一： 在activity里

 binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        =
binding = ActivityMainBinding.inflate(layoutInflater) setContentView(binding.root)

二：在RecyclerView的onCreateViewHolder里，不能使用：

val binding = RecyclerViewItemBinding.inflate(layoutInflater)it didn't work

要使用：

val binding = DataBindingUtil.inflate<RecyclerViewItemBinding>(
                layoutInflater,
                R.layout.recycler_view_item,
                parent,
                false
            )