您好,我使用flutter cameraPreview捕获照片时,相机预览可以正常工作,但是当相机屏幕进入背景时,在该屏幕上恢复播放时,相机屏幕会变得模糊,无法在恢复状态下查看cameraPrview。
mycode:
Future<void> _initializeCamera() async {
final cameras = await availableCameras();
final firstCamera = cameras.first;
_controller = CameraController(firstCamera, ResolutionPreset.high);
_initializeControllerFuture = _controller.initialize();
if (!mounted) {
return;
}
setState(() {
isCameraReady = true;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
body: Stack(children: <Widget>[
FutureBuilder<void>(
future: _initializeControllerFuture,
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
// If the Future is complete, display the preview.
return CameraPreview(_controller);
} else {
return Center(
child:
CircularProgressIndicator()); // Otherwise, display a loading indicator.
}
},
),],),);
Controller 配置合理。
我想知道为什么暂停时会丢弃相机预览。
最佳答案
通过初始化相机解决了问题
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
if (state == AppLifecycleState.resumed) {
_controller != null
? _initializeControllerFuture = _controller.initialize()
: null; //on pause camera disposed so we need call again "issue is only for android"
}
}
在恢复到页面时,将调用_controller.initialize,以便cameraPreview正常运行。
这是由于cameraPreview在onPause上运行了很长时间,它将被废弃。