分类实现

 compile 'com.github.bumptech.glide:glide:3.7.0'    compile 'com.youth.banner:banner:+'    compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'    compile 'com.facebook.fresco:fresco:0.11.0'    compile 'io.reactivex:rxjava:1.0.14'    compile 'io.reactivex:rxandroid:1.0.1'    compile 'com.squareup.retrofit2:converter-gson:2.0.1'    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.1'    compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'    compile 'com.squareup.okhttp3:okhttp:3.1.2'    compile 'com.squareup.retrofit2:retrofit:2.0.1'

IFenView

public interface IFenView {    void onZuo(Zean zean);//左侧请求成功    void onYou(Yean yean);//右侧请求成功}

FenModel

public class FenModel {    ScuMod scuMod;    public void setScuMod(ScuMod scuMod) {        this.scuMod = scuMod;    }    //左面请求    public void ZuoChen(){        //OkHttp里面可以添加拦截器        OkHttpClient ok = new OkHttpClient.Builder()                .build();        //请求数据        RetrofitUnitl.getInstance("https://www.zhaoapi.cn/",ok)                .setCreate(Inters.class)                .Zuo()                .observeOn(AndroidSchedulers.mainThread())                .subscribeOn(Schedulers.io())                .subscribe(new Subscriber<Zean>() {                    @Override                    public void onCompleted() {                    }                    @Override                    public void onError(Throwable e) {                    }                    @Override                    public void onNext(Zean bean) {                        scuMod.Zc(bean);                    }                });    }    //右面请求    public void YuoChen(int cont){        //OkHttp里面可以添加拦截器        OkHttpClient ok = new OkHttpClient.Builder()                .build();        //请求数据        RetrofitUnitl.getInstance("https://www.zhaoapi.cn/",ok)                .setCreate(Inters.class)                .You(cont)                .observeOn(AndroidSchedulers.mainThread())                .subscribeOn(Schedulers.io())                .subscribe(new Subscriber<Yean>() {                    @Override                    public void onCompleted() {                    }                    @Override                    public void onError(Throwable e) {                    }                    @Override                    public void onNext(Yean bean) {                        scuMod.Yc(bean);                    }                });    }    //定义一个接口    public interface ScuMod{        void Zc(Zean bean);        void Yc(Yean yean);    }}

FenPresenter

public class FenPresenter implements FenModel.ScuMod {    IFenView view;    FenModel model;    public FenPresenter(IFenView view) {        this.view = view;        model = new FenModel();        model.setScuMod(this);    }    @Override    public void Zc(Zean bean) {        view.onZuo(bean);    }    @Override    public void Yc(Yean yean) {        view.onYou(yean);    }    //左侧调用    public void  ShowPer(){        model.ZuoChen();    }    // 右侧调用    public void FlShowYou(int cont){        model.YuoChen(cont);    }}

Inters

public interface Inters {    @GET("product/getCatagory")    Observable<Zean> Zuo();    /**     * 右面接口     */    @GET("product/getProductCatagory")    Observable<Yean> You(@Query("cid") int cid);}

ErAdapter 二级列表的适配器

public class ErAdapter extends BaseExpandableListAdapter {    private Context context;    private Yean yean;    public ErAdapter(Context context, Yean yean) {        this.context = context;        this.yean = yean;    }    @Override    public int getGroupCount() {        return yean.getData().size();    }    @Override    public int getChildrenCount(int i) {        return 1;    }    @Override    public Object getGroup(int i) {        return yean.getData().get(i);    }    @Override    public Object getChild(int i, int i1) {        return yean.getData().get(i).getList().get(i);    }    @Override    public long getGroupId(int i) {        return i;    }    @Override    public long getChildId(int i, int i1) {        return i1;    }    @Override    public boolean hasStableIds() {        return false;    }    @Override    public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {        //父级        View v = View.inflate(context, R.layout.you_litem, null);        TextView expand_tv = v.findViewById(R.id.you_you);        expand_tv.setText(yean.getData().get(i).getName());        return v;    }    @Override    public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {        //嵌套RecyclerView的布局        View v = View.inflate(context,R.layout.youhai_litem,null);        RecyclerView expand_recycler =  v.findViewById(R.id.rvClass);        //RecyclerView网格格式        GridLayoutManager gridlayout = new GridLayoutManager(context,3);        expand_recycler.setLayoutManager(gridlayout);        //RecyclerView的适配器        setchild_Aapterer chapter = new setchild_Aapterer(context,yean,i,i1);        expand_recycler.setAdapter(chapter);        return v;    }    @Override    public boolean isChildSelectable(int i, int i1) {        return false;    }}

setchild_Aapterer 右侧RecyclerView

public class setchild_Aapterer extends RecyclerView.Adapter<setchild_Aapterer.ViewHodler>{    private Context context;    private Yean yean;    private int i,i1;    private OnItemClickListener mOnItemClickListener;    public setchild_Aapterer(Context context,Yean list,int i,int i1) {        this.context = context;        this.yean = list;        this.i = i;        this.i1 = i1;    }    //点击事件    public interface OnItemClickListener{        void onItemClick(View view, int position);    }    public void setOnItemClickListener(OnItemClickListener mOnItemClickListener){        this.mOnItemClickListener = mOnItemClickListener;    }    @Override    public setchild_Aapterer.ViewHodler onCreateViewHolder(ViewGroup parent, int viewType) {        View v = View.inflate(context, R.layout.child_item,null);        ViewHodler hodler = new ViewHodler(v);        hodler.img_child = v.findViewById(R.id.img_child);        hodler.tv_child = v.findViewById(R.id.tv_child);        return hodler;    }    @Override    public void onBindViewHolder(final setchild_Aapterer.ViewHodler holder, int position) {        String[] str =yean.getData().get(i).getList().get(position).getIcon().split("\\|");        String s = str[0];        Glide.with(context).load(s).into(holder.img_child);        holder.tv_child.setText(yean.getData().get(i).getList().get(position).getName());        if (mOnItemClickListener != null){            holder.img_child.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                   int position =holder.getLayoutPosition();                   mOnItemClickListener.onItemClick(holder.itemView,position); //                }            });        }    }    @Override    public int getItemCount() {        return yean.getData().get(i).getList().size();    }    public class ViewHodler extends RecyclerView.ViewHolder {        private ImageView img_child;        private TextView tv_child;        public ViewHodler(View itemView) {            super(itemView);        }    }}

ZuoAdapter 左侧RecyclerView适配器

public class ZuoAdapter  extends RecyclerView.Adapter<ZuoAdapter.MyHolder> {    private Context context;    private Zean zean;    private OnItemClickListener mOnItemClickListener;    public ZuoAdapter(Context context, Zean list) {        this.context = context;        this.zean = list;    }    public interface OnItemClickListener{        void onItemClick(View view, int position);    }    public void setOnItemClickListener(OnItemClickListener mOnItemClickListener){        this.mOnItemClickListener = mOnItemClickListener;    }    @Override    public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {        MyHolder holder = new MyHolder(LayoutInflater.from(context).inflate(R.layout.zuo_litem, parent, false));        return holder;    }    @Override    public void onBindViewHolder(final MyHolder holder, int position) {        holder.zuo_mz.setText(zean.getData().get(position).getName());        if (mOnItemClickListener != null){            holder.zuo_mz.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    int position = holder.getLayoutPosition(); // 1                    mOnItemClickListener.onItemClick(holder.itemView,position); // 2                }            });        }    }    @Override    public int getItemCount() {        return zean.getData().size();    }    class MyHolder extends RecyclerView.ViewHolder {        TextView zuo_mz;        public MyHolder(View itemView) {            super(itemView);            zuo_mz = itemView.findViewById(R.id.zuo_mz);        }    }}

TwoFragment

public class TwoFragment extends Fragment implements IFenView {    private View view;    private RecyclerView rec;    public FenPresenter presenter;    public RecyclerView zrv;    public ExpandableListView yev;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = inflater.inflate(R.layout.fenlie, null);        presenter = new FenPresenter(this);        presenter.ShowPer();        //默认展示第一条        presenter.FlShowYou(1);        //找控件        zrv = view.findViewById(R.id.zrv);        yev = view.findViewById(R.id.yev);        return view;    }    @Override    public void onZuo(final Zean zean) {        zrv.setLayoutManager(new LinearLayoutManager(getActivity()));        //拿到适配器        ZuoAdapter adapter = new ZuoAdapter(getActivity(), zean);        zrv.setAdapter(adapter);        //调用点击事件        adapter.setOnItemClickListener(new ZuoAdapter.OnItemClickListener() {            @Override            public void onItemClick(View view, int position) {                int id = zean.getData().get(position).getCid();                presenter.FlShowYou(id);            }        });    }    @Override    public void onYou(Yean yean) {        ErAdapter adapter = new ErAdapter(getActivity(), yean);        yev.setAdapter(adapter);        //父级列表默认全部展开        int groupCount = yev.getCount();        for (int i = 0; i < groupCount; i++) {            yev.expandGroup(i);        }    }}

fenlei.XML

<LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal"   >    <android.support.v7.widget.RecyclerView        android:id="@+id/zrv"        android:layout_width="130dp"        android:layout_height="match_parent" />    <ExpandableListView        android:id="@+id/yev"        android:layout_width="match_parent"        android:layout_height="match_parent"></ExpandableListView></LinearLayout>

child_itme.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="match_parent"    android:orientation="vertical"    >    <ImageView        android:id="@+id/img_child"        android:layout_width="60dp"        android:layout_height="60dp"        android:layout_gravity="center"        />    <TextView        android:id="@+id/tv_child"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="名字"        android:layout_gravity="center"        /></LinearLayout>

you_litem

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent"><TextView    android:layout_width="100dp"    android:layout_height="50dp"    android:id="@+id/you_you"    /></LinearLayout>

youhai_litem

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="300dp">    <android.support.v7.widget.RecyclerView        android:layout_width="match_parent"        android:layout_height="300dp"        android:id="@+id/rvClass"        ></android.support.v7.widget.RecyclerView></LinearLayout>

zuo_litem

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="50dp">    <TextView        android:id="@+id/zuo_mz"        android:layout_width="match_parent"        android:layout_height="50dp"        android:gravity="center"        android:text="名字"        android:layout_gravity="center"        /></LinearLayout>