Develop Reference

the flutter audio wiveforms package does not display waveforms

I hope you are well, I have a big problem with the flutter audio waveforms package, indeed I want to display the waveforms of my voice files in a folder, but they are not displayed and when I display the value of playerController.bufferData I get a null, please how can I manage this problem, I have already spent days on it.
Sincerely
below are my classes
import 'dart:async';
import 'dart:io';
import 'package:audio_recorder/AudioWaveFormsWidget.dart';
import 'package:audio_waveforms/audio_waveforms.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:record/record.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Audio Recorder',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Audio Recorder'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
//late final PlayerController playerController1;
final record = Record();
int _recordDuration = 0;
Timer? _timer;
RecordState _recordState = RecordState.stop;
StreamSubscription<RecordState>? _recordSub;
final List<File> _audioFile = [];
#override
void initState() {
super.initState();
//Listening record state
_recordSub = record.onStateChanged().listen((recordState) {
setState(() => _recordState = recordState);
});
initCheckPermission();
setState(() {
initFileInDir();
});
}
#override
void dispose() {
_timer?.cancel();
_recordSub?.cancel();
record.dispose();
super.dispose();
}
Future initCheckPermission() async {
final statusMicrophone = await Permission.microphone.request();
final statusStorage = await Permission.storage.request();
if (statusMicrophone != PermissionStatus.granted ||
statusStorage != PermissionStatus.granted) {
await Permission.microphone.request();
await Permission.storage.request();
}
}
void _startTimer() {
_timer?.cancel();
_timer = Timer.periodic(const Duration(seconds: 1), (Timer t) {
setState(() => _recordDuration++);
});
}
Widget _buildText() {
if (_recordState != RecordState.stop) {
return _buildTimer();
}
return const Text("Waiting to record");
}
String _formatNumber(int number) {
String numberStr = number.toString();
if (number < 10) {
numberStr = '0$numberStr';
}
return numberStr;
}
Widget _buildTimer() {
final String minutes = _formatNumber(_recordDuration ~/ 60);
final String seconds = _formatNumber(_recordDuration % 60);
return Text(
'$minutes : $seconds',
style: const TextStyle(color: Colors.red),
);
}
Future<Directory> _getDir() async {
//Check platform and adjust settings
final tempDir = Platform.isAndroid
? await getExternalStorageDirectory()
: await getApplicationDocumentsDirectory();
Directory finalPath;
if (Platform.isAndroid) {
String buildDir =
tempDir!.path.replaceFirst("/data/", "/media/").split("files").first;
buildDir += "AudioRecorder"; // Plus ajout du nom de l'application
return finalPath = await Directory(buildDir).create(recursive: true);
} else {
return finalPath = await Directory(tempDir!.path).create(recursive: true);
}
}
void initFileInDir() async {
Directory finalPath = await _getDir();
var exists = await finalPath.exists();
if (exists) {
finalPath.list(recursive: false).forEach((element) {
File file = File(element.path);
_audioFile.add(file);
});
}
}
Widget _buildStopAndPlayIcon() {
if (_recordState != RecordState.stop) {
return const Icon(Icons.stop);
} else {
return const Icon(Icons.mic);
}
}
Future<void> _start() async {
Directory finalPath = await _getDir();
//Start recording
await record.start(
path: '${finalPath.path}/${DateTime.now().millisecondsSinceEpoch}.m4a',
encoder: AudioEncoder.aacLc, // by default
bitRate: 128000, // by default
samplingRate: 44100);
_recordDuration = 0;
_startTimer();
}
Future<File?> _stop() async {
_timer?.cancel();
_recordDuration = 0;
final path = await record.stop();
File? file;
if (path != null) {
file = File(path);
if (kDebugMode) {
print("--------------------------$path");
}
}
return file;
}
Future<void> _pause() async {
_timer?.cancel();
await record.pause();
}
Future<void> _resume() async {
_startTimer();
await record.resume();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Padding(
padding: const EdgeInsets.all(10.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: [
LimitedBox(
maxHeight: 650,
child: ListView.builder(
shrinkWrap: true,
itemCount: _audioFile.length,
itemBuilder: (context, index) {
var data = _audioFile[index];
return AudioWaveFormsWidget(path: data);
},
),
),
const Spacer(),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
_buildText(),
ElevatedButton(
onPressed: () async {
if (_recordState == RecordState.stop) {
_start();
} else {
File? newFile = await _stop();
setState((){ _audioFile.add(newFile!);});
}
},
style: ButtonStyle(
elevation: MaterialStateProperty.all(0),
shape: MaterialStateProperty.all(RoundedRectangleBorder(
borderRadius: BorderRadius.circular(100),
side: BorderSide.none))),
child: _buildStopAndPlayIcon(),
)
],
),
],
),
),
// This trailing comma makes auto-formatting nicer for build methods.
);
}
}
import 'dart:io';
import 'package:audio_waveforms/audio_waveforms.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
class AudioWaveFormsWidget extends StatefulWidget {
final File path;
//final PlayerController playerController1;
const AudioWaveFormsWidget({Key? key, required this.path}) : super(key: key);
#override
State<AudioWaveFormsWidget> createState() => _AudioWaveFormsWidgetState();
}
class _AudioWaveFormsWidgetState extends State<AudioWaveFormsWidget> {
late final PlayerController playerController1;
#override
void initState() {
playerController1 = PlayerController()
..addListener(() {
if (mounted) setState(() {});
});
_preparePlayer();
super.initState();
}
void _preparePlayer() async {
bool exist = await widget.path.exists();
if (exist) {
playerController1.preparePlayer(widget.path.path);
}
print("--------------------------------${playerController1.bufferData}");
}
void _playOrPausePlayer(PlayerController controller) async {
debugPrint(
'****************************************${controller.playerState.toString()}');
controller.playerState == PlayerState.playing
? await controller.pausePlayer()
: await controller.startPlayer(finishMode: FinishMode.pause);
}
#override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10.0),
shape: BoxShape.rectangle,
color: Colors.lightGreenAccent,
),
child: Row(
children: [
IconButton(
onPressed: () {
_playOrPausePlayer(playerController1);
},
icon: playerController1.playerState == PlayerState.playing
? const Icon(Icons.pause)
: const Icon(Icons.play_arrow)),
AudioFileWaveforms(
density: 1.0,
enableSeekGesture: true,
size: const Size(100.0, 70.0),
playerController: playerController1),
],
)),
);
}
}

if you're trying to record, try setting the bitRate to 48000 (worked for me on iOS when it wasn't showing the waveforms when recording).
final RecorderController recorderController = RecorderController()
..androidEncoder = AndroidEncoder.aac
..androidOutputFormat = AndroidOutputFormat.mpeg4
..iosEncoder = IosEncoder.kAudioFormatMPEG4AAC
..sampleRate = 44100
..bitRate = 48000;

How to Retrieve Image/ Screenshot from Application Document Directory Flutter?

I'm trying to build an in app gallery function where I can screenshot certain widgets in the app and then display it inside the app's internal gallery screen. Currently, I am using the Flutter screenshot package and then I save the screenshot to the Application document directory path. But how do I retrieve the images back and display them later on the app again?

Here's how I've done it before using the path_provider package.
(this is only for one image, but you can adapt the code to retrieve multiple images).
Create an uninitialized variable:
Image? image;
then, in the initState:
void initState() {
_loadImage();
super.initState();
}
Here is the _loadImage()
Future<void> _loadImage() async {
final path = await imagePath;
final _doesTheImageExist = File('${path}/qr.png').existsSync();
print(_doesTheImageExist);
if (_doesTheImageExist == true) {
setState(() {
image = Image.file(File("${path}/qr.png"));
});
} else {
print('no');
setState(() {
image = null;
});
}
}
Create a getter to get the image path imagePath:
Future<String> get imagePath async {
final directory = (await getApplicationDocumentsDirectory()).path;
return '$directory/qr.png';
}
then, create a function to save the image to the device:
Future<void> _captureAndSaveQRCode() async {
final imageDirectory = await imagePath;
await _screenshotController.captureAndSave(imageDirectory,
fileName: 'qr.png');
await _loadImage();
// setState(() {});
}
Here is the complete runnable example:
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:qr_flutter/qr_flutter.dart';
import 'package:screenshot/screenshot.dart';
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const Scaffold(
body: QrCode(),
),
);
}
}
class QrCode extends StatefulWidget {
const QrCode({Key? key}) : super(key: key);
#override
State<QrCode> createState() => _QrCodeState();
}
class _QrCodeState extends State<QrCode> {
final _screenshotController = ScreenshotController();
Image? image;
#override
Widget build(BuildContext context) {
return Scaffold(
body: image != null
? Center(
child: Padding(
padding: const EdgeInsets.only(
top: 100.0,
),
child: Column(
children: [
image!,
],
),
))
: Center(
child: Column(
children: [
TextButton(
onPressed: _captureAndSaveQRCode,
child: Text("Save QrCode")),
Screenshot(
controller: _screenshotController,
child: _buildQRImage('data'))
],
),
),
);
}
Widget _buildQRImage(String data) {
return QrImage(
data: data,
size: 250.0,
version: QrVersions.auto,
errorCorrectionLevel: QrErrorCorrectLevel.H,
gapless: false,
foregroundColor: Colors.black,
backgroundColor: Colors.white,
);
}
Future<String> get imagePath async {
final directory = (await getApplicationDocumentsDirectory()).path;
return '$directory/qr.png';
}
Future<void> _loadImage() async {
final path = await imagePath;
final _doesTheImageExist = File('${path}/qr.png').existsSync();
print(_doesTheImageExist);
if (_doesTheImageExist == true) {
setState(() {
image = Image.file(File("${path}/qr.png"));
});
} else {
setState(() {
image = null;
});
}
}
Future<void> _captureAndSaveQRCode() async {
final imageDirectory = await imagePath;
await _screenshotController.captureAndSave(imageDirectory,
fileName: 'qr.png');
await _loadImage();
}
#override
void initState() {
_loadImage();
super.initState();
}
}

ImagePicker PlatformException that occurs only on packaged build

I'm building a simple flutter app, which needs to takes pictures. For that i'm using ImagePicker.
When built into an APK, an error is returned when _getImage is called:
"Pick image error.PlatformException(error,null,null)[...]"
When executed through flutter run on the same device, it works as expected.
Relevant part of the code:
class _BodyState extends State<Body> {
final ImagePicker _picker = ImagePicker();
XFile? _imageFile;
dynamic _pickImageError;
String? _retrieveDataError;
void _getImage(ImageSource source) async {
try {
final pickedFile = await _picker.pickImage(
source: source,
maxWidth: 720,
maxHeight: 1280,
imageQuality: 80,
// preferredCameraDevice: CameraDevice.rear,
);
setState(() {
_imageFile = pickedFile;
});
} catch (e) {
setState(() {
_pickImageError = e;
});
}
}
Widget _previewImages() {
final Text? retrieveError = _getRetrieveErrorWidget();
Size size = MediaQuery.of(context).size;
if (retrieveError != null) {
return retrieveError;
}
if (_imageFile != null) {
return CircleAvatar(
backgroundColor: Colors.transparent,
radius: 150,
backgroundImage: FileImage(File(_imageFile!.path)),
);
} else if (_pickImageError != null) {
return Text(
'Pick image error: $_pickImageError',
textAlign: TextAlign.center,
);
} else {
return CircleAvatar(
backgroundColor: Colors.transparent,
radius: 150,
child: Image.asset(
"assets/images/user.png",
width: size.width,
),
);
}
}
Text? _getRetrieveErrorWidget() {
if (_retrieveDataError != null) {
final Text result = Text(_retrieveDataError!);
_retrieveDataError = null;
return result;
}
return null;
}
Future<void> retrieveLostData() async {
final LostDataResponse response = await _picker.retrieveLostData();
if (response.isEmpty) {
return;
}
if (response.file != null) {
setState(() {
_imageFile = response.file;
});
} else {
_retrieveDataError = response.exception!.code;
}
}
#override
Widget build(BuildContext context) {
return Background(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Center(
child: FutureBuilder<void>(
future: retrieveLostData(),
builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
case ConnectionState.waiting:
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
case ConnectionState.done:
return _previewImages();
default:
if (snapshot.hasError) {
return Text(
'Pick image/video error: ${snapshot.error}}',
textAlign: TextAlign.center,
);
} else {
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
}
}
},
)
//: _previewImages(),
),
Error log (couldn't copy it)
How it should look like

Flutter IAP - Error you already own this item

I'm trying to implement Flutter InApp purchases on Consumables but I keep getting the following - error you already own this item when I try to buy again.
I want the user to buy over and over again.
This is happening on android.
I'm using in_app_purchase: ^0.3.4+5
I used the code in official docs for the plugin -
// Copyright 2019 The Chromium 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/store_kit_wrappers.dart';
import 'consumable_store.dart';
void main() {
// For play billing library 2.0 on Android, it is mandatory to call
// [enablePendingPurchases](https://developer.android.com/reference/com/android/billingclient/api/BillingClient.Builder.html#enablependingpurchases)
// as part of initializing the app.
InAppPurchaseConnection.enablePendingPurchases();
runApp(MyApp());
}
// Original code link: https://github.com/flutter/plugins/blob/master/packages/in_app_purchase/example/lib/main.dart
const bool kAutoConsume = true;
const String _kConsumableId = '';
const String _kSubscriptionId = '';
const List<String> _kProductIds = <String>[
_kConsumableId,
'noadforfifteendays',
_kSubscriptionId
];
// TODO: Please Add your android product ID here
const List<String> _kAndroidProductIds = <String>[
''
];
//Example
//const List<String> _kAndroidProductIds = <String>[
// 'ADD_YOUR_ANDROID_PRODUCT_ID_1',
// 'ADD_YOUR_ANDROID_PRODUCT_ID_2',
// 'ADD_YOUR_ANDROID_PRODUCT_ID_3'
//];
// TODO: Please Add your iOS product ID here
const List<String> _kiOSProductIds = <String>[
''
];
//Example
//const List<String> _kiOSProductIds = <String>[
// 'ADD_YOUR_IOS_PRODUCT_ID_1',
// 'ADD_YOUR_IOS_PRODUCT_ID_2',
// 'ADD_YOUR_IOS_PRODUCT_ID_3'
//];
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
final InAppPurchaseConnection _connection = InAppPurchaseConnection.instance;
StreamSubscription<List<PurchaseDetails>> _subscription;
List<String> _notFoundIds = [];
List<ProductDetails> _products = [];
List<PurchaseDetails> _purchases = [];
List<String> _consumables = [];
bool _isAvailable = false;
bool _purchasePending = false;
bool _loading = true;
String _queryProductError;
#override
void initState() {
DateTime currentDate = DateTime.now();
DateTime noADDate;
var fiftyDaysFromNow = currentDate.add(new Duration(days: 50));
print('${fiftyDaysFromNow.month} - ${fiftyDaysFromNow.day} - ${fiftyDaysFromNow.year} ${fiftyDaysFromNow.hour}:${fiftyDaysFromNow.minute}');
Stream purchaseUpdated =
InAppPurchaseConnection.instance.purchaseUpdatedStream;
_subscription = purchaseUpdated.listen((purchaseDetailsList) {
_listenToPurchaseUpdated(purchaseDetailsList);
}, onDone: () {
_subscription.cancel();
}, onError: (error) {
// handle error here.
});
initStoreInfo();
super.initState();
}
Future<void> initStoreInfo() async {
final bool isAvailable = await _connection.isAvailable();
if (!isAvailable) {
setState(() {
_isAvailable = isAvailable;
_products = [];
_purchases = [];
_notFoundIds = [];
_consumables = [];
_purchasePending = false;
_loading = false;
});
return;
}
ProductDetailsResponse productDetailResponse =
await _connection.queryProductDetails(Platform.isIOS ? _kiOSProductIds.toSet() : _kAndroidProductIds.toSet());//_kProductIds.toSet());
if (productDetailResponse.error != null) {
setState(() {
_queryProductError = productDetailResponse.error.message;
_isAvailable = isAvailable;
_products = productDetailResponse.productDetails;
_purchases = [];
_notFoundIds = productDetailResponse.notFoundIDs;
_consumables = [];
_purchasePending = false;
_loading = false;
});
return;
}
if (productDetailResponse.productDetails.isEmpty) {
setState(() {
_queryProductError = null;
_isAvailable = isAvailable;
_products = productDetailResponse.productDetails;
_purchases = [];
_notFoundIds = productDetailResponse.notFoundIDs;
_consumables = [];
_purchasePending = false;
_loading = false;
});
return;
}
final QueryPurchaseDetailsResponse purchaseResponse =
await _connection.queryPastPurchases();
if (purchaseResponse.error != null) {
// handle query past purchase error..
}
final List<PurchaseDetails> verifiedPurchases = [];
for (PurchaseDetails purchase in purchaseResponse.pastPurchases) {
if (await _verifyPurchase(purchase)) {
verifiedPurchases.add(purchase);
}
}
List<String> consumables = await ConsumableStore.load();
setState(() {
_isAvailable = isAvailable;
_products = productDetailResponse.productDetails;
_purchases = verifiedPurchases;
_notFoundIds = productDetailResponse.notFoundIDs;
_consumables = consumables;
_purchasePending = false;
_loading = false;
});
}
#override
void dispose() {
_subscription.cancel();
super.dispose();
}
#override
Widget build(BuildContext context) {
List<Widget> stack = [];
if (_queryProductError == null) {
stack.add(
ListView(
children: [
_buildConnectionCheckTile(),
_buildProductList(),
_buildConsumableBox(),
],
),
);
} else {
stack.add(Center(
child: Text(_queryProductError),
));
}
if (_purchasePending) {
stack.add(
Stack(
children: [
Opacity(
opacity: 0.3,
child: const 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 Card(child: ListTile(title: const Text('Trying to connect...')));
}
final Widget storeHeader = ListTile(
leading: Icon(_isAvailable ? Icons.check : Icons.block,
color: _isAvailable ? Colors.green : ThemeData.light().errorColor),
title: Text(
'The store is ' + (_isAvailable ? 'available' : 'unavailable') + '.'),
);
final List<Widget> children = <Widget>[storeHeader];
if (!_isAvailable) {
children.addAll([
Divider(),
ListTile(
title: Text('Not connected',
style: TextStyle(color: ThemeData.light().errorColor)),
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 Card(
child: (ListTile(
leading: CircularProgressIndicator(),
title: Text('Fetching products...'))));
}
if (!_isAvailable) {
return Card();
}
final ListTile productHeader = ListTile(title: Text('Products for Sale'));
List<ListTile> productList = <ListTile>[];
if (_notFoundIds.isNotEmpty) {
productList.add(ListTile(
title: Text('[${_notFoundIds.join(", ")}] not found',
style: TextStyle(color: ThemeData.light().errorColor)),
subtitle: 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 verity the purchase data.
Map<String, PurchaseDetails> purchases =
Map.fromEntries(_purchases.map((PurchaseDetails purchase) {
if (purchase.pendingCompletePurchase) {
InAppPurchaseConnection.instance.completePurchase(purchase);
}
return MapEntry<String, PurchaseDetails>(purchase.productID, purchase);
}));
productList.addAll(_products.map(
(ProductDetails productDetails) {
PurchaseDetails previousPurchase = purchases[productDetails.id];
return ListTile(
title: Text(
productDetails.title,
),
subtitle: Text(
productDetails.description,
),
trailing: previousPurchase != null
? Icon(Icons.check)
: FlatButton(
child: Text(productDetails.price),
color: Colors.green[800],
textColor: Colors.white,
onPressed: () {
PurchaseParam purchaseParam = PurchaseParam(
productDetails: productDetails,
applicationUserName: null,
sandboxTesting: false);
if (productDetails.id == _kConsumableId) {
_connection.buyConsumable(
purchaseParam: purchaseParam,
autoConsume: kAutoConsume || Platform.isIOS);
} else {
_connection.buyNonConsumable(
purchaseParam: purchaseParam);
}
},
));
},
));
return Card(
child:
Column(children: <Widget>[productHeader, Divider()] + productList));
}
Card _buildConsumableBox() {
if (_loading) {
return Card(
child: (ListTile(
leading: CircularProgressIndicator(),
title: Text('Fetching consumables...'))));
}
if (!_isAvailable || _notFoundIds.contains(_kConsumableId)) {
return Card();
}
final ListTile consumableHeader =
ListTile(title: Text('Purchased consumables'));
final List<Widget> tokens = _consumables.map((String id) {
return GridTile(
child: IconButton(
icon: Icon(
Icons.stars,
size: 42.0,
color: Colors.orange,
),
splashColor: Colors.yellowAccent,
onPressed: () => consume(id),
),
);
}).toList();
return Card(
child: Column(children: <Widget>[
consumableHeader,
Divider(),
GridView.count(
crossAxisCount: 5,
children: tokens,
shrinkWrap: true,
padding: EdgeInsets.all(16.0),
)
]));
}
Future<void> consume(String id) async {
print('consume id is $id');
await ConsumableStore.consume(id);
final List<String> consumables = await ConsumableStore.load();
setState(() {
_consumables = consumables;
});
}
void showPendingUI() {
setState(() {
_purchasePending = true;
});
}
void deliverProduct(PurchaseDetails purchaseDetails) async {
print('deliverProduct'); // Last
// IMPORTANT!! Always verify a purchase purchase details before delivering the product.
if (purchaseDetails.productID == _kConsumableId) {
await ConsumableStore.save(purchaseDetails.purchaseID);
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.
print('_verifyPurchase');
return Future<bool>.value(true);
}
void _handleInvalidPurchase(PurchaseDetails purchaseDetails) {
// handle invalid purchase here if _verifyPurchase` failed.
print('_handleInvalidPurchase');
}
void _listenToPurchaseUpdated(List<PurchaseDetails> purchaseDetailsList) {
print('_listenToPurchaseUpdated');
purchaseDetailsList.forEach((PurchaseDetails purchaseDetails) async {
if (purchaseDetails.status == PurchaseStatus.pending) {
showPendingUI();
} else {
if (purchaseDetails.status == PurchaseStatus.error) {
handleError(purchaseDetails.error);
} else if (purchaseDetails.status == PurchaseStatus.purchased) {
bool valid = await _verifyPurchase(purchaseDetails);
if (valid) {
deliverProduct(purchaseDetails);
} else {
_handleInvalidPurchase(purchaseDetails);
return;
}
}
if (Platform.isAndroid) {
if (!kAutoConsume && purchaseDetails.productID == _kConsumableId) {
await InAppPurchaseConnection.instance
.consumePurchase(purchaseDetails);
}
}
if (purchaseDetails.pendingCompletePurchase) {
await InAppPurchaseConnection.instance
.completePurchase(purchaseDetails);
}
}
});
}
}
How do I solve this?

If you want to test only with non-consumable product, then you can refund the test purchase and use it again later.

Make sure your products are consumable, and also being purchased using the buyConsumable call.

Reading an image file from device storage and converting to Base64 results in an invalid base64 in Flutter

I'm trying to read file from a known path get base64 string from the image. I still don't understand why base64 is broken. This happens only in flutter code.
I did try doing the same conversion using a simple dart program i got the desired base64 string. This issue is happening in flutter.
onPressed: () async {
File imageFile =
await ImagePicker.pickImage(source: ImageSource.camera);
if (imageFile != null) {
Uint8List bytes = await imageFile.readAsBytes();
String base64data = base64.encode(bytes);
print(base64data);
}
}
Following is my console output.
W/ExifInterface(15331): Skip the tag entry since tag number is not defined: 2
W/ExifInterface(15331): Stop reading file since a wrong offset may cause an infinite loop: 0
I/chatty (15331): uid=10271(com.crowdanalytix.datax_app) Binder:15331_5 identical 2 lines
W/ExifInterface(15331): Stop reading file since a wrong offset may cause an infinite loop: 0
I/flutter (15331): 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
Base64 string which i'm getting is invalid. Can someone try this?
I'm using a OnePlus3t (ONEPLUS A3003).

print function did not print everything.
you can see full result with debug mode
code snippet
List<int> imageBytes = await _imageFile.readAsBytes();
String base64Image = base64Encode(imageBytes);
print(base64Image);
Copy base64 string from debug mode and paste to online converter, you can see result is correct.
full code from offical demo and add base64 convert
// Copyright 2019 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 'dart:convert';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:video_player/video_player.dart';
import 'dart:typed_data';
import 'package:image/image.dart' as ImageProcess;
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Image Picker Demo',
home: MyHomePage(title: 'Image Picker Example'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
File _imageFile;
dynamic _pickImageError;
bool isVideo = false;
VideoPlayerController _controller;
String _retrieveDataError;
Future<void> _playVideo(File file) async {
if (file != null && mounted) {
await _disposeVideoController();
_controller = VideoPlayerController.file(file);
await _controller.setVolume(1.0);
await _controller.initialize();
await _controller.setLooping(true);
await _controller.play();
setState(() {});
}
}
void _onImageButtonPressed(ImageSource source) async {
if (_controller != null) {
await _controller.setVolume(0.0);
}
if (isVideo) {
final File file = await ImagePicker.pickVideo(source: source);
await _playVideo(file);
} else {
try {
_imageFile = await ImagePicker.pickImage(source: source);
List<int> imageBytes = await _imageFile.readAsBytes();
String base64Image = base64Encode(imageBytes);
print(base64Image);
setState(() {});
} catch (e) {
_pickImageError = e;
}
}
}
#override
void deactivate() {
if (_controller != null) {
_controller.setVolume(0.0);
_controller.pause();
}
super.deactivate();
}
#override
void dispose() {
_disposeVideoController();
super.dispose();
}
Future<void> _disposeVideoController() async {
if (_controller != null) {
await _controller.dispose();
_controller = null;
}
}
Widget _previewVideo() {
final Text retrieveError = _getRetrieveErrorWidget();
if (retrieveError != null) {
return retrieveError;
}
if (_controller == null) {
return const Text(
'You have not yet picked a video',
textAlign: TextAlign.center,
);
}
return Padding(
padding: const EdgeInsets.all(10.0),
child: AspectRatioVideo(_controller),
);
}
Widget _previewImage() {
final Text retrieveError = _getRetrieveErrorWidget();
if (retrieveError != null) {
return retrieveError;
}
if (_imageFile != null) {
return Image.file(_imageFile);
} else if (_pickImageError != null) {
return Text(
'Pick image error: $_pickImageError',
textAlign: TextAlign.center,
);
} else {
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
}
}
Future<void> retrieveLostData() async {
final LostDataResponse response = await ImagePicker.retrieveLostData();
if (response.isEmpty) {
return;
}
if (response.file != null) {
if (response.type == RetrieveType.video) {
isVideo = true;
await _playVideo(response.file);
} else {
isVideo = false;
setState(() {
_imageFile = response.file;
});
}
} else {
_retrieveDataError = response.exception.code;
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Platform.isAndroid
? FutureBuilder<void>(
future: retrieveLostData(),
builder: (BuildContext context, AsyncSnapshot<void> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
case ConnectionState.waiting:
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
case ConnectionState.done:
return isVideo ? _previewVideo() : _previewImage();
default:
if (snapshot.hasError) {
return Text(
'Pick image/video error: ${snapshot.error}}',
textAlign: TextAlign.center,
);
} else {
return const Text(
'You have not yet picked an image.',
textAlign: TextAlign.center,
);
}
}
},
)
: (isVideo ? _previewVideo() : _previewImage()),
),
floatingActionButton: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
FloatingActionButton(
onPressed: () {
isVideo = false;
_onImageButtonPressed(ImageSource.gallery);
},
heroTag: 'image0',
tooltip: 'Pick Image from gallery',
child: const Icon(Icons.photo_library),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
onPressed: () {
isVideo = false;
_onImageButtonPressed(ImageSource.camera);
},
heroTag: 'image1',
tooltip: 'Take a Photo',
child: const Icon(Icons.camera_alt),
),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
backgroundColor: Colors.red,
onPressed: () {
isVideo = true;
_onImageButtonPressed(ImageSource.gallery);
},
heroTag: 'video0',
tooltip: 'Pick Video from gallery',
child: const Icon(Icons.video_library),
),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
backgroundColor: Colors.red,
onPressed: () {
isVideo = true;
_onImageButtonPressed(ImageSource.camera);
},
heroTag: 'video1',
tooltip: 'Take a Video',
child: const Icon(Icons.videocam),
),
),
],
),
);
}
Text _getRetrieveErrorWidget() {
if (_retrieveDataError != null) {
final Text result = Text(_retrieveDataError);
_retrieveDataError = null;
return result;
}
return null;
}
}
class AspectRatioVideo extends StatefulWidget {
AspectRatioVideo(this.controller);
final VideoPlayerController controller;
#override
AspectRatioVideoState createState() => AspectRatioVideoState();
}
class AspectRatioVideoState extends State<AspectRatioVideo> {
VideoPlayerController get controller => widget.controller;
bool initialized = false;
void _onVideoControllerUpdate() {
if (!mounted) {
return;
}
if (initialized != controller.value.initialized) {
initialized = controller.value.initialized;
setState(() {});
}
}
#override
void initState() {
super.initState();
controller.addListener(_onVideoControllerUpdate);
}
#override
void dispose() {
controller.removeListener(_onVideoControllerUpdate);
super.dispose();
}
#override
Widget build(BuildContext context) {
if (initialized) {
return Center(
child: AspectRatio(
aspectRatio: controller.value?.aspectRatio,
child: VideoPlayer(controller),
),
);
} else {
return Container();
}
}
}