展示数据使用：recyclerview，retrofit，greendao，butterknife，eventbus，fresco。实现效果图列表。MVP模式。

实现思路必须步骤。新框架愿各位同门进行学习，思路清析一下。

一，首先添加依赖。

compile 'com.squareup.retrofit2:converter-gson:2.3.0'

implementation 'com.android.support:recyclerview-v7:26.1.0'
compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'org.greenrobot:greendao:3.2.0'
compile 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
compile 'org.greenrobot:eventbus:3.1.1'
compile 'com.facebook.fresco:fresco:1.5.0'

二。添加网络权限；

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

三。接下来就是类的创建。

1，对对数据类的封装。创建bean类。

public class Bean {/**
     * code : 200
     * msg : success
     * data : {"category":[{"id":"16","cat_name":"按功效","is_leaf":"0","children":[{"id":"17","cat_name":"补水保湿","is_leaf":"1"},{"id":"31","cat_name":"舒缓修护","is_leaf":"1"},{"id":"19","cat_name":"控油去痘","is_leaf":"1"},{"id":"18","cat_name":"美白提亮","is_leaf":"1"},{"id":"20","cat_name":"紧致抗皱","is_leaf":"1"}]},{"id":"6","cat_name":"按属性","is_leaf":"0","children":[{"id":"38","cat_name":"面膜","is_leaf":"0"},{"id":"39","cat_name":"润肤水","is_leaf":"1"},{"id":"40","cat_name":"润肤乳","is_leaf":"1"},{"id":"24","cat_name":"洁面乳","is_leaf":"0"},{"id":"35","cat_name":"其他","is_leaf":"0"},{"id":"33","cat_name":"实惠套装","is_leaf":"1"},{"id":"9","cat_name":"贴式面膜","is_leaf":"0"},{"id":"10","cat_name":"睡眠面膜","is_leaf":"0"},{"id":"23","cat_name":"泥浆面膜","is_leaf":"0"},{"id":"41","cat_name":"男士","is_leaf":"0"}]},{"id":"11","cat_name":"按肤质","is_leaf":"0","children":[{"id":"14","cat_name":"混合性肤质","is_leaf":"1"},{"id":"13","cat_name":"中性肤质","is_leaf":"1"},{"id":"29","cat_name":"干性肤质","is_leaf":"1"},{"id":"28","cat_name":"油性肤质","is_leaf":"1"},{"id":"15","cat_name":"痘痘肤质","is_leaf":"1"},{"id":"37","cat_name":"敏感肤质","is_leaf":"0"}]}],"goodsBrief":[{"id":"121","goods_name":"经典款丨美白嫩肤面膜7片","shop_price":49.9,"market_price":99,"goods_img":"https://image.yunifang.com/yunifang/images/goods/121/goods_img/17062610568378169043195978.jpg","reservable":false,"efficacy":"美白嫩肤 层层葆鲜","stock_number":0,"restrict_purchase_num":0},{"id":"684","goods_name":"解救肌渴丨花粹水润面膜套装10片","shop_price":29.9,"market_price":139,"goods_img":"https://image.yunifang.com/yunifang/images/goods/684/goods_img/17062610401397749701177609.jpg","reservable":false,"efficacy":"水润充盈 鲜嫩少女肌","stock_number":0,"restrict_purchase_num":0},{"id":"772","goods_name":"热销爆款丨清润莹亮黑膜套装21片","shop_price":99.9,"market_price":297,"goods_img":"https://image.yunifang.com/yunifang/images/goods/772/goods_img/171016095389114258195255761.jpg","reservable":false,"efficacy":"自然莹亮  水感瓷肌","stock_number":0,"restrict_purchase_num":0},{"id":"5","goods_name":"亮采金桂花眼膜贴60片","shop_price":69,"market_price":129,"goods_img":"https://image.yunifang.com/yunifang/images/goods/5/goods_img/17103118031591202108007689.jpg","reservable":false,"efficacy":"补水靓眼 改善熊猫眼","stock_number":0,"restrict_purchase_num":0},{"id":"343","goods_name":"美白嫩肤润肤水150ml","shop_price":69,"market_price":119,"goods_img":"https://image.yunifang.com/yunifang/images/goods/343/goods_img/170626103423611420000294568.jpg","reservable":false,"efficacy":"补水保湿 美白嫩肤","stock_number":0,"restrict_purchase_num":0},{"id":"9","goods_name":"玫瑰滋养矿物睡眠面膜180g","shop_price":59.9,"market_price":99,"goods_img":"https://image.yunifang.com/yunifang/images/goods/9/goods_img/170626112611018894167156705.jpg","reservable":false,"efficacy":"镇店之宝 彻夜补水","stock_number":0,"restrict_purchase_num":0},{"id":"10","goods_name":"美白嫩肤睡眠面膜180g","shop_price":69,"market_price":119,"goods_img":"https://image.yunifang.com/yunifang/images/goods/10/goods_img/170626112190919312919673075.jpg","reservable":false,"efficacy":"水润一夜 美白透亮","stock_number":0,"restrict_purchase_num":0},{"id":"446","goods_name":"芦荟补水保湿凝胶150g","shop_price":49.9,"market_price":89,"goods_img":"https://image.yunifang.com/yunifang/images/goods/446/goods_img/17112211433972519259384989.jpg","reservable":false,"efficacy":"滋养肌肤 自然水润","stock_number":0,"restrict_purchase_num":0},{"id":"16","goods_name":"玫瑰滋养保湿四件套","shop_price":169.9,"market_price":259.9,"goods_img":"https://image.yunifang.com/yunifang/images/goods/16/goods_img/17062611152592656236701367.jpg","reservable":false,"efficacy":"一整套源源补水","stock_number":0,"restrict_purchase_num":0},{"id":"8","goods_name":"全新升级丨美白嫩肤面膜20片","shop_price":129.9,"market_price":359,"goods_img":"https://image.yunifang.com/yunifang/images/goods/8/goods_img/170818182578717903477668239.jpg","reservable":false,"efficacy":"真美白 匠心造","stock_number":0,"restrict_purchase_num":0},{"id":"14","goods_name":"矿物泥浆鼻膜60g","shop_price":55,"market_price":69,"goods_img":"https://image.yunifang.com/yunifang/images/goods/14/goods_img/170626111762918631255244111.jpg","reservable":false,"efficacy":"收敛毛孔 改善黑头","stock_number":0,"restrict_purchase_num":0},{"id":"189","goods_name":"清爽平衡护肤三件套","shop_price":99.9,"market_price":179.9,"goods_img":"https://image.yunifang.com/yunifang/images/goods/189/goods_img/1706261046499486999388441.jpg","reservable":false,"efficacy":"深层清洁 平衡水油","stock_number":0,"restrict_purchase_num":0},{"id":"11","goods_name":"清爽平衡矿物泥浆面膜260g","shop_price":99,"market_price":99,"goods_img":"https://image.yunifang.com/yunifang/images/goods/11/goods_img/170626112085420599974158029.jpg","reservable":false,"efficacy":"口碑泥浆 清爽控油","stock_number":0,"restrict_purchase_num":0},{"id":"4","goods_name":"黑玫瑰矿物洁面乳100ml","shop_price":49,"market_price":59,"goods_img":"https://image.yunifang.com/yunifang/images/goods/4/goods_img/17062611262464209534577694.jpg","reservable":false,"efficacy":"温和清洁 提亮肤色","stock_number":0,"restrict_purchase_num":0},{"id":"559","goods_name":"竹炭净透矿物泥浆面膜110g","shop_price":59,"market_price":99,"goods_img":"https://image.yunifang.com/yunifang/images/goods/559/goods_img/170627164784010618075663103.jpg","reservable":false,"efficacy":"控油净肤 细腻毛孔","stock_number":0,"restrict_purchase_num":0}]}
     */

    private int code;private String msg;private DataBean data;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 DataBean getData() {return data;}public void setData(DataBean data) {this.data = data;}public static class DataBean {private List<CategoryBean> category;private List<GoodsBriefBean> goodsBrief;public List<CategoryBean> getCategory() {return category;}public void setCategory(List<CategoryBean> category) {this.category = category;}public List<GoodsBriefBean> getGoodsBrief() {return goodsBrief;}public void setGoodsBrief(List<GoodsBriefBean> goodsBrief) {this.goodsBrief = goodsBrief;}public static class CategoryBean {/**
             * id : 16
             * cat_name : 按功效
             * is_leaf : 0
             * children : [{"id":"17","cat_name":"补水保湿","is_leaf":"1"},{"id":"31","cat_name":"舒缓修护","is_leaf":"1"},{"id":"19","cat_name":"控油去痘","is_leaf":"1"},{"id":"18","cat_name":"美白提亮","is_leaf":"1"},{"id":"20","cat_name":"紧致抗皱","is_leaf":"1"}]
             */

            private String id;private String cat_name;private String is_leaf;private List<ChildrenBean> children;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getCat_name() {return cat_name;}public void setCat_name(String cat_name) {this.cat_name = cat_name;}public String getIs_leaf() {return is_leaf;}public void setIs_leaf(String is_leaf) {this.is_leaf = is_leaf;}public List<ChildrenBean> getChildren() {return children;}public void setChildren(List<ChildrenBean> children) {this.children = children;}public static class ChildrenBean {/**
                 * id : 17
                 * cat_name : 补水保湿
                 * is_leaf : 1
                 */

                private String id;private String cat_name;private String is_leaf;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getCat_name() {return cat_name;}public void setCat_name(String cat_name) {this.cat_name = cat_name;}public String getIs_leaf() {return is_leaf;}public void setIs_leaf(String is_leaf) {this.is_leaf = is_leaf;}}}}
}
2.创建连接bean—— GoodsBriefBean 类。

public  class GoodsBriefBean {/**
     * id : 121
     * goods_name : 经典款丨美白嫩肤面膜7片
     * shop_price : 49.9
     * market_price : 99.0
     * goods_img : https://image.yunifang.com/yunifang/images/goods/121/goods_img/17062610568378169043195978.jpg
     * reservable : false
     * efficacy : 美白嫩肤 层层葆鲜
     * stock_number : 0
     * restrict_purchase_num : 0
     */
    @Id(autoincrement = true)private Long iid;private String id;private String goods_name;private double shop_price;private double market_price;private String goods_img;private boolean reservable;private String efficacy;private int stock_number;private int restrict_purchase_num;public GoodsBriefBean() {}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getGoods_name() {return goods_name;}public void setGoods_name(String goods_name) {this.goods_name = goods_name;}public double getShop_price() {return shop_price;}public void setShop_price(double shop_price) {this.shop_price = shop_price;}public double getMarket_price() {return market_price;}public void setMarket_price(double market_price) {this.market_price = market_price;}public String getGoods_img() {return goods_img;}public void setGoods_img(String goods_img) {this.goods_img = goods_img;}public boolean isReservable() {return reservable;}public void setReservable(boolean reservable) {this.reservable = reservable;}public String getEfficacy() {return efficacy;}public void setEfficacy(String efficacy) {this.efficacy = efficacy;}public int getStock_number() {return stock_number;}public void setStock_number(int stock_number) {this.stock_number = stock_number;}public int getRestrict_purchase_num() {return restrict_purchase_num;}public void setRestrict_purchase_num(int restrict_purchase_num) {this.restrict_purchase_num = restrict_purchase_num;}public Long getIid() {return this.iid;}public void setIid(Long iid) {this.iid = iid;}public boolean getReservable() {return this.reservable;}
}

3.创建参数Bean。

public class EventBean {public String url;public String title;public EventBean(String url, String title) {this.url = url;this.title = title;}public String getUrl() {return url;}public String getTitle() {return title;}
}

4， IApplication初始化类的创建。

public class IApplication extends Application {public static IGetDataBase iGetDataBase;public static DaoSession session;@Override
    public void onCreate() {super.onCreate();Fresco.initialize(this);Retrofit retrofit = new Retrofit.Builder().baseUrl("http://m.yunifang.com").addConverterFactory(GsonConverterFactory.create()).build();iGetDataBase = retrofit.create(IGetDataBase.class);DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this,"test1");Database database =  helper.getWritableDb();session = new DaoMaster(database).newSession();}
}

三，实现Model包中的类。

1，第一步创建MainModel接口·

    public interface MainModel {}

2，创建 MainModelImpl类。

public class MainModelImpl {/**
     * get 请求
     * @param callBack
     */
    public void getData(final ModelCallBack callBack){Call<Bean> call = IApplication.iGetDataBase.get("96333","bf3386e14fe5bb0bcef234baebca2414");call.enqueue(new Callback<Bean>() {@Override
           public void onResponse(Call<Bean> call, Response<Bean> response) {Bean bean = response.body();callBack.onSuccess(bean);IApplication.session.getGoodsBriefBeanDao().insertInTx(bean.getData().getGoodsBrief());}@Override
           public void onFailure(Call<Bean> call, Throwable t) {callBack.onFailure(new Exception(""));}});}/**
     * post 请求
     */
    public void  postData(final ModelCallBack callBack){Call<Bean> call = IApplication.iGetDataBase.get("96333","bf3386e14fe5bb0bcef234baebca2414");call.enqueue(new Callback<Bean>() {@Override

            public void onResponse(Call<Bean> call, Response<Bean> response) {Bean bean = response.body();callBack.onSuccess(bean);}@Override
            public void onFailure(Call<Bean> call, Throwable t) {callBack.onFailure(new Exception("") );}});}
}

3，创建ModelCallBack接口。

public interface ModelCallBack {public void onSuccess(Bean bean);public void onFailure(Exception e);}

四。实现presenter包中的类。

    1，创建MainPresenter类。

public class MainPresenter {private IMainView iView ;private MainModelImpl mainModel ;public MainPresenter(IMainView view){this.iView = view;this.mainModel = new MainModelImpl();}public void get(){mainModel.getData(new ModelCallBack() {@Override
            public void onSuccess(Bean bean) {if(iView != null){iView.onSuccess(bean);}}@Override
            public void onFailure(Exception e) {if(iView != null){iView.onFailure(e);}}});}public void post(){mainModel.postData(new ModelCallBack() {@Override
            public void onSuccess(Bean bean) {if(iView != null){iView.onSuccess(bean);}}@Override
            public void onFailure(Exception e) {if(iView != null){iView.onFailure(e);}}});}}

五。实现view包中类。

1，创建IMainView类。

public interface IMainView {public void onSuccess(Bean bean);public void onFailure(Exception e);
}

六。创建adapter得类。

创建IApdater适配器类。

public class IApdater extends RecyclerView.Adapter<IApdater.IViewHolder>{Context context;List<GoodsBriefBean> list ;public IApdater(Context context) {this.context = context;}public void addData(Bean bean){if(list == null){list = new ArrayList<>();}list.addAll(bean.getData().getGoodsBrief());notifyDataSetChanged();}@Override
    public IApdater.IViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = View.inflate(context, R.layout.layout, null);return new IViewHolder(view);}@Override
    public void onBindViewHolder(IApdater.IViewHolder holder, final int position) {//holder.adapterSimpledraweeview.setImageURI("https://image.yunifang.com/yunifang/images/goods/121/goods_img/17062610568378169043195978.jpg");
        holder.adapterSimpledraweeview.setImageURI(list.get(position).getGoods_img());holder.adapterTextview.setText(list.get(position).getGoods_name());holder.adapterTextview.setOnClickListener(new View.OnClickListener() {@Override
            public void onClick(View view) {EventBus.getDefault().postSticky(new EventBean(list.get(position).getGoods_img(),list.get(position).getGoods_name()));context.startActivity(new Intent(context, Main2Activity.class));}});}@Override
    public int getItemCount() {return list == null ? 0 : list.size();}static class IViewHolder  extends RecyclerView.ViewHolder{@BindView(R.id.adapter_simpledraweeview)SimpleDraweeView adapterSimpledraweeview;@BindView(R.id.adapter_textview)TextView adapterTextview;IViewHolder(View view) {super(view);ButterKnife.bind(this, view);}}
}

七。创建MainActivity类。

public class MainActivity extends Activity implements IMainView {@BindView(R.id.recycleview)RecyclerView recycleview;private MainPresenter presenter;private IApdater adapter;@Override
    protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ButterKnife.bind(this);presenter = new MainPresenter(this);presenter.get();LinearLayoutManager manager = new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);adapter = new IApdater(this);recycleview.setLayoutManager(manager);recycleview.setAdapter(adapter);List<GoodsBriefBean> listBeans =  IApplication.session.getGoodsBriefBeanDao().loadAll();for(GoodsBriefBean bean : listBeans){System.out.println(bean.toString());}}@Override
    public void onSuccess(Bean bean) {adapter.addData(bean);}@Override
    public void onFailure(Exception e) {}
}

八。创建IGetDataBase请求接口。

      1，activity布局。

public interface IGetDataBase {//random=96333&encode=bf3386e14fe5bb0bcef234baebca2414
    @GET("/yunifang/mobile/category/list")Call<Bean> get(@Query("random") String key,@Query("encode") String encode);/**
     * post 璇锋眰
     * @param key
     * @return
     */
    @FormUrlEncoded
    @POST("/weixin/query")Call<Bean> post(@Field("key") String key);}

九。最后添加两布局。

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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.example.lianxizongjie.MainActivity"><android.support.v7.widget.RecyclerView
        android:id="@+id/recycleview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
</android.support.constraint.ConstraintLayout>

2.条目布局创建laout。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:layout_height="match_parent">
<com.facebook.drawee.view.SimpleDraweeView
    android:id="@+id/adapter_simpledraweeview"
    android:layout_width="100dp"
    android:layout_height="100dp" /><TextView
        android:id="@+id/adapter_textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

这就完成了数据显示。

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