新闻客户端案例——（AsycHttpClient，SmartImageView，JSON）

来源：互联网发布：算法导论epub 编辑：程序博客网时间：2024/06/18 11:06

运行效果图：
这里写图片描述

注意：
1.该程序运行前一定要开启Tomcat服务器，在Tomcat服务器根目录下找到bin文件夹，找到 startup.bat,点击运行开启服务器。
2.添加Json包的过程：
这里写图片描述

主界面代码：

?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:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity"    android:orientation="vertical">    <FrameLayout        android:layout_width="match_parent"        android:layout_height="match_parent">        <LinearLayout            android:id="@+id/loading"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:gravity="center"            android:orientation="vertical"            android:visibility="invisible">            <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:id="@+id/lv_news"            android:layout_width="match_parent"            android:layout_height="match_parent" />    </FrameLayout></LinearLayout>

ListView的item：

<?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="65dp">    <com.loopj.android.image.SmartImageView        android:id="@+id/siv_icon"        android:layout_width="80dp"        android:layout_height="60dp"        android:scaleType="centerCrop"        android:src="@mipmap/ic_launcher"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"></com.loopj.android.image.SmartImageView>    <TextView        android:id="@+id/tv_title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="5dp"        android:layout_marginTop="10dp"        android:layout_toRightOf="@id/siv_icon"        android:ellipsize="end"        android:maxLength="20"        android:singleLine="true"        android:text="我是标题"        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="5dp"        android:layout_marginTop="5dp"        android:layout_toRightOf="@id/siv_icon"        android:ellipsize="end"        android:maxLength="16"        android:maxLines="1"        android:text="我是描述"        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="5dp"        android:layout_marginRight="10dp"        android:text="评论"        android:textColor="#99000000"        android:textSize="12sp" /></RelativeLayout>

json文件的实体类：

package cn.edu.bzu.mynews.entity;/** * Created by lm on 2017/5/18. */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;    }}

json解析类：

package cn.edu.bzu.mynews.Tools;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import java.lang.reflect.Type;import java.util.List;import cn.edu.bzu.mynews.entity.NewsInfo;/** * Created by lm on 2017/5/18. */public class JsonParse {    public static List<NewsInfo> getNewInfo(String json){        Gson gson=new Gson();        Type listType=new TypeToken<List<NewsInfo>>(){        }.getType();        List<NewsInfo> newsInfos=gson.fromJson(json,listType);       return newsInfos;    }}

适配器：

package cn.edu.bzu.mynews.adapter;/** * Created by lm on 2017/5/18. */import android.content.Context;import android.graphics.Color;import android.support.annotation.NonNull;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.TextView;import com.loopj.android.image.SmartImageView;import java.util.List;import cn.edu.bzu.mynews.R;import cn.edu.bzu.mynews.entity.NewsInfo;public class NewAdapter extends ArrayAdapter<NewsInfo>{private  int resourceID;    public NewAdapter(Context context, int resource, List<NewsInfo> objects) {        super(context, resource, objects);        resourceID=resource;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        NewsInfo newsInfos=getItem(position);        View view;        ViewHolder viewHolder;        if(convertView==null){             view=LayoutInflater.from(getContext()).inflate(resourceID,null);             viewHolder=new ViewHolder();            viewHolder.siv=(SmartImageView)view.findViewById(R.id.siv_icon);            viewHolder.tv_title=(TextView)view.findViewById(R.id.tv_title);            viewHolder.tv_description=(TextView)view.findViewById(R.id.tv_description);            viewHolder.tv_type=(TextView)view.findViewById(R.id.tv_type);            view.setTag(viewHolder);        }else{            view=convertView;            viewHolder= (ViewHolder) view.getTag();        }        viewHolder.siv.setImageUrl(fruit.getIconPath(),R.drawable.a,R.drawable.ic_launcher);        viewHolder.tv_title.setText(fruit.getTitle());        viewHolder.tv_description.setText(fruit.getDescription());        int type=fruit.getType();        switch (type){            case 1:                viewHolder.tv_type.setText("评论："+fruit.getComment());                viewHolder.tv_type.setTextColor(Color.BLUE);                break;            case 2:                viewHolder.tv_type.setText("专题");                viewHolder.tv_type.setTextColor(Color.BLACK);                break;            case 3:                viewHolder.tv_type.setText("LIVE");                viewHolder.tv_type.setTextColor(Color.RED);                break;        }        return view;    }    class ViewHolder{        SmartImageView siv;        TextView tv_title;        TextView tv_description;        TextView tv_type;    }}

MainActivity:

package cn.edu.bzu.mynews;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.Toast;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.AsyncHttpResponseHandler;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.List;import cn.edu.bzu.mynews.Tools.JsonParse;import cn.edu.bzu.mynews.adapter.NewAdapter;import cn.edu.bzu.mynews.entity.NewsInfo;import cn.edu.bzu.mynews.model.Fruit;public class MainActivity extends AppCompatActivity {    private ListView Iv_news;    private NewAdapter newAdapter;    private List<NewsInfo> newInfos;    private LinearLayout loading;    private JsonParse jsonParse;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Iv_news= (ListView) findViewById(R.id.lv_news);        newAdapter =new NewAdapter(this,R.layout.news_item,newInfos);        loading= (LinearLayout) findViewById(R.id.loading);        prepareData();    }    private void prepareData() {        AsyncHttpClient asyncHttpClient=new AsyncHttpClient();        asyncHttpClient.get(getString(R.string.serverurl), new AsyncHttpResponseHandler() {            @Override            public void onSuccess(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes) {                try {                    String json=new String(bytes,"utf-8");                    newInfos=jsonParse.getNewInfo(json);                    if(newInfos==null){                        Toast.makeText(MainActivity.this,"解析失败",Toast.LENGTH_SHORT).show();                    }                    else {                        loading.setVisibility(View.INVISIBLE);                        Iv_news.setAdapter(newAdapter);                    }                } catch (UnsupportedEncodingException e) {                    e.printStackTrace();                }            }            @Override            public void onFailure(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes, Throwable throwable) {                Toast.makeText(MainActivity.this,"请求失败",Toast.LENGTH_SHORT).show();            }        });    }}

新闻的具体内容（NewsInfo）：
在tomca的安装目录下打开webapps文件，将NewsInfo.xml文件放置在root文件下。在线json编辑器:http://www.qqe2.com/json

注意的值代表图片的地址，因此需要在ROOT，目录下创建一个images的文件夹，添加相应的照片。
图片素材：
这里写图片描述

最后添加权限：

<uses-permission android:name="android.permission.INTERNET"/>

[  {    "icon": "http://192.168.1.109:8080/images/a.jpg",    "title": "科技温暖世界",    "content": "进入一个更有爱的领域",    "type": "1",    "comment": "69"  },  {    "icon": "http://172.20.103.1:8080/images/b.jpg",    "title": "《神武》",    "content": "新美术资源盘点，视觉新体验",    "type": "2",    "comment": "35"  },  {    "icon": "http://172.20.103.1:8080/images/c.jpg",    "title": "南北车正式公布合并",    "content": "南北车将于今日正式公布合并",    "type": "3",    "comment": "2"  },  {    "icon": "http://172.20.103.1:8080/images/d.jpg",    "title": "萌呆了！汪星人抱玩偶酣睡",    "content": "汪星人抱玩偶酣睡，萌翻网友",    "type": "1",    "comment": "25"  },  {    "icon": "http://172.20.103.1:8080/images/e.jpg",    "title": "风力发电进校园",    "content": "风力发电普进校园",    "type": "2",    "comment": "26"  },  {    "icon": "http://172.20.103.1:8080/images/f.jpg",    "title": "地球一小时",    "content": "地球熄灯一小时",    "type": "1",    "comment": "23"  },  {    "icon": "http://172.20.103.1:8080/images/g.jpg",    "title": "最美公路",    "content": "最美公路，难以想象",    "type": "1",    "comment": "23"  }]

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