[英]How to add item to Dart Flutter Secure Storage stringList?
My goal is to save a list with Secure Storage and add new items to this list.我的目标是使用安全存储保存列表并向该列表添加新项目。 There will be a list.
会有一个列表。 There will be items in it.
里面会有物品。 I want to add an item to that list later.
我想稍后将一个项目添加到该列表中。 In the methods I tried, it did delete the entire list.
在我尝试的方法中,它确实删除了整个列表。 I couldn't add an item to the already existing list.
我无法将项目添加到现有列表中。
How can I do it?我该怎么做?
I am currently stuck here:我目前被困在这里:
Future<void> listUpload() async {
final prefences = await SharedPreferences.getInstance();
prefences.setStringList("values", ["Value 1"]);
var printList = prefences.getStringList("testler");
debugPrint(printList.toString());
setState() {
}
}
Give this a go:给这个 go:
Future<void> listUpload() async {
final prefences = await SharedPreferences.getInstance();
// The debug print is unnecessary but there if you want it.
// var printList = prefences.getStringList("values");
// debugPrint(printList.toString());
setState(() {
prefences.setStringList("values", prefences.getStringList("values")! + ["Your value"]);
});
}
Couple things about your set state:关于你的集合 state 的一些事情:
Firstly, it needed to be wrapped in one more set of brackets.首先,它需要再用一组括号包裹起来。
((){})
instead of (){}
. ((){})
而不是(){}
。
Also, as we can't exactly edit the list, let's just grab the list and whatever value we need to the end of it.此外,由于我们无法完全编辑列表,所以我们只获取列表以及我们需要的任何值到它的末尾。
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