flutter_in_app_purchase_helper 0.1.0

flutter_in_app_purchase_helper: ^0.1.0 copied to clipboard

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_in_app_purchase_helper/flutter_in_app_purchase_helper.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'In-App Purchase Helper Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const PaymentScreen(),
    );
  }
}

class PaymentScreen extends StatefulWidget {
  const PaymentScreen({super.key});

  @override
  State<PaymentScreen> createState() => _PaymentScreenState();
}

class _PaymentScreenState extends State<PaymentScreen> {
  final FlutterInAppPurchaseHelper _helper = FlutterInAppPurchaseHelper();

  List<ProductDetails> _products = <ProductDetails>[];

  /// The selected product itself, rather than a title that has to be kept in
  /// sync with a second field.
  ProductDetails? _selected;

  bool _busy = false;

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

  Future<void> _initializePurchases() async {
    // Replace these with the product IDs you configured in Play Console and
    // App Store Connect.
    await _helper.initialize(
      productIds: <String>{'PRODUCT_ID_1', 'PRODUCT_ID_2'},
      onProductsFetched: (List<ProductDetails> products) {
        if (!mounted) {
          return;
        }
        setState(() => _products = products);
      },
      onPurchaseSuccess: (PurchaseDetails purchase) {
        // Verify `purchase.verificationData` against your server before
        // unlocking anything in a production app.
        setState(() => _busy = false);
        _show('Unlocked ${purchase.productID}');
      },
      onPurchasePending: (PurchaseDetails purchase) {
        _show('Waiting for approval…');
      },
      onPurchaseCanceled: (PurchaseDetails purchase) {
        setState(() => _busy = false);
      },
      onPurchaseError: (String error) {
        setState(() => _busy = false);
        _show('Error: $error');
      },
    );
  }

  /// Purchase updates can arrive after this screen is popped.
  void _show(String message) {
    if (!mounted) {
      return;
    }
    ScaffoldMessenger.of(context)
        .showSnackBar(SnackBar(content: Text(message)));
  }

  Future<void> _buy() async {
    final ProductDetails? product = _selected;
    if (product == null) {
      _show('Please select a plan.');
      return;
    }

    setState(() => _busy = true);
    final bool sent = await _helper.buyProduct(product, (String error) {
      setState(() => _busy = false);
      _show('Error: $error');
    });

    if (!sent) {
      setState(() => _busy = false);
    }
  }

  @override
  void dispose() {
    _helper.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Choose a plan'),
        actions: <Widget>[
          // The App Store requires a restore entry point for non-consumables.
          TextButton(
            onPressed: () => _helper.restorePurchases(onError: _show),
            child: const Text('Restore'),
          ),
        ],
      ),
      body: _products.isEmpty
          ? const Center(child: Text('No products available.'))
          : ListView.builder(
              padding: const EdgeInsets.all(16),
              itemCount: _products.length,
              itemBuilder: (BuildContext context, int index) {
                final ProductDetails product = _products[index];
                return PlanCard(
                  product: product,
                  isActive: _selected?.id == product.id,
                  onTap: () => setState(
                    () => _selected =
                        _selected?.id == product.id ? null : product,
                  ),
                );
              },
            ),
      bottomNavigationBar: Padding(
        padding: const EdgeInsets.all(16),
        child: ElevatedButton(
          onPressed: _busy || _selected == null ? null : _buy,
          child: _busy
              ? const SizedBox.square(
                  dimension: 16,
                  child: CircularProgressIndicator(strokeWidth: 2),
                )
              : const Text('Subscribe'),
        ),
      ),
    );
  }
}

class PlanCard extends StatelessWidget {
  const PlanCard({
    super.key,
    required this.product,
    required this.isActive,
    required this.onTap,
  });

  final ProductDetails product;
  final bool isActive;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return Card(
      elevation: isActive ? 8 : 1,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(16),
        side: BorderSide(
          color: isActive
              ? Theme.of(context).colorScheme.primary
              : Colors.transparent,
          width: 2,
        ),
      ),
      child: ListTile(
        onTap: onTap,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        leading: Icon(
          isActive ? Icons.check_circle : Icons.circle_outlined,
          color: Theme.of(context).colorScheme.primary,
        ),
        title: Text(product.title, overflow: TextOverflow.ellipsis),
        subtitle: Text(product.description, overflow: TextOverflow.ellipsis),
        trailing: Text(
          product.price,
          style: Theme.of(context).textTheme.titleMedium,
        ),
      ),
    );
  }
}