一、数据写死的新闻客户端(使用ListView、SmartImageView来实现) SmartImageView用来根据URL加载图片
activity_main.xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</RelativeLayout>
item.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.loopj.android.image.SmartImageView
android:id="@+id/image_view"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/textview_title"
android:layout_width="200dp"
android:layout_height="30dp"
android:layout_toRightOf="@+id/image_view"
android:singleLine="true"
android:text="标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题标题"
android:textColor="#000000"
android:textSize="18sp" />
<TextView
android:id="@+id/textview_content"
android:layout_width="200dp"
android:layout_height="40dp"
android:layout_below="@+id/textview_title"
android:layout_toRightOf="@+id/image_view"
android:text="内容内容内容内容内容内容内容内容内容内容内"
android:textColor="#999999"
android:textSize="14sp" />
<TextView
android:id="@+id/textview_typedesc"
android:layout_width="200dp"
android:layout_height="30dp"
android:layout_below="@+id/textview_content"
android:layout_marginLeft="150dp"
android:layout_toRightOf="@+id/image_view"
android:text="专题"
android:textColor="#ff0000"
android:textSize="14sp" />
</RelativeLayout>
package com.example.news;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.loopj.android.image.SmartImageView;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity {
private List<Map<String, String>> newsList = new ArrayList<Map<String, String>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化数据
initData();
// 找到ListView
ListView listView = (ListView) findViewById(R.id.list_view);
// 设置listView的适配器Adapter
listView.setAdapter(new NewsAdapter());
}
private void initData() {
Map<String, String> news1 = new HashMap<String, String>();
news1.put("title", "刘鹤将于5月15日应邀赴美就经贸问题进行磋商");
news1.put("content", "我与改革开放”故事今起征集 思想巨人 伟大旗帜");
news1.put("typeDesc", "专题");
newsList.add(news1);
Map<String, String> news2 = new HashMap<String, String>();
news2.put("title", "改革开放再出发");
news2.put("content", "外交部：朝鲜废弃核试验场有助半岛问题政治解决进程");
news2.put("typeDesc", "专题");
newsList.add(news2);
Map<String, String> news3 = new HashMap<String, String>();
news3.put("title", "降落全凭手动目视");
news3.put("content", "冲绳举行“回归日本”纪念大会 民众抗议驻日美军");
news3.put("typeDesc", "专题");
newsList.add(news3);
Map<String, String> news4 = new HashMap<String, String>();
news4.put("title", "中国地图 中国总部回应");
news4.put("content", "”微信小美女“是近6旬大妈 已成功诈骗几百名男子");
news4.put("typeDesc", "跟帖");
newsList.add(news4);
Map<String, String> news5 = new HashMap<String, String>();
news5.put("title", "技术无国界 联想最爱国");
news5.put("content", "外交部：朝鲜废弃核试验场有助半岛问题政治解决进程");
news5.put("typeDesc", "跟帖");
newsList.add(news5);
Map<String, String> news6 = new HashMap<String, String>();
news6.put("title", "火了的“严书记”是个误会？");
news6.put("content", "澳乡村屠杀案致7死 系孩子外祖父精心策划的谋杀");
news6.put("typeDesc", "跟帖");
newsList.add(news6);
}
private class NewsAdapter extends BaseAdapter {
@Override
public int getCount() {
return newsList.size();
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView == null) {
view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null);
} else {
view = convertView;
}
SmartImageView smartImageView = (SmartImageView) view.findViewById(R.id.image_view);
TextView titleTextView = (TextView) view.findViewById(R.id.textview_title);
TextView contentTextView = (TextView) view.findViewById(R.id.textview_content);
TextView typeDescTextView = (TextView) view.findViewById(R.id.textview_typedesc);
Map<String, String> news = newsList.get(position);
titleTextView.setText(news.get("title"));
contentTextView.setText(news.get("content"));
typeDescTextView.setText(news.get("typeDesc"));
smartImageView.setImageUrl("http://10.24.63.247:8080/tomcat.png");
return view;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
HttpUtils工具类：根据URL获取报文内容
/**
*
*/
package com.example.news;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
/**
* @author 13011705
*
*/
public class HttpUtils {
public static String getContentByUrl(String inputUrl) {
String content = "";
// 获取网络URL
URL url;
try {
url = new URL(inputUrl);
URLConnection conn = url.openConnection();
conn.setConnectTimeout(5000);
// 获取输入流
InputStream is = conn.getInputStream();
// 内存输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int temp;
while ((temp = is.read()) != -1) {
baos.write(temp);
}
content = baos.toString();
} catch (Exception e) {
e.printStackTrace();
}
return content;
}
}
二、从服务器获取数据开发新闻客户端（服务器获取数据、XML解析）
Activity：MainActivity
package com.example.news;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.loopj.android.image.SmartImageView;
public class MainActivity extends Activity {
List<NewData> newsList = new ArrayList<NewData>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化数据
initData1();
}
private void initData1() {
new Thread() {
@Override
public void run() {
String content = HttpUtils.getContentByUrl("http://10.24.63.247:8080/test.xml");
List<NewData> newDataList = XmlHelper.getInstance().getList(NewData.class, content, "newData");
for (NewData newData : newDataList) {
newsList.add(newData);
}
runOnUiThread(new Runnable() {
@Override
public void run() {
// 找到ListView
ListView listView = (ListView) findViewById(R.id.list_view);
// 设置listView的适配器Adapter
listView.setAdapter(new NewsAdapter());
}
});
}
}.start();
}
private class NewsAdapter extends BaseAdapter {
@Override
public int getCount() {
return newsList.size();
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView == null) {
view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null);
} else {
view = convertView;
}
SmartImageView smartImageView = (SmartImageView) view.findViewById(R.id.image_view);
TextView titleTextView = (TextView) view.findViewById(R.id.textview_title);
TextView contentTextView = (TextView) view.findViewById(R.id.textview_content);
TextView typeDescTextView = (TextView) view.findViewById(R.id.textview_typedesc);
NewData news = newsList.get(position);
titleTextView.setText(news.getTitle());
contentTextView.setText(news.getContent());
typeDescTextView.setText(news.getTypeDesc());
smartImageView.setImageUrl(news.getImgUrl());
return view;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
XmlHelper：XML解析工具类
/**
*
*/
package com.example.news;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* @author 13011705
*
*/
public class XmlHelper {
private static XmlHelper util;
public static XmlHelper getInstance() {
if (util == null) {
util = new XmlHelper();
}
return util;
}
private XmlHelper() {
super();
}
public <T> List<T> getList(Class<T> c, String str, String matchesNode) {
ByteArrayInputStream in = new ByteArrayInputStream(str.getBytes());
List<T> list = getList(c, in, matchesNode);
return list;
}
public <T> T getObject(Class<T> c, String str, String matchesNode) {
ByteArrayInputStream in = new ByteArrayInputStream(str.getBytes());
T obj = getObject(c, in, matchesNode);
return obj;
}
public <T> List<T> getList(Class<T> c, InputStream in, String matchesNode) {
XMLListHandle<T> handle = new XMLListHandle<T>(c, in, matchesNode);
List<T> list = handle.getList();
return list;
}
public <T> T getObject(Class<T> c, InputStream in, String matchesNode) {
XMLListHandle<T> handle = new XMLListHandle<T>(c, in, matchesNode);
T obj = (T) handle.getObject();
return obj;
}
private class XMLListHandle<T> extends DefaultHandler {
private T obj;
private Stack<String> stack = new Stack<String>();
private Class<T> c = null;
private Field[] fields = null;
private List<T> list = new ArrayList<T>();
private String matchesNode;
public XMLListHandle(Class<T> c, InputStream in, String matchesNode) {
this.matchesNode = matchesNode;
this.c = c;
this.fields = c.getDeclaredFields();
try {
this.obj = c.newInstance();
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
}
SAXParserFactory spf = SAXParserFactory.newInstance();
try {
SAXParser saxParser = spf.newSAXParser();
InputSource is = new InputSource(new InputStreamReader(in, "UTF-8"));
saxParser.parse(is, this);
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void startElement(String namespaceURI, String localName, String qName, Attributes attr)
throws SAXException {
stack.push(qName);
try {
if (qName.equalsIgnoreCase(matchesNode)) {
this.obj = c.newInstance();
}
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
}
for (int i = 0; i < attr.getLength(); i++) {
for (Field field : fields) {
String aQName = attr.getQName(i);
String aLName = attr.getLocalName(i);
String fName = field.getName();
if (fName.equalsIgnoreCase(aQName) || fName.equalsIgnoreCase(aLName)) {
try {
field.setAccessible(true);
if (obj != null) {
field.set(obj, attr.getValue(aQName));
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
@Override
public void characters(char[] ch, int start, int end) throws SAXException {
String tag = stack.peek();
for (Field field : fields) {
if (tag.equalsIgnoreCase(field.getName())) {
String string = new String(ch, start, end);
try {
field.setAccessible(true);
if (obj != null) {
field.set(obj, string);
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
}
@Override
public void endElement(String uri, String localName, String name) throws SAXException {
String tag = stack.peek();
if (tag.equalsIgnoreCase(matchesNode) && obj != null) {
list.add(obj);
}
stack.pop();
}
public List<T> getList() {
return list;
}
public T getObject() {
return obj;
}
}
}
实体Bean：NewData
/**
*
*/
package com.example.news;
/**
* @author 13011705
*
*/
public class NewData {
private String title;
private String content;
private String typeDesc;
private String imgUrl;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getTypeDesc() {
return typeDesc;
}
public void setTypeDesc(String typeDesc) {
this.typeDesc = typeDesc;
}
public String getImgUrl() {
return imgUrl;
}
public void setImgUrl(String imgUrl) {
this.imgUrl = imgUrl;
}
}