retrofit + rxjava 网络请求展示数据

//依赖
 //retrofit加上gson解析
    implementation 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'
    //retrofit 和 rxjava结合
    implementation 'com.squareup.retrofit2:adapter-rxjava:2.0.1'

    //recycleview
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    //fresco
    implementation 'com.facebook.fresco:fresco:0.14.1'
    //rxjava
    implementation 'io.reactivex:rxandroid:1.2.1'
    implementation 'io.reactivex:rxjava:1.1.6'

//注册
package com.example.rikao19;

import android.app.Application;

import com.facebook.drawee.backends.pipeline.Fresco;

/**
 * date:2018/12/19
 * author:111(叮咯呤咚呛)
 * function:
 */
public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        Fresco.initialize(this);
    }
}

//存放接口类
public class Constant {
    public final static String url="http://www.xieast.com/api/";

}

//创建接口  记住是导rx的包

package com.example.rikao19;
import retrofit2.http.GET;
import rx.Observable;

/**
 * date:2018/12/19
 * author:111(叮咯呤咚呛)
 * function:
 */
public interface MyService {
    @GET("news/news.php")
    Observable<MainBean> getCall();
}

//adapter
package com.example.rikao19;

import android.content.Context;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.facebook.drawee.view.SimpleDraweeView;

import java.util.ArrayList;
import java.util.List;

/**
 * date:2018/12/19
 * author:111(叮咯呤咚呛)
 * function:
 */
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder> {

    List<MainBean.DataBean> list;
    Context mContext;

    public MainAdapter(Context context) {
        mContext = context;
        list = new ArrayList<>();
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = View.inflate(mContext,R.layout.recy_item,null);

        ViewHolder viewHolder = new ViewHolder(view);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
            viewHolder.time.setText(list.get(i).getAuthor_name());
            viewHolder.sex.setText(list.get(i).getCategory());
            viewHolder.mynicheng.setText(list.get(i).getAuthor_name());
            viewHolder.myname.setText(list.get(i).getDate());

        Uri url = Uri.parse(list.get(i).getThumbnail_pic_s());

        viewHolder.simple.setImageURI(url);
    }

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

    public void setData(List<MainBean.DataBean> data) {
        list = data;
        notifyDataSetChanged();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        SimpleDraweeView simple;
        TextView myname,mynicheng,sex,time;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);

            simple = itemView.findViewById(R.id.simple);
            myname = itemView.findViewById(R.id.myname);
            mynicheng = itemView.findViewById(R.id.mynicheng);
            sex = itemView.findViewById(R.id.sex);
            time = itemView.findViewById(R.id.time);
        }
    }
}

//.java
package com.example.rikao19;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.ImageView;

import java.util.List;

import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import rx.Observable;
import rx.Observer;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;


public class MainActivity extends AppCompatActivity {

    private ImageView image;
    private RecyclerView recy;
    MainAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

        initData();
    }

    private void initData() {
        mAdapter = new MainAdapter(this);

       Retrofit retrofit = new Retrofit.Builder()
               .baseUrl(Constant.url)
               .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
               .addConverterFactory(GsonConverterFactory.create())
               .build();

        MyService myService = retrofit.create(MyService.class);

        Observable<MainBean> call = myService.getCall();

        call.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<MainBean>() {
                    @Override
                    public void onCompleted() {

                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onNext(MainBean mainBean) {


                        List<MainBean.DataBean> data = mainBean.getData();

                        mAdapter.setData(data);

                        recy.setAdapter(mAdapter);

                        recy.setLayoutManager(new LinearLayoutManager(MainActivity.this));
                    }
                });


    }

    private void initView() {
        image = (ImageView) findViewById(R.id.image);
        recy = (RecyclerView) findViewById(R.id.recy);
    }
}