Question

我有一个recyclerView，其中包含我想在特定事件发生时滚动到的项目列表。我正在使用v red green blue purple # print red # next v red green blue purple # print green v red blue purple # delete green in the same iteration # next v red blue purple # print purple但令我惊讶的是，它不仅没有光滑，而且我得到一个闪烁效果，就像它必须在实际滚动之前恢复基本位置。效果可以在这里看到：

http://i.imgur.com/rrpLr7N.mp4

这是正常行为吗？

适配器代码：

smoothScrollToPosition

布局文件：

@ActivityScope
class HighlightListAdapter @Inject constructor() : RecyclerView.Adapter<HighlightListAdapter.ViewHolder>() {

private var highlights: List<Highlight> = emptyList()
private var itemClick: ((Highlight, Int) -> Unit)? = null

private var selectedRow: MutableList<Int> = mutableListOf()

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

    val binding = holder.binding
    val highlight = highlights[position]
    var viewModel = binding.viewModel

    viewModel?.unbind()

    viewModel = HighlightViewModel(highlight)
    binding.viewModel = viewModel
    viewModel.bind()

    if(selectedRow.contains(position)) {
        binding.rootItemView.alpha = 1.0f
    }
    else {
        binding.rootItemView.alpha = 0.5f
    }

    holder.setClickListener(itemClick)
}

override fun getItemCount(): Int = highlights.size

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val binding = DataBindingUtil.inflate<ItemHighlightListBinding>(
            LayoutInflater.from(parent.context),
            R.layout.item_highlight_list,
            parent,
            false
    )
    return ViewHolder(binding)
}

fun updateEvents(highlights: List<Highlight>) {
    this.highlights = highlights
    notifyDataSetChanged()
}


fun setClickListener(itemClick: ((Highlight, Int) -> Unit)?) {
    this.itemClick = itemClick
}


fun enableRow(index: Int) {
    //Clear previous selection (only if we want single selection)
    selectedRow.clear()
    //Select specified row
    selectedRow.add(index)
    //Let the adapter redraw
    notifyDataSetChanged()
}

class ViewHolder(val binding: ItemHighlightListBinding) : RecyclerView.ViewHolder(binding.root) {

    fun setClickListener(callback: ((Highlight, Int) -> Unit)?) {
        binding.viewModel.clicks().subscribe {
            callback?.invoke(binding.viewModel.highlight, adapterPosition)
        }
    }

}

fun getSelected() = selectedRow

}

Answer 1

我认为问题在于启用行notifyDataSetChanged（）。它刷新整个数据集，导致轻弹列表。试试这个

fun enableRow(index: Int) {
//Clear previous selection (only if we want single selection)
selectedRow.clear()
//Select specified row
selectedRow.add(index)
//Let the adapter redraw
notifyItemRangeChanged(index,highlights.size())
}

smoothScrollToPosition在RecyclerView上闪烁

1 个答案: