问题重写onDrawerOpened() - Kotlin

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.drawerlayout.widget.DrawerLayout
import com.google.android.material.navigation.NavigationView

class MainActivity : AppCompatActivity() {

    private lateinit var drawerLayout: DrawerLayout
    private lateinit var navigationView: NavigationView

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

        drawerLayout = findViewById(R.id.drawer_layout)
        navigationView = findViewById(R.id.nav_view)

        drawerLayout.addDrawerListener(object : DrawerLayout.DrawerListener {
            override fun onDrawerSlide(drawerView: View, slideOffset: Float) {}
            override fun onDrawerOpened(drawerView: View) {
                // 抽屉打开时的操作
                updateUIWhenDrawerOpen()
            }
            override fun onDrawerClosed(drawerView: View) {}
            override fun onDrawerStateChanged(newState: Int) {}
        })
    }

    private fun updateUIWhenDrawerOpen() {
        // 例如，可以在这里更新 UI 或执行其他操作
        Toast.makeText(this, "抽屉已打开", Toast.LENGTH_SHORT).show()
    }
}