持久化BottomSheet扩容时如何隐藏AppBar？

class MainActivity : AppCompatActivity() {

    private lateinit var bottomSheetBehavior: BottomSheetBehavior<View>

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

        val appBarLayout = findViewById<AppBarLayout>(R.id.appBarLayout)
        val bottomSheet = findViewById<View>(R.id.bottomSheet)

        bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet)
        bottomSheetBehavior.addBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
            override fun onSlide(bottomSheet: View, slideOffset: Float) {
                // 根据slideOffset的值，控制AppBar的可见性
                appBarLayout.alpha = 1 - slideOffset
            }

            override fun onStateChanged(bottomSheet: View, newState: Int) {
                // 可在需要时处理状态改变事件
            }
        })
    }
}