DataBinding笔记6

RecyclerView

1.adapter 部分 通用的adapter

data class BindingRecyclerViewHolder(val binding:ViewDataBinding) : RecyclerView.ViewHolder(binding.root)

abstract class BindingRecyclerAdapter<T>(private val context: Context, private val layoutId:Int, var list:ArrayList<T>): RecyclerView.Adapter<BindingRecyclerViewHolder>() {
    override fun getItemCount(): Int {
        return list?.size ?: 0
    }
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BindingRecyclerViewHolder {
        val binding=DataBindingUtil.inflate<ViewDataBinding>(LayoutInflater.from(context),layoutId,parent,false)
        return BindingRecyclerViewHolder(binding)
    }
    override fun onBindViewHolder(holder: BindingRecyclerViewHolder, position: Int) {
        holder.itemView.tag = position
        convert(holder, list[position], position)
    }
    /**
     * 填充RecyclerView适配器的方法，子类需要重写
     *
     * @param holder   ViewHolder
     * @param item     子项
     * @param position 位置
     */
    abstract fun convert(holder: BindingRecyclerViewHolder?, item: T, position: Int)

}

activity.xml

<import type="com.example.databinding.BindingRecyclerAdapter"/>
<variable
   name="recyclerAdapter"
   type="BindingRecyclerAdapter" />

<androidx.recyclerview.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
    app:adapter="@{recyclerAdapter}"
   />

activity

  val radapter=object:BindingRecyclerAdapter<House>(this,R.layout.item_recycler,houses){
      override fun convert(holder: BindingRecyclerViewHolder?, item: House, position: Int) {
                holder?.binding?.setVariable(BR.house_info,item)
                holder?.binding?.executePendingBindings()
            }
        }
   bindingBinding.recyclerAdapter=radapter
   radapter.notifyDataSetChanged()

House

class House {
    var address: ObservableField<String> = ObservableField<String>()
    var size: ObservableInt = ObservableInt()
    var number: ObservableField<String> = ObservableField<String>()
}