Android 当kotlin中的表达式未按预期工作时

我想知道是否有人能帮我解决这个问题，当表达式表示特定的代码块时

我有两个活动可以连接到以下两个方面：

第一个活动是

MainActivity.kt

，第二个活动是

Main2Activity.kt

，在第二个活动中，我遇到了在

Main2Activity类中包含特定代码块时应用表达式的问题
因为我想在单击
MainActivity类中的image时传递
Main2Activity类中的特定适配器
，就像在第一个activity类中单击image
b
时传递
adapter\u TYPE\u 2
一样，它的主要问题是始终应用
Main2Activity类中的第一个代码块

注意：第一个活动使用了
GridView
和第二个活动使用了
ListView
，我在
Main2Activity.kt
中有两个适配器，我正在使用
enum
由第二个活动中的每个适配器组成

这里是一个主要活动。kt

class MainActivity : AppCompatActivity() {

var adapter:FoodAdapter?=null
var listOfFoods =ArrayList<Food>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(layout.activity_main)


// load foods
listOfFoods.add(Food("Coffee","   Coffee preparation is", a))
listOfFoods.add(Food("Coffee","   Coffee preparation is", b))
listOfFoods.add(Food("Coffee","   Coffee preparation is", c))
listOfFoods.add(Food("Coffee","   Coffee preparation is", d))

adapter= FoodAdapter(this,listOfFoods)

gvListFood.adapter =adapter

}


class  FoodAdapter: BaseAdapter {
var listOfFood= ArrayList<Food>()
var context: Context?=null
constructor(context:Context,listOfFood:ArrayList<Food>):super(){
    this.context=context
    this.listOfFood=listOfFood
}
override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View? {
    val food = this.listOfFood[p0]
    var inflator = context!!.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
    var foodView= inflator.inflate(layout.food_ticket,null)
    foodView.ivFoodImage.setImageResource(food.image!!)
    foodView.ivFoodImage.setOnClickListener {


        val intent = Intent(context, Main2Activity::class.java)

        when (foodView) {
            foodView.ivFoodImage.also { a } ->
                intent.putExtra(Main2Activity.EXTRA_ADAPTER_MODE, AdapterType.ADAPTER_TYPE_1.ordinal) {

                    intent.putExtra("name", food.name!!)
                    intent.putExtra("des", food.des!!)
                    intent.putExtra("image", food.image!!)
                    context!!.startActivity(intent)
                }

            foodView.ivFoodImage.also { b } ->
                intent.putExtra(Main2Activity.EXTRA_ADAPTER_MODE, AdapterType.ADAPTER_TYPE_2.ordinal) {

                   intent.putExtra("name", food.name!!)
                   intent.putExtra("des", food.des!!)
                   intent.putExtra("image", food.image!!)
                   context!!.startActivity(intent)
            }
        }

    }
    return foodView
}

override fun getItem(p0: Int): Any {
    return listOfFood[p0]
}

override fun getItemId(p0: Int): Long {
    return p0.toLong()
}

override fun getCount(): Int {

    return listOfFood.size
}

}
}

class Main2Activity : AppCompatActivity() {
companion object {
    val EXTRA_ADAPTER_MODE = "extra_adapter_mode"

}

    var adapter1: FoodAdapter1?= null
    var adapter2: FoodAdapter2? = null
    var listOfFoods2 = ArrayList<Food>()
    var listOfFoods3 = ArrayList<Food>()
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(activity_main2)


    val bundle = intent.extras
    val adapterTypeOrdinal = intent.getIntExtra(EXTRA_ADAPTER_MODE, 0) // 0 is the default value
    val type = AdapterType.fromOrdinal(ordinal = adapterTypeOrdinal)


    val name = bundle.getString("name")
    val des = bundle.getString("des")
    val image = bundle.getInt("image")



    ivFoodImage2?.let {
        it.setImageResource(image)
    }

    tvName2?.let {
        it.text = name
    }

    tvDes2?.let {
        it.text = des
    }


    // load foods2
    listOfFoods2.add(Food("Coffee", "   Coffee1 preparation is", R.drawable.a))
    listOfFoods2.add(Food("Coffee", "   Coffee2 preparation is", R.drawable.b))



    // load foods3
    listOfFoods3.add(Food("Coffee", "   Coffee3 preparation is", R.drawable.c))
    listOfFoods3.add(Food("Coffee", "   Coffee4 preparation is", R.drawable.d))

     //var ADAPTER_TYPE_1 = adapter1
    //var ADAPTER_TYPE_2 = adapter2

    lvFoods2.adapter = when (type) {
        AdapterType.ADAPTER_TYPE_1-> FoodAdapter1(listOfFoods2, this)
        AdapterType.ADAPTER_TYPE_2-> FoodAdapter2(listOfFoods3, this)
        else -> lvFoods2.adapter
    }
}



class FoodAdapter1 : BaseAdapter{
    var context: Context? = null
    var listOfFoodsLocal2 = ArrayList<Food>()

    constructor(listOfFoods2: ArrayList<Food>, context: Context) : super() {
        this.listOfFoodsLocal2 = listOfFoods2
        this.context = context
    }

    override fun getView(p0: Int, foodView: View?, p2: ViewGroup?): View {
        val food = this.listOfFoodsLocal2[p0]
        var inflator = context!!.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
        val foodView = inflator.inflate(food_ticket2, null)



        foodView.ivFoodImage2?.let {
            it.setImageResource(food.image!!)
                 }
        foodView.tvName2?.let {

            it.text = food.name!!
        }
        foodView.tvDes2?.let {
            it.text = food.des!!
        }

        foodView.ivFoodImage2.setOnClickListener {

            //move to next
            val intent = Intent(context, FoodDetails::class.java)
            intent.putExtra("name", food.name!!)
            intent.putExtra("des", food.des!!)
            intent.putExtra("image", food.image!!)

            context!!.startActivity(intent)

        }
        return foodView

    }


    override fun getItem(p0: Int): Any {
        return listOfFoodsLocal2[p0]
    }

    override fun getItemId(p0: Int): Long {
        return p0.toLong()
    }

    override fun getCount(): Int {
        return listOfFoodsLocal2.size
    }

}

class FoodAdapter2 : BaseAdapter {
    var context: Context? = null
    var listOfFoodsLocal3 = ArrayList<Food>()

    constructor(listOfFoods3: ArrayList<Food>, context: Context) : super() {
        this.listOfFoodsLocal3 = listOfFoods3
        this.context = context
    }

    override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {
        val food = this.listOfFoodsLocal3[p0]
        var inflator = context!!.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
        val foodView = inflator.inflate(food_ticket2, null)


            foodView.ivFoodImage2?.let {
                it.setImageResource(food.image!!)
            }
            foodView.tvName2?.let {
                it.text = food.name!!
            }
            foodView.tvDes2?.let {
                it.text = food.des!!
            }




        foodView.ivFoodImage2.setOnClickListener {

            //move to next
            val intent = Intent(context, FoodDetails::class.java)
            intent.putExtra("name", food.name!!)
            intent.putExtra("des", food.des!!)
            intent.putExtra("image", food.image!!)

            context!!.startActivity(intent)

        }
        return foodView

    }


    override fun getItem(p0: Int): Any {
        return listOfFoodsLocal3[p0]
    }

    override fun getItemId(p0: Int): Long {
        return p0.toLong()
    }

    override fun getCount(): Int {
        return listOfFoodsLocal3.size
    }

}
}


执行已关闭

var ADAPTER_TYPE_1 = adapter1
var ADAPTER_TYPE_2 = adapter2

lvFoods2.adapter = when (lvFoods2.adapter) {
    ADAPTER_TYPE_1 -> FoodAdapter1(listOfFoods2, this).also { ADAPTER_TYPE_1 = it }
    ADAPTER_TYPE_2  -> FoodAdapter2(listOfFoods3, this).also { ADAPTER_TYPE_2 = it }
    else -> lvFoods2.adapter
}

adapter1
变量和
lvFoods2.adapter
都为空。从我对代码的理解来看，它应该是这样的：

lvFoods2.adapter = when (type) {
    ADAPTER_TYPE_1 -> FoodAdapter1(listOfFoods2, this)
    ADAPTER_TYPE_2  -> FoodAdapter2(listOfFoods3, this)
    else -> lvFoods2.adapter
}

非常感谢@tynn的回答，事实上我已经回答了，但是它显示了我的这条消息
不兼容的类型：Main2Activity.FoodAdapter1？和AdapterType？
，我的问题被add image
null error
更新了，你能检查一下吗？你也必须删除
var ADAPTER\u TYPE\u x
，我做了，但还是一样的，请你检查我的第二张照片@tynn为什么你要再次尝试匹配类型？您应该使用
AdapterType.ADAPTER\u TYPE\u x
或静态导入这些。您知道如何解决这个问题吗？因为我问这个问题没有得到任何答案，请您帮助@tynn
enum class AdapterType {
ADAPTER_TYPE_1,
ADAPTER_TYPE_2;



    companion object {
        fun fromOrdinal(ordinal: Int): AdapterType? {
            return AdapterType.values().firstOrNull { it.ordinal == ordinal }
        }
    }
}

var ADAPTER_TYPE_1 = adapter1
var ADAPTER_TYPE_2 = adapter2

lvFoods2.adapter = when (lvFoods2.adapter) {
    ADAPTER_TYPE_1 -> FoodAdapter1(listOfFoods2, this).also { ADAPTER_TYPE_1 = it }
    ADAPTER_TYPE_2  -> FoodAdapter2(listOfFoods3, this).also { ADAPTER_TYPE_2 = it }
    else -> lvFoods2.adapter
}

lvFoods2.adapter = when (type) {
    ADAPTER_TYPE_1 -> FoodAdapter1(listOfFoods2, this)
    ADAPTER_TYPE_2  -> FoodAdapter2(listOfFoods3, this)
    else -> lvFoods2.adapter
}