更改列表项布局时 RecyclerView 滚动到顶部
When changing list item layout RecyclerView scrolls to top
在我的 RecyclerView
OnLongClicking 项目中,我想通过将一些 TextViews
设置为 View.GONE
并将其他设置为 View.VISIBLE
来更改该项目的布局。一切正常,除了当我长按该项目并且布局发生变化时,我的 RecyclerView
滚动到顶部并且我再也看不到 LongPressed 视图(如果它位于底部)。
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)
}
}
好的,所以我发现如果你设置 View.GONE
整个项目会被重绘并重置 RecyclerView
?因为将它设置为 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
}
至
itemView.setOnLongClickListener {
view.item_end_text.visibility = View.INVISIBLE
view.quick_actions_layout.visibility = View.VISIBLE
onAssetLongClickListener.onAssetLongClick(asset, itemView)
true
}
在我的 RecyclerView
OnLongClicking 项目中,我想通过将一些 TextViews
设置为 View.GONE
并将其他设置为 View.VISIBLE
来更改该项目的布局。一切正常,除了当我长按该项目并且布局发生变化时,我的 RecyclerView
滚动到顶部并且我再也看不到 LongPressed 视图(如果它位于底部)。
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)
}
}
好的,所以我发现如果你设置 View.GONE
整个项目会被重绘并重置 RecyclerView
?因为将它设置为 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
}
至
itemView.setOnLongClickListener {
view.item_end_text.visibility = View.INVISIBLE
view.quick_actions_layout.visibility = View.VISIBLE
onAssetLongClickListener.onAssetLongClick(asset, itemView)
true
}