科特林|| Recycleview項沒有膨脹：RecycleView.Adapter的每個重寫方法上的代碼均不可達

Question

我正在Kotlin創建Custom Recycleview
我沒有在代碼中遇到任何異常，並且它運行完美，但是擔心的是該項目沒有出現在Recycleview上，因為該代碼在Adapter類中無法訪問。

RecycleView ：-關於RecycleView適配器的重寫方法的代碼無法訪問。

請檢查我的適配器和活動類

轉接器類別

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)

    }
}

活動課

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

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

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