简单二级联动 RecyclerView嵌套

具体代码：
https://github.com/sunli0828/Month_Demo/blob/master/sunli1220/src/main/java/com/sunli/test1220/LevelLinkActivity.java

//主页面

public class LevelLinkActivity extends AppCompatActivity implements IView, View.OnClickListener{

    private IPresenterImpl iPresenter;
    private RecyclerView recycler_parent;
    private RecyclerView recycler_children;
    private boolean flag = true;
    private ParentAdapter parentAdapter;
    private int index;
    private ChildrenAdapter childrenAdapter;
    private List carBeanData;
    private Button btn_animator;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_level_link);

        iPresenter = new IPresenterImpl(this);
        iPresenter.startRequest(ApiUtils.URL_SHOPCAR_INFO, null, CarBean.class);
        recycler_parent = findViewById(R.id.level_recycler_parent);
        recycler_children = findViewById(R.id.level_recycler_children);
        btn_animator = findViewById(R.id.level_btn_animator_code);
        btn_animator.setOnClickListener(this);

        recycler_parent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                iPresenter.startRequest(ApiUtils.URL_SHOPCAR_INFO, null, CarBean.class);
            }
        });
        showParent();
        parentAdapter.setListener(new ParentAdapter.ParentCallbackListener() {
            @Override
            public void parentCallbackListener(int i) {
                index = i;
                flag = false;
                showChildren();
            }
        });
    }
//父
    private void showParent() {
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(LevelLinkActivity.this);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recycler_parent.setLayoutManager(linearLayoutManager);
        parentAdapter = new ParentAdapter(this);
        recycler_parent.setAdapter(this.parentAdapter);
        recycler_parent.addItemDecoration(new DividerItemDecoration(this,
                DividerItemDecoration.VERTICAL));
    }
//子
    private void showChildren() {
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recycler_children.setLayoutManager(linearLayoutManager);
        flag = false;

        childrenAdapter = new ChildrenAdapter(this);
        recycler_children.setAdapter(childrenAdapter);
        recycler_children.addItemDecoration(new DividerItemDecoration(this,
                DividerItemDecoration.VERTICAL));

        iPresenter.startRequest(ApiUtils.URL_SHOPCAR_INFO, null, CarBean.class);
        childrenAdapter.setListBeanList(carBeanData.get(index).getList());
    }

    @Override
    public void showResponseData(Object data) {
        CarBean carBean = (CarBean) data;
        carBeanData = carBean.getData();
        if (carBeanData != null) {
            carBeanData.remove(0);
            parentAdapter.setDataBeanList(carBeanData);
        }
    }

    @Override
    public void showResponseFail(Exception e) {

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        iPresenter.onDetach();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.level_btn_animator_code:
                Intent intentAnimator = new Intent(LevelLinkActivity.this, AnimatorOrCodeActivity.class);
                startActivity(intentAnimator);
                break;
            default:
                break;
        }
    }
}

//父RecyclerView的适配器

public class ParentAdapter extends RecyclerView.Adapter {

    private List dataBeanList = new ArrayList<>();
    private Context dataContext;

    public ParentAdapter(Context dataContext) {
        this.dataContext = dataContext;
    }

    public void setDataBeanList(List dataBeanList) {
        this.dataBeanList = dataBeanList;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public ParentViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = View.inflate(dataContext, R.layout.adapter_item_parent, null);
        ParentViewHolder parentViewHolder = new ParentViewHolder(view);
        return parentViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull ParentViewHolder parentViewHolder, final int i) {
        parentViewHolder.sellerName.setText(dataBeanList.get(i).getSellerName());
        parentViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (parentCallbackListener != null) {
                    parentCallbackListener.parentCallbackListener(i);
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return dataBeanList.size();
    }

    public class ParentViewHolder extends RecyclerView.ViewHolder {
        TextView sellerName;
        public ParentViewHolder(@NonNull View itemView) {
            super(itemView);
            sellerName = itemView.findViewById(R.id.item_parent_text);
        }
    }

    public interface ParentCallbackListener{
        void parentCallbackListener(int i);
    }

    ParentCallbackListener parentCallbackListener;

    public void setListener(ParentCallbackListener listener) {
        this.parentCallbackListener = listener;
    }
}

//子RecyclerView的适配器

public class ChildrenAdapter extends RecyclerView.Adapter {

    private List listBeanList;
    private Context listContext;

    public ChildrenAdapter(Context listContext) {
        this.listContext = listContext;
    }

    public void setListBeanList(List listBeanList) {
        this.listBeanList = listBeanList;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public ChilderenViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = View.inflate(listContext, R.layout.adapter_item_children, null);
        return new ChilderenViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ChilderenViewHolder childerenViewHolder, final int i) {
        String url = listBeanList.get(i).getImages().split("\\|")[0].replace("https", "http");
        Glide.with(listContext).load(url).into(childerenViewHolder.childrenIcon);

        childerenViewHolder.childrenTitle.setText(listBeanList.get(i).getTitle());
        childerenViewHolder.childrenPrice.setText(listBeanList.get(i).getPrice() + "");
        childerenViewHolder.chilerenNum.setText(listBeanList.get(i).getNum() + "");
    }

    @Override
    public int getItemCount() {
        return listBeanList.size();
    }

    public class ChilderenViewHolder extends RecyclerView.ViewHolder {
        ImageView childrenIcon;
        TextView childrenPrice, childrenTitle, chilerenNum;
        public ChilderenViewHolder(@NonNull View itemView) {
            super(itemView);
            childrenIcon = itemView.findViewById(R.id.item_children_icon);
            childrenTitle = itemView.findViewById(R.id.item_children_title);
            childrenPrice = itemView.findViewById(R.id.item_children_price);
            chilerenNum = itemView.findViewById(R.id.item_children_num);
        }
    }
}

xml文件
① activity

② parent

③ children