I'm a newbie learning kotlin and android and I'm trying out simple swipe-able views with ViewPager2.

This is my adapter code:

class ViewPagerAdapter(var images: List<Int>):
    RecyclerView.Adapter<ViewPagerAdapter.ViewPagerViewHolder>()
   {
        inner class ViewPagerViewHolder(val binding: ItemViewPagerBinding): RecyclerView.ViewHolder(binding.root)

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

       override fun onBindViewHolder(holder: ViewPagerViewHolder, position: Int) {
           var curImage = images[position]
           holder.binding.imgview.setImageResource(curImage)

       }

       override fun getItemCount(): Int {
           return images.size
       }
   }

This is my MainActivity file where I'm getting the error:

class MainActivity : AppCompatActivity() {
    private lateinit var binding:ActivityMainBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        binding = ActivityMainBinding.inflate(layoutInflater)
        super.onCreate(savedInstanceState)
        setContentView(binding.root)

        var image = listOf {
            R.drawable.illustration
            R.drawable.pexelsphoto
            R.drawable.preview
            R.drawable.wallpaper
            R.drawable.yh
        }


        val adapter = ViewPagerAdapter(image)
        binding.viewPager.adapter = adapter

        binding.viewPager.orientation = ViewPager2.ORIENTATION_VERTICAL

    }
}

This is the error I'm getting on the image variable in the ViewPagerAdapter parenthesis

Type mismatch: inferred type is List<() -> Int> but List<Int> was expected

I'm unable to find any solution online on how to fix this

CodePudding user response：

You defined the image list in wrong way, it must be like this

var image = listOf (
            R.drawable.illustration,
            R.drawable.pexelsphoto,
            R.drawable.preview,
            R.drawable.wallpaper,
            R.drawable.yh
        )

The expected type is List<Int> and it is defined like above. Meanwhile you use listOf {} which is List<() -> Int> type.