如何解决如何更改 findViewById 以查看绑定?
这是我的适配器代码;
class ModelViewHolder(view: View) : RecyclerView.ViewHolder(view) {
private val chName: TextView = view.findViewById(R.id.chName)
private val chBirthYear: TextView = view.findViewById(R.id.chBirthYear)
private val chHeight: TextView = view.findViewById(R.id.chHeight)
private val chHomeWorld: TextView = view.findViewById(R.id.chHomeWorld)
解决方法
获取列表项视图绑定类并像这样修改:
//ItemModelBinding is the generated binding class for the list view item
class ModelViewHolder(val binding: ItemModelBinding) : RecyclerView.ViewHolder(binding.root) {
fun bind(item: SomeModelClass) {
binding.chName = item.chName
binding.chBirthYear = item.chBirthYear
binding.chHeight = item.chHeight
binding.chHomeWorld= item.chHomeWorld
binding.executePendingBindings()
}
override fun onBindViewHolder(holder: ModelViewHolder,position: Int) {
val item = getItem(position)
holder.bind(item)
}
,
class ModelViewHolder(view: View) RecyclerView.ViewHolder(view){
val binding = LayoutYouWantToUseBinding.bind(view)
}
,
ListAdapter 是 RecyclerView.Adapter 基类,用于在 RecyclerView 中呈现 List 数据,包括计算后台线程上的 List 之间的差异。
DiffUtil 有助于计算后台线程上两个列表之间的差异。并且只更新数据已更改的视图意味着调用 onBindViewHolder() 的次数更少,如果我们仍然坚持使用 notifyDataSetChanged()任何数据更改。
class ModelAdapter : ListAdapter<Model,ModelAdapter.ModelViewHolder>(ModelDiffCallBack()) {
class ModelViewHolder(private val binding: ModelItemLayoutBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(model: Model) {
//if data binding is also enabled
binding.model = model
//else set data for each view one after another
binding.txtTitle.text = model.title
//and so on for all the items
binding.executePendingBindings()
}
companion object {
fun from(parent: ViewGroup): ModelViewHolder {
val layoutInflater = LayoutInflater.from(parent.context)
val binding = ModelItemLayoutBinding.inflate(layoutInflater,parent,false)
return ModelViewHolder(binding)
}
}
}
override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): ModelViewHolder =
ModelViewHolder.from(parent)
override fun onBindViewHolder(holder: ModelViewHolder,position: Int) {
val model = getItem(position)
holder.bind(model)
}
class ModelDiffCallBack : DiffUtil.ItemCallback<Model>() {
override fun areItemsTheSame(oldItem: Model,newItem: Model): Boolean =
oldItem === newItem
override fun areContentsTheSame(oldItem: Model,newItem: Model): Boolean =
oldItem == newItem
}
}
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