Android：Recyclerview，Data Binding和View Model

1. 添加Recyclerview到布局文件中：

2. 在ViewModel中定义一个ObservableList来存储数据：

val dataList = ObservableArrayList()

3. 创建一个适配器类来绑定数据：

class MyAdapter(private val viewModel: MyViewModel) :
    RecyclerView.Adapter() {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val binding =
            ItemLayoutBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        binding.viewModel = viewModel
        return MyViewHolder(binding.root)
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        holder.binding.model = viewModel.dataList[position]
    }

    override fun getItemCount(): Int {
        return viewModel.dataList.size
    }
}

4. 定义ViewHolder类并在其中初始化布局文件：

class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    val binding: ItemLayoutBinding = DataBindingUtil.bind(itemView)!!
}

5. 在Activity中绑定RecyclerView和ViewModel：

val recyclerAdapter = MyAdapter(viewModel)
recyclerView.adapter = recyclerAdapter

6. 在布局文件中使用data标签来声明ViewModel：

7. 最后，添加数据到ObservableList中：

viewModel.dataList.addAll(myDataList)