java - 如何在水平 RecyclerView 中基于垂直 RecyclerView 标题设置相同的值

Question

我想显示基于垂直RecyclerView的值，其中有三个不同的标题标题，如扬声器、耳机和麦克风，这三个是类别。在这些类别中，有基于这些类别的值，如多种类型的扬声器和耳机。问题是我想在水平回收器 View 中基于垂直标题显示这些类别类型。我从每个类别中取出四到四个项目，以便可以在水平回收器 View 中基于垂直ReclerView显示每个项目。

这是我从中获取值的主要 Activity

    public class MainActivity extends AppCompatActivity implements RecyclerViewDataAdapter.OnItemClickListner {
        private ProgressDialog progressDialog;
        private Toolbar toolbar;
        String category_Name, Category_ID, Product_ID, Product_Name, Product_Image, Product_Price, Product_Sale, Cart;
        Context context;
        ArrayList<SectionDataModel> singleItemModels;
        ArrayList<SingleItemModel> allSampleData;
        RecyclerView my_recycler_view, my_recycler_vieww;


        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            getCategoryone();
            allSampleData = new ArrayList<SingleItemModel>();
            my_recycler_view = (RecyclerView) findViewById(R.id.my_recycler_view);
    //        my_recycler_vieww = (RecyclerView) findViewById(R.id.recycler_view_list);
    //        my_recycler_vieww.setHasFixedSize(true);
    //        my_recycler_vieww.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));

            my_recycler_view.setHasFixedSize(true);
            my_recycler_view.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));

        }

        public void getCategoryone() {

            final RequestQueue queue = Volley.newRequestQueue(getApplication());
            StringRequest stringRequest = new StringRequest(Request.Method.POST, "http://proaudiobrands.com/app/feature.php",
                    new Response.Listener<String>() {
                        @Override
                        public void onResponse(String response) {
                            Log.i("shabina shopping  response", response);
                            try {
                                singleItemModels = new ArrayList<>();
                                allSampleData = new ArrayList<>();
                                JSONObject mainObj = new JSONObject(response);
                                Log.d("shabina ", response);
                                JSONArray Feature_product = mainObj.getJSONArray("Feature_product");

                                for (int i = 0; i < Feature_product.length(); i++) {
                                    SectionDataModel sectionDataModel = new SectionDataModel();
                                    JSONObject Feature_Product = Feature_product.getJSONObject(i);
                                    String Category_Namee = Feature_Product.getString("Category_Namee");
                                    String Category_IDs = Feature_Product.getString("Category_IDs");
                                    JSONArray Product_List = Feature_Product.getJSONArray("Product_List");
                                    sectionDataModel.setHeaderTitle(Category_Namee);

                                    for (int j = 0; j < Product_List.length(); j++) {
                                        JSONObject Category_Name = Product_List.getJSONObject(j);
                                        category_Name = Category_Name.getString("Category_Name");
                                        Category_ID = Category_Name.getString("Category_ID");
                                        Product_ID = Category_Name.getString("Product_ID");
                                        Product_Name = Category_Name.getString("Product_Name");
                                        Product_Image = Category_Name.getString("Product_Image");
                                        Product_Price = Category_Name.getString("Product_Price");
                                        Product_Sale = Category_Name.getString("Product_Sale");
                                        Cart = Category_Name.getString("Cart");
                                        if (j == 4) {
                                            break;

                                        }

                                        Log.e("sushil Category_Name", category_Name + " " + Category_ID + " " + Product_ID + " " + Product_Name + " " + Product_Image + " " + Product_Price + " " + Product_Sale + " " + Cart);
                                        SingleItemModel singleItemModel1 = new SingleItemModel(category_Name, Category_ID, Product_ID, Product_Name, Product_Image, Product_Price, Product_Sale, Cart);
                                        allSampleData.add(singleItemModel1);
                                    }

                                    sectionDataModel.setAllItemsInSection(allSampleData);
                                    singleItemModels.add(sectionDataModel);
                                }


                                Log.e("Single ItemModel", String.valueOf(singleItemModels));
                                RecyclerViewDataAdapter myAdapter = new RecyclerViewDataAdapter(getApplication(), singleItemModels, MainActivity.this);
                                my_recycler_view.setAdapter(myAdapter);
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        }


                    }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.e("error", error.toString());

                }


            }) {

                @Override
                protected Map<String, String> getParams() throws AuthFailureError {
                    Map<String, String> params = new HashMap<>();
                    params.put("method", "feature");
                    params.put("userId", "PRO1");


                    return params;
                }
            };
            stringRequest.setRetryPolicy(new DefaultRetryPolicy(
                    90000,
                    DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                    DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
            queue.add(stringRequest);


        }

        @Override
        public void onItemClick(View view, int position) {
            Toast.makeText(this, "Hello" + position, Toast.LENGTH_SHORT).show();

        }
    }

Here is My Vertical RecyclerView I which there is header type like HeadPhone,Speaker,MicroPhone

 public class RecyclerViewDataAdapter extends RecyclerView.Adapter<RecyclerViewDataAdapter.ItemRowHolder> {

    private ArrayList<SectionDataModel> arrayList;
    private Context context;
    private OnItemClickListner onItemClickListener;

    public interface OnItemClickListner {
        void onItemClick(View view, int position);
    }

    public RecyclerViewDataAdapter(Context context, ArrayList<SectionDataModel> arrayList, OnItemClickListner onItemClickListener) {
        this.arrayList = arrayList;
        this.onItemClickListener = onItemClickListener;
        this.context = context;
    }

    @Override
    public ItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item, null);
        ItemRowHolder mh = new ItemRowHolder(v);
        return mh;
    }

    @Override
    public void onBindViewHolder(ItemRowHolder holder, final int position) {


        final String Category = arrayList.get(position).getHeaderTitle();
        holder.tvProduct_Name.setText(Category);
        holder.tvProduct_Name.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "Postion" + arrayList.get(position).toString(), Toast.LENGTH_SHORT).show();
            }
        });
        ArrayList<SingleItemModel> arrayListt = arrayList.get(position).getAllItemsInSection();

        if (arrayList.get(0).getHeaderTitle().equals(arrayListt.get(position).getCategory_Name())) {
            SectionListDataAdapter sectionListDataAdapter = new SectionListDataAdapter(context, arrayListt);
            holder.my_recycler_vieww.setHasFixedSize(true);
            holder.my_recycler_vieww.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false));
            holder.my_recycler_vieww.setAdapter(sectionListDataAdapter);

        }
        holder.btnMore.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "Hello" + arrayList.get(position), Toast.LENGTH_SHORT).show();
            }
        });

    }

    @Override
    public int getItemCount() {
        if (arrayList == null)
            return 0;
        return arrayList.size();
    }

        public class ItemRowHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
            private TextView tvCategory_Name, tvCategory_ID, tvProduct_ID, tvProduct_Name, tvProductPrice, tvAmount, tvSale;
            private ImageView imgproduct;
            RecyclerView my_recycler_vieww;
            protected Button btnMore;

            public ItemRowHolder(View itemView) {
                super(itemView);
                tvProduct_Name = (TextView) itemView.findViewById(R.id.itemTitle);
                my_recycler_vieww = (RecyclerView) itemView.findViewById(R.id.recycler_view_list);


                this.btnMore = (Button) itemView.findViewById(R.id.btnMore);


            }

            @Override
            public void onClick(View view) {
                onItemClickListener.onItemClick(view, getAdapterPosition());
            }
        }

    }
Here Is Horizontal RecyclerView in which i have to display Section type

public class SectionListDataAdapter extends RecyclerView.Adapter<SectionListDataAdapter.SingleItemRowHolder> {

    private ArrayList<SingleItemModel> itemsList;
    private Context mContext;


    public interface OnItemClickListner {
        void onItemClick(View view, int position);
    }

    public SectionListDataAdapter(Context context, ArrayList<SingleItemModel> itemsList) {
        this.itemsList = itemsList;
        this.mContext = context;
    }

    @Override
    public SingleItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_single_card, null);
        SingleItemRowHolder mh = new SingleItemRowHolder(v);
        return mh;
    }

    @Override
    public void onBindViewHolder(SingleItemRowHolder holder, int i) {
        SingleItemModel singleItem = itemsList.get(i);

        holder.tvTitle.setText(itemsList.get(i).getCategory_Name());
        Picasso.with(mContext).load(singleItem.getProduct_Image()).fit().into(holder.itemImage);


    }

    @Override
    public int getItemCount() {
        return (null != itemsList ? itemsList.size() : 0);
    }

    public class SingleItemRowHolder extends RecyclerView.ViewHolder {

        protected TextView tvTitle;

        protected ImageView itemImage;


        public SingleItemRowHolder(View view) {
            super(view);

            this.tvTitle = (TextView) view.findViewById(R.id.tvTitle);
            this.itemImage = (ImageView) view.findViewById(R.id.itemImage);


            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {


                    Toast.makeText(v.getContext(), tvTitle.getText(), Toast.LENGTH_SHORT).show();

                }
            });


        }

    }

}

这是我的模型类

public class SingleItemModel {
String Category_Name, Category_ID, Product_ID, Product_Name, Product_Image, Product_Price, Product_Sale, Cart;

public SingleItemModel(String category_Name) {
    Category_Name = category_Name;
}

public SingleItemModel(String category_Name, String category_ID, String product_ID, String product_Name, String product_Image, String product_Price, String product_Sale, String cart) {
    Category_Name = category_Name;
    Category_ID = category_ID;
    Product_ID = product_ID;
    Product_Name = product_Name;
    Product_Image = product_Image;
    Product_Price = product_Price;
    Product_Sale = product_Sale;
    Cart = cart;
}

public String getCategory_Name() {
    return Category_Name;
}

public void setCategory_Name(String category_Name) {
    Category_Name = category_Name;
}

public String getCategory_ID() {
    return Category_ID;
}

public void setCategory_ID(String category_ID) {
    Category_ID = category_ID;
}

public String getProduct_ID() {
    return Product_ID;
}

public void setProduct_ID(String product_ID) {
    Product_ID = product_ID;
}

public String getProduct_Name() {
    return Product_Name;
}

public void setProduct_Name(String product_Name) {
    Product_Name = product_Name;
}

public String getProduct_Image() {
    return Product_Image;
}

public void setProduct_Image(String product_Image) {
    Product_Image = product_Image;
}

public String getProduct_Price() {
    return Product_Price;
}

public void setProduct_Price(String product_Price) {
    Product_Price = product_Price;
}

public String getProduct_Sale() {
    return Product_Sale;
}

public void setProduct_Sale(String product_Sale) {
    Product_Sale = product_Sale;
}

public String getCart() {
    return Cart;
}

public void setCart(String cart) {
    Cart = cart;
}

}

这是我的部分模型类

public class SectionDataModel {

private String headerTitle;
private ArrayList<SingleItemModel> allItemsInSection;


public SectionDataModel() {

}
public SectionDataModel(String headerTitle, ArrayList<SingleItemModel> allItemsInSection) {
    this.headerTitle = headerTitle;
    this.allItemsInSection = allItemsInSection;
}



public String getHeaderTitle() {
    return headerTitle;
}

public void setHeaderTitle(String headerTitle) {
    this.headerTitle = headerTitle;
}

public ArrayList<SingleItemModel> getAllItemsInSection() {
    return allItemsInSection;
}

public void setAllItemsInSection(ArrayList<SingleItemModel> allItemsInSection) {
    this.allItemsInSection = allItemsInSection;
}

}

这是我的图片

我的问题是我的Arraylist中有12个对象，并且所有12个对象都显示在每个适配器中，而不是基于类型

Answer 1

if 语句 if(arrayList.get(0).getHeaderTitle().equals(arrayListt.get(position).getCategory_Name())) 返回 false，持有者项目 my_recycler_vieww 只是重用它的缓存值，这就是为什么你会得到相同的项目。声明应该是这样的

    `if(arrayList.get(0).getHeaderTitle().equals(arrayListt.get(position).getCategory_Name())) {
                SectionListDataAdapter sectionListDataAdapter = new SectionListDataAdapter(context, arrayListt);
                holder.my_recycler_vieww.setHasFixedSize(true);
                holder.my_recycler_vieww.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false));
                holder.my_recycler_vieww.setAdapter(sectionListDataAdapter);

            }
else{
  holder.my_recycler_vieww.setAdapter(null);
}