科特林|| Recycleview项没有膨胀：RecycleView.Adapter的每个重写方法上的代码均不可达

Question

I am creating the Custom Recycleview in Kotlin
I am not getting any exception in the code and it run perfectly but the concern is that item is not getting appear on the Recycleview beacuase the code is unreachable in Adapter class.

Waring :- Unreachable code on the overridden method of RecycleView adapter.

Please check my Adapter and Activity class

Adapter Class

class CustomRecycleAdapter(val data: ArrayList<String>) : RecyclerView.Adapter<CustomRecycleAdapter.ViewHolder>() {
    override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): ViewHolder {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        val v = LayoutInflater.from(parent?.context).inflate(R.layout.recycle_item, parent, false)
        return ViewHolder(v)

    }

    override fun getItemCount(): Int {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        return data.size;
    }

    override fun onBindViewHolder(holder: ViewHolder?, position: Int) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        val item = data[position]
        println("Data is here==>>> "+item)
        holder?.textViewName?.text = item;
    }

    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {


        val textViewName = itemView.findViewById<TextView>(R.id.tvName)

    }
}

Activity class

class FirstRecycleViewExample : AppCompatActivity() {
    val data = arrayListOf<String>()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.first_recycleview)

        val recycler_view =   findViewById<RecyclerView>(R.id.recycler_view)

        data.add("First Data")
        data.add("Second Data")
        data.add("Third Data")
        data.add("Forth Data")
        data.add("Fifth Data")

        //creating our adapter
        val adapter = CustomRecycleAdapter(data)

        //now adding the adapter to recyclerview
        recycler_view.adapter = adapter

    }


}

Answer 1

您尚未为RecyclerView添加布局管理器，只需添加LinearLayoutManager或GridLayoutManager

recycler_view.layoutManager = LinearLayoutManager(this, LinearLayout.VERTICAL, false)