image_picker pickVideo(source: ImageSource.camera) always return null #114067
Description
Steps to Reproduce
- I download code from https://github.com/flutter/plugins
- open project at https://github.com/flutter/plugins/tree/main/packages/image_picker/image_picker/example
- debug main.dart
- record video
Expected results: play the recorded video
Actual results: nothing happen due to line 89 always return null
Code sample
// 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.
// ignore_for_file: public_member_api_docs
import 'dart:async';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:video_player/video_player.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: 'Image Picker Demo',
home: MyHomePage(title: 'Image Picker Example'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, this.title}) : super(key: key);
final String? title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<XFile>? _imageFileList;
void _setImageFileListFromFile(XFile? value) {
_imageFileList = value == null ? null : <XFile>[value];
}
dynamic _pickImageError;
bool isVideo = false;
VideoPlayerController? _controller;
VideoPlayerController? _toBeDisposed;
String? _retrieveDataError;
final ImagePicker _picker = ImagePicker();
final TextEditingController maxWidthController = TextEditingController();
final TextEditingController maxHeightController = TextEditingController();
final TextEditingController qualityController = TextEditingController();
Future<void> _playVideo(XFile? file) async {
if (file != null && mounted) {
await _disposeVideoController();
late VideoPlayerController controller;
if (kIsWeb) {
controller = VideoPlayerController.network(file.path);
} else {
controller = VideoPlayerController.file(File(file.path));
}
_controller = controller;
// In web, most browsers won't honor a programmatic call to .play
// if the video has a sound track (and is not muted).
// Mute the video so it auto-plays in web!
// This is not needed if the call to .play is the result of user
// interaction (clicking on a "play" button, for example).
const double volume = kIsWeb ? 0.0 : 1.0;
await controller.setVolume(volume);
await controller.initialize();
await controller.setLooping(true);
await controller.play();
setState(() {});
}
}
Future<void> _onImageButtonPressed(ImageSource source,
{BuildContext? context, bool isMultiImage = false}) async {
if (_controller != null) {
await _controller!.setVolume(0.0);
}
if (isVideo) {
final XFile? file = await _picker.pickVideo(
source: source, maxDuration: const Duration(seconds: 10));
await _playVideo(file);
} else if (isMultiImage) {
await _displayPickImageDialog(context!,
(double? maxWidth, double? maxHeight, int? quality) async {
try {
final List<XFile> pickedFileList = await _picker.pickMultiImage(
maxWidth: maxWidth,
maxHeight: maxHeight,
imageQuality: quality,
);
setState(() {
_imageFileList = pickedFileList;
});
} catch (e) {
setState(() {
_pickImageError = e;
});
}
});
} else {
await _displayPickImageDialog(context!,
(double? maxWidth, double? maxHeight, int? quality) async {
try {
final XFile? pickedFile = await _picker.pickImage(
source: source,
maxWidth: maxWidth,
maxHeight: maxHeight,
imageQuality: quality,
);
setState(() {
_setImageFileListFromFile(pickedFile);
});
} catch (e) {
setState(() {
_pickImageError = e;
});
}
});
}
}
@override
void deactivate() {
if (_controller != null) {
_controller!.setVolume(0.0);
_controller!.pause();
}
super.deactivate();
}
@override
void dispose() {
_disposeVideoController();
maxWidthController.dispose();
maxHeightController.dispose();
qualityController.dispose();
super.dispose();
}
Future<void> _disposeVideoController() async {
if (_toBeDisposed != null) {
await _toBeDisposed!.dispose();
}
_toBeDisposed = _controller;
_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 _previewImages() {
final Text? retrieveError = _getRetrieveErrorWidget();
if (retrieveError != null) {
return retrieveError;
}
if (_imageFileList != null) {
return Semantics(
label: 'image_picker_example_picked_images',
child: ListView.builder(
key: UniqueKey(),
itemBuilder: (BuildContext context, int index) {
// Why network for web?
// See https://pub.dev/packages/image_picker#getting-ready-for-the-web-platform
return Semantics(
label: 'image_picker_example_picked_image',
child: kIsWeb
? Image.network(_imageFileList![index].path)
: Image.file(File(_imageFileList![index].path)),
);
},
itemCount: _imageFileList!.length,
),
);
} 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,
);
}
}
Widget _handlePreview() {
if (isVideo) {
return _previewVideo();
} else {
return _previewImages();
}
}
Future<void> retrieveLostData() async {
final LostDataResponse response = await _picker.retrieveLostData();
if (response.isEmpty) {
return;
}
if (response.file != null) {
if (response.type == RetrieveType.video) {
isVideo = true;
await _playVideo(response.file);
} else {
isVideo = false;
setState(() {
if (response.files == null) {
_setImageFileListFromFile(response.file);
} else {
_imageFileList = response.files;
}
});
}
} else {
_retrieveDataError = response.exception!.code;
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title!),
),
body: Center(
child: !kIsWeb && defaultTargetPlatform == TargetPlatform.android
? 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 _handlePreview();
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,
);
}
}
},
)
: _handlePreview(),
),
floatingActionButton: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Semantics(
label: 'image_picker_example_from_gallery',
child: FloatingActionButton(
onPressed: () {
isVideo = false;
_onImageButtonPressed(ImageSource.gallery, context: context);
},
heroTag: 'image0',
tooltip: 'Pick Image from gallery',
child: const Icon(Icons.photo),
),
),
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: FloatingActionButton(
onPressed: () {
isVideo = false;
_onImageButtonPressed(
ImageSource.gallery,
context: context,
isMultiImage: true,
);
},
heroTag: 'image1',
tooltip: 'Pick Multiple 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, context: context);
},
heroTag: 'image2',
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;
}
Future<void> _displayPickImageDialog(
BuildContext context, OnPickImageCallback onPick) async {
return showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: const Text('Add optional parameters'),
content: Column(
children: <Widget>[
TextField(
controller: maxWidthController,
keyboardType:
const TextInputType.numberWithOptions(decimal: true),
decoration: const InputDecoration(
hintText: 'Enter maxWidth if desired'),
),
TextField(
controller: maxHeightController,
keyboardType:
const TextInputType.numberWithOptions(decimal: true),
decoration: const InputDecoration(
hintText: 'Enter maxHeight if desired'),
),
TextField(
controller: qualityController,
keyboardType: TextInputType.number,
decoration: const InputDecoration(
hintText: 'Enter quality if desired'),
),
],
),
actions: <Widget>[
TextButton(
child: const Text('CANCEL'),
onPressed: () {
Navigator.of(context).pop();
},
),
TextButton(
child: const Text('PICK'),
onPressed: () {
final double? width = maxWidthController.text.isNotEmpty
? double.parse(maxWidthController.text)
: null;
final double? height = maxHeightController.text.isNotEmpty
? double.parse(maxHeightController.text)
: null;
final int? quality = qualityController.text.isNotEmpty
? int.parse(qualityController.text)
: null;
onPick(width, height, quality);
Navigator.of(context).pop();
}),
],
);
});
}
}
typedef OnPickImageCallback = void Function(
double? maxWidth, double? maxHeight, int? quality);
class AspectRatioVideo extends StatefulWidget {
const AspectRatioVideo(this.controller, {Key? key}) : super(key: key);
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.isInitialized) {
initialized = controller!.value.isInitialized;
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();
}
}
}
Logs
[ ] 💪 Running with sound null safety 💪
[ ] An Observatory debugger and profiler on sdk gphone64 arm64 is available at: http://127.0.0.1:59432/LWeUh03_dP4=/
[ +115 ms] The Flutter DevTools debugger and profiler on sdk gphone64 arm64 is available at: http://127.0.0.1:9100?uri=http://127.0.0.1:59432/LWeUh03_dP4=/
[ +44 ms] E/SurfaceSyncer( 6742): Failed to find sync for id=0
[ +19 ms] W/Parcel ( 6742): Expecting binder but got null!
[+8456 ms] D/EGL_emulation( 6742): app_time_stats: avg=4239.88ms min=109.92ms max=8369.84ms count=2
[ +8 ms] E/flutter ( 6742): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(already_active, Image picker is already active,
null, null)
[ ] E/flutter ( 6742): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:653:7)
[ ] E/flutter ( 6742): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:296:18)
[ ] E/flutter ( 6742): <asynchronous suspension>
[ ] E/flutter ( 6742): #2 ImagePickerAndroid.getVideo (package:image_picker_android/image_picker_android.dart:211:26)
[ ] E/flutter ( 6742): <asynchronous suspension>
[ ] E/flutter ( 6742): #3 _MyHomePageState._onImageButtonPressed (package:image_picker_example/main.dart:89:27)
[ ] E/flutter ( 6742): <asynchronous suspension>
[ ] E/flutter ( 6742):
[+8407 ms] D/CompatibilityChangeReporter( 6742): Compat change id reported: 78294732; UID 10157; state: DISABLED
[ +32 ms] E/SurfaceSyncer( 6742): Failed to find sync for id=0
[ ] E/SurfaceSyncer( 6742): Failed to find sync for id=1
[ +32 ms] E/SurfaceSyncer( 6742): Failed to find sync for id=0
[ ] E/SurfaceSyncer( 6742): Failed to find sync for id=1
flutter analyze
Analyzing example...
No issues found! (ran in 1.5s)
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