Java 颤振中相机插件中的自拍相机崩溃
每当我试图从我的项目应用程序中的Java 颤振中相机插件中的自拍相机崩溃,java,android,flutter,camera,Java,Android,Flutter,Camera,每当我试图从我的项目应用程序中的camera插件打开前置摄像头时，Pixel 3XL会崩溃，但应用程序在后置摄像头上运行良好 插件版本：camera:^0.5.8+1 我的相机课 class CameraState extends State<Camera> with WidgetsBindingObserver { CameraController controller; List<CameraDescription> cameras; @override
cameracamera:^0.5.8+1class CameraState extends State<Camera> with WidgetsBindingObserver {
CameraController controller;
List<CameraDescription> cameras;
@override initState() {
super.initState();
getCameras();
}
void getCameras() async {
cameras = await availableCameras();
cameras.forEach((camera) {
if (camera.lensDirection == CameraLensDirection.front) {
onNewCameraSelected(camera);
}
});
}
/// Returns a suitable camera icon for [direction].
IconData getCameraLensIcon(CameraLensDirection direction) {
switch (direction) {
case CameraLensDirection.back:
return Icons.camera_rear;
case CameraLensDirection.front:
return Icons.camera_front;
case CameraLensDirection.external:
return Icons.camera;
}
throw ArgumentError('Unknown lens direction');
}
/// Display the preview from the camera (or a message if the preview is not available).
Widget _cameraPreviewWidget() {
if (controller == null || !controller.value.isInitialized) {
return new Center(
child: new Text(
allTranslations.text('camera_no'),
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w600,
fontFamily: fontMontserrat,
fontStyle: FontStyle.normal,
fontSize: 24.0),
),
);
} else {
final size = MediaQuery.of(context).size;
final deviceRatio = size.width / size.height;
return Transform.scale(
scale: controller.value.aspectRatio / deviceRatio,
child: Center(
child: AspectRatio(
aspectRatio: controller.value.aspectRatio,
child: CameraPreview(controller),
),
),
);
}
}
String timestamp() => DateTime.now().millisecondsSinceEpoch.toString();
void onNewCameraSelected(CameraDescription cameraDescription) async {
if (controller != null) {
await controller.dispose();
}
controller = CameraController(cameraDescription, ResolutionPreset.medium, enableAudio: false);
controller.addListener(() {
if (mounted) setState(() {});
});
try {
///
/// APP CRASHES HERE.
///
await controller.initialize();
} on CameraException catch (e) {
print(e);
}
if (mounted) {
setState(() {});
}
}
void onTakePictureButtonPressed() {
takePicture().then((String filePath) {
if (filePath != null) {
// Navigate to other screen.
}
});
}
Future<String> takePicture() async {
if (!controller.value.isInitialized) {
return null;
}
final Directory extDir = await getApplicationDocumentsDirectory();
final String dirPath = '${extDir.path}/Pictures/flutter_test';
await Directory(dirPath).create(recursive: true);
final String filePath = '$dirPath/${timestamp()}.jpg';
if (controller.value.isTakingPicture) {
// A capture is already pending, do nothing.
return null;
}
try {
await controller.takePicture(filePath);
} on CameraException catch (e) {
return null;
}
return filePath;
}
@override
Widget build(BuildContext context) {
return Stack(
children: <Widget>[
Positioned(
left: 0, top: 0, right: 0, bottom: 0,
child: _cameraPreviewWidget(),
),
Scaffold(
body: new Container(
color: Colors.transparent,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new Text(allTranslations.text('licensescan_back'),
textAlign: TextAlign.center,
style: const TextStyle(
color: Colors.white,
fontWeight: FontWeight.w400,
fontFamily: fontSourceSansPro,
fontStyle: FontStyle.normal,
fontSize: 18.0
)
),
Container(height: 10),
Padding(
padding: new EdgeInsets.only(left: 40, right: 40),
child: new Text(allTranslations.text('licensescan_positionback'),
textAlign: TextAlign.center,
style: const TextStyle(
color: Colors.white,
fontWeight: FontWeight.w400,
fontFamily: fontSourceSansPro,
fontStyle: FontStyle.normal,
fontSize: 13.0
)
),
),
Expanded(child: new Container()),
new FlatButton(
onPressed: onTakePictureButtonPressed,
child: new Container(
width: 54, height: 54,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(27),
border: Border.all(
color: Colors.white
),
color: Colors.transparent
),
child: Center(
child: new Container(
width: 45, height: 45,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(22.5),
color: Colors.white
),
),
),
)
),
new Container(height: 58)
],
),
),
)
],
);
}
}
08-31 10:24:07.816 E/AndroidRuntime(23702): FATAL EXCEPTION: main
08-31 10:24:07.816 E/AndroidRuntime(23702): Process: com.craypay.app, PID: 23702
08-31 10:24:07.816 E/AndroidRuntime(23702): java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Surface android.media.ImageReader.getSurface()' on a null object reference
08-31 10:24:07.816 E/AndroidRuntime(23702): at f.b.c.b.g.d(Unknown Source:5)
08-31 10:24:07.816 E/AndroidRuntime(23702): at f.b.c.b.g$b.onOpened(Unknown Source:7)
08-31 10:24:07.816 E/AndroidRuntime(23702): at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:143)
08-31 10:24:07.816 E/AndroidRuntime(23702): at android.os.Handler.handleCallback(Handler.java:873)
08-31 10:24:07.816 E/AndroidRuntime(23702): at android.os.Handler.dispatchMessage(Handler.java:99)
08-31 10:24:07.816 E/AndroidRuntime(23702): at android.os.Looper.loop(Looper.java:193)
08-31 10:24:07.816 E/AndroidRuntime(23702): at android.app.ActivityThread.main(ActivityThread.java:6680)
08-31 10:24:07.816 E/AndroidRuntime(23702): at java.lang.reflect.Method.invoke(Native Method)
08-31 10:24:07.816 E/AndroidRuntime(23702): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
08-31 10:24:07.816 E/AndroidRuntime(23702): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
我也尝试了几乎所有的解决方案，但没有成功。我的相机拍照功能崩溃了 “java.lang.NullPointerException:尝试调用虚拟方法'int io.flatter.embedding.engine.SystemChannel.PlatformChannel$DeviceOrientation.ordinal（）' 在空对象引用E/AndroidRuntime（18591）上：在 io.flatter.plugins.camera.DeviceOrientationManager.getMediaOrientation（DeviceOrientationManager.java:58）” 对我来说，帮助添加 初始化（）后等待controller.lockCaptureOrientation（）。 试试这个，也许对你有帮助
try {
///
/// APP CRASHES HERE.
///
await controller.initialize();
await controller.lockCaptureOrientation();
}
我的相机拍照功能崩溃了 “java.lang.NullPointerException:尝试调用虚拟方法'int io.flatter.embedding.engine.SystemChannel.PlatformChannel$DeviceOrientation.ordinal（）' 在空对象引用E/AndroidRuntime（18591）上：在 io.flatter.plugins.camera.DeviceOrientationManager.getMediaOrientation（DeviceOrientationManager.java:58）” 对我来说，帮助添加 初始化（）后等待controller.lockCaptureOrientation（）。 试试这个，也许对你有帮助
try {
///
/// APP CRASHES HERE.
///
await controller.initialize();
await controller.lockCaptureOrientation();
}
解决方案：使用不同版本的库。正如github问题所表明的那样，它只是被破坏了，对此我们无能为力。解决方案：使用不同版本的库。正如github问题所表明的那样，它只是被破坏了，对此我们无能为力。