/
main.dart
510 lines (470 loc) · 17.2 KB
/
main.dart
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:in_app_purchase/in_app_purchase.dart';
import 'package:in_app_purchase_android/billing_client_wrappers.dart';
import 'package:in_app_purchase_android/in_app_purchase_android.dart';
import 'package:in_app_purchase_storekit/in_app_purchase_storekit.dart';
import 'package:in_app_purchase_storekit/store_kit_wrappers.dart';
import 'consumable_store.dart';
void main() {
WidgetsFlutterBinding.ensureInitialized();
runApp(_MyApp());
}
// Auto-consume must be true on iOS.
// To try without auto-consume on another platform, change `true` to `false` here.
final bool _kAutoConsume = Platform.isIOS || true;
const String _kConsumableId = 'consumable';
const String _kUpgradeId = 'upgrade';
const String _kSilverSubscriptionId = 'subscription_silver';
const String _kGoldSubscriptionId = 'subscription_gold';
const List<String> _kProductIds = <String>[
_kConsumableId,
_kUpgradeId,
_kSilverSubscriptionId,
_kGoldSubscriptionId,
];
class _MyApp extends StatefulWidget {
@override
State<_MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<_MyApp> {
final InAppPurchase _inAppPurchase = InAppPurchase.instance;
late StreamSubscription<List<PurchaseDetails>> _subscription;
List<String> _notFoundIds = <String>[];
List<ProductDetails> _products = <ProductDetails>[];
List<PurchaseDetails> _purchases = <PurchaseDetails>[];
List<String> _consumables = <String>[];
bool _isAvailable = false;
bool _purchasePending = false;
bool _loading = true;
String? _queryProductError;
@override
void initState() {
final Stream<List<PurchaseDetails>> purchaseUpdated =
_inAppPurchase.purchaseStream;
_subscription =
purchaseUpdated.listen((List<PurchaseDetails> purchaseDetailsList) {
_listenToPurchaseUpdated(purchaseDetailsList);
}, onDone: () {
_subscription.cancel();
}, onError: (Object error) {
// handle error here.
});
initStoreInfo();
super.initState();
}
Future<void> initStoreInfo() async {
final bool isAvailable = await _inAppPurchase.isAvailable();
if (!isAvailable) {
setState(() {
_isAvailable = isAvailable;
_products = <ProductDetails>[];
_purchases = <PurchaseDetails>[];
_notFoundIds = <String>[];
_consumables = <String>[];
_purchasePending = false;
_loading = false;
});
return;
}
if (Platform.isIOS) {
final InAppPurchaseStoreKitPlatformAddition iosPlatformAddition =
_inAppPurchase
.getPlatformAddition<InAppPurchaseStoreKitPlatformAddition>();
await iosPlatformAddition.setDelegate(ExamplePaymentQueueDelegate());
}
final ProductDetailsResponse productDetailResponse =
await _inAppPurchase.queryProductDetails(_kProductIds.toSet());
if (productDetailResponse.error != null) {
setState(() {
_queryProductError = productDetailResponse.error!.message;
_isAvailable = isAvailable;
_products = productDetailResponse.productDetails;
_purchases = <PurchaseDetails>[];
_notFoundIds = productDetailResponse.notFoundIDs;
_consumables = <String>[];
_purchasePending = false;
_loading = false;
});
return;
}
if (productDetailResponse.productDetails.isEmpty) {
setState(() {
_queryProductError = null;
_isAvailable = isAvailable;
_products = productDetailResponse.productDetails;
_purchases = <PurchaseDetails>[];
_notFoundIds = productDetailResponse.notFoundIDs;
_consumables = <String>[];
_purchasePending = false;
_loading = false;
});
return;
}
final List<String> consumables = await ConsumableStore.load();
setState(() {
_isAvailable = isAvailable;
_products = productDetailResponse.productDetails;
_notFoundIds = productDetailResponse.notFoundIDs;
_consumables = consumables;
_purchasePending = false;
_loading = false;
});
}
@override
void dispose() {
if (Platform.isIOS) {
final InAppPurchaseStoreKitPlatformAddition iosPlatformAddition =
_inAppPurchase
.getPlatformAddition<InAppPurchaseStoreKitPlatformAddition>();
iosPlatformAddition.setDelegate(null);
}
_subscription.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
final List<Widget> stack = <Widget>[];
if (_queryProductError == null) {
stack.add(
ListView(
children: <Widget>[
_buildConnectionCheckTile(),
_buildProductList(),
_buildConsumableBox(),
_buildRestoreButton(),
],
),
);
} else {
stack.add(Center(
child: Text(_queryProductError!),
));
}
if (_purchasePending) {
stack.add(
const Stack(
children: <Widget>[
Opacity(
opacity: 0.3,
child: ModalBarrier(dismissible: false, color: Colors.grey),
),
Center(
child: CircularProgressIndicator(),
),
],
),
);
}
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('IAP Example'),
),
body: Stack(
children: stack,
),
),
);
}
Card _buildConnectionCheckTile() {
if (_loading) {
return const Card(child: ListTile(title: Text('Trying to connect...')));
}
final Widget storeHeader = ListTile(
leading: Icon(_isAvailable ? Icons.check : Icons.block,
color: _isAvailable
? Colors.green
: ThemeData.light().colorScheme.error),
title:
Text('The store is ${_isAvailable ? 'available' : 'unavailable'}.'),
);
final List<Widget> children = <Widget>[storeHeader];
if (!_isAvailable) {
children.addAll(<Widget>[
const Divider(),
ListTile(
title: Text('Not connected',
style: TextStyle(color: ThemeData.light().colorScheme.error)),
subtitle: const Text(
'Unable to connect to the payments processor. Has this app been configured correctly? See the example README for instructions.'),
),
]);
}
return Card(child: Column(children: children));
}
Card _buildProductList() {
if (_loading) {
return const Card(
child: ListTile(
leading: CircularProgressIndicator(),
title: Text('Fetching products...')));
}
if (!_isAvailable) {
return const Card();
}
const ListTile productHeader = ListTile(title: Text('Products for Sale'));
final List<ListTile> productList = <ListTile>[];
if (_notFoundIds.isNotEmpty) {
productList.add(ListTile(
title: Text('[${_notFoundIds.join(", ")}] not found',
style: TextStyle(color: ThemeData.light().colorScheme.error)),
subtitle: const Text(
'This app needs special configuration to run. Please see example/README.md for instructions.')));
}
// This loading previous purchases code is just a demo. Please do not use this as it is.
// In your app you should always verify the purchase data using the `verificationData` inside the [PurchaseDetails] object before trusting it.
// We recommend that you use your own server to verify the purchase data.
final Map<String, PurchaseDetails> purchases =
Map<String, PurchaseDetails>.fromEntries(
_purchases.map((PurchaseDetails purchase) {
if (purchase.pendingCompletePurchase) {
_inAppPurchase.completePurchase(purchase);
}
return MapEntry<String, PurchaseDetails>(purchase.productID, purchase);
}));
productList.addAll(_products.map(
(ProductDetails productDetails) {
final PurchaseDetails? previousPurchase = purchases[productDetails.id];
return ListTile(
title: Text(
productDetails.title,
),
subtitle: Text(
productDetails.description,
),
trailing: previousPurchase != null && Platform.isIOS
? IconButton(
onPressed: () => confirmPriceChange(context),
icon: const Icon(Icons.upgrade))
: TextButton(
style: TextButton.styleFrom(
backgroundColor: Colors.green[800],
foregroundColor: Colors.white,
),
onPressed: () {
late PurchaseParam purchaseParam;
if (Platform.isAndroid) {
// NOTE: If you are making a subscription purchase/upgrade/downgrade, we recommend you to
// verify the latest status of you your subscription by using server side receipt validation
// and update the UI accordingly. The subscription purchase status shown
// inside the app may not be accurate.
final GooglePlayPurchaseDetails? oldSubscription =
_getOldSubscription(productDetails, purchases);
purchaseParam = GooglePlayPurchaseParam(
productDetails: productDetails,
changeSubscriptionParam: (oldSubscription != null)
? ChangeSubscriptionParam(
oldPurchaseDetails: oldSubscription,
prorationMode:
ProrationMode.immediateWithTimeProration,
)
: null);
} else {
purchaseParam = PurchaseParam(
productDetails: productDetails,
);
}
if (productDetails.id == _kConsumableId) {
_inAppPurchase.buyConsumable(
purchaseParam: purchaseParam,
autoConsume: _kAutoConsume);
} else {
_inAppPurchase.buyNonConsumable(
purchaseParam: purchaseParam);
}
},
child: Text(productDetails.price),
),
);
},
));
return Card(
child: Column(
children: <Widget>[productHeader, const Divider()] + productList));
}
Card _buildConsumableBox() {
if (_loading) {
return const Card(
child: ListTile(
leading: CircularProgressIndicator(),
title: Text('Fetching consumables...')));
}
if (!_isAvailable || _notFoundIds.contains(_kConsumableId)) {
return const Card();
}
const ListTile consumableHeader =
ListTile(title: Text('Purchased consumables'));
final List<Widget> tokens = _consumables.map((String id) {
return GridTile(
child: IconButton(
icon: const Icon(
Icons.stars,
size: 42.0,
color: Colors.orange,
),
splashColor: Colors.yellowAccent,
onPressed: () => consume(id),
),
);
}).toList();
return Card(
child: Column(children: <Widget>[
consumableHeader,
const Divider(),
GridView.count(
crossAxisCount: 5,
shrinkWrap: true,
padding: const EdgeInsets.all(16.0),
children: tokens,
)
]));
}
Widget _buildRestoreButton() {
if (_loading) {
return Container();
}
return Padding(
padding: const EdgeInsets.all(4.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
TextButton(
style: TextButton.styleFrom(
backgroundColor: Theme.of(context).primaryColor,
foregroundColor: Colors.white,
),
onPressed: () => _inAppPurchase.restorePurchases(),
child: const Text('Restore purchases'),
),
],
),
);
}
Future<void> consume(String id) async {
await ConsumableStore.consume(id);
final List<String> consumables = await ConsumableStore.load();
setState(() {
_consumables = consumables;
});
}
void showPendingUI() {
setState(() {
_purchasePending = true;
});
}
Future<void> deliverProduct(PurchaseDetails purchaseDetails) async {
// IMPORTANT!! Always verify purchase details before delivering the product.
if (purchaseDetails.productID == _kConsumableId) {
await ConsumableStore.save(purchaseDetails.purchaseID!);
final List<String> consumables = await ConsumableStore.load();
setState(() {
_purchasePending = false;
_consumables = consumables;
});
} else {
setState(() {
_purchases.add(purchaseDetails);
_purchasePending = false;
});
}
}
void handleError(IAPError error) {
setState(() {
_purchasePending = false;
});
}
Future<bool> _verifyPurchase(PurchaseDetails purchaseDetails) {
// IMPORTANT!! Always verify a purchase before delivering the product.
// For the purpose of an example, we directly return true.
return Future<bool>.value(true);
}
void _handleInvalidPurchase(PurchaseDetails purchaseDetails) {
// handle invalid purchase here if _verifyPurchase` failed.
}
Future<void> _listenToPurchaseUpdated(
List<PurchaseDetails> purchaseDetailsList) async {
for (final PurchaseDetails purchaseDetails in purchaseDetailsList) {
if (purchaseDetails.status == PurchaseStatus.pending) {
showPendingUI();
} else {
if (purchaseDetails.status == PurchaseStatus.error) {
handleError(purchaseDetails.error!);
} else if (purchaseDetails.status == PurchaseStatus.purchased ||
purchaseDetails.status == PurchaseStatus.restored) {
final bool valid = await _verifyPurchase(purchaseDetails);
if (valid) {
unawaited(deliverProduct(purchaseDetails));
} else {
_handleInvalidPurchase(purchaseDetails);
return;
}
}
if (Platform.isAndroid) {
if (!_kAutoConsume && purchaseDetails.productID == _kConsumableId) {
final InAppPurchaseAndroidPlatformAddition androidAddition =
_inAppPurchase.getPlatformAddition<
InAppPurchaseAndroidPlatformAddition>();
await androidAddition.consumePurchase(purchaseDetails);
}
}
if (purchaseDetails.pendingCompletePurchase) {
await _inAppPurchase.completePurchase(purchaseDetails);
}
}
}
}
Future<void> confirmPriceChange(BuildContext context) async {
// Price changes for Android are not handled by the application, but are
// instead handled by the Play Store. See
// https://developer.android.com/google/play/billing/price-changes for more
// information on price changes on Android.
if (Platform.isIOS) {
final InAppPurchaseStoreKitPlatformAddition iapStoreKitPlatformAddition =
_inAppPurchase
.getPlatformAddition<InAppPurchaseStoreKitPlatformAddition>();
await iapStoreKitPlatformAddition.showPriceConsentIfNeeded();
}
}
GooglePlayPurchaseDetails? _getOldSubscription(
ProductDetails productDetails, Map<String, PurchaseDetails> purchases) {
// This is just to demonstrate a subscription upgrade or downgrade.
// This method assumes that you have only 2 subscriptions under a group, 'subscription_silver' & 'subscription_gold'.
// The 'subscription_silver' subscription can be upgraded to 'subscription_gold' and
// the 'subscription_gold' subscription can be downgraded to 'subscription_silver'.
// Please remember to replace the logic of finding the old subscription Id as per your app.
// The old subscription is only required on Android since Apple handles this internally
// by using the subscription group feature in iTunesConnect.
GooglePlayPurchaseDetails? oldSubscription;
if (productDetails.id == _kSilverSubscriptionId &&
purchases[_kGoldSubscriptionId] != null) {
oldSubscription =
purchases[_kGoldSubscriptionId]! as GooglePlayPurchaseDetails;
} else if (productDetails.id == _kGoldSubscriptionId &&
purchases[_kSilverSubscriptionId] != null) {
oldSubscription =
purchases[_kSilverSubscriptionId]! as GooglePlayPurchaseDetails;
}
return oldSubscription;
}
}
/// Example implementation of the
/// [`SKPaymentQueueDelegate`](https://developer.apple.com/documentation/storekit/skpaymentqueuedelegate?language=objc).
///
/// The payment queue delegate can be implementated to provide information
/// needed to complete transactions.
class ExamplePaymentQueueDelegate implements SKPaymentQueueDelegateWrapper {
@override
bool shouldContinueTransaction(
SKPaymentTransactionWrapper transaction, SKStorefrontWrapper storefront) {
return true;
}
@override
bool shouldShowPriceConsent() {
return false;
}
}