Android Studio Kotlin: RecyclerView不能为空RuntimeException

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val recyclerView: RecyclerView = findViewById(R.id.recyclerView)
        val layoutManager = LinearLayoutManager(this)
        recyclerView.layoutManager = layoutManager

        val myDataList = listOf("Item 1", "Item 2", "Item 3") // 示例数据
        val adapter = MyAdapter(myDataList) // 假设MyAdapter是你的适配器类
        recyclerView.adapter = adapter
    }
}