XrecyclerView上拉加载下拉刷新+RXjava+retrofit+fresco+MVP

依赖：

//XrecyclerView：
    
    compile 'com.jcodecraeer:xrecyclerview:1.5.9'

//RXjava依赖：
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
    implementation 'io.reactivex.rxjava2:rxjava:2.0.2'
    
    implementation 'com.squareup.retrofit2:retrofit:2.0.2'
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.0.2'

    //  -----------retrofit依赖
    implementation 'com.squareup.retrofit2:retrofit:2.0.2'
    implementation 'com.squareup.okhttp3:okhttp:3.11.0'
    //    --------------butterknife依赖
    implementation 'com.jakewharton:butterknife:8.5.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
    implementation 'io.reactivex.rxjava2:rxjava:2.2.0'
    implementation 'io.reactivex.rxjava2:rxandroid:2.1.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
    //转换器，请求结果转换成Model
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.4.0'
    //配合Rxjava 使用
    implementation 'com.android.support:recyclerview-v7:27.1.1'
    implementation 'com.squareup.okhttp3:logging-interceptor:3.11.0'
        //fresco依赖
    implementation 'com.facebook.fresco:fresco:0.12.0'
    implementation 'com.facebook.fresco:animated-webp:0.12.0'
    implementation 'com.facebook.fresco:webpsupport:0.12.0'

提前说明：fresco需要在application里初始化，要不然报错;

Utils：

public class HttpUtils {
    private static volatile HttpUtils httpUtils;
    private final Retrofit retrofit;
    public final Api api;

    private  HttpUtils() {
        OkHttpClient httpClient = new OkHttpClient.Builder()
                .writeTimeout(3000, TimeUnit.MILLISECONDS)
                .readTimeout(3000, TimeUnit.MILLISECONDS)
                .build();
        retrofit = new Retrofit.Builder()
                .baseUrl(Contant.BASE_URI)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .client(httpClient)
                .build();
        api = retrofit.create(Api.class);
    }
    public static HttpUtils getinstener(){
        if (httpUtils == null){
            synchronized (HttpUtils.class){
                if (httpUtils == null){
                    httpUtils = new HttpUtils();
                }
            }
        }
        return httpUtils;
    }
    public <T> T create(Class<T> tClass){
        return retrofit.create(tClass);
    }
}

Api：

public interface Api {
    @GET("nba/?key=71e58b5b2f930eaf1f937407acde08fe&num=20")
    Observable<Bean> key(@Query("page") int page);
}

Contant：

public class Contant {
    public static final String BASE_URI = "http://api.tianapi.com/";
}

MVP：

View层：

IView是个空的；

public interface IMainView extends IView {
    void onsuccess(Bean bean);
    void onerror(Exception e);
}

Model层：

public class MainModel {

    public void MainModel(int page,final  Main main) {
        Observable<Bean> key = HttpUtils.getinstener().api.key(page);
        key.observeOn(AndroidSchedulers.mainThread())
                .subscribeOn(Schedulers.io())
                .subscribe(new Consumer<Bean>() {
                    @Override
                    public void accept(Bean bean) throws Exception {
                            main.success(bean);
                    }
                }, new Consumer<Throwable>() {
                    @Override
                    public void accept(Throwable throwable) throws Exception {

                    }
                });
    }
    public interface Main{
        void success(Bean bean);
        void error(Exception e);
    }
}

Presenter：

抽取basePresenter：

public abstract class BasePresenter<V extends IView> {
    protected V v;

    public BasePresenter() {
        initModel();
    }

    protected abstract void initModel();

    public void attach(V v){
        this.v = v;
    }
    protected void getdata(){
        this.v = null;
    }

}

主的presenter：

public class MainPresenter extends BasePresenter<IMainView> implements IView {

    private MainModel model;

    @Override
    protected void initModel() {
        model = new MainModel();
    }
    public void getdata(int page){
        model.MainModel(page,new MainModel.Main() {
            @Override
            public void success(Bean bean) {
                v.onsuccess(bean);
            }

            @Override
            public void error(Exception e) {
                v.onerror(e);
            }
        });
    }
}

抽取的baseActivity：

public abstract class BaseActivity<P extends BasePresenter> extends AppCompatActivity implements IView {

    protected P presenter;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutId());
        ButterKnife.bind(this);
        initView();
        presenter = getProducter();
        initAttach();
        initData();

        initListener();
    }

    private void initListener() {}

    protected abstract void initData();

    private void initAttach() {
        if (presenter != null){
            presenter.attach(this);
        }
    }

    protected abstract P getProducter();

    private void initView() {}

    protected abstract int getLayoutId();
}

主的activity：

public class MainActivity extends BaseActivity<MainPresenter> implements IMainView {

    @BindView(R.id.recycler_view)
    XRecyclerView recyclerView;
    private int page = 1;

    @Override
    protected void initData() {
        presenter.getdata(page);
    }

    @Override
    protected MainPresenter getProducter() {
        return new MainPresenter();
    }

    @Override
    protected int getLayoutId() {
        return R.layout.activity_main;
    }

    @Override
    public void onsuccess(Bean bean) {
        LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
        recyclerView.setLayoutManager(manager);
        final MainAdapter mainAdapter = new MainAdapter(MainActivity.this, bean);
        recyclerView.setAdapter(mainAdapter);
        recyclerView.setPullRefreshEnabled(true);
        recyclerView.setLoadingMoreEnabled(true);
        recyclerView.setLoadingListener(new XRecyclerView.LoadingListener() {
            @Override
            public void onRefresh() {
                page = 1;
                presenter.getdata(page);
                recyclerView.refreshComplete();
                Toast.makeText(MainActivity.this, "刷新", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onLoadMore() {
                page++;
                presenter.getdata(page);
                recyclerView.loadMoreComplete();
                Toast.makeText(MainActivity.this, "加载更多", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public void onerror(Exception e) {

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // TODO: add setContentView(...) invocation
        ButterKnife.bind(this);
    }
}