滚动到最后一个位置时如何将项目添加到PagingListAdpter中

凤凰育肥

当用户滚动到最后一个位置时，如何添加也具有不同ViewType的新项目并将其显示在recyclerView上？

我已经从loadInitial和loadAfter获取数据。但是我想知道当API向我发送最后一个项目时如何添加新项目吗？

对于示例API，发送数据大小为50，并且当用户滚动到位置49时，我需要向适配器添加另一个是我的自定义ViewType，大小将为51位置50

弗里曼

这是我的代码，它将为您服务

class FollowFeedPagedListAdapter(val context: Context, val itemClicked: (FollowFeedModel) -> Unit) : PagedListAdapter<FollowFeedModel, RecyclerView.ViewHolder>(DIFF_COMPARATOR) {


val TYPE_NORMAL = 1
val TYPE_LAST_POSITION = 2

companion object {
    private val DIFF_COMPARATOR = object : DiffUtil.ItemCallback<FollowFeedModel>() {
        override fun areItemsTheSame(oldItem: FollowFeedModel, newItem: FollowFeedModel): Boolean {
            return oldItem == newItem
        }

        override fun areContentsTheSame(oldItem: FollowFeedModel, newItem: FollowFeedModel): Boolean {
            return oldItem.id == newItem.id
        }
    }

    private var hasMore: Boolean = true

    @JvmStatic
    fun getHasMoreInstance() = hasMore

    @JvmStatic
    fun setHasMoreInstance(boolean: Boolean) {
        hasMore = boolean

    }
}

override fun getItemCount(): Int {
    val size = super.getItemCount()
    //เพิ่มอันสุดท้าย
    return size+1
}

override fun getItemViewType(position: Int): Int {
    if (position == itemCount - 1) {
        return TYPE_LAST_POSITION
    } else {
        return TYPE_NORMAL
    }
}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
    when (viewType) {
        TYPE_NORMAL -> {
            val view = LayoutInflater.from(context).inflate(R.layout.row_summaries_layout_version2, parent, false)
            return SummariesModelViewHolder(view, itemClicked)
        }
        TYPE_LAST_POSITION -> {
            val view = LayoutInflater.from(context).inflate(R.layout.layout_no_more_follow_feed, parent, false)
            return NoMoreFollowFeedViewHolder(view)
        }
        else -> {
            val view = LayoutInflater.from(context).inflate(R.layout.layout_no_more_follow_feed, parent, false)
            return SummariesModelViewHolder(view, itemClicked)
        }
    }
}


override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {

    when (holder.itemViewType) {
        TYPE_NORMAL -> {
            val holder = holder as SummariesModelViewHolder
            holder.binding(getItem(position))
        }
        TYPE_LAST_POSITION -> {
            val holder = holder as NoMoreFollowFeedViewHolder
        }
    }
}

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