android - 如何在 Kotlin 中将 if 表达式转换为 when

Question

如何使用 Kotlin 将以下代码从 if 表达式 转换为 when？

实际上，我在 Activity 中使用了 2 个适配器，我在将 if expression 转换为 when 时遇到问题，有什么解决方案吗？

这是我的代码

    var ADAPTER_TYPE_1=adapter1
    var ADAPTER_TYPE_2=adapter2

   if(ADAPTER_TYPE_1 ==lvFoods2.adapter) {
       ADAPTER_TYPE_1 = FoodAdapter(listOfFoods2, this)
       lvFoods2.adapter = ADAPTER_TYPE_1
    } else if (ADAPTER_TYPE_2==lvFoods2.adapter) {
       ADAPTER_TYPE_2 = FoodAdapter2(listOfFoods3, this)
       lvFoods2.adapter = ADAPTER_TYPE_2
     }

Answer 1

像这样:

var adapterType1 = adapter1
var adapterType2 = adapter2

lvFoods2.adapter = when (lvFoods2.adapter) {
    adapterType1 -> FoodAdapter(listOfFoods2, this).also { adapterType1 = it }
    adapterType2 -> FoodAdapter2(listOfFoods3, this).also { adapterType2 = it }
    else -> lvFoods2.adapter
}