Question

我有一个reciclerview，在每一行中都有一个Button和一个文本，这个想法就是当用户点击按钮时，这会增加edittext的值并增加＆＃34; uni＆＃34;这是传递给adaptar的数据的成员

我的基类产品

public class Product {
    String name;
    Integer amount;

    public Product(String name, Integer amount) {
        this.name = name;
        this.amount = amount;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAmount() {
        return amount;
    }

    public void setAmount(Integer amount) {
        this.amount = amount;
    }
}

和适配器

public class AdapterProduct extends 

    RecyclerView.Adapter<AdapterProduct.ProductsViewHolder> {

        private ArrayList<Product> datos;

        public AdapterProduct(ArrayList<Product> datos) {
            this.datos = datos;
        }




        @Override
        public ProductsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View item = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.item_layout, parent, false);
            ProductsViewHolder pvh = new ProductsViewHolder(item);
            return pvh;
        }

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

            holder.textView.setText(datos.get(position).getName());

        }

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


        public static class ProductsViewHolder extends RecyclerView.ViewHolder {

            private TextView textView;
            private EditText edit;
            private Button btn;

            public ProductsViewHolder(final View itemView) {
                super(itemView);
                textView = (TextView)itemView.findViewById(R.id.txtProd);
                edit = (EditText) itemView.findViewById(R.id.txtCantidad);
                btn = (Button) itemView.findViewById(R.id.btnMas);
                btn.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        //increment the value of the text
                        Integer n = Integer.parseInt(edit.getText().toString());
                        edit.setText(String.valueOf(++n));
                        //here I need increment Product.amount ++
                        // but it is not posible because I am in Static class
                    }
                });

            }

        }
    }

我该怎么做？我使用recyclerview是正确的吗？可能是其他控制。请问我非常坚持这个问题，不要让我接下来的事情

Answer 1

简单的方法就是添加bind方法。并在onBindViewHolder上使用它

RecyclerView.ViewHolder {

    private TextView textView;
    private EditText edit;
    private Button btn;

    public ProductsViewHolder(final View itemView) {
        super(itemView);
        textView = (TextView)itemView.findViewById(R.id.txtProd);
        edit = (EditText) itemView.findViewById(R.id.txtCantidad);
        btn = (Button) itemView.findViewById(R.id.btnMas);
    }

    public void bind(Product product) {
        textView.setText(product.getName())
        btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //increment the value of the text
            Integer n = Integer.parseInt(edit.getText().toString());
            edit.setText(String.valueOf(++n));
            product.setAmount(++n);
            //here I need increment Product.amount ++
             // but it is not posible because I am in Static class
            }
        }); 
    }
}

您可以创建某种ViewBinder。并在onBindViewHolder上使用它。所以你所有的商业逻辑都会在一个班级上，而观点在另一个班级上。

public static class ProductsViewHolder extends RecyclerView.ViewHolder {

    TextView textView;
    EditText edit;
    Button btn;

    public ProductsViewHolder(final View itemView) {
        super(itemView);
        textView = (TextView)itemView.findViewById(R.id.txtProd);
        edit = (EditText) itemView.findViewById(R.id.txtCantidad);
        btn = (Button) itemView.findViewById(R.id.btnMas);
    }

}

public static class ProductsViewBinder {

    public void bind(final ProductsViewHolder viewHolder, final Product product) {
        viewHolder.textView.setText(product.getName())
        viewHolder.btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //increment the value of the text
                Integer n = Integer.parseInt(viewHolder.edit.getText().toString());
                viewHolder.edit.setText(String.valueOf(++n));
                product.setAmount(++n);
                //here I need increment Product.amount ++
                // but it is not posible because I am in Static class
            }
        });
    }
}

从适配器中删除所有商务逻辑到任何控制器（活动/片段等）或Presenter。正如回答below。这是一种更好的方式。适配器应该只知道如何绑定视图。



    public interface Callback {
        void onButtonClickListener(Product product);
    }

    public static class ProductsViewBinder {

        public void bind(final ProductsViewHolder viewHolder, final Product product, Callback callback) {
            viewHolder.textView.setText(product.getName())
            viewHolder.btn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //increment the value of the text
                    Integer n = Integer.parseInt(viewHolder.edit.getText().toString());
                    viewHolder.edit.setText(String.valueOf(++n));
                    callback.onButtonClickListener(product);
                    /*
                    Or you can pass a potison to onButtonClickListener by using viewHolder.getAdapterPosition()
                    */
                }
            });
        }
    }

Answer 2

定义一个这样的接口类：

public interface yourInterface {
   void onButtonCliked() ;

}

现在在你的活动中调用适配器类实现这个界面如下：

pulic class yourActivity extends AppComptaActivity implement yourInterface{


//your stuff 

@override
 public void onButtonClicked(){
  // increase your data here      
}
}

现在为您的适配器类创建新的构造函数，如下所示：

yourInterface mInterface ; // local var 
public AdapterProduct(yourInterface interface){ mInterface = interface}

并且：

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

        holder.textView.setText(datos.get(position).getName());

        mInterface.onButtonClicked() ;

    }

最后：

现在在活动类中修改为：

AdapterProduct yourAdapter = new AdapterProduct(this) ;

如何在RecycleView中修改内部类中外部类的成员

2 个答案: