更改列表项布局时 RecyclerView 滚动到顶部答案

【问题标题】：When changing list item layout RecyclerView scrolls to top更改列表项布局时 RecyclerView 滚动到顶部
【发布时间】：2020-03-25 11:15:06
【问题描述】：

在我的RecyclerView OnLongClicking 项目中，我想通过将一些 TextViews 设置为 View.GONE 和其他设置为 View.VISIBLE 来更改该项目的布局。一切正常，除了当我长按项目并且布局更改时，我的 RecyclerView 滚动到顶部，如果 LongPressed 视图位于底部，我将无法再看到它。

这是我写的ListAdapter：

class AssetsListAdapter(
    private val onAssetClickListener: OnAssetClickListener,
    private val onAssetLongClickListener: OnAssetLongClickListener
) :
    ListAdapter<Asset, AssetsListAdapter.ViewHolder>(
        AssetDiffCallback()
    ) {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        return ViewHolder(
            inflater.inflate(
                R.layout.list_item,
                parent,
                false
            )
        )
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bind(getItem(position), onAssetClickListener, onAssetLongClickListener)
    }

    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

        fun bind(
            asset: Asset,
            onAssetClickListener: OnAssetClickListener,
            onAssetLongClickListener: OnAssetLongClickListener
        ) {
            itemView.item_name.text = asset.name

            // Set icons relatively to category
            when (asset.category) {
                "Cash" -> itemView.item_image.setImageResource(R.drawable.ic_cash)
                "Bank Account" -> itemView.item_image.setImageResource(R.drawable.ic_bank)
                "Investment" -> itemView.item_image.setImageResource(R.drawable.ic_invest)
                "Salary" -> itemView.item_image.setImageResource(R.drawable.ic_job)
            }

            itemView.setOnClickListener {
                onAssetClickListener.onAssetClick(asset)
            }

            // On long click listeners pulls up quick action options
            itemView.setOnLongClickListener {
                view.item_end_text.visibility = View.GONE
                view.quick_actions_layout.visibility = View.VISIBLE
                onAssetLongClickListener.onAssetLongClick(asset, itemView)
                true
            }
        }

    }

    class AssetDiffCallback : DiffUtil.ItemCallback<Asset>() {
        override fun areItemsTheSame(oldItem: Asset, newItem: Asset): Boolean {
            return oldItem.assetId == newItem.assetId
        }

        override fun areContentsTheSame(oldItem: Asset, newItem: Asset): Boolean {
            return oldItem == newItem
        }
    }

    interface OnAssetClickListener {
        fun onAssetClick(asset: Asset)
    }

    interface OnAssetLongClickListener {
        fun onAssetLongClick(asset: Asset, view: View)
    }

}

【问题讨论】：

标签： android android-recyclerview android-listview android-adapter

【解决方案1】：

好的，所以我发现如果您设置View.GONE，整个项目将被重绘并重置RecyclerView？因为将其设置为View.INVISIBLE 可以解决问题。

itemView.setOnLongClickListener {
            view.item_end_text.visibility = View.GONE
            view.quick_actions_layout.visibility = View.VISIBLE
            onAssetLongClickListener.onAssetLongClick(asset, itemView)
            true
        }

到

itemView.setOnLongClickListener {
                view.item_end_text.visibility = View.INVISIBLE
                view.quick_actions_layout.visibility = View.VISIBLE
                onAssetLongClickListener.onAssetLongClick(asset, itemView)
                true
            }

【讨论】：