Infinite loop on using FutureBuilder with API call

You're creating Future object on every rebuild of the widget. And since you're calling setState inside your setData method, it triggers a rebuild recursively.

To solve this problem you have to keep a reference to the Future object. And use that reference for the FutureBuilder then it can understand that it is the previously used one.

E.g:

Future<List<Task>> _tasks;
@override
  void initState() {
    _tasks = getAllTasks();
    super.initState();
  }

And in your widget tree use it like that:

Expanded(
          child: FutureBuilder(
              future: _tasks,
              initialData: [],
              builder: (context, snapshot) {
                return createTasksListView(context, snapshot);
              }),
        ),