Android 新闻客户端

1.页面布局：

MainActivity.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context="cn.edu.bzu.news.MainActivity">
    <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>
</RelativeLayout>

News.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context="cn.edu.bzu.news.MainActivity">

    <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>
</RelativeLayout>

2.新建包：

NewsAdapter.java:

package cn.edu.bzu.news.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.news.R;
import cn.edu.bzu.news.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());
        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;
    }
}

NewsInfo.java:

package cn.edu.bzu.news.entity;
/**
 * Created by Administrator on 2017/5/18.
 */
public class NewsInfo {
    private  String icon;
    private  String title;
    private  String description;
    private  int type;
    private  long comment;

    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;
    }
}

JsonParse：

package cn.edu.bzu.news.tool;

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

3.主体包：

MainActivity：

package cn.edu.bzu.news;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
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.news.entity.NewsInfo;
import cn.edu.bzu.news.tool.JsonParse;




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 cn.edu.bzu.news.adapter.NewsAdapter(MainActivity.this,newsInfos));
                    }
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }


            @Override
            public void onFailure(int i, org.apache.http.Header[] headers, byte[] bytes, Throwable throwable) {


            }
        } );




    }
}