XRecyclerview+retrofit+rxjava+fresco+MVP实现上拉加载更多，下拉刷新

依赖

compile 'io.reactivex:rxjava:1.3.4'
    compile 'io.reactivex:rxandroid:1.2.1'

    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.3.0'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.3.0-beta4'

    compile 'com.squareup.okhttp3:okhttp:3.9.0'
//compile project(':xrecyclerview')

    compile 'com.facebook.fresco:fresco:0.12.0'//fresco

    compile 'com.jcodecraeer:xrecyclerview:1.3.2'//xrecyclerview

权限

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

工具类

public class RetrofitUtils {
    //用来修饰被不同线程访问和修改的变量,作为指令关键字，确保本条指令不会因编译器的优化而省略，且要求每次直接读值。
    private static volatile RetrofitUtils instance;

    private Retrofit retrofit;
    //提供有参无参构造
    private RetrofitUtils(){

    }
    private RetrofitUtils(String baseUrl){
        //新建OkClient对象
        OkHttpClient client=new OkHttpClient();
        retrofit = new Retrofit.Builder()
                .client(client)
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .addConverterFactory(GsonConverterFactory.create())
                .baseUrl(baseUrl)
                .build();
    }
//有参
    public static RetrofitUtils getInstance(String baseUrl){
        //判断
        if(instance==null){
            synchronized (RetrofitUtils.class){
                //再次判断
                if(null==instance){
                    instance=new RetrofitUtils(baseUrl);
                }
            }
        }
        return instance;
    }
//无参
public static RetrofitUtils getInstance(){
        //判断
    if(null==instance){
        //http://api.tianapi.com/nba/?key=71e58b5b2f930eaf1f937407acde08fe&num=10
        return getInstance("http://api.tianapi.com/");
    }
    return instance;
}
//
    public Retrofit getRetrofit(){
        return retrofit;
    }

}

	BlogService接口

public interface BlogService {

    //http://api.tianapi.com/nba/?key=71e58b5b2f930eaf1f937407acde08fe&num=10
    @GET("nba/")
    Observable<JavaBean> getUrl(@Query("key") String key, @Query("num") int num);
}

Bean类

public class JavaBean {

    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 {
        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;
        }
    }
}

	Presenter类

public class Presenter {

    private Subscription subscribe;
    private DataView dataView;

    //提供v层构造方法,建立关联
    public void attachView(DataView dataView){
        this.dataView = dataView;
    }
/*
* Schedulers.newThread(): 总是启用新线程，并在新线程执行操作。
*  Schedulers.io()     io() 的内部实现是是用一个无数量上限的线程池，
*  可以重用空闲的线程
*  ，因此多数情况下 io() 比 newThread() 更有效率
* */
    //定义方法
    public void getData(String key,int num) {
        Retrofit retrofit = RetrofitUtils.getInstance().getRetrofit();
        BlogService service = retrofit.create(BlogService.class);
        subscribe = service.getUrl(key, num)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Action1<JavaBean>() {
                    @Override
                    public void call(JavaBean javaBean) {
                        List<JavaBean.NewslistBean> list = javaBean.getNewslist();
                        dataView.success(list);
                    }
                }, new Action1<Throwable>() {
                    @Override
                    public void call(Throwable throwable) {

                    }
                });

    }
    //提供取消关联
    public void detachView(){
        //当activity销毁时取消定阅防止内存泄漏
        if(subscribe!=null){
            //判断当前订阅状态
            if(subscribe.isUnsubscribed()){
                //取消订阅
                subscribe.unsubscribe();
            }
        }
        //如果view不为空，置为空
        if(dataView!=null){
            dataView=null;
        }

    }


}

	DataView类

public interface DataView {
    void success(List<JavaBean.NewslistBean> data);
    void failed();
}

	MainActivity类

public class MainActivity extends AppCompatActivity {
    private List<JavaBean.NewslistBean> list = new ArrayList<>();//用于存储数据
    private int num;
    private String key="71e58b5b2f930eaf1f937407acde08fe";
    private XRecyclerView xre_view;
    private Presenter presenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找到控件
        xre_view = findViewById(R.id.xre_view);
        //为xre_view设置控制器
        LinearLayoutManager manager=new LinearLayoutManager(MainActivity.this);
        xre_view.setLayoutManager(manager);
        //初始化fresco
        Fresco.initialize(this);
        //调用方法
        getData(num);
        xre_view.setPullRefreshEnabled(true);
        xre_view.setLoadingMoreEnabled(true);
        //刷新
        xre_view.setRefreshProgressStyle(ProgressStyle.BallSpinFadeLoader);
        //加载更多
        xre_view.setLoadingMoreProgressStyle(ProgressStyle.Pacman);
        //为xre_view设置监听
        /*
        * 刷新
        * */
        xre_view.setLoadingListener(new XRecyclerView.LoadingListener() {
            @Override
            public void onRefresh() {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        num=10;
                        getData(num);
                        //刷新后关闭头布局消失
                        xre_view.refreshComplete();
                    }
                },2000);
            }
        /*
        * 加载更多
        * */
            @Override
            public void onLoadMore() {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        num+=10;
                        getData(num);
                        xre_view.refreshComplete();//关闭尾布局
                    }
                },2000);
            }
        });

    }

    private void getData(int num) {
        //创建p层对象
        presenter = new Presenter();
        presenter.getData(key,num);
        //调用v接口的方法要实现v
        presenter.attachView(new DataView(){

            private MyAdapter adapter;

            @Override
            public void success(List<JavaBean.NewslistBean> data) {

                Log.d("--", "success: "+data.size());

                list.clear();
                list.addAll(data);

                if (adapter==null){
                    adapter = new MyAdapter(MainActivity.this,data);
                    xre_view.setAdapter(adapter);
                }else {
                    adapter.notifyDataSetChanged();
                }
            }

            @Override
            public void failed() {

            }
        });

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //判断p是否为空
        if(presenter!=null){
            presenter.detachView();//解除绑定
        }
    }
}

	MyAdapter代码

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
    Context context;
    List<JavaBean.NewslistBean> data;
    private XRecyViewHolder xRecyViewHolder;

    public MyAdapter(Context context, List<JavaBean.NewslistBean> data) {
        this.data=data;
        this.context=context;

    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view=View.inflate(context,R.layout.xre_item,null);
        //把自定义布局和布局绑定
        xRecyViewHolder = new XRecyViewHolder(view);
        return xRecyViewHolder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        //把自定义holder和自带的绑定
        xRecyViewHolder= (XRecyViewHolder) holder;
        xRecyViewHolder.re_text.setText(data.get(position).getTitle());
        xRecyViewHolder.re_img.setImageURI(data.get(position).getPicUrl());
    }

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

        private final TextView re_text;
        private final SimpleDraweeView re_img;

        public XRecyViewHolder(View itemView) {
            super(itemView);
            //找到控件
            re_text = itemView.findViewById(R.id.xre_text);
            re_img = itemView.findViewById(R.id.xre_fresco);
        }
    }
}

	activity_main.xml布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="com.example.com.recy_rxjava_fresco_retrofit.MainActivity">
<com.jcodecraeer.xrecyclerview.XRecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/xre_view">

</com.jcodecraeer.xrecyclerview.XRecyclerView>


</LinearLayout>

	xre_item.xml布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="horizontal"
    xmlns:fresco="http://schemas.android.com/apk/res-auto"
    tools:context="com.example.com.recy_rxjava_fresco_retrofit.MainActivity">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/xre_text"
    android:text="aaaa"/>
    <com.facebook.drawee.view.SimpleDraweeView
        android:layout_width="100dp"
        android:layout_height="100dp"
        fresco:roundAsCircle="true"
        android:id="@+id/xre_fresco"/>


</LinearLayout>

XRecyclerview+retrofit+rxjava+fresco+MVP实现上拉加载更多，下拉刷新

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