Flutter - 在自动完成搜索位置 - 参数类型 &#39;List<String> ？&#39; 不能分配给参数类型“列表”<String> &#39;

Question

When I'm run autocomplete search location using firebase_google_place library and use as per document implementation that time I got below error on run time.

The argument type 'List?' can't be assigned to the parameter type 'List' because 'List?' is nullable and 'List' isn't.

• 'List' is from 'dart:core'. types: widget.types,

Answer 1

Just before you do something with the List you got from firebase_google_places, check if the list you is null:

void main() {
  List<String>? list = getList();
  
  // check if null
  if(list != null) {
    checkList(list);
  }
}

void checkList(List<String> list) {
  print(list.first);
  print(list.last);
}

List<String>? getList() {
  return ["Test", "jdsgksa", "hsjgaiop"];
}