PopupWindow+AutoCompleteTextView轻松实现带下拉选择列表输入框的下拉弹窗

题目有点不太好理解，直接上效果图：

红色背景是PopupWindow，其中的输入框是AutoCompleteTextView

AutoCompleteTextView自定义adapter，实现Filterable接口过滤数据：

override fun getFilter(): Filter { return object : Filter() { override fun performFiltering(constraint: CharSequence?): FilterResults { val results = FilterResults() val filterLists = datas.filter { //是否包含输入字符 !constraint.isNullOrBlank() && it.contains(constraint) } results.count = filterLists.size results.values = filterLists return results } override fun publishResults(constraint: CharSequence?, results: FilterResults) { filterLists.clear() filterLists.addAll(results.values as MutableList<String>) notifyDataSetChanged() } } }

PopupWindow+AutoCompleteTextView