Change bool in initState flutter - flutter

Question

I have a page with this code:
class _HomeScreenState extends State<HomeScreen> {
bool isFirstLoading = true;
#override
void initState() {
super.initState();
if (isFirstLoading) {
getInfo();
setState(() {
isFirstLoading = false;
});
} else {
getInfoFromSharedPref();
}
}
Future<http.Response> getInfo() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
Loader.show(context,
isAppbarOverlay: true,
isBottomBarOverlay: true,
progressIndicator: CircularProgressIndicator());
var url = kLinkAPI + "/getInfo";
var response =
await http.post(url, headers: {"Content-Type": "application/json"});
var resObj = jsonDecode(response.body);
if (response != null) {
setState(() {
if (resObj.length > 0) {
address = resObj[0]['address'];
countryInfo = resObj[0]['country_info'];
phone = resObj[0]['phone'];
latitude = resObj[0]['latitude'];
longitude = resObj[0]['longitude'];
isFirstLoading = false;
prefs.setString('address', address);
prefs.setString('countryInfo', countryInfo);
prefs.setString('phone', phone);
prefs.setString('latitude', latitude);
prefs.setString('longitude', longitude);
}
});
}
Loader.hide();
}
void getInfoFromSharedPref() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
address = prefs.getString('address');
countryInfo = prefs.getString('countryInfo');
phone = prefs.getString('phone');
latitude = prefs.getString('latitude');
longitude = prefs.getString('longitude');
});
}
}
I would like to make sure that the first time I enter the page, the isFirstLoading variable is set to false and then calls the getInfo function with the http call while if it is false it takes from the shared preferences.
isFirstLoading is now always true
how could I solve?

Answer 1

I think you're overcomplicating your code. Let me know if this solves your issue.:
class _HomeScreenState extends State<HomeScreen> {
SharedPreferences prefs;
#override
void initState() {
super.initState();
getInfo();
}
// ...
}
Now, the first time this widget is inserted into the tree:
initState() will be called once.
Therefore, getInfo() will be called. getInfo() will make the http call and update the prefs variable using setState, which you have already done.
Whenever the widget is reloaded, the prefs variable will not be lost since it is a stateful widget.
Next, if you would like to save the preference settings locally instead of making an http call every time the user opens the app, you should handle that inside of getInfo() itself. Something like this:
getInfo() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
if (prefs.getBool("isFirstLoading") == false) {
// setState to update prefs variable
} else {
// make http call
// save prefs (optional)
// setState to update prefs variable
}
}

Answer 2

If I undestand correctly, you are trying to only call the getInfo method on the first load, and the getInfoFromSharedPref all the other time.
My suggestion is to save the isFirstLoading bool as a preference like so:
class _HomeScreenState extends State<HomeScreen> {
SharedPreferences prefs = await SharedPreferences.getInstance();
bool isFirstLoading = prefs.getBool("isFirstLoading") ?? true;
#override
void initState() async {
super.initState();
if (isFirstLoading) {
await getInfo();
await prefs.setBool("isFirstLoading", false);
isFirstLoading = false;
} else {
getInfoFromSharedPref();
}
}
Future<http.Response> getInfo() async {
// …
}
void getInfoFromSharedPref() async {
// …
}
}