RecyclerView+Retrofit+OkHttp+RxJava

*图片初始化
public class FrescoClass extends Application{
    @Override
    public void onCreate() {
        super.onCreate();
        Fresco.initialize(this);
    }
}

*主页面

public class MainActivity extends AppCompatActivity {


    private RecyclerView mRv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        Flowable<UserBean> add = RetrofitHelper.getShopAPI().add();
        //使用Rxjava异步
        add.subscribeOn(Schedulers.io())//被观察者执行线程
                .observeOn(AndroidSchedulers.mainThread())//观察者线程
                .subscribe(new Consumer<UserBean>() {
                    @Override
                    public void accept(UserBean userBean) throws Exception {
                        List<UserBean.NewslistBean> newslist = userBean.getNewslist();
                        mRv.setLayoutManager(new LinearLayoutManager(MainActivity.this));
                        MyAdapter myAdapter = new MyAdapter(newslist,MainActivity.this);
                        mRv.setAdapter(myAdapter);
                       // Toast.makeText(MainActivity.this,newslist.get(1).getCtime(),Toast.LENGTH_LONG).show();
                    }
                });


    }

    private void initView() {
        mRv = (RecyclerView) findViewById(R.id.rv);
    }
}

*适配器
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
    private List<UserBean.NewslistBean> list;
    private Context context;

    public MyAdapter(List<UserBean.NewslistBean> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item,parent,false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        MyViewHolder my = (MyViewHolder) holder;
        my.tv.setText(list.get(position).getTitle());
        Uri uri = Uri.parse(list.get(position).getPicUrl());
        my.img.setImageURI(uri);
    }

    @Override
    public int getItemCount() {
        return list.size();
    }
    class MyViewHolder extends RecyclerView.ViewHolder{

        private final SimpleDraweeView img;
        private final TextView tv;

        public MyViewHolder(View itemView) {
            super(itemView);
            img = itemView.findViewById(R.id.img);
           tv = itemView.findViewById(R.id.tv);
        }
    }
}

*网络接口

public class net {
    public static final String A = "http://api.tianapi.com/";
    public static final String B = "nba/?key=71e58b5b2f930eaf1f937407acde08fe&num=10";
}

* 封装的网络请求的类
 
public class RetrofitHelper {

    private static OkHttpClient okHttpClient;

    private static ServiceApi serviceApi;

    static {
        initOkHttpClient();
    }

    /**
     * 初始化 OkHttpClient
     */
    private static void initOkHttpClient() {

        if (okHttpClient == null) {
            synchronized (RetrofitHelper.class) {
                if (okHttpClient == null) {
                    okHttpClient = new OkHttpClient.Builder()
                            .build();
                }
            }
        }

    }

    /**
     * 定义一个泛型方法
     *
     * @param clazz
     * @param url
     * @param <T>
     * @return
     */
    public static <T> T createAPI(Class<T> clazz, String url) {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(url)
                .client(okHttpClient)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();
        return retrofit.create(clazz);
    }

    public static ServiceApi getShopAPI() {
        if (serviceApi == null) {
            synchronized (RetrofitHelper.class) {
                if (serviceApi == null) {
                    serviceApi = createAPI(ServiceApi.class, net.A);
                }
            }
        }
        return serviceApi;
    }

}

*接口
public interface ServiceApi {
    @GET(net.B)
    Flowable<UserBean> add();
}
*封装bean类

public class UserBean {

    /**
     * code : 200
     * msg : success
     * newslist : [{"ctime":"2016-12-04 13:00","title":"格林：理解科尔吸食大麻 不过我从没吸过","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161204/1-161204120131.jpg","url":"http://www.51tyw.com/nba/2421.html"},{"ctime":"2016-12-04 00:00","title":"三分纪录延续！火箭队连续19场比赛命中10+三分球","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161203/1-161203233J3.jpg","url":"http://www.51tyw.com/nba/2417.html"},{"ctime":"2016-12-04 00:00","title":"詹姆斯谈三连败：是时候紧起来了 必须打得男人点","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161203/1-161203234010.jpg","url":"http://www.51tyw.com/nba/2418.html"},{"ctime":"2016-12-03 12:00","title":"骑士输赢都靠三分？那还要詹姆斯做什么？","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161203/1-161203104344.jpg","url":"http://www.51tyw.com/nba/2407.html"},{"ctime":"2016-12-03 00:00","title":"公牛vs骑士直播看点：詹伟兄弟对决","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-161202221205.jpg","url":"http://www.51tyw.com/nba/2395.html"},{"ctime":"2016-12-02 22:00","title":"火箭和勇士联手创NBA三分纪录","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-161202214212.jpg","url":"http://www.51tyw.com/nba/2392.html"},{"ctime":"2016-12-02 22:00","title":"巴克利：勇士打得像女式篮球，太软了！","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-161202215032.jpg","url":"http://www.51tyw.com/nba/2394.html"},{"ctime":"2016-12-02 20:00","title":"詹姆斯完成月最佳球员4连霸的壮举！","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161202/1-1612021PI0.jpg","url":"http://www.51tyw.com/nba/2388.html"},{"ctime":"2016-12-01 00:00","title":"威少再下三双战书！詹皇会不会先认怂？","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161128/1-16112Q13251.jpg","url":"http://www.51tyw.com/nba/2374.html"},{"ctime":"2016-12-01 00:00","title":"骑士这样的防守想夺冠？也许卫冕只是空谈！","description":"NBA新闻","picUrl":"http://www.51tyw.com/uploads/allimg/161130/1-161130222229.jpg","url":"http://www.51tyw.com/nba/2375.html"}]
     */

    private int code;
    private String msg;
    private List<NewslistBean> newslist;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public List<NewslistBean> getNewslist() {
        return newslist;
    }

    public void setNewslist(List<NewslistBean> newslist) {
        this.newslist = newslist;
    }

    public static class NewslistBean {
        /**
         * ctime : 2016-12-04 13:00
         * title : 格林：理解科尔吸食大麻 不过我从没吸过
         * description : NBA新闻
         * picUrl : http://www.51tyw.com/uploads/allimg/161204/1-161204120131.jpg
         * url : http://www.51tyw.com/nba/2421.html
         */

        private String ctime;
        private String title;
        private String description;
        private String picUrl;
        private String url;

        public String getCtime() {
            return ctime;
        }

        public void setCtime(String ctime) {
            this.ctime = ctime;
        }

        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 String getPicUrl() {
            return picUrl;
        }

        public void setPicUrl(String picUrl) {
            this.picUrl = picUrl;
        }

        public String getUrl() {
            return url;
        }

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