?>
<books>
<book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book>
<book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book><book id="12">
<name>thinking in java</name>
<price>85.5</price>
</book>
<book id="15">
<name>Spring in Action</name>
<price>39.0</price>
</book>
</books>
</pre><pre name="code" class="java"></pre><pre name="code" class="java"></pre><pre name="code" class="java"></pre><pre name="code" class="java"></pre><pre name="code" class="java"><pre></pre>五.布局文件:
activity_main.xml
<pre name="code" class="java"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity" >
<ListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
</ListView>
</RelativeLayout></pre>
news_item.xml
<pre name="code" class="java"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/newsInfoLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:descendantFocusability="blocksDescendants" >
<TextView
android:id="@+id/newsTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/newsImage"
android:layout_marginLeft="20dp"
android:layout_toLeftOf="@+id/menuSend"
android:layout_toRightOf="@+id/newsImage"
android:ellipsize="middle"
android:singleLine="true"
android:text="TextView" />
<!--
<TextView
android:id="@+id/newsContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/newsDate"
android:layout_alignLeft="@+id/newsTitle"
android:layout_below="@+id/newsTitle"
android:layout_toLeftOf="@+id/menuSend"
android:visibility="gone" />
-->
<TextView
android:id="@+id/newsDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/newsImage"
android:layout_marginLeft="20dp"
android:layout_toLeftOf="@+id/menuSend"
android:layout_toRightOf="@+id/newsImage"
android:singleLine="true"
android:text="TextView" />
<ImageView
android:id="@+id/newsImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="30dp"
android:src="@drawable/ic_launcher" />
<ImageButton
android:id="@+id/menuSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="19dp"
android:background="#ff00ff"
android:clickable="false"
android:focusable="false"
android:src="@android:drawable/ic_menu_more" />
</RelativeLayout></pre>
说明:在实现listview item 项以及View控件的监听时要在news_item.xml 中进行配置.即:
android:descendantFocusability="blocksDescendants" 以及android:clickable="false"android:focusable="false"
否则,item 点击事件不会执行.
<pre></pre>
<pre></pre>
<pre></pre>
</pre>

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