CODEWITHSUNDEEP
androidimagekotlin
andios
andios

Reputation: 61

Expected type mismatch with if expression in Kotlin

I wonder if somebody can help me to fix this issue with mismatched types inside the if expression by using Kotlin?

I have 2 activities to connect between the: The first activity is MainActivity.kt and the second activity is Main2Activity.kt, inside first activity MainActivity class i got a problem for mismatched types, because i'm using if statement to choose specific image to be convert to the specific adapter in the second activity like when click on image (a) to be converted to the 2nd activity with ADAPTER_TYPE_1 and image (b) converted to the 2nd activity with ADAPTER_TYPE_2

Note: image type is Int, my first image named a inside my Drawable and the second image named b

Here is a MainActivity.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))


    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, foodView: 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)


            if (foodView.ivFoodImage == 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)

            }
            if (foodView.ivFoodImage == 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
    }

}
}

error image

Here is Food class

 class Food(val name: String, val des: String, val image: Int)

Upvotes: 1

Views: 2257

Answers (2)

tynn
tynn

Reputation: 39843

You cannot get the resource id of the drawable you added to the image view. For specifying this you can use the id or even better the tag. In you case you even have this information with your food entity and should use it here.

class FoodAdapter(
    val context: Context,
    val listOfFood: ArrayList<Food>
): BaseAdapter {

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

        return inflator.inflate(layout.food_ticket, null).also {
            it.ivFoodImage.imageResource = food.image
            it.ivFoodImage.setOnClickListener { view ->

                context.startActivity(Intent(context, Main2Activity::class.java)
                    .putExtra("name", food.name)
                    .putExtra("des", food.des)
                    .putExtra("image", food.image)
                    .also {
                        when (food.image) {
                            a -> it.putExtra(Main2Activity.EXTRA_ADAPTER_MODE, AdapterType.ADAPTER_TYPE_1.ordinal)
                            b -> it.putExtra(Main2Activity.EXTRA_ADAPTER_MODE, AdapterType.ADAPTER_TYPE_2.ordinal)
                            else -> it
                        }
                    })
            }
        }
    }

    override fun getItem(p0: Int) = listOfFood[p0]

    override fun getItemId(p0: Int) = p0.toLong()

    override fun getCount() = listOfFood.size
}

Upvotes: 1

Alexandr Tolstikov
Alexandr Tolstikov

Reputation: 78

Try to think in kotlin-way, i.e. try to not use nullable types. Also your class Food written in java-style but it can be written in more simple style: class Food(val name: String, val des: String, val image: Int)

When you override java methods often you can remove '?' from parameter type in order to throw away '!!' in future moments when requires not-null type. var class property is not desirable because it gives state that you need to watch that nothing happens in runtime.

Probably tips above will resolve your issues. If no, can you give more information about this error?(e.g. line number of error)

Upvotes: 2

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