android+MVP+Retrofit+RxJava做网络请求

1.MVP+Retrofit+RxJava做网络请求2.GreenDao把第一页的数据缓存到数据库，列表实现上拉加载更多，下拉刷新功能

3.列表中的图片(img字段)使用Fresco进行加载

4.RecyclerView列表适配器做优化

上面是需求，下面奉献上代码

1.依赖：

compile 'com.squareup.retrofit2:retrofit:2.0.1'
compile 'com.squareup.retrofit2:converter-gson:2.0.1'
compile 'com.squareup.retrofit2:adapter-rxjava:2.0.1'
compile 'io.reactivex:rxandroid:1.1.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
compile 'com.jcodecraeer:xrecyclerview:1.3.2'
// Fresco所需依赖
compile 'com.facebook.fresco:fresco:0.12.0'

2.创建MVP包

model包下创建

ApiService接口

package bawei.com.app1.model;import java.util.List;import bawei.com.app1.bean.Bean;
import retrofit2.http.GET;
import retrofit2.http.Url;
import rx.Observable;/**
 * Created by Administrator on 2017/11/12.
 */

public interface ApiService {@GET
    Observable<List<Bean>> getpage(@Url String url);
}

Imodel接口

package bawei.com.app1.model;/**
 * Created by Administrator on 2017/11/12.
 */

public interface Imodel {void getpage(String url);
}

PageModel类

package bawei.com.app1.model;import java.util.List;import bawei.com.app1.bean.Bean;
import bawei.com.app1.presenter.Api;
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;/**
 * Created by TA on 2017/11/11.
 */

public class PageModel implements Imodel {private OnFinish onFinish ;public interface  OnFinish{void OnFinishListener(List<Bean.DataBean> list);}public void setOnFinish(OnFinish onFinish ){this.onFinish = onFinish;}@Override
    public void getpage(String url) {Retrofit retrofit  = new Retrofit.Builder().baseUrl(Api.url).addConverterFactory(GsonConverterFactory.create()).addCallAdapterFactory(RxJavaCallAdapterFactory.create()).build();ApiService apiService = retrofit.create(ApiService.class);Observable<List<Bean>> page = apiService.getpage(url);page.subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Observer<List<Bean>>() {@Override
                    public void onCompleted() {}@Override
                    public void onError(Throwable e) {}@Override
                    public void onNext(List<Bean> bean) {List<Bean.DataBean> data = bean.get(0).getData();onFinish.OnFinishListener(data);}});}
}

view包下

Iview接口

package bawei.com.app1.view;import java.util.List;import bawei.com.app1.bean.Bean;/**
 * Created by Administrator on 2017/11/12.
 */

public interface Iview {void getpage(List<Bean.DataBean> list);
}

XrAdapter类

package bawei.com.app1.view;import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;import com.facebook.drawee.view.SimpleDraweeView;
import com.jcodecraeer.xrecyclerview.XRecyclerView;import java.util.List;import bawei.com.app1.R;
import bawei.com.app1.bean.Bean;/**
 * Created by Administrator on 2017/11/12.
 */

public class XrAdapter extends XRecyclerView.Adapter<XrAdapter.ViewHolder> {Context context;List<Bean.DataBean> list;public XrAdapter(Context context, List<Bean.DataBean> list) {this.context = context;this.list = list;}@Override
    public XrAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {//给Adapter添加布局，bq把这个view传递给HoldView，让HoldView找到空间
        View view= LayoutInflater.from(context).inflate(R.layout.xr_item, parent,false);ViewHolder holdView=new ViewHolder(view);return holdView;}@Override
    public void onBindViewHolder(XrAdapter.ViewHolder holder, int position) {holder.iv.setImageURI(list.get(position).getImg());holder.tv.setText(list.get(position).getTitle());}@Override
    public int getItemCount() {return list.size();}public class ViewHolder extends RecyclerView.ViewHolder {private final TextView tv;private final SimpleDraweeView iv;public ViewHolder(View itemView) {super(itemView);tv = itemView.findViewById(R.id.tv);iv = itemView.findViewById(R.id.iv);}}
}

presnter包下

Api类

PagePresenter类

package bawei.com.app1.presenter;import java.util.List;import bawei.com.app1.bean.Bean;
import bawei.com.app1.model.PageModel;
import bawei.com.app1.view.Iview;/**
 * Created by Administrator on 2017/11/12.
 */

public class PagePresenter implements PageModel.OnFinish{private final Iview iview;private final PageModel pageModel ;public PagePresenter(Iview iview) {this.iview = iview;this.pageModel = new PageModel() ;}public void getpage(String url){pageModel.setOnFinish(this);pageModel.getpage(url);}@Override
    public void OnFinishListener(List<Bean.DataBean> list) {iview.getpage(list);}
}

MyApp类

package bawei.com.app1;import android.app.Application;import com.facebook.drawee.backends.pipeline.Fresco;public class MyApp extends Application {@Override
    public void onCreate() {super.onCreate();Fresco.initialize(this);}
}

MainActivity类

package bawei.com.app1;import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.widget.Toast;import com.jcodecraeer.xrecyclerview.XRecyclerView;import java.util.List;import bawei.com.app1.bean.Bean;
import bawei.com.app1.presenter.PagePresenter;
import bawei.com.app1.view.Iview;
import bawei.com.app1.view.XrAdapter;public class MainActivity extends AppCompatActivity implements Iview {private XRecyclerView xr;private XrAdapter xa;int page = 1;String url = "wap/data/news/txs/page_1.json";@Override
    protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {final PagePresenter pagePresenter  = new PagePresenter(this) ;pagePresenter.getpage(url);xr = (XRecyclerView) findViewById(R.id.xr);LinearLayoutManager layoutManager=new LinearLayoutManager(this);layoutManager.setOrientation(LinearLayoutManager.VERTICAL);xr.setLayoutManager(layoutManager);xr.setLoadingListener(new XRecyclerView.LoadingListener() {@Override
            public void onRefresh() {page=1;url = "wap/data/newss/page_" + page + ".json";pagePresenter.getpage(url);xa.notifyDataSetChanged();Toast.makeText(MainActivity.this , "刷新成功！" , Toast.LENGTH_SHORT).show();xr.refreshComplete();}@Override
            public void onLoadMore() {page++;url = "wap/data/news/txs/page_"+page+".json";pagePresenter.getpage(url);//  xa.notifyDataSetChanged();
                Toast.makeText(MainActivity.this , "加载成功！" , Toast.LENGTH_SHORT).show();xr.loadMoreComplete();}});}@Override
    public void getpage(List<Bean.DataBean> list) {xa = new XrAdapter(this , list);xr.setAdapter(xa);}
}
Bean类

android:name=".MyApp"
这句话必须加否则会没有数据的

package bawei.com.app1.bean;import java.util.List;/**
 * Created by TA on 2017/11/11.
 */

public class Bean {/**
     * data : [{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510358537754.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239715.json","countid":20009,"id":"239715","title":"【环球】道指终结八周连涨走势 迅雷收涨近40%","otime":"2017-11-11 08:02:40","source":"","views":"1085","resType":"置顶"},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510360081605.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239719.json","countid":20009,"id":"239719","title":"互金协会：从事外汇、贵金属等杠杆交易的网络平台属非法设立","otime":"2017-11-11 08:29:40","source":"","views":"14","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510359764521.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239718.json","countid":20009,"id":"239718","title":"国土部整顿70城囤地行为：严打坐地生财 苏州被点名","otime":"2017-11-11 08:23:40","source":"","views":"11","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510359068238.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239717.json","countid":20009,"id":"239717","title":"第六轮脱欧谈判无果而终 欧盟要求英国两周破局","otime":"2017-11-11 08:16:55","source":"","views":"17","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510358907282.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239716.json","countid":20009,"id":"239716","title":"黄金再现神秘天量交易 10分钟内400万盎司砸盘","otime":"2017-11-11 08:16:25","source":"","views":"127","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510321834470.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239713.json","countid":20009,"id":"239713","title":"11月10日晚间财经要闻&公告精选汇总","otime":"2017-11-10 21:56:03","source":"","views":"67611","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510318706602.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239712.json","countid":20009,"id":"239712","title":"5G概念股牛气冲天，但这几只股更牛，你可能已经想到了！","otime":"2017-11-10 20:58:50","source":"","views":"81532","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510317235707.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239711.json","countid":20009,"id":"239711","title":"证监会核发7家企业IPO批文，筹资总金额不超过32亿元","otime":"2017-11-10 20:34:10","source":"","views":"59553","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510317079914.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239710.json","countid":20009,"id":"239710","title":"证监会：今日5家公司首发上会3家过会","otime":"2017-11-10 20:32:20","source":"","views":"22955","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510313338777.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239708.json","countid":20009,"id":"239708","title":"复星：郭广昌辞任复星高科董事长，但仍是复星集团董事长","otime":"2017-11-10 19:30:17","source":"","views":"20216","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510312053854.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239705.json","countid":20009,"id":"239705","title":"乐视网：贾跃亭称已将减持所得资金全部用于非上市体系以及本人所涉及的债务偿付等","otime":"2017-11-10 19:08:00","source":"","views":"53189","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510311245055.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239704.json","countid":20009,"id":"239704","title":"上交所发布《关于做好落实减持新规相关信息填报工作的通知》","otime":"2017-11-10 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18:29:09","source":"","views":"86312","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510309350965.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239697.json","countid":20009,"id":"239697","title":"投保基金：10月证券市场投资者信心指数53.8，环比下降7.4%","otime":"2017-11-10 18:28:36","source":"","views":"17122","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510306033350.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239691.json","countid":20009,"id":"239691","title":"媒体：证监会三大机制严管IPO审核，交易所将介入现场检查","otime":"2017-11-10 17:27:46","source":"","views":"33174","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510304856330.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239688.json","countid":20009,"id":"239688","title":"十大博客看后市：A股赚大钱的机会来了！","otime":"2017-11-10 18:30:40","source":"","views":"160270","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510304786745.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239687.json","countid":20009,"id":"239687","title":"昨晚说要增持，今早就涨停，增持计划那么神？这些行为你要小心！","otime":"2017-11-10 19:30:57","source":"","views":"150834","resType":""},{"summary":"","img":"http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510304675355.jpg","advTypeShare":"","url":"http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239686.json","countid":20009,"id":"239686","title":"双11物流大战提前开打，各大电商都有哪些杀手锏？","otime":"2017-11-10 17:23:54","source":"","views":"17369","resType":""}]
     * header : {"pagesize":20,"last":"page_10.json","pre":"page_1.json","next":"page_2.json","totalsize":186,"first":"page_1.json","totalpage":10}
     */

    private HeaderBean header;private List<DataBean> data;public HeaderBean getHeader() {return header;}public void setHeader(HeaderBean header) {this.header = header;}public List<DataBean> getData() {return data;}public void setData(List<DataBean> data) {this.data = data;}public static class HeaderBean {/**
         * pagesize : 20
         * last : page_10.json
         * pre : page_1.json
         * next : page_2.json
         * totalsize : 186
         * first : page_1.json
         * totalpage : 10
         */

        private int pagesize;private String last;private String pre;private String next;private int totalsize;private String first;private int totalpage;public int getPagesize() {return pagesize;}public void setPagesize(int pagesize) {this.pagesize = pagesize;}public String getLast() {return last;}public void setLast(String last) {this.last = last;}public String getPre() {return pre;}public void setPre(String pre) {this.pre = pre;}public String getNext() {return next;}public void setNext(String next) {this.next = next;}public int getTotalsize() {return totalsize;}public void setTotalsize(int totalsize) {this.totalsize = totalsize;}public String getFirst() {return first;}public void setFirst(String first) {this.first = first;}public int getTotalpage() {return totalpage;}public void setTotalpage(int totalpage) {this.totalpage = totalpage;}}public static class DataBean {/**
         * summary :
         * img : http://mnews.gw.com.cn/wap/style/data/news/txs/images/1510358537754.jpg
         * advTypeShare :
         * url : http://mnews.gw.com.cn/wap/data/news/txs/2017/11/239715.json
         * countid : 20009
         * id : 239715
         * title : 【环球】道指终结八周连涨走势 迅雷收涨近40%
         * otime : 2017-11-11 08:02:40
         * source :
         * views : 1085
         * resType : 置顶
         */

        private String summary;private String img;private String advTypeShare;private String url;private int countid;private String id;private String title;private String otime;private String source;private String views;private String resType;public String getSummary() {return summary;}public void setSummary(String summary) {this.summary = summary;}public String getImg() {return img;}public void setImg(String img) {this.img = img;}public String getAdvTypeShare() {return advTypeShare;}public void setAdvTypeShare(String advTypeShare) {this.advTypeShare = advTypeShare;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public int getCountid() {return countid;}public void setCountid(int countid) {this.countid = countid;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getOtime() {return otime;}public void setOtime(String otime) {this.otime = otime;}public String getSource() {return source;}public void setSource(String source) {this.source = source;}public String getViews() {return views;}public void setViews(String views) {this.views = views;}public String getResType() {return resType;}public void setResType(String resType) {this.resType = resType;}}
}
布局：
activity_main

最后清单文件加权限

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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
    android:layout_width="match_parent" android:layout_height="match_parent"

    tools:context="bawei.com.app1.MainActivity"><com.jcodecraeer.xrecyclerview.XRecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/xr"
        ></com.jcodecraeer.xrecyclerview.XRecyclerView>
</RelativeLayout>

xr_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    xmlns:fresco="http://schemas.android.com/apk/res-auto">
<com.facebook.drawee.view.SimpleDraweeView
    android:id="@+id/iv"
    android:layout_width="100dp"
    android:layout_height="100dp"
    fresco:actualImageScaleType="focusCrop"
    fresco:failureImage="@mipmap/ic_launcher"
    fresco:failureImageScaleType="centerInside"
    fresco:placeholderImage="@mipmap/ic_launcher"
    fresco:placeholderImageScaleType="fitCenter"
    fresco:progressBarAutoRotateInterval="1000"
    fresco:progressBarImage="@mipmap/ic_launcher"
    fresco:progressBarImageScaleType="centerInside"
    fresco:retryImage="@mipmap/ic_launcher"
    fresco:retryImageScaleType="centerCrop"
    fresco:roundAsCircle="false"
    fresco:viewAspectRatio="1.6" /><TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@+id/iv"
        android:layout_toEndOf="@+id/iv"
        android:layout_marginLeft="18dp"
        android:layout_marginStart="18dp" />
</LinearLayout>

package bawei.com.app1.presenter;/**
 * Created by Administrator on 2017/11/12.
 */

public class Api {public static final String url = "http://mnews.gw.com.cn/";
}

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