解析聚合新闻数据，并显示到主界面上（简易新闻 二）

获取解析聚合新闻数据，并显示到主界面上（简易新闻 二）

关于之前的功能实现可以从制作简易新闻App导航篇中查看

先上一下最终效果图：

关于界面的搭建请看上一篇

使用Fragment+ViewPager +TabLayout自制简易新闻 app主要框架（简易新闻 一）

准备事项

1. 需要在聚合数据上注册帐号，然后申请获取聚合数据新闻头条这个API，等到申请成功后，可以在我的接口中找到新闻头条API，并可以看到自己的AppKey，点击测试发送请求，将获取到的内容复制下来。
如下图：

2. 打开Android Studio ，点击左上角的file，在出现的选项中点击settings/Plugins中选择Browse，在在如下弹出的页面中选择搜索GsonFromat，然后选择安装 。
3. 在项目中新建一个 NewsBean.class，在打开的空白类中，右键选择Generate如图：

选择GsonFormat，然后将复制到的新闻json内容放入进去，点击ok，会自动生成聚合数据新闻头条API实体类。

聚合数据新闻头条json实体类NewsBean.class

package com.example.frametest.json;

import java.util.List;

public class NewsBean {

    private String reason;
    private ResultBean result;
    private int error_code;

    public String getReason() {
        return reason;
    }

    public void setReason(String reason) {
        this.reason = reason;
    }

    public ResultBean getResult() {
        return result;
    }

    public void setResult(ResultBean result) {
        this.result = result;
    }
    
    public int getError_code() {
        return error_code;
    }
    public void setError_code(int error_code) {
        this.error_code = error_code;
    }
    
    public static class ResultBean {
        private String stat;
        private List<DataBean> data;
        public String getStat() {
            return stat;
        }
        
        public void setStat(String stat) {
            this.stat = stat;
        }
        
        public List<DataBean> getData() {
            return data;
        }
        
        public void setData(List<DataBean> data) {
            this.data = data;
        }
        
        public static class DataBean {
            private String uniquekey;
            private String title;
            private String date;
            private String category;
            private String author_name;
            private String url;
            private String thumbnail_pic_s;
            private String thumbnail_pic_s02;
            private String thumbnail_pic_s03;

            public String getUniquekey() {
                return uniquekey;
            }

            public void setUniquekey(String uniquekey) {
                this.uniquekey = uniquekey;
            }

            public String getTitle() {
                return title;
            }

            public void setTitle(String title) {
                this.title = title;
            }

            public String getDate() {
                return date;
            }

            public void setDate(String date) {
                this.date = date;
            }

            public String getCategory() {
                return category;
            }

            public void setCategory(String category) {
                this.category = category;
            }

            public String getAuthor_name() {
                return author_name;
            }

            public void setAuthor_name(String author_name) {
                this.author_name = author_name;
            }

            public String getUrl() {
                return url;
            }

            public void setUrl(String url) {
                this.url = url;
            }

            public String getThumbnail_pic_s() {
                return thumbnail_pic_s;
            }

            public void setThumbnail_pic_s(String thumbnail_pic_s) {
                this.thumbnail_pic_s = thumbnail_pic_s;
            }

            public String getThumbnail_pic_s02() {
                return thumbnail_pic_s02;
            }

            public void setThumbnail_pic_s02(String thumbnail_pic_s02) {
                this.thumbnail_pic_s02 = thumbnail_pic_s02;
            }

            public String getThumbnail_pic_s03() {
                return thumbnail_pic_s03;
            }

            public void setThumbnail_pic_s03(String thumbnail_pic_s03) {
                this.thumbnail_pic_s03 = thumbnail_pic_s03;
            }
        }
    }
}

项目结构图

第一步修改list_item.xml文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v4.widget.SwipeRefreshLayout
            android:id="@+id/swipe_refresh"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <ListView
                android:id="@+id/listView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scrollbars="none">

            </ListView>
        </android.support.v4.widget.SwipeRefreshLayout>

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@drawable/ic_vertical_align_top"
            app:elevation="8dp" />
    </FrameLayout>
</android.support.design.widget.CoordinatorLayout>

第二步修改NewsFragment.class类

package com.example.frametest;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;

import com.example.frametest.json.NewsBean;
import com.example.frametest.TabAdapter.MyTabAdapter;
import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.List;

public class NewsFragment extends Fragment {
    private FloatingActionButton fab;
    private ListView listView;
    private SwipeRefreshLayout swipeRefreshLayout;
    private List<NewsBean.ResultBean.DataBean> list;
    private static final int UPNEWS_INSERT = 0;
    @SuppressLint("HandlerLeak")
    private Handler newsHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            String uniquekey,title,date, category,author_name,url,thumbnail_pic_s,thumbnail_pic_s02,thumbnail_pic_s03;
            switch (msg.what){
                case UPNEWS_INSERT:
                    list = ((NewsBean) msg.obj).getResult().getData();
                    MyTabAdapter adapter = new MyTabAdapter(getActivity(),list);
                    listView.setAdapter(adapter);
                    adapter.notifyDataSetChanged();
                    break;
            }
        }
    };
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.list_item,container,false);
        listView = (ListView) view.findViewById(R.id.listView);
        fab = (FloatingActionButton) view.findViewById(R.id.fab);
        swipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_refresh);
        return view;
    }

    @SuppressLint("HandlerLeak")
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        onAttach(getActivity());
        //获取传递的值
        Bundle bundle = getArguments();
        final String data = bundle.getString("name","top");
        //置顶功能
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                listView.smoothScrollToPosition(0);
            }
        });
        //下拉刷新
        swipeRefreshLayout.setColorSchemeResources(R.color.colorRed);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        swipeRefreshLayout.setRefreshing(false);
                      // 下一步实现从数据库中读取数据刷新到listview适配器中
                    }
                },1000);
            }
        });
        //异步加载数据
        getDataFromNet(data);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //获取点击条目的路径，传值显示webview页面
                String url = list.get(position).getUrl();
                String uniquekey = list.get(position).getUniquekey();
                final NewsBean.ResultBean.DataBean dataBean = (NewsBean.ResultBean.DataBean) list.get(position);
                Intent intent = new Intent(getActivity(),WebActivity.class);
                intent.putExtra("url",url);
                startActivity(intent);

            }
        });
    }
    private void getDataFromNet(final String data){
        @SuppressLint("StaticFieldLeak") AsyncTask<Void,Void,String> task = new AsyncTask<Void, Void, String>() {
            @Override
            protected String doInBackground(Void... params) {
                String path = "http://v.juhe.cn/toutiao/index?type="+data+"&key=547ee75ef186fc55a8f015e38dcfdb9a";
                URL url = null;
                try {
                    url = new URL(path);
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setReadTimeout(5000);
                    connection.setConnectTimeout(5000);

                    int responseCode = connection.getResponseCode();
                    if (responseCode == 200){
                        InputStream inputStream = connection.getInputStream();
                        String json = streamToString(inputStream,"utf-8");
                        return json;
                    } else {
                        System.out.println(responseCode);
                        return "已达到今日访问次数上限";
                    }

                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (ProtocolException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return "";
            }
            protected void onPostExecute(final String result){
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        NewsBean newsBean = new Gson().fromJson(result,NewsBean.class);
                        System.out.println(newsBean.getError_code());
                        if ("10012".equals(""+newsBean.getError_code())){
                              //下一篇将要实现从数据库加载数据
                        }
                        Message msg=newsHandler.obtainMessage();
                        msg.what=UPNEWS_INSERT;
                        msg.obj = newsBean;
                        newsHandler.sendMessage(msg);
                    }
                }).start();
            }
            @Override
            protected void onProgressUpdate(Void... values) {
                super.onProgressUpdate(values);
            }
        };
        task.execute();
    }

    private String streamToString(InputStream inputStream, String charset){
        try {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String s = null;
            StringBuilder builder = new StringBuilder();
            while ((s = bufferedReader.readLine()) != null){
                builder.append(s);
            }
            bufferedReader.close();
            return builder.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;

    }

}

第三步添加加载图片与解析json的引用

implementation 'com.google.code.gson:gson:2.8.5'
implementation 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'

其中图片加载使用的第三方库的github地址为：https://github.com/nostra13/Android-Universal-Image-Loader

第四步添加新闻图片格式文件

在res/layout中新建一个item_layout01.xml文件

在res/layout中新建一个item_layout02.xml文件

在res/layout中新建一个item_layout03.xml文件

第五步添加listview的适配器MyTabAdapter.class类

根据图片的数量可知有三种不同ViewType类型

package com.example.frametest.TabAdapter;

import android.content.Context;
import android.graphics.Bitmap;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.frametest.R;
import com.example.frametest.json.NewsBean;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import java.util.List;

public class MyTabAdapter extends BaseAdapter {
    private List<NewsBean.ResultBean.DataBean> list;
    private Context context;
    private int IMAGE_01 =0;
    private int IMAGE_02 = 1;
    private int IMAGE_03 = 2;
    public MyTabAdapter(Context context, List<NewsBean.ResultBean.DataBean> list){
        this.context = context;
        this.list = list;
        //配置lmageloader类
        ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(context));

    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getViewTypeCount() {
        return 3;
    }

    @Override
    public int getItemViewType(int position) {
        if (list.get(position).getThumbnail_pic_s() != null &&
                list.get(position).getThumbnail_pic_s02() !=null &&
                list.get(position).getThumbnail_pic_s03() !=null){
            return IMAGE_03;
        }else if (list.get(position).getThumbnail_pic_s() !=null &&
                list.get(position).getThumbnail_pic_s02() !=null){
            return IMAGE_02;
        }
        return IMAGE_01;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (getItemViewType(position) == IMAGE_01){
            Image01_ViewHolder holder;
            if (convertView == null){
                convertView =View.inflate(context, R.layout.item_layout01,null);
                holder =new Image01_ViewHolder();

                //查找控件
                holder.author_name = (TextView) convertView.findViewById(R.id.author_name);
                holder.title = (TextView) convertView.findViewById(R.id.title);
                holder.image = (ImageView) convertView.findViewById(R.id.image);
                convertView.setTag(holder);
            }else {
                holder = (Image01_ViewHolder) convertView.getTag();
            }

            //获取数据重新赋值
            holder.title.setText(list.get(position).getTitle());
            holder.author_name.setText(list.get(position).getAuthor_name());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),holder.image,getOption());
        }else if (getItemViewType(position) == IMAGE_02){
            Image02_ViewHolder holder;
            if (convertView == null){
                convertView =View.inflate(context, R.layout.item_layout02,null);
                holder =new Image02_ViewHolder();

                //查找控件
                holder.image002 = (ImageView) convertView.findViewById(R.id.image002);
                holder.image001 = (ImageView) convertView.findViewById(R.id.image001);
                holder.title = (TextView) convertView.findViewById(R.id.title);
                convertView.setTag(holder);
            }else {
                holder = (Image02_ViewHolder) convertView.getTag();
            }

            //获取数据重新赋值
            holder.title.setText(list.get(position).getTitle());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),holder.image001,getOption());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s02(),holder.image002,getOption());
        } else {
            Image03_ViewHolder holder;
            if (convertView == null){
                convertView =View.inflate(context, R.layout.item_layout03,null);
                holder =new Image03_ViewHolder();

                //查找控件
                holder.image01 = (ImageView) convertView.findViewById(R.id.image01);
                holder.image02 = (ImageView) convertView.findViewById(R.id.image02);
                holder.image03 = (ImageView) convertView.findViewById(R.id.image03);
                holder.title = (TextView) convertView.findViewById(R.id.title);
                convertView.setTag(holder);
            }else {
                holder = (Image03_ViewHolder) convertView.getTag();
            }

            //获取数据重新赋值
            holder.title.setText(list.get(position).getTitle());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),holder.image01,getOption());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s02(),holder.image02,getOption());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s03(),holder.image03,getOption());
        }
        return convertView;
    }
    //配置图片加载失败和加载中显示的Android小机器人logo
    public static DisplayImageOptions getOption() {
        DisplayImageOptions options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.mipmap.ic_launcher) // 设置图片下载期间显示的图片
                .showImageForEmptyUri(R.mipmap.ic_launcher) // 设置图片Uri为空或是错误的时候显示的图片
                .showImageOnFail(R.mipmap.ic_launcher) // 设置图片加载或解码过程中发生错误显示的图片
                .resetViewBeforeLoading(true)  // default 设置图片在加载前是否重置、复位
                .delayBeforeLoading(1000)  // 下载前的延迟时间
                .cacheInMemory(true) // default  设置下载的图片是否缓存在内存中
                .cacheOnDisk(true) // default  设置下载的图片是否缓存在SD卡中
                .imageScaleType(ImageScaleType.EXACTLY_STRETCHED) // default 设置图片以如何的编码方式显示
                .bitmapConfig(Bitmap.Config.RGB_565) // default 设置图片的解码类型
                .build();

        return options;
    }

    static  class  Image01_ViewHolder{
        TextView title,author_name;
        ImageView image;
    }
    static  class  Image02_ViewHolder{
        TextView title;
        ImageView image001,image002;
    }
    static  class  Image03_ViewHolder{
        TextView title;
        ImageView image01,image02,image03;
    }
}

第六步添加网络权限

在AndroidManifest.xml文件中添加权限：

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

好了，本篇到此结束，总体来说还是比较容易实现的，下篇将会实现连接数据库，并实现用户交互的的一些功能（注册，个人收藏以及下拉刷新等等）。

连接数据库，实现下拉刷新（简易新闻 三）

项目源码GitHub地址为：https://github.com/ziruiliu1/MyBlog

资源点此处下载

新做出的改动，去掉listView的间隔线

修改list_item.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v4.widget.SwipeRefreshLayout
            android:id="@+id/swipe_refresh"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <ListView
                android:id="@+id/listView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:divider="@color/colorWhite"
                android:scrollbars="none">
//对listview进行添加divider属性修改间隔线为透明白色
            </ListView>
        </android.support.v4.widget.SwipeRefreshLayout>

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@drawable/ic_vertical_align_top"
            app:elevation="8dp" />
    </FrameLayout>
</android.support.design.widget.CoordinatorLayout>

修改后的效果图：

本人博客地址：www.tobey-r1.top