我有一个应用程序,我有一个Scaffold
和一个AppBar
和底部广告横幅。
在中间,有来自相机插件的CameraPreview
在颤振。
由于CameraPreview
是用来获取设备/摄像机的高宽比的,所以CameraPreview
并不占用整个可用空间,给大多数设备留下了额外的空间。
我试图对CameraPreview
进行裁剪,以便只显示适合于可用空间的任何内容。它成功了,但是现在预览已经扩展了。
LayoutBuilder(
builder: (context, constraints) {
final cameraController = controller.cameraController!;
if(cameraController.value.previewSize != null) {
return ClipRect(
child: OverflowBox(
alignment: Alignment.center,
child: FittedBox(
fit: BoxFit.fitWidth,
child: SizedBox(
width: constraints.maxWidth,
height: constraints.maxWidth,
child: AspectRatio(
aspectRatio: cameraController.value.aspectRatio,
child: CameraPreview(cameraController),
),
),
),
),
);
} else {
return const SizedBox.shrink();
}
},
)
我尝试了其他解决方案,如Transform.scale
,但这只是放大预览,它不会改变比率或拉伸。
在包中寻找解决方案本身也无济于事,大多数类似的问题都在拖延,或者已经因为拖延而关闭了。
我在这里该怎么做?我应该手动剪辑预览值吗?
发布于 2021-12-21 17:50:56
检查下面的代码,
使用MediaQuery获取屏幕大小&计算高宽比小部件的比例,并向其添加CameraPreview(),如下所示
// get screen size
final size = MediaQuery.of(context).size;
// calculate scale for aspect ratio widget
var scale = cameraController.value.aspectRatio / size.aspectRatio;
// check if adjustments are needed...
if (cameraController.value.aspectRatio < size.aspectRatio) {
scale = 1 / scale;
}
return Transform.scale(
scale: scale,
child: Center(
child: AspectRatio(
aspectRatio: cameraController.value.aspectRatio,
child: CameraPreview(cameraController),
),
),
);
完整代码
@override
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: () {
if (controller != null && controller.value.isRecordingVideo) {
//stop video
}
},
child: Scaffold(
resizeToAvoidBottomInset: false,
key: _scaffoldKey,
body: Container(
child: Stack(
children: [
Positioned(
child: Container(
alignment: Alignment.center,
child: cameraScreen(),
),
),
Positioned(
child: Container(
alignment: Alignment.bottomCenter,
child: Container(
height: MediaQuery.of(context).size.height * .1,
color: Colors.black54,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
//can add Controls
],
),
),
),
)
],
),
),
),
);
}
Widget cameraScreen() {
final CameraController cameraController = controller;
if (cameraController == null || !cameraController.value.isInitialized) {
return Container(
width: MediaQuery.of(context).size.width,
height: MediaQuery.of(context).size.height,
color: Colors.black,
child: Center(
child: Text(
"Loading Camera...",
style: CameraTextStyle.cameraUtilLoadingStyle(),
),
),
);
} else {
return cameraWidget(context, cameraController);
}
}
Widget cameraWidget(context, cameraController) {
// get screen size
final size = MediaQuery.of(context).size;
// calculate scale for aspect ratio widget
var scale = cameraController.value.aspectRatio / size.aspectRatio;
// check if adjustments are needed...
if (cameraController.value.aspectRatio < size.aspectRatio) {
scale = 1 / scale;
}
return Transform.scale(
scale: scale,
child: Center(
child: AspectRatio(
aspectRatio: cameraController.value.aspectRatio,
child: CameraPreview(cameraController),
),
),
);
}
Widget cameraSwitch() {
final CameraController cameraController = controller;
return Container(
child: InkWell(
onTap: () {
if (cameraController != null &&
cameraController.value.isInitialized &&
!cameraController.value.isRecordingVideo) {
if (cameras.isNotEmpty) {
if (selectedCamera == cameras[0]) {
selectedCamera = cameras[1];
onNewCameraSelected(selectedCamera);
} else {
selectedCamera = cameras[0];
onNewCameraSelected(selectedCamera);
}
}
}
setState(() {});
},
child: Icon(
Icons.switch_camera,
size: 30,
color: Colors.white,
),
),
);
}
https://stackoverflow.com/questions/70414255
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