如何为列表中的列表创建RecyclerView适配器

Question

我正在构建一个配方应用程序（静态数据）。

我创建了一个“食谱”类，在单例对象中，我创建了一个食谱实例列表。

Recipes类包含以下参数：

title: String
ingredients: List<String>
instructions : String
time: Long serves:
Int cost: String
source : String

现在我想为配料创建一个适配器，所以我可以为配料列表创建一个RecyclerView。

我的问题是将配料列表传递给适配器，而不是配方列表。

我正在尝试不同的事情，但不太确定该怎么做。已经坚持了几天这个问题。

这是食谱类：

class Recipes(val title: String, val ingredients: List<String>, val instructions: String, val time: Long, val serves: Int, val level: String, val source: String) {

    private val prepTimeHours: Long = time / 60
    private val preTimeMinutes: Long = time.rem(60)
    val prepTime: String = "${prepTimeHours.toString()}:${preTimeMinutes.toString()}"

    val peopleServed: String = "$serves adults"
}

这是Singleton：

object AllRecipes {

    val recipeBook = listOf(
        Recipes ("Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"),
        Recipes ("2Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"),
        Recipes ("3Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"),
        Recipes ("4Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"),
        Recipes ("5Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"),
        Recipes ("6Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"),
        Recipes ("7Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"),
        Recipes ("8Red wine-braised baby octopus with black olives", listOf("vegetables", "fruits", "candy"), "cook like this make like that", 90, 6, "easy", "https://www.foodandwine.com/recipes/red-wine-braised-baby-octopus-with-black-olives"))
}

这是我目前的适配器：

class IngredientsAdapter(val context: Context, val ingredient: List<Recipes>) : RecyclerView.Adapter<IngredientsAdapter.Holder>() {

    inner class Holder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val singleIngredient = itemView.findViewById<TextView>(R.id.single_ingredient)

        fun bindText(textVar: Recipes, context: Context) {
            singleIngredient.text = textVar.ingredients[adapterPosition]
        }
    }

    override fun onBindViewHolder(holder: Holder, position: Int) {
        holder.bindText(ingredient[position], context)
    }

    override fun getItemCount(): Int {
        return ingredient.count()
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.ingredients_layout, parent, false)
        return Holder(view)
    }
}

任何帮助，将不胜感激！

Answer 1

你可以看看answer here。关键的想法是为每种成分添加RecyclerView的每个项目的额外视图。实际上，您不必为您的案例实现嵌套的RecyclerView。只是为每个项目添加更多布局应该没问题，因为成分是有限的。

answer显示了三种不同的方式。如果你的成分数量不是那么大，你可以有多个TextViews以及你的主要RecyclerView的每个项目以及View.GONE的默认可见性。根据您拥有的成分数量，您可以考虑启用某些成分的可见性，而另一成分仍然不可见。

希望有所帮助！