[英]How to dismiss any open dialog in Flutter app, when app goes to background
[英]Flutter CamerPlugin “camera preview” freezed when app goes to background
嗨,我使用 flutter cameraPreview 拍攝照片,相機預覽工作正常,但是當相機屏幕進入背景時,在該屏幕上恢復時相機屏幕凍結,無法查看 cameraPrview onResume。
我的代碼:
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 配置正確。
我想知道為什么暫停時會處理相機預覽。
問題已通過初始化的 cameraPreview onResume 解決
@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"
}
}
恢復到頁面時,_controller.initialize 將調用,以便 cameraPreview 可以正常工作。
這是由於cameraPreview在onPause上運行了很長時間,它會被釋放..onAndroid我想是這樣..
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