仿京東分類實現

首先我這一塊我用的是MVP模式寫的這個分類，簡單說一下它的佈局，就兩塊，左面一塊就是RecyclerView，右面一塊是二級列表嵌套RecyclerView，請求的時候

我用的Retrofit+Rxjava+OkHttp的結合請求的數據，廢話不多說

直接甩代碼，代碼有點多，慢慢看。

先展示一下效果

首先看一下接口

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

Retrofit+Rxjava+OkHttp的結合

import okhttp3.OkHttpClient;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
/**
 * Retrofit+Rxjava+OkHttp封裝，單例
 */
public class RetrofitUnitl {
    private Retrofit mRetrofit;
    private String baseUrl;
    OkHttpClient client;
    private static RetrofitUnitl mRetrofitManager;
    private RetrofitUnitl(String baseUrl,OkHttpClient client){
        this.baseUrl=baseUrl;
        this.client=client;
        initRetrofit();
    }
    public static synchronized RetrofitUnitl getInstance(String baseUrl,OkHttpClient client){
        if (mRetrofitManager == null){
            mRetrofitManager = new RetrofitUnitl(baseUrl,client);
        }
        return mRetrofitManager;
    }
    private void initRetrofit() {
        mRetrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .client(client)
                .build();
    }
    public <T> T setCreate(Class<T> reqServer) {
        return mRetrofit.create(reqServer);
    }
}

分類的佈局

<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"
    tools:context="com.xjq.xinjiaqi20171208.MainActivity">

    <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>

左側bean包和右側的bean包我就不寫了。

下面開始MVP，首先是V層

public interface IFenView {
    void onZuo(Zean zean);//左側請求成功
    void onYou(Yean yean);//右側請求成功
}

M層

public class FenModel {

    ScuMod scuMod;

    public void setScuMod(ScuMod scuMod) {
        this.scuMod = scuMod;
    }

    //左面請求
    public void ZuoChen(){
        //OkHttp裏面可以添加攔截器
        OkHttpClient ok = new OkHttpClient.Builder()
                .build();
        //請求數據
        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);
                    }
                });
    }

    //右面請求
    public void YuoChen(int cont){
        //OkHttp裏面可以添加攔截器
        OkHttpClient ok = new OkHttpClient.Builder()
                .build();
        //請求數據
        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);
                    }
                });
    }
    //定義一個接口
    public interface ScuMod{
        void Zc(Zean bean);
        void Yc(Yean yean);
    }
}

P層

//實現M層的接口
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);
    }

    //左側調用
    public void  ShowPer(){
      model.ZuoChen();
    }
    // 右側調用
    public void FlShowYou(int cont){
        model.YuoChen(cont);
    }
}

我們在主方法裏面一定要實現V層

public class MainActivity extends AppCompatActivity implements IFenView{

    public ExpandableListView yev;
    public RecyclerView zrv;
    public FenPresenter presenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //拿到P層
        presenter = new FenPresenter(this);
        presenter.ShowPer();
       //默認展示第一條
       presenter.FlShowYou(1);
        //找控件
        zrv = findViewById(R.id.zrv);
        yev = findViewById(R.id.yev);
    }

    @Override
    public void onZuo(final Zean zean) {
        //線性佈局
        zrv.setLayoutManager(new LinearLayoutManager(MainActivity.this));
        //拿到適配器
        ZuoAdapter adapter= new ZuoAdapter(MainActivity.this,zean);
        zrv.setAdapter(adapter);
        //調用點擊事件
        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) {
        //拿到適配器
        ErAdapter adapter = new ErAdapter(MainActivity.this,yean);
        yev.setAdapter(adapter);
        //父級列表默認全部展開
        int groupCount = yev.getCount();
        for (int i=0; i<groupCount; i++)
        {
            yev.expandGroup(i);
        }
    }
}

左面RecyclerView的適配器

/**
 * 左面適配器
 */
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);
        }
    }
}

左面適配器的佈局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >
    <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>

右面二級列表適配器

/**
 * 二級列表適配器
 */
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) {
        //父級
        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的佈局
        View v = View.inflate(context,R.layout.youhai_litem,null);
        RecyclerView expand_recycler =  v.findViewById(R.id.rvClass);
        //RecyclerView網格格式
        GridLayoutManager gridlayout = new GridLayoutManager(context,3);
        expand_recycler.setLayoutManager(gridlayout);
        //RecyclerView的適配器
        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;
    }
}

右面適配器二級列表嵌套的RecyclerView的適配器

/**
 * 二級列表嵌套RecyclerView的適配器
 */

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;
    }
    //點擊事件
    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);
        }
    }
}

child_item

<?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>

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