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I'm sure this is extremely simple, but I've been away from Android for a while and new to Kotlin as well, so I'm not sure what I'm looking at.

I'm following tutorials online to set up recycler view, and I always see a recyclerView varaible with methods like .apply and .layoutManager being called on it.

The problem is that I don't see where recyclerView is initialized (or imported?), and in my app I'm getting a red underline on it with 'unresolved reference error'.

Here's the full main activity of the setup I'm trying to reproduce from a StackOverflow answer.

Trying to create a simple recyclerView in Kotlin, but the adapter is not applying properly

To me, in the below example, recyclerView seems to be getting used out of nowhere. What is going on?



import android.os.Bundle
import android.support.v7.widget.LinearLayoutManager
import android.view.Window
import android.view.WindowManager
import android.widget.LinearLayout
import kotlinx.android.synthetic.main.activity_main.*
import net.simplifiedcoding.recyclerviewexample.CustomAdapter


class MainActivity : Activity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        requestWindowFeature(Window.FEATURE_NO_TITLE)
        window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN)

        setContentView(R.layout.activity_main)

        val users = ArrayList<Model_Details>()
        users.add(Model_Details("Kaju katli", "Kaju katli, also known as kaju Katari or kaju barfi, is an Indian dessert similar to a barfi.",R.drawable.kaju))
        users.add(Model_Details("Doughnut", "The doughnut is popular in many countries and prepared in various forms as a sweet snack that can be homemade or purchased in bakeries, supermarkets, food stalls, and franchised specialty outlets",R.drawable.donuts))
        users.add(Model_Details("Panna cotta", "Panna cotta is an Italian dessert of sweetened cream thickened with gelatin and molded. The cream may be aromatized with rum, coffee, vanilla, or other flavorings.",R.drawable.panna_cotta))
        users.add(Model_Details("Rose Cookies", "Rose cooky is a famous South Indian snack made during festivals",R.drawable.rosecookies))
        users.add(Model_Details("Belgian waffle", "In North America, Belgian waffles are a variety of waffle with a lighter batter, larger squares, and deeper pockets than ordinary American waffles",R.drawable.belgianwaffle))

        val obj_adapter = CustomAdapter(users)

        recyclerView.layoutManager = LinearLayoutManager(this, LinearLayout.VERTICAL, false)
        recyclerView.adapter = obj_adapter
    }


}
```
Louis Sankey
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1 Answers1

1

In your example you're using Kotlin synthetics, but Kotlin Android Extensions is deprecated. The recommendation is use view binding. Link to migrate here.

neyogiry
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