[英]Unable to filter AutoCompleteTextView after settings it's value to “”
我的 Android 應用程序中有一個AutoCompleteTextView
,我為它的布局和過濾器制作了一個自定義適配器。
問題是過濾器工作正常,直到我取消我在AutoCompleteTextView
中寫入的所有內容,一旦我清除它,構造函數中的列表變為空並且沒有任何要過濾的項目,並且只有當我清空輸入值時才會發生。
默認情況下,當輸入為空時,我會顯示用戶可以選擇的整個項目列表。
這是我的自定義適配器:
class FornitoriAdapter(context: Context, fornitori: MutableList<Fornitori> = mutableListOf(), resource: Int) :
ArrayAdapter<Fornitori>(context, resource), Filterable {
private var filteredList: MutableList<Fornitori> = mutableListOf()
init {
filteredList = fornitori.toMutableList()
}
override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
val row: View
val holder: ViewHolder
if (convertView == null) {
val inflater = LayoutInflater.from(context)
row = inflater.inflate(R.layout.list_item, parent, false)
holder = ViewHolder(row)
row.tag = holder
} else {
row = convertView
holder = row.tag as ViewHolder
}
val fornitore: Fornitori = filteredList[position]
holder.descrText.text = fornitore.desc
holder.codeText.text = fornitore.cod
return row
}
override fun getCount(): Int {
return filteredList.size
}
override fun getItem(position: Int): Fornitori {
return filteredList[position]
}
private class ViewHolder constructor(row: View) {
val descrText: TextView = row.findViewById(R.id.description)
val codeText: TextView = row.findViewById(R.id.code)
}
override fun getFilter(): Filter {
return customFilter
}
private val customFilter = object : Filter() {
override fun convertResultToString(resultValue: Any?): CharSequence {
return (resultValue as Fornitori).desc
}
override fun performFiltering(constraint: CharSequence?): FilterResults {
return if (constraint != null) {
filteredList.clear()
fornitori.forEach { // HERE FORNITORI IF I EMPTY THE INPUT BECOME LENGTH 0
if (it.cod.equals(constraint.toString(), ignoreCase = true) || it.desc.toLowerCase(
Locale.ROOT
).startsWith(
constraint.toString().toLowerCase(
Locale.ROOT
)
)
) {
filteredList.add(it)
}
}
val filterResults = FilterResults()
filterResults.values = filteredList
filterResults.count = filteredList.size
filterResults
}else {
filteredList.clear()
filteredList = fornitori
val filterResults = FilterResults()
filterResults.values = filteredList
filterResults.count = filteredList.size
filterResults
}
}
override fun publishResults(constraint: CharSequence?, filterResults: FilterResults) {
val filterList = filterResults.values as? MutableList<*>
if (filterResults.count > 0) {
filterList?.forEach {
add(it as Fornitori)
}.also {
notifyDataSetChanged()
}
}
}
}
}
因此,一旦我開始過濾或選擇顯示的項目之一,一切正常,但是一旦我取消輸入值,我將無法從自動完成中獲取任何值,因為 fornitori 設置為 null,就像它的列表已被清除但我實際上僅清除過濾列表..
問題來自您的第一個設置
filteredList = fornitori
然后打電話
filteredList.clear()
由於您已將filteredList
列表設置為引用fornitori
,然后通過清除filteredList
列表您也清除fornitori
。 因此,您實際上應該將filteredList
復制到fornitori
中,而不是僅僅重新分配變量。
Kotlin 實際上沒有列表的副本 function,但在我看來,這樣的事情是最清楚的:
filteredList.clear()
filteredList.addAll(fornitori)
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