我正在使用 Riverpod 提供程序类来处理从图库中挑选图像。但是，一旦选择了图像，我就会收到错误：PlatformException(multiple_request, Canceled by a second request null, null)。不确定第二个请求来自哪里。更重要的是，由于这种未知的取消，没有图像应用于我的占位符 (CircleAvartar)。这是有问题的两个飞镖文件，感谢您的帮助。
图像提供者文件：
final myImageProvider =
ChangeNotifierProvider<ImageNotifier>((ref) => ImageNotifier());
class ImageNotifier extends ChangeNotifier {
ImageNotifier() : super();
final file = useState<File?>(null);
final imageFile = useState<XFile?>(null);
final imagePicker = ImagePicker();
Future<void> _pickImage(int type) async {
try {
XFile? userImage = await imagePicker.pickImage(
source: type == 1 ? ImageSource.gallery : ImageSource.camera,
imageQuality: 50,
);
imageFile.value = userImage;
// imageFile.value = XFile(userImage!.path);
} catch (e) {
print(e);
}
notifyListeners();
}
void showPicker(context) {
showModalBottomSheet(
backgroundColor: Theme.of(context).primaryColor,
context: context,
builder: (BuildContext bc) {
return SafeArea(
child: Wrap(
children: [
ListTile(
leading: const Icon(
Icons.photo_library,
color: Colors.white,
),
title: const Text(
'Photo Gallery',
style: TextStyle(fontSize: 22),
),
onTap: () => _pickImage(1),
),
ListTile(
leading: const Icon(
Icons.photo_camera,
color: Colors.white,
),
title: const Text(
'Camera',
style: TextStyle(fontSize: 22),
),
onTap: () => _pickImage(2),
),
ListTile(
leading: const Icon(
Icons.close,
color: Colors.white,
),
title: const Text(
'Cancel',
style: TextStyle(fontSize: 22),
),
onTap: () {
imageFile.value = null;
Navigator.of(context).pop();
},
),
],
),
);
},
);
notifyListeners();
}
AuthScreen 飞镖文件：
Widget build(BuildContext context, WidgetRef ref) {
final _passwordController = useTextEditingController();
final _passwordFocusScope = useFocusNode();
final _emailFocusScope = useFocusNode();
final _phoneFocusScope = useFocusNode();
final _confirmFocusScope = useFocusNode();
final _isVisible = useState<bool>(true);
var _authMode = useState<AuthMode>(AuthMode.login);
final imageProviderState = ref.watch(myImageProvider.notifier);
final deviceSize = MediaQuery.of(context).size;
final authMode = ModalRoute.of(context)?.settings.arguments as String;
switch (authMode) {
case 'login':
_authMode.value = AuthMode.login;
break;
case 'register':
_authMode.value = AuthMode.register;
break;
case 'google':
_authMode.value = AuthMode.google;
break;
case 'guest':
_authMode.value = AuthMode.guest;
break;
}
return Scaffold(
body: Stack(
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Form(
key: _formKey,
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: [
const SizedBox(
height: 80,
),
Center(
child: _authMode.value == AuthMode.login
? const Text(
'Access Your Account',
style: TextStyle(
fontSize: 25,
),
)
: Row(
children: [
InkWell(
onTap: () =>
imageProviderState.showPicker(context),
// () => ref
// .read(myImageProvider.notifier)
// .showPicker(context),
child: CircleAvatar(
radius: 50,
backgroundImage:
imageProviderState.imageFile.value !=
null
? FileImage(
// File(ref
// .read(imageProvider.notifier)
// .imageFile
// .value!
// .path),
// )
File(imageProviderState
.imageFile.value!.path),
)
: null,
child: imageProviderState.imageFile.value ==
null
? const Icon(
Icons.camera,
// Icons.add_photo_alternate,
size: 30,
color: Colors.white,
)
: null,
),
),
