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Description:

onepref

This package is endorsed, which means you can simply use shared_preferences and in_app_purchase normally.
This package will be automatically included in your app when you do, so you do not need to add it to your pubspec.yaml.
Features #
OnePref offers the same functionality shared_preferences package offers but in a friendly way and it has other in app purchase
functions to fast track your development when you add in app purchase in your application.
Getting started #
flutter pub add onepref
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import 'package:onepref/onepref.dart'
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//In your main.dart
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await OnePref.init();
runApp(const MyApp());
}

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Usage #
To Write

OnePref.setString("key","value here");
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Get the Value

const value = OnePref.getString("key");
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To get Products #
//declare these

late final List<String> _notFoundIds = <String>[];
late final List<ProductDetails> _products = <ProductDetails>[];
late final List<PurchaseDetails> _purchases = <PurchaseDetails>[];
late bool _isAvailable = false;
late bool _purchasePending = false;

IApEngine iApEngine = IApEngine();

ATTENTATION !!!!! ATTENTATION !!!!! ATTENTATION !!!!!
//(Please make sure you have configured in App purchase for your app)

@override
void initState() {
super.initState();

iApEngine.inAppPurchase.purchaseStream.listen(
(List<PurchaseDetails> purchaseDetailsList) {
//listen to the purchases
listenToPurchaseUpdated(purchaseDetailsList);
}, onDone: () {}, onError: (Object error) {});

getProducts();// calling get products
}

void getProducts() async {
// Querying the products from Google Play
await iApEngine.getIsAvailable().then((isAvailable) async {
if (isAvailable) {
await iApEngine
.queryProducts(Constants.storeProductIds)
.then((value) => {
setState(() {
_isAvailable = isAvailable;
_products.addAll(value
.productDetails); // Setting the returned products here.
_notFoundIds.addAll(value
.notFoundIDs); // Setting the returned notProductIds here.
_purchasePending = false;
})
});
}
});
}

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HandlePurchase #
TextButton(onPressed: () {
iApEngine.handlePurchase(_products[selectedProduct ?? 0],Constants.storeProductIds);},
child: Text("Buy $reward",
textAlign: TextAlign.center,
style: const TextStyle(
color: Colors.white, fontSize: 14,
fontWeight: FontWeight.normal,
),
),
),
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