Android开发：通过字符串名称动态加载Drawable资源以避免运行时错误

package me.eyrim.foodrecords2;

import com.google.gson.annotations.SerializedName;

public class Ingredient {
    @SerializedName("ingredient_name")
    private String ingredientName;
    // 将 int 更改为 String
    @SerializedName("ingredient_drawable_tag")
    private String ingredientDrawableTag; 

    public String getIngredientName() {
        return this.ingredientName;
    }

    // 返回 String 类型
    public String getIngredientDrawableTag() {
        return this.ingredientDrawableTag;
    }
}

{
    "recipe_name": "My test recipe 1 updated",
    "recipe_id": "0",
    "recipe_desc": "this is a test desc for my test recipe 1",
    "ingredients": [{
            "ingredient_name": "Tomato",
            // 从整数 ID 更改为字符串名称
            "ingredient_drawable_tag": "tomato" 
        },
        {
            "ingredient_name": "Pepper",
            // 从整数 ID 更改为字符串名称
            "ingredient_drawable_tag": "pepper" 
        }
    ]
}

package me.eyrim.foodrecords2.recipeviewactivity;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import me.eyrim.foodrecords2.Ingredient;
import me.eyrim.foodrecords2.R; // 确保 R 类被导入

public class IngredientRecyclerViewAdapter extends RecyclerView.Adapter<IngredientRecyclerViewAdapter.IngredientViewHolder> {
    private final Ingredient[] ingredients;
    private final Context context; // 存储 Context 实例

    // 构造函数需要接收 Context
    public IngredientRecyclerViewAdapter(Ingredient[] ingredients, Context context) {
        this.ingredients = ingredients;
        this.context = context; // 初始化 Context
    }

    @NonNull
    @Override
    public IngredientViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.ingredient_row, parent, false);
        return new IngredientViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull IngredientViewHolder holder, int position) {
        String drawableName = this.ingredients[position].getIngredientDrawableTag();

        // 使用 getIdentifier() 动态获取资源 ID
        int drawableId = context.getResources().getIdentifier(
            drawableName,      // 资源名称 (字符串)
            "drawable",        // 资源类型 (例如 "drawable", "string", "layout")
            context.getPackageName() // 应用包名
        );

        // 检查是否成功找到资源ID，避免找不到资源时崩溃
        if (drawableId != 0) {
            holder.imageView.setImageResource(drawableId);
        } else {
            // 如果找不到对应的 drawable，可以设置一个默认的占位符图片
            holder.imageView.setImageResource(R.drawable.default_ingredient_placeholder); // 假设你有一个默认图片
            // 或者记录日志，以便调试
            // Log.w("IngredientAdapter", "Drawable not found for name: " + drawableName);
        }
    }

    @Override
    public int getItemCount() {
        return this.ingredients.length;
    }

    public static class IngredientViewHolder extends RecyclerView.ViewHolder { // 静态内部类
        private final ImageView imageView;
        // 如果有 TextView，也在这里初始化
        // private final TextView textView;

        public IngredientViewHolder(@NonNull View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.ingredient_image);
            // textView = itemView.findViewById(R.id.ingredient_name_text); // 如果有的话
        }
    }
}