Android网络编程之简易新闻客户端

package cn.edu.bzu.anew.entity; 
 
/** 
 * Created by Administrator on 2017/5/18. 
 */ 
public class NewsInfo { 
 private String icon;//图片路径 
 private String title;//新闻标题 
 private String description;//新闻描述 
 private int type;//新闻类型 
 private long comment;//新闻评论数 
 
 public NewsInfo(String icon, String title, String description, int type, long comment) { 
  this.icon = icon; 
  this.title = title; 
  this.description = description; 
  this.type = type; 
  this.comment = comment; 
 } 
 
 public String getIcon() { 
  return icon; 
 } 
 
 public void setIcon(String icon) { 
  this.icon = icon; 
 } 
 
 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; 
 } 
} 

package cn.edu.bzu.anew.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.anew.entity.NewsInfo; 
 
/** 
 * Created by Administrator on 2017/5/18. 
 */ 
 
public class JsonParse { 
 public static List<NewsInfo>getNewsInfo(String json){//使用gson库解析Json数据 
  Gson gson =new Gson(); 
  Type listType=new TypeToken<List<NewsInfo>> (){//创建一个typeToken的匿名子类对象，并调用对象得getType()方法 
  }.getType(); 
  List<NewsInfo>newsInfos=gson.fromJson(json,listType);//把获取到的信息集合存到newsInfos中 
  return newsInfos; 
 } 
} 

package cn.edu.bzu.anew.adapter; 
import android.content.Context; 
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.anew.R; 
import cn.edu.bzu.anew.entity.NewsInfo; 
public class NewsAdapter extends ArrayAdapter<NewsInfo>{ 
 public NewsAdapter(Context context, List<NewsInfo> objects) { 
  super(context, R.layout.news_item, objects); 
 
 } 
 
 @NonNull 
 @Override 
 public View getView(int position, View convertView, ViewGroup parent) { 
  NewsInfo newsinfo= getItem(position);//传递position，获取当前位置对应的newsinfo新闻信息 
  View view=null; 
  viewHolder viewHolder; 
  if(convertView==null){ //判断convertView中是否加载了布局，有没有缓存。为空说明没有缓存 
   view=LayoutInflater.from(getContext()).inflate(R.layout.news_item,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); //保存 
  }else{ 
   view=convertView; 
   viewHolder=(viewHolder) view.getTag(); 
  } 
  viewHolder.siv.setImageUrl(newsinfo.getIcon());//传递图片地址 
  viewHolder.tv_title.setText(newsinfo.getTitle());//传递题目 
  viewHolder.tv_description.setText(newsinfo.getDescription()); 
  viewHolder.tv_type.setText(newsinfo.getType()+""); 
  return view; 
 } 
 class viewHolder{//添加类，封装需要查找的控件 
  TextView tv_title; 
  TextView tv_description; 
  TextView tv_type; 
  SmartImageView siv; 
 
 } 
} 

package cn.edu.bzu.anew; 
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.List; 
import cn.edu.bzu.anew.Tools.JsonParse; 
import cn.edu.bzu.anew.adapter.NewsAdapter; 
import cn.edu.bzu.anew.entity.NewsInfo; 
public class MainActivity extends AppCompatActivity { 
 private ListView lvNews; 
 private List<NewsInfo> newsInfos; 
 private LinearLayout loading; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
  lvNews=(ListView)findViewById(R.id.lv_news); 
  loading=(LinearLayout)findViewById(R.id.loading); 
  fillData(); 
 
 } 
 private void fillData(){ 
  AsyncHttpClient client =new AsyncHttpClient(); 
 
  client.get("http://10.61.28.176:8080/NewsInfo.json",new AsyncHttpResponseHandler(){ 
   @Override 
   public void onSuccess(int i, org.apache.http.Header[] headers, byte[] bytes) { 
    try{ 
     String json=new String(bytes,"utf-8"); 
     newsInfos= JsonParse.getNewsInfo(json); 
     if(newsInfos==null){ 
      Toast.makeText(MainActivity.this,"解析失败", Toast.LENGTH_LONG).show(); 
     }else{ 
      loading .setVisibility(View.INVISIBLE); 
      lvNews.setAdapter(new NewsAdapter(MainActivity.this,newsInfos)); 
     } 
    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } 
   } 
 
   @Override 
   public void onFailure(int i, org.apache.http.Header[] headers, byte[] bytes, Throwable throwable) { 
 
   } 
  } ); 
 
 
 } 
}