进一步使用Retrofit,结合MVP让你的网络请求更加方便

//Adapter的类创建出来等会使用

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{

    private Context context;
    private List<MyBean.SongListBean> song_list;

    public MyAdapter(Context context, List<MyBean.SongListBean> song_list) {
        this.context = context;
        this.song_list = song_list;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view=View.inflate(context, R.layout.rlv_item,null);
        ViewHolder holder=new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.tv_title.setText(song_list.get(position).title);
        holder.tv_name.setText(song_list.get(position).artist_name);
        DraweeController controller= Fresco.newDraweeControllerBuilder()
                .setUri(song_list.get(position).pic_big)
                .setAutoPlayAnimations(true)
                .build();
        holder.sdv.setController(controller);
    }

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

    class ViewHolder extends RecyclerView.ViewHolder{

        private final SimpleDraweeView sdv;
        private final TextView tv_title;
        private final TextView tv_name;

        public ViewHolder(View itemView) {
            super(itemView);
            sdv = itemView.findViewById(R.id.sdv);
            tv_title = itemView.findViewById(R.id.tv_title);
            tv_name = itemView.findViewById(R.id.tv_name);

        }
    }
}

//定义一个接口 Api 等会要使用到

public interface MyApi {
    //http://tingapi.ting.baidu.com/v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=10&offset=0

    public static final String URL="http://tingapi.ting.baidu.com/";

    @GET("v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=10&offset=0")
    Observable<MyBean> getCall();
}

//定义一个Fresco的加载图片用到的类

public class MyApp extends Application{
    @Override
    public void onCreate() {
        super.onCreate();
        Fresco.initialize(this);
    }
}

//创建一个Bean的类

//Model包下的类

public class ShopModel {

        public void getShop(){
            NetWorkUtils.getapi().getCall()
                    .subscribeOn(Schedulers.io())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(new Observer<MyBean>() {
                        @Override
                        public void onCompleted() {
                            System.out.println("====onCompleted===");
                        }

                        @Override
                        public void onError(Throwable e) {
                            System.out.println("====onError==="+e);
                        }

                        @Override
                        public void onNext(MyBean myBean) {
                            System.out.println("====onNext==="+myBean);
                            final List<MyBean.SongListBean> song_list = myBean.song_list;
                            onShop.getShopSuccess(song_list);
                        }
                    });
        }

        private OnShop onShop;

    public void setOnShop(OnShop onShop) {
        this.onShop = onShop;
    }

    public interface OnShop{
            void getShopSuccess(List<MyBean.SongListBean> song_list);
    }
}

//net包下创建一个NetWorkUtils的类

public class NetWorkUtils {

    private NetWorkUtils(){

    }
    private static MyApi api;

    public static MyApi getapi(){
        if(api==null){
            synchronized (NetWorkUtils.class){
                if(api==null){
                    OkHttpClient client=new OkHttpClient.Builder()
                            .addInterceptor(new LoggingInterceptor())
                            .build();

                    Retrofit retrofit=new Retrofit.Builder()
                            .baseUrl(MyApi.URL)
                            .client(client)
                            .addConverterFactory(GsonConverterFactory.create())
                            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                            .build();

                    api=retrofit.create(MyApi.class);
                }
            }
        }
        return api;
    }

}

//presenter包下创建一个IShopPresenter的接口

public interface IShopPresenter<T> {

    void  Attech(T view);
    void  Detech();
}

//presenter包下创建一个ShopPresenter的类

public class ShopPresenter implements IShopPresenter<ShopView>,ShopModel.OnShop {

    private ShopView shopView;
    private final ShopModel shopModel;
    private SoftReference<ShopView> softReference;

    public ShopPresenter(ShopView shopView) {
        this.shopView = shopView;
        shopModel = new ShopModel();
        shopModel.setOnShop(this);
    }

    public void requestShop(){
        shopModel.getShop();
    }

    @Override
    public void Attech(ShopView view) {
        softReference=new SoftReference<ShopView>(view);
        System.out.println("===attech===="+"绑定");
    }

    @Override
    public void Detech() {
        System.out.println("===detech==="+"解绑");
        softReference.clear();
    }

    @Override
    public void getShopSuccess(List<MyBean.SongListBean> song_list) {
        shopView.getShopSuccess(song_list);
    }
}

//view包下的view接口

public interface ShopView {

    void getShopSuccess(List<MyBean.SongListBean> song_list);

}

//创建一个BeasActivity的类

public abstract class BaseActivity<T extends IShopPresenter> extends AppCompatActivity{

    T mPresenter;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        createPresenter();
    }

    public abstract void createPresenter();

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mPresenter.Detech();
    }
}

//创建一个拦截器的类网络拦截器LoggingInterceptor

public class LoggingInterceptor implements Interceptor {
    private static final String UA = "User-Agent";

    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request()
                .newBuilder()
                .addHeader(UA, makeUA())
                .build();
        return chain.proceed(request);
    }

    private String makeUA() {
        String s = Build.BRAND + "/" + Build.MODEL + "/" + Build.VERSION.RELEASE;
        return Build.BRAND + "/" + Build.MODEL + "/" + Build.VERSION.RELEASE;
    }

}

//MainActivity的类

public class MainActivity extends BaseActivity<ShopPresenter> implements ShopView {

    @BindView(R.id.rlv)
    RecyclerView rlv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        mPresenter.requestShop();
    }

    @Override
   public void createPresenter() {
        mPresenter=new ShopPresenter(this);
    }

    @Override
    public void getShopSuccess(final List<MyBean.SongListBean> song_list) {

        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(MainActivity.this);
        rlv.setLayoutManager(linearLayoutManager);
        MyAdapter ma=new MyAdapter(MainActivity.this,song_list);
        rlv.setAdapter(ma);
    }
}

//Main的布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.bwei.duanzeshan.rxjava_retrofit.MainActivity">

   <android.support.v7.widget.RecyclerView
       android:id="@+id/rlv"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"></android.support.v7.widget.RecyclerView>

</RelativeLayout>

//item的布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:fresco="http://schemas.android.com/apk/res-auto">

    <com.facebook.drawee.view.SimpleDraweeView
        android:id="@+id/sdv"
        android:layout_width="150dp"
        android:layout_height="100dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        fresco:placeholderImage="@mipmap/ic_launcher"
        android:layout_marginLeft="18dp"
        android:layout_marginStart="18dp"
        android:layout_marginTop="17dp" />

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/sdv"
        android:layout_marginLeft="12dp"
        android:textSize="15sp"
        android:layout_marginStart="12dp"
        android:layout_toEndOf="@+id/sdv"
        android:layout_toRightOf="@+id/sdv"
        android:text="TextView" />

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/sdv"
        android:layout_marginBottom="12dp"
        android:layout_toEndOf="@+id/sdv"
        android:layout_toRightOf="@+id/sdv"
        android:text="TextView" />


</RelativeLayout>

//别忘了加联网权限呦！！！！

//加依赖

   compile 'com.squareup.retrofit2:retrofit:2.0.2'
    // Retrofit库
    compile 'com.squareup.okhttp3:okhttp:3.1.2'
    // Okhttp库
    compile 'com.squareup.retrofit2:converter-gson:2.0.2'
    compile 'io.reactivex:rxjava:1.0.14'
    compile 'io.reactivex:rxandroid:1.0.1'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.2'
    implementation 'com.android.support:recyclerview-v7:27.0.1'
    compile 'com.jakewharton:butterknife:8.5.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
    compile 'com.facebook.fresco:fresco:0.11.0'