[это снимок экрана somr 
Я пытаюсь написать приложение для флаттера, чтобы проверить переднюю и заднюю камеру при первом открытии задней камеры пользователем, будет отображаться вопрос, если изображение ясно после того, как он сделает снимок, после того, как его спросят, если фотография четкая, я поменяю камеру, но когда я делаю это, приложение разбилось, я попытался вызвать только один класс, который работает с двумя, я меняю ранк но та же проблема, что два предложения одинаковы, единственное отличие состоит в том, что один с передней камерой, а другой с задней, этот код предназначен для задней камеры, он корректно работает import 'dart: asyn c'; import 'dart: io';
import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:mbd/camera/camT.dart';
import 'package:mbd/camera/cmaerabackT.dart';
import 'package:mbd/welcome_ecran.dart';
import 'package:path/path.dart' show join;
import 'package:path_provider/path_provider.dart';
class back extends StatefulWidget {
final CameraDescription camera;
const back({
Key key,
@required this.camera,
}) : super(key: key);
@override
_backState createState() => _backState();
}
class _backState extends State<back> {
bool _cameraOn = true;
Future<void> hello() async {
// WidgetsFlutterBinding.ensureInitialized();
final cameras = await availableCameras();
final b = 0;
final firstCamera = cameras[0];
final secondCamera = cameras[0];
runApp(MaterialApp(
theme: ThemeData.dark(),
home: back(
camera: firstCamera,
)));
}
int a = 5;
CameraController _controller;
Future<void> _initializeControllerFuture;
@override
void initState() {
super.initState();
_cameraOn=true;
hello();
SystemChrome.setEnabledSystemUIOverlays([]);
_controller = CameraController(
widget.camera,
ResolutionPreset.ultraHigh,
);
_initializeControllerFuture = _controller.initialize();
}
@override
void dispose() {
super.dispose();
// Dispose of the controller when the widget is disposed.
_controller.dispose();
_cameraOn;
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child: Column(children: <Widget>[
Container(
child: FutureBuilder<void>(
future: _initializeControllerFuture,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
// If the Future is complete, display the preview.
return CameraPreview(_controller);
} else {
// Otherwise, display a loading indicator.
return Center(child: CircularProgressIndicator());
}
},
),
height: MediaQuery
.of(context)
.size
.height * 0.75,
),
Container(height: 10),
if (a == 5)
Text(
'La vue dans le viseur est-elle degage',
style: TextStyle(fontSize: 20),
),
if (a == 0) Text('essayer de prendre une photo'),
Container(
height: 25,
),
if (a == 0)
FloatingActionButton(
child: Icon(Icons.camera_alt),
// Provide an onPressed callback.
onPressed: () async {
_cameraOn=false;
// Take the Picture in a try / catch block. If anything goes wrong,
// catch the error.
try {
// Ensure that the camera is initialized.
await _initializeControllerFuture;
// Construct the path where the image should be saved using the
// pattern package.
final path = join(
// Store the picture in the temp directory.
// Find the temp directory using the `path_provider` plugin.
(await getTemporaryDirectory()).path,
'${DateTime.now()}.png',
);
// Attempt to take a picture and log where it's been saved.
await _controller.takePicture(path);
// If the picture was taken, display it on a new screen.
Navigator.push(
context,
MaterialPageRoute(
builder:( (context) => Display(imagePath: path)),
),
);
} catch (e) {
// If an error occurs, log the error to the console.
print(e);
}
},
),
if (a == 5)
Row(
children: <Widget>[
Container(
width: MediaQuery
.of(context)
.size
.width * 0.05,
),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'NON',
style: TextStyle(fontSize: 20),
),
onTap: null,
)),
Container(width: MediaQuery
.of(context)
.size
.width * 0.5),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'Oui',
style: TextStyle(fontSize: 20),
),
onTap: () {
a = 0;
setState(() {
a = 0;
});
print('bonjoue$a');
},
)),
],
),
])),
);
}
}
class Display extends StatelessWidget {
final String imagePath;
const Display({Key key, this.imagePath}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Display the Picture')),
body: Container(
child: Column(children: <Widget>[
Container(
height: MediaQuery.of(context).size.height * 0.7,
child: Image.file(File(imagePath))),
Container(
height: 10,
),
Text('La photo est-elle claire pas de pixels diffextuex truve'),
Row(
children: <Widget>[
Container(
width: MediaQuery.of(context).size.width * 0.05,
),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'NON',
style: TextStyle(fontSize: 20),
),
onTap: null,
)),
Container(width: MediaQuery.of(context).size.width * 0.5),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'Oui',
style: TextStyle(fontSize: 20),
),
onTap: () {Navigator.push(
context,
MaterialPageRoute(builder: (context) =>Camera()),
);},
)),
],
),
])));
}
}
a
и это код передней камеры
import 'dart:async';
import 'dart:io';
import 'package:camera/camera.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:mbd/camera/cmaerabackT.dart';
import 'package:path/path.dart' show join;
import 'package:path_provider/path_provider.dart';
Future<void> hello() async {
// WidgetsFlutterBinding.ensureInitialized();
final cameras = await availableCameras();
final b = 0;
final sousou= cameras[1];
runApp(MaterialApp(
theme: ThemeData.dark(),
home: Camera(
camera: sousou,
)));
}
// A screen that allows users to take a picture using a given camera.
class Camera extends StatefulWidget {
final CameraDescription camera;
const Camera({
Key key,
@required this.camera,
}) : super(key: key);
@override
TakePictureScreenState createState() => TakePictureScreenState();
}
class TakePictureScreenState extends State<Camera> {
int a = 5;
CameraController _controller;
Future<void> _initializeControllerFuture;
@override
void initState() {
super.initState();
print('bonjour');
hello();
SystemChrome.setEnabledSystemUIOverlays([]);
_controller = CameraController(
widget.camera,
ResolutionPreset.high,
);
_initializeControllerFuture = _controller.initialize();
}
@override
void dispose() {
// Dispose of the controller when the widget is disposed.
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child: Column(children: <Widget>[
Container(
child: FutureBuilder<void>(
future: _initializeControllerFuture,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
// If the Future is complete, display the preview.
return CameraPreview(_controller);
} else {
// Otherwise, display a loading indicator.
return Center(child: CircularProgressIndicator());
}
},
),
height: MediaQuery.of(context).size.height * 0.75,
),
Container(height: 10),
if (a == 5)
Text(
'La vue dans le viseur est-elle degage',
style: TextStyle(fontSize: 20),
),
if (a == 0) Text('essayer de prendre une photo'),
Container(
height: 25,
),
if (a == 0)
FloatingActionButton(
child: Icon(Icons.camera_alt),
// Provide an onPressed callback.
onPressed: () async {
// Take the Picture in a try / catch block. If anything goes wrong,
// catch the error.
try {
// Ensure that the camera is initialized.
await _initializeControllerFuture;
// Construct the path where the image should be saved using the
// pattern package.
final path = join(
// Store the picture in the temp directory.
// Find the temp directory using the `path_provider` plugin.
(await getTemporaryDirectory()).path,
'${DateTime.now()}.png',
);
// Attempt to take a picture and log where it's been saved.
await _controller.takePicture(path);
// If the picture was taken, display it on a new screen.
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DisplayPictureScreen(imagePath: path),
),
);
} catch (e) {
// If an error occurs, log the error to the console.
print(e);
}
},
),
if (a == 5)
Row(
children: <Widget>[
Container(
width: MediaQuery.of(context).size.width * 0.05,
),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'NON',
style: TextStyle(fontSize: 20),
),
onTap: null,
)),
Container(width: MediaQuery.of(context).size.width * 0.5),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'Oui',
style: TextStyle(fontSize: 20),
),
onTap: () {
a = 0;
setState(() {
a = 0;
});
print('bonjoue$a');
},
)),
],
),
])),
);
}
}
// A widget that displays the picture taken by the user.
class DisplayPictureScreen extends StatelessWidget {
final String imagePath;
const DisplayPictureScreen({Key key, this.imagePath}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Display the Picture')),
body: Container(
child: Column(children: <Widget>[
Container(
height: MediaQuery.of(context).size.height * 0.7,
child: Image.file(File(imagePath))),
Container(
height: 10,
),
Text('La photo est-elle claire pas de pixels diffextuex truve'),
Row(
children: <Widget>[
Container(
width: MediaQuery.of(context).size.width * 0.05,
),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'NON',
style: TextStyle(fontSize: 20),
),
onTap: null,
)),
Container(width: MediaQuery.of(context).size.width * 0.5),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.lightBlueAccent,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: InkWell(
child: Text(
'Oui',
style: TextStyle(fontSize: 20),
),
onTap: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) =>back()),
);},
)),
],
),
])));
}
}
, и это ошибка, которую я обнаружил и благодаря которой повторение запроса на захват отменено.
E/BufferQueueProducer( 8606): [SurfaceTexture-1-8606-5] cancelBuffer: BufferQueue has been abandoned
I/chatty ( 8606): uid=10176(com.example.phonizy2) Binder:8606_4 identical 11 lines
E/BufferQueueProducer( 8606): [SurfaceTexture-1-8606-5] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer( 8606): [SurfaceTexture-1-8606-5] connect: BufferQueue has been abandoned
E/BufferQueueProducer( 8606): [SurfaceTexture-1-8606-5] setMaxDequeuedBufferCount: BufferQueue has been abandoned
V/SensorManager( 8606): RegisterListener LIS3DH Accelerometer type:1 delay:200000us by android.view.OrientationEventListener$SensorEventListenerImpl
E/Parcel ( 8606): Reading a NULL string not supported here.
E/libc ( 8606): Access denied finding property "persist.camera.privapp.list"
I/CameraManager( 8606): Using legacy camera HAL.
D/Camera ( 8606): mHypnusCtrl is true
E/libc ( 8606): Access denied finding property "camera.hal1.packagelist"
E/CheckPermission( 8606): camera-code= 5
V/SensorManager( 8606): unRegisterListener by android.view.OrientationEventListener$SensorEventListenerImpl
E/Parcel ( 8606): Reading a NULL string not supported here.
D/AndroidRuntime( 8606): Shutting down VM
E/AndroidRuntime( 8606): FATAL EXCEPTION: main
E/AndroidRuntime( 8606): Process: com.example.phonizy2, PID: 8606
E/AndroidRuntime( 8606): java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Surface android.media.ImageReader.getSurface()' on a null object reference
E/AndroidRuntime( 8606): at io.flutter.plugins.camera.Camera.startPreview(Camera.java:424)
E/AndroidRuntime( 8606): at io.flutter.plugins.camera.Camera$2.onOpened(Camera.java:160)
E/AndroidRuntime( 8606): at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:143)
E/AndroidRuntime( 8606): at android.os.Handler.handleCallback(Handler.java:790)
E/AndroidRuntime( 8606): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 8606): at android.os.Looper.loop(Looper.java:198)
E/AndroidRuntime( 8606): at android.app.ActivityThread.main(ActivityThread.java:7055)
E/AndroidRuntime( 8606): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 8606): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:523)
E/AndroidRuntime( 8606): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:836)
I/Process ( 8606): Sending signal. PID: 8606 SIG: 9