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[Solved] type ‘List‘ is not a subtype of type ‘List‘ Flutter

Hello Guys, how are you all? Hope you all are fine. You might face type ‘List<dynamic>’ is not a subtype of type ‘List<int>’ Flutter as this error in a flutter. Here I come with all possible solutions for this error.

we are providing you all possible solutions to solve this error. let’s start this article without wasting your time.

How type ‘List<dynamic>’ is not a subtype of type ‘List<int>’ Flutter Error Occurs ?

I am trying to run my code but o found this error in my stacktrack

‘List<dynamic>’ is not a subtype of type ‘List<int>’

At this below line. Here Is I Am Facing Above Error.

        generateID = jsonMap["json_ids"];

How to Solve type ‘List<dynamic>’ is not a subtyoe of type ‘List<int>’ ?

  1. How to Solve type 'List' is not a subtyoe of type 'List' ?

    to Solve type 'List<dynamic>' is not a subtyoe of type 'List<int>' You need to bring the value to its required type before you can assign it. So, all you need to do is Just cast your variable to Integer.

  2. 'List' is not a subtyoe of type 'List'

    to Solve type 'List<dynamic>' is not a subtyoe of type 'List<int>' You need to bring the value to its required type before you can assign it. So, all you need to do is Just cast your variable to Integer.

Solution 1

types in JSON maps or lists don’t have concrete generic types. generateID requires a List<int> not a List (or List<dynamic>), therefore you need to bring the value to its required type before you can assign it. So That just follow below step.

Change

generateID = jsonMap["json_ids"];

to

generateID = jsonMap["json_ids"].cast<int>();

This Solution Worked for me.

Solution 2

A shorten way to handle is

generateID = (jsonMap["json_ids"] as List)?.map((e) => e as int)?.toList();

Solution 3

We could also initializing new List instead of casting. same as below.

var generateIdsFromJson = jsonMap['json_ids'];
List<int> generateIdList = new List<int>.from(generateIdsFromJson);

// then you can use gendreIdsList to the mapping function

generateID = generateIdList

Summery

So it’s all About All possible solutions. Hope this above all solution helped you a lot. Comment below Your thoughts and your queries. Comment Below on your suggestion.

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