新闻客户端(AsyncHttpClient和SmartImageView的综合使用

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1.创建程序xinwenkehuduan

   a.布局文件如下所示:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.bz0209.xinwenkehuduan.MainActivity">    <FrameLayout        android:layout_width="match_parent"        android:layout_height="match_parent">        <LinearLayout            android:layout_width="match_parent"            android:layout_height="match_parent"            android:id="@+id/loading"            android:visibility="invisible"            android:gravity="center"            android:orientation="vertical">            <ProgressBar                android:layout_width="wrap_content"                android:layout_height="wrap_content" />            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="正在加载信息......"                />        </LinearLayout>        <ListView            android:layout_width="match_parent"            android:layout_height="match_parent"            android:id="@+id/lv_news">        </ListView>    </FrameLayout></LinearLayout>
    b.界面如下1-1所示:
         1-1                      1-2
      

2.创建ListView Item的布局:

   a.ListView的Item布局文件如下所示:
<?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="65dip">  <com.loopj.android.image.SmartImageView      android:id="@id/siv_icon"      android:layout_width="80dip"      android:layout_height="60dip"      android:layout_alignParentLeft="true"      android:layout_marginButtom="5dip"      android:layout_marginLeft="5dip"      android:layout_marginTop="5dip"      android:scaleType="centerCrop"      android:src="@mipmap/ic_launcher">  </com.loopj.android.image.SmartImageView>      <TextView          android:id="@+id/tv_title"          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_marginLeft="5dip"          android:layout_marginTop="10dip"          android:layout_toRightOf="@+id/siv_icon"          android:text="我是标题"          android:maxLength="20"          android:singleLine="true"          android:ellipsize="end"          android:textColor="#000000"          android:textSize="18sp"          />   <TextView       android:id="@+id/tv_description"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_below="@id/tv_title"       android:layout_marginLeft="5dip"       android:layout_marginTop="5dip"       android:layout_toRightOf="@+id/siv_icon"       android:text="我是描述"       android:maxLength="16"       android:singleLine="true"       android:ellipsize="end"       android:textColor="#99000000"       android:textSize="14sp"       />    <TextView        android:id="@+id/tv_type"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentRight="true"        android:layout_marginBottom="5dip"        android:text="评论"        android:textColor="#99000000"        android:textSize="12sp"        /></RelativeLayout>
    b.界面如图1-2所示。

   3.编写界面交互代码如下所示:

     a.用于实现获取服务器的NewsInfo.xml文件解析并将解析的信息设置到ListView显示在界面上。

    
import android.graphics.Color;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.loopj.android.image.SmartImageView;import java.io.ByteArrayInputStream;import java.util.List;public class MainActivity extends AppCompatActivity {    private ListView lv_news;    private LinearLayout loading;    private List<NewsInfo> newsInfos;    private class NewsAdapter extends BaseAdapter{        @Override        public int getCount() {            return newsInfos.size();        }        public View getView(int position, View convertView , ViewGroup parent) {            View view = View.inflate(MainActivity.this, R.layout.news_item, null);            SmartImageView siv = (SmartImageView) view.findViewById(R.id.siv_icon);            TextView tv_title = (TextView) view.findViewById(R.id.tv_title);            TextView tv_description = (TextView) view.findViewById(R.id.tv_description);            NewsInfo newsInfo = newsInfos.get(position);            siv.setImageUrl(newsInfo.getIconPath(), R.drawable.ab, R.drawable.ic_launcher);            tv_title.setText(newsInfo.getTitle);            tv_description.setText(newsInfo.getDescription);            int type = newsInfo.getType();            switch (type) {                case 1:                    tv_type.setText("评论:" + newsInfo.getComment());                    break;                case 2:                    tv_type.setTextColor(Color.RED);                    tv_type.setText("专题");                    break;                ;                case 3:                    tv_type.setTextColor(Color.BLUE);                    tv_type.setText("LIVE");                    break;                ;            }            return view;        }            public Object getItem(int position){            return null;        }           public  long getItemId(int position){            return 0;        }        }    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv_news = (ListView) findViewById(R.id.lv_news);        loading = (LinearLayout) findViewById(R.id.loading);        fillData2();    }private void fillData2(){      AsyncHttpClient  asyncHttpClient=new AsyncHttpClient();     asyncHttpClient.get(getString(android.R.string.serverurl)),new AsyncHttpResponHandler(){         public void onSuccess(String content){             super.onSuccess(content);             byte[] bytes=content.getBytes();             ByteArrayInputStream bais=new ByteArrayInputStream(bytes);             newsInfos=NewsInfoService.getNewsInfos(bais);             if(newsInfos==null){                 Toast.makeText(MainActivity.this,"解析失败",0).show();             }else{                 loading.setVisibility(View.INVISIBLE);                 lv_news.steAdapter(new NewsAdapter());             }         }         public void onFailure(Throwable error,String content){             super.onFailure(error.content);             Toast.makeText(MainActivity.this,"请求失败",0).show();         }     };     }    }

  4.创建NewsInfo类

   a.具体代码如下:       

public class NewsInfo {    private String iconPath;    private String title;    private String description;    private int type;    private long comment;    public String getIconPath() {        return iconPath;    }    public void setIconPath(String iconPath) {        this.iconPath = iconPath;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getDescription() {        return description;    }    public void setDescription(String description) {        this.description = description;    }    public int getType() {        return type;    }    public void setType(int type) {        this.type = type;    }    public long getComment() {        return comment;    }    public void setComment(long comment) {        this.comment = comment;    }}

4..创建工具NewsInfoService类解析Xml文件

   a.具体代码如下:
    
import android.util.Xml;import android.widget.Switch;import org.xmlpull.v1.XmlPullParser;import java.io.InputStream;import java.util.ArrayList;import java.util.List;public class NewsInfoService {    public static List<NewsInfo> getNewsInfos(InputStream is){        XmlPullParser parser= Xml.newPullParser();        try{            parser.setInput(is,"utf-8");            int type=parser.getEventType();            List<NewsInfo> newsInfos=null;            NewsInfo newsInfo=null;            while(type!=XmlPullParser.END_DOCUMENT){                switch(type){                    case XmlPullParser.START_TAG:                        if("news".equals(parser.getName())){                            newsInfos=new ArrayList<NewsInfo>();                        }else if("newsInfo" .equals(parser.getName())){                            newsInfo=new NewsInfo();                        }else if("icon".equals(parser.getName())){                            String icon=parser.nextText();                            newsInfo.setIconPath(icon);                        }else if("title".equals(parser.getName())){                            String title=parser.nextText();                            newsInfo.setTitle(title);                        }else if("content".equals(parser.getName())){                            String description=parser.nextText();                            newsInfo.setDescription(description);                        }else if("type".equals(parser.getName())){                            String newsType=parser.nextText();                            newsInfo.setType(Integer.parseInt(newsType));                        }else if("comment".equals(parser.getName())){                            String comment=parser.nextText();                            newsInfo.setComment(Long.parseLong(comment));                        }                        break;                    case XmlPullParser.END_TAG:                        if("newsInfo".equals(parser.getName())){                            newsInfos.add(newsInfo);                            newsInfo=null;                        }                        break;                }                type=parser.next();            }            return  newsInfos;        }catch (Exception e){            e.printStackTrace();            return  null;        }      }}

 6.配置服务器:

   a.启动tomcat服务器,在tomcat根目录下找bin文件夹,运行tomcat服务器,在tomcat的安装目录下打开webapps文件夹,将NewsInfo.xml文件放置在ROOT文件夹下,NewsInfo.xml代码如下:
   
<new>    <newsInfo>        <icom>http://172.16.25.13:8080/img/a.jpg</icom>        <title>科技温暖世界</title>        <type>1</type>        <comment>69</comment>    </newsInfo>    <newsInfo>        <icom>http://172.16.25.13:8080/img/b.jpg</icom>        <title>《神武》</title>        <content>新美术资源盘点 视觉新体验</content>        <type>2</type>        <comment>35</comment>    </newsInfo>    <newsInfo>        <icom>http://172.16.25.13:8080/img/c.jpg</icom>        <title>南北车正式公布合并</title>        <content>南北车将于今日正式公布合并</content>        <type>3</type>        <comment>2</comment>    </newsInfo>    <newsInfo>        <icom>http://172.16.25.13:8080/img/d.jpg</icom>    <title>北京拟推医生电子注册</title>    <content>突破多点执业“限制”</content>    <type>1</type>    <comment>25</comment>    </newsInfo>    <newsInfo>        <icom>http://172.16.25.13:8080/img/e.jpg</icom>        <title>风力发电进校园</title>        <content>风力发电普进校园</content>        <type>2</type>        <comment>26</comment>    </newsInfo>    <newsInfo>        <icom>http://172.16.25.13:8080/img/f.jpg</icom>        <title>地球一小时</title>        <content>地球熄灯一小时</content>        <type>1</type>        <comment>23</comment>    </newsInfo></new>
  7.JSON文件:
 http://www.qqe2.com/ json在线编辑器 
  8.运行图如下所示:
    
   

  




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