onSlide 本身就是用户主动拖动才会回调的，直接调用 show 或者 expand 是不会触发这个回调的。要实现类似拖动的效果，可以手动模拟拖动来计算 offset ，并设置视频缩放，参考代码如下：

val bottomSheetDialog = BottomSheetDialog(requireActivity())
val cOntentView= layoutInflater.inflate(R.layout.bottom_sheet_layout, null)
bottomSheetDialog.setContentView(contentView)

// 获取 bottomSheet 的 View
bottomSheetDialog.setOnShowListener { dialog ->
val bottomSheet = (dialog as BottomSheetDialog)
.findViewById<View>(com.google.android.material.R.id.design_bottom_sheet)

bottomSheet?.post {
val behavior = BottomSheetBehavior.from(bottomSheet)

// 添加回调监听
behavior.addBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
override fun onStateChanged(bottomSheet: View, newState: Int) {
Log.i(TAG, "onStateChanged: $newState")
}

override fun onSlide(bottomSheet: View, slideOffset: Float) {
Log.i(TAG, "onSlide: $slideOffset")
slideOffsetListener?.onSlideOffsetChanged(slideOffset)
}
})

// 模拟 onSlide 回调
val parentHeight = (bottomSheet.parent as View).height.toFloat()
val currentHeight = bottomSheet.height.toFloat()

// 注意：Google 官方行为可能不一定是线性计算 slideOffset ，这里是近似值
val simulatedOffset = (currentHeight / parentHeight).coerceIn(0f, 1f)

Log.i(TAG, "模拟 onSlide, 当前高度: $currentHeight, 总高度: $parentHeight, offset: $simulatedOffset")
slideOffsetListener?.onSlideOffsetChanged(simulatedOffset)
}
}

bottomSheetDialog.show()