BaseRecyclerViewAdapterHelper
BaseRecyclerViewAdapterHelper copied to clipboard
CymChad
3.0.2版本，RV弄无限循环滚动，每次都报空指针，getItem、getDefItemCount方法都重写了
代码：
override fun convert(holder: BaseDataBindingHolder<RvItemDataBinding>, item: JsonBean.DataBean) {
holder.dataBinding?.data = item
}
override fun getDefItemCount(): Int {
return Int.MAX_VALUE
}
override fun getItem(position: Int): JsonBean.DataBean {
return if (position >= data.size)
data[position % data.size]
else
data[position]
}
错误信息： kotlin.KotlinNullPointerException at com.chad.library.adapter.base.BaseQuickAdapter.onCreateViewHolder(BaseQuickAdapter.kt:231) at com.chad.library.adapter.base.BaseQuickAdapter.onCreateViewHolder(BaseQuickAdapter.kt:75) at androidx.recyclerview.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:7078) at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6235) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
这是我用原生Adaoter写法，可以正常运行：
`
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyVH {
val binding = DataBindingUtil.inflate<RvItemDataBinding>(LayoutInflater.from(context), R.layout.rv_item_data, parent, false)
return MyVH(binding.root, binding)
}
override fun getItemCount(): Int {
return Int.MAX_VALUE
}
override fun onBindViewHolder(holder: MyVH, position: Int) {
if (position >= data.size)
holder.binding.data = data[position % data.size]
else
holder.binding.data = data[position]
}
class MyVH(itemView: View, val binding: RvItemDataBinding) : RecyclerView.ViewHolder(itemView)
`
能给个demo么？
链接: https://pan.baidu.com/s/1gpilUzlHbTI4aDRY-mindw 提取码: 4gte 有2个Adapter，一个原生写的，一个用BRVAH，你看看
需要重写getItemViewType方法呀
private val adapter by lazy { object : BaseQuickAdapter<Int, BaseViewHolder>(R.layout.item_layout) { override fun convert(helper: BaseViewHolder?, item: Int?) { helper?.itemView?.apply { textView.text = "hello world$item" } }
override fun getItemCount(): Int {
return Int.MAX_VALUE
}
override fun getItem(position: Int): Int? {
return data[position % data.size]
}
override fun getItemViewType(position: Int): Int {
var count = headerLayoutCount + data.size
if (count <= 0) {
count = 1
}
return super.getItemViewType(position % count)
}
}
}
