Android仿网易客户端新闻案例
学到知识：
1.消息处理机制：Handler
2.JavaBean结合集合运用
3.解析服务器端xml的内容
4.Adapter适配
Activity
import com.itheima28.neteasedemo.domain.NewInfo;
import com.loopj.android.image.SmartImageView;
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
private final int SUCCESS = 0;
private final int FAILED = 1;
private ListView lvNews;
private List<NewInfo> newInfoList;
private Handler handler = new Handler() {
/**
* 接收消息
*/
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SUCCESS: // 访问成功, 有数据
// 给Listview列表绑定数据
newInfoList = (List<NewInfo>) msg.obj;
MyAdapter adapter = new MyAdapter();
lvNews.setAdapter(adapter);
break;
case FAILED: // 无数据
Toast.makeText(MainActivity.this, "当前网络崩溃了.", 0).show();
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
lvNews = (ListView) findViewById(R.id.lv_news);
// 抓取新闻数据
new Thread(new Runnable() {
@Override
public void run() {
// 获得新闻集合
List<NewInfo> newInfoList = getNewsFromInternet();
Message msg = new Message();
if(newInfoList != null) {
msg.what = SUCCESS;
msg.obj = newInfoList;
} else {
msg.what = FAILED;
}
handler.sendMessage(msg);
}
}).start();
}
/**
* 返回新闻信息
*/
private List<NewInfo> getNewsFromInternet() {
HttpClient client = null;
try {
// 定义一个客户端
client = new DefaultHttpClient();
// 定义get方法
HttpGet get = new HttpGet("http://10.0.2.2:8081/NetEaseServer/new.xml");
// 执行请求
HttpResponse response = client.execute(get);
int statusCode = response.getStatusLine().getStatusCode();
if(statusCode == 200) {
InputStream is = response.getEntity().getContent();
List<NewInfo> newInfoList = getNewListFromInputStream(is);
return newInfoList;
} else {
Log.i(TAG, "访问失败: " + statusCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(client != null) {
client.getConnectionManager().shutdown(); // 关闭和释放资源
}
}
return null;
}
/**
* 从流中解析新闻集合
* @param is
* @return
*/
private List<NewInfo> getNewListFromInputStream(InputStream is) throws Exception {
XmlPullParser parser = Xml.newPullParser(); // 创建一个pull解析器
parser.setInput(is, "utf-8"); // 指定解析流, 和编码
int eventType = parser.getEventType();
List<NewInfo> newInfoList = null;
NewInfo newInfo = null;
while(eventType != XmlPullParser.END_DOCUMENT) { // 如果没有到结尾处, 继续循环
String tagName = parser.getName(); // 节点名称
switch (eventType) {
case XmlPullParser.START_TAG: // <news>
if("news".equals(tagName)) {
newInfoList = new ArrayList<NewInfo>();
} else if("new".equals(tagName)) {
newInfo = new NewInfo();
} else if("title".equals(tagName)) {
newInfo.setTitle(parser.nextText());
} else if("detail".equals(tagName)) {
newInfo.setDetail(parser.nextText());
} else if("comment".equals(tagName)) {
newInfo.setComment(Integer.valueOf(parser.nextText()));
} else if("image".equals(tagName)) {
newInfo.setImageUrl(parser.nextText());
}
break;
case XmlPullParser.END_TAG: //结果的节点
if("new".equals(tagName)) {
newInfoList.add(newInfo);
}
break;
default:
break;
}
eventType = parser.next(); // 取下一个事件类型
}
return newInfoList;
}
class MyAdapter extends BaseAdapter {
/**
* 返回列表的总长度
*/
@Override
public int getCount() {
return newInfoList.size();
}
/**
* 返回一个列表的子条目的布局
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if(convertView == null) {
LayoutInflater inflater = getLayoutInflater();
view = inflater.inflate(R.layout.listview_item, null);
} else {
view = convertView;
}
// 重新赋值, 不会产生缓存对象中原有数据保留的现象
SmartImageView sivIcon = (SmartImageView) view.findViewById(R.id.siv_listview_item_icon);
TextView tvTitle = (TextView) view.findViewById(R.id.tv_listview_item_title);
TextView tvDetail = (TextView) view.findViewById(R.id.tv_listview_item_detail);
TextView tvComment = (TextView) view.findViewById(R.id.tv_listview_item_comment);
NewInfo newInfo = newInfoList.get(position);
sivIcon.setImageUrl(newInfo.getImageUrl()); // 设置图片
tvTitle.setText(newInfo.getTitle());
tvDetail.setText(newInfo.getDetail());
tvComment.setText(newInfo.getComment() + "跟帖");
return view;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
}
}
JavaBean类
/**
* @author andong
* 新闻信息实体类
*/
public class NewInfo {
private String title; // 标题
private String detail; // 详细
private Integer comment; // 跟帖数量
private String imageUrl; // 图片连接
@Override
public String toString() {
return "NewInfo [title=" + title + ", detail=" + detail + ", comment="
+ comment + ", imageUrl=" + imageUrl + "]";
}
public NewInfo(String title, String detail, Integer comment, String imageUrl) {
super();
this.title = title;
this.detail = detail;
this.comment = comment;
this.imageUrl = imageUrl;
}
public NewInfo() {
super();
// TODO Auto-generated constructor stub
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
public Integer getComment() {
return comment;
}
public void setComment(Integer comment) {
this.comment = comment;
}
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
}
其中适配的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="wrap_content"
android:padding="5dip" >
<com.loopj.android.image.SmartImageView
android:id="@+id/siv_listview_item_icon"
android:layout_width="100dip"
android:layout_height="60dip"
android:src="@drawable/a" />
<TextView
android:id="@+id/tv_listview_item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="3dip"
android:layout_toRightOf="@id/siv_listview_item_icon"
android:singleLine="true"
android:text="3Q大战宣判: 腾讯获赔500万"
android:textColor="@android:color/black"
android:textSize="17sp" />
<TextView
android:id="@+id/tv_listview_item_detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@id/tv_listview_item_title"
android:layout_below="@id/tv_listview_item_title"
android:layout_marginTop="3dip"
android:text="啊发送旅客登机挥发速度发送旅客登机"
android:textColor="@android:color/darker_gray"
android:textSize="14sp" />
<TextView
android:id="@+id/tv_listview_item_comment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="668跟帖"
android:textColor="#FF0000"
android:textSize="12sp" />
</RelativeLayout>
服务器端xml
<?xml version="1.0" encoding="UTF-8" ?> <news> <new> <title>3Q大战宣判: 腾讯获赔500万</title> <detail>最高法驳回360上诉, 维持一审宣判.</detail> <comment>6427</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/1.jpg</image> </new> <new> <title>今日之声:北大雕塑被戴口罩</title> <detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail> <comment>681</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/2.jpg</image> </new> <new> <title>奥巴马见达赖是装蒜</title> <detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail> <comment>1359</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/3.jpg</image> </new> <new> <title>轻松一刻: 我要沉迷学习不自拔</title> <detail>放假时我醒了不代表我起床了, 如今我起床了不代表我醒了!</detail> <comment>10116</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/4.jpg</image> </new> <new> <title>男女那些事儿</title> <detail>"妈, 我在东莞被抓, 要2万保释金, 快汇钱到xxx!"</detail> <comment>10339</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/5.jpg</image> </new> <new> <title>3Q大战宣判: 腾讯获赔500万</title> <detail>最高法驳回360上诉, 维持一审宣判.</detail> <comment>6427</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/1.jpg</image> </new> <new> <title>今日之声:北大雕塑被戴口罩</title> <detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail> <comment>681</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/2.jpg</image> </new> <new> <title>奥巴马见达赖是装蒜</title> <detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail> <comment>1359</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/3.jpg</image> </new> <new> <title>轻松一刻: 我要沉迷学习不自拔</title> <detail>放假时我醒了不代表我起床了, 如今我起床了不代表我醒了!</detail> <comment>10116</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/4.jpg</image> </new> <new> <title>男女那些事儿</title> <detail>"妈, 我在东莞被抓, 要2万保释金, 快汇钱到xxx!"</detail> <comment>10339</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/5.jpg</image> </new> <new> <title>3Q大战宣判: 腾讯获赔500万</title> <detail>最高法驳回360上诉, 维持一审宣判.</detail> <comment>6427</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/1.jpg</image> </new> <new> <title>今日之声:北大雕塑被戴口罩</title> <detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail> <comment>681</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/2.jpg</image> </new> <new> <title>奥巴马见达赖是装蒜</title> <detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail> <comment>1359</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/3.jpg</image> </new> <new> <title>轻松一刻: 我要沉迷学习不自拔</title> <detail>放假时我醒了不代表我起床了, 如今我起床了不代表我醒了!</detail> <comment>10116</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/4.jpg</image> </new> <new> <title>男女那些事儿</title> <detail>"妈, 我在东莞被抓, 要2万保释金, 快汇钱到xxx!"</detail> <comment>10339</comment> <image>http://10.0.2.2:8080/NetEaseServer/images/5.jpg</image> </new> </news>
项目运行图：
项目代码下载：http://download.csdn.net/detail/itjavawfc/8139623