使用android数据绑定+ Kotlin + ViewModel的ListAdapter点击事件问题

data class Item(val id: Int, val name: String)

class MyViewModel : ViewModel() {
    private val _items = MutableLiveData<List<Item>>()
    val items: LiveData<List<Item>> get() = _items

    private val _onItemClick = MutableLiveData<Item>()
    val onItemClick: LiveData<Item> get() = _onItemClick

    // 初始化数据
    fun initData() {
        // 从数据源获取数据，并设置给_items
    }

    // 列表项点击事件
    fun onItemClick(item: Item) {
        _onItemClick.value = item
    }
}

<layout>
    <data>
        <variable
            name="item"
            type="com.example.Item" />
    </data>

    <LinearLayout
        ... >

        <TextView
            ...
            android:text="@{item.name}" />

    </LinearLayout>
</layout>

<androidx.recyclerview.widget.RecyclerView
    ...
    app:adapter="@{myAdapter}" />

class MyAdapter(private val viewModel: MyViewModel) : RecyclerView.Adapter<MyAdapter.ViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        val binding = ItemLayoutBinding.inflate(inflater, parent, false)
        return ViewHolder(binding)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val item = viewModel.items.value?.get(position)
        item?.let { holder.bind(it) }
    }

    override fun getItemCount(): Int {
        return viewModel.items.value?.size ?: 0
    }

    inner class ViewHolder(private val binding: ItemLayoutBinding) : RecyclerView.ViewHolder(binding.root) {

        init {
            binding.root.setOnClickListener {
                val item = viewModel.items.value?.get(adapterPosition)
                item?.let { viewModel.onItemClick(it) }
            }
        }

        fun bind(item: Item) {
            binding.item = item
            binding.executePendingBindings()
        }
    }
}

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding
    private lateinit var viewModel: MyViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        viewModel = ViewModelProvider(this).get(MyViewModel::class.java)

        binding.lifecycleOwner = this
        binding.viewModel = viewModel

        val adapter = MyAdapter(viewModel)
        binding.myRecyclerView.adapter = adapter

        viewModel.initData()

        viewModel.onItemClick.observe(this, Observer { item ->
            // 处理列表项的点击事件
        })
    }
}