如何解决SearchView 不更新 RecyclerView 直到滚动
我正在尝试过滤包含大约 3000 个项目的 recyclerList
。
我的过滤器有点工作,但由于某种原因,它不会更新列表,直到我滚动到足够远。
例如:前 2 个元素以字母 A 开头 --> 如果我的过滤器以 B 开头,则前 2 个元素仍会显示,直到我滚动到足够远以至于它们不再可见为止。当我向上滚动时,它们从视图中消失了。
适配器
class LocationAdapter(
private var locations: ArrayList<Costcenter>,private val onLocationClick: (location: Costcenter) -> Unit
) : RecyclerView.Adapter<LocationAdapter.LocationViewHolder>(),Filterable {
var locationsFiltered = locations
override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): LocationViewHolder {
val view = LayoutInflater
.from(parent.context)
.inflate(R.layout.location_row,parent,false)
return LocationViewHolder(view)
}
override fun getItemCount(): Int = locationsFiltered.size
override fun onBindViewHolder(holder: LocationViewHolder,position: Int) {
holder.bind(locationsFiltered[position])
}
inner class LocationViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
private val title: TextView = itemView.findViewById(R.id.txtCostCenter)
private val desc: TextView = itemView.findViewById(R.id.txtCostCenterDescription)
fun bind(loc: Costcenter) {
title.text = loc.goederenontvanger
desc.text = loc.goederenontvanger_omschrijving
itemView.setonClickListener {
onLocationClick.invoke(loc)
}
}
}
override fun getFilter(): Filter {
return object : Filter() {
override fun performFiltering(constraint: CharSequence?): FilterResults {
val charSearch = constraint.toString()
locationsFiltered = if (charSearch.isEmpty()) {
locations
} else {
val resultList = ArrayList<Costcenter>()
for (row in locations) {
if (row.goederenontvanger.toLowerCase()
.contains(charSearch.toLowerCase()) || row.goederenontvanger_omschrijving.toLowerCase()
.contains(charSearch.toLowerCase())
) {
resultList.add(row)
}
}
resultList
}
val filterResults = FilterResults()
filterResults.values = locationsFiltered
return filterResults
}
override fun publishResults(constraint: CharSequence?,results: FilterResults?) {
}
}
}
}
创建回收视图的片段
class LocationsFragment : Fragment() {
private lateinit var locationAdapter: LocationAdapter
private val storageviewmodel by activityviewmodels<Storageviewmodel>()
private lateinit var currentView : View
override fun onCreateView(
inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
): View? {
var view = inflater.inflate(R.layout.fragment_locations,container,false)
var recycler = view.findViewById<RecyclerView>(R.id.recyclerLocations)
var filter = view.findViewById<SearchView>(R.id.editFilter)
locationAdapter = LocationAdapter(Utilities.costcenters) { loc -> setSelectedLocation(loc) }
val recycleMngr: RecyclerView.LayoutManager =
linearlayoutmanager(context,linearlayoutmanager.VERTICAL,false)
filter.setonQueryTextListener(object: SearchView.OnQueryTextListener{
override fun onQueryTextSubmit(query: String?): Boolean {
return false
}
override fun onQueryTextChange(newText: String?): Boolean {
locationAdapter.filter.filter(newText)
return false
}
})
recycler.layoutManager = recycleMngr
recycler.adapter = locationAdapter
currentView = view
return view
}
解决方法
当使用 locationsFiltered
发布过滤器时,您需要使用过滤后的结果更新原始列表 publishResults()
,然后使用 notifyDataSetChanged()
将更改应用于 RecyclerView
>
因此在 publishResults()
方法中添加以下内容:
override fun publishResults(constraint: CharSequence?,results: FilterResults?) {
locationsFiltered = filterResults.values as ArrayList<Costcenter>
notifyDataSetChanged()
}
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