使用 notifyPropertyChanged(BR.property) 告知数据的更改。

代码实例:

1. 创建一个带有可观察属性的类, 包含数据项.

class MyItem : BaseObservable() {
    @get:Bindable
    var name: String = ""
        set(value) {
            field = value
            notifyPropertyChanged(BR.name) // 通知名字更改
        }

    @get:Bindable
    var age: Int = 0
        set(value) {
            field = value
            notifyPropertyChanged(BR.age) // 通知年龄更改
        }
}

2. 在你的ViewModel中使用一个可观察的 MutableLiveData列表:

class MyViewModel : ViewModel() {
    val items = MutableLiveData>()

    // 添加或更新一个条目
    fun addItem(item: MyItem) {
        val list = items.value?.toMutableList() ?: mutableListOf()
        val index = list.indexOfFirst { it.id == item.id }

        if (index != -1) {
            list[index] = item
        } else {
            list.add(item)
        }
        items.value = list
    }

    // 删除一个条目
    fun removeItem(item: MyItem) {
        val list = items.value?.toMutableList() ?: mutableListOf()
        list.remove(item)
        items.value = list
    }
}

3. 在你的Adapter中, 接收更改并通知RecyclerView:

class MyAdapter : RecyclerView.Adapter() {

    var items: List = emptyList()
        set(value) {
            field = value
            notifyDataSetChanged() // 当数据更新时, 通知RecyclerView
        }

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

        fun bind(item: MyItem) {
            binding.item = item
            binding.executePendingBindings() // 立即更新UI
        }
    }

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

    override fun onBindViewHolder