Flutter - Can't update state when minimizing app screen - flutter

Question

I'm working with Flutter and I have two cards in the home, the first one, I have to show the most recent call that comes to me, and the second card, it should show me the class that is happening according to the current time, however, I want that when my application is minimized or switched, it updates these two cards, where the first card is CardAviso(),
and the second is CardDiarioClasse()
class Home extends StatefulWidget {
const Home({Key? key}) : super(key: key);
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> with WidgetsBindingObserver {
var loading = false;
final List<HorariosTurma> _list = [];
final List<HorariosTurma> _listCardDiario = [];
String professorNome = "";
_HomeState() {
getProfessorApi();
}
redirectComunicados() {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Comunicados(),
),
);
}
getProfessorApi() {
loading = true;
_list.clear();
API.getApiProfessor().then((response) {
if (response.statusCode == 200) {
Map<String, dynamic> professor = jsonDecode(response.body);
List<dynamic> horariosTurma = professor["horariosturma"];
horariosTurma.forEach((value) {
var horarioTurma = HorariosTurma.fromJson(value);
if (horarioTurma.turma != null || horarioTurma.sala != null) {
_list.add(horarioTurma);
}
});
DateTime now = DateTime(DateTime.now().year, DateTime.now().month,
DateTime.now().day, DateTime.now().hour - 3, DateTime.now().minute);
_list.removeWhere(
(element) => (element.sala == null || element.turma == null));
_list.forEach((e) {
DateTime hourInitList = DateTime(
DateTime.now().year,
DateTime.now().month,
DateTime.now().day,
int.parse(e.horaInicio.toString().split(':')[0]),
int.parse(e.horaInicio.toString().split(':')[1]));
DateTime hourFinalList = DateTime(
DateTime.now().year,
DateTime.now().month,
DateTime.now().day,
int.parse(e.horaFinal.toString().split(':')[0]),
int.parse(e.horaFinal.toString().split(':')[1]));
if (now.isAfter(hourInitList) && now.isBefore(hourFinalList)) {
_listCardDiario.add(e);
}
});
}
loading = false;
});
}
#override
build(BuildContext context) {
return Scaffold(
backgroundColor: const Color(0xffDFE8EC),
drawer: const Navigation(),
appBar: AppBar(
title: Row(mainAxisAlignment: MainAxisAlignment.center, children: [
Image.network("https://eemandev.wd7.com.br/img/logo-branco.png",
height: 50)
]),
backgroundColor: const Color(0xff006f99),
toolbarHeight: 70,
actions: [
Padding(
padding: EdgeInsets.only(right: 16),
child: InkWell(
onTap: () => redirectComunicados(),
child: Icon(Icons.mail),
),
)
]),
body: Padding(
padding: const EdgeInsets.all(26.0),
child: ListView(children: const [
CardAviso(),
CardAction(),
CardDiarioClasse(),
Calendario(),
])));
}
}
I've already made several attempts, including in one of the cards I put the life cycle with the codes below, but it doesn't work:
#override
void initState() {
super.initState();
WidgetsBinding.instance.addObserver(this);
getHorarioDiaAtual();
}
#override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
super.dispose();
}
#override
void didChangeAppLifecycleState(AppLifecycleState state) {
if (state == AppLifecycleState.inactive) {
setState(() {});
}
super.didChangeAppLifecycleState(state);
}