flutter_package / mobile_scanner

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Navaron Bracke
718ee59e 1 parent 2ddac10f

handle errors from controller.start() in example app

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Showing 3 changed files with 78 additions and 14 deletions
@@ -26,6 +26,31 @@ class _BarcodeListScannerWithControllerState @@ -26,6 +26,31 @@ class _BarcodeListScannerWithControllerState
26 26
27 bool isStarted = true; 27 bool isStarted = true;
28 28
  29 + void _startOrStop() {
  30 + if (isStarted) {
  31 + controller.stop();
  32 + } else {
  33 + controller.start().catchError((error) {
  34 + final exception = error as MobileScannerException;
  35 +
  36 + switch (exception.errorCode) {
  37 + case MobileScannerErrorCode.controllerUninitialized:
  38 + break; // This error code is not used by `start()`.
  39 + case MobileScannerErrorCode.genericError:
  40 + debugPrint('Scanner failed to start');
  41 + break;
  42 + case MobileScannerErrorCode.permissionDenied:
  43 + debugPrint('Camera permission denied');
  44 + break;
  45 + }
  46 + });
  47 + }
  48 +
  49 + setState(() {
  50 + isStarted = !isStarted;
  51 + });
  52 + }
  53 +
29 @override 54 @override
30 Widget build(BuildContext context) { 55 Widget build(BuildContext context) {
31 return Scaffold( 56 return Scaffold(
@@ -93,10 +118,7 @@ class _BarcodeListScannerWithControllerState @@ -93,10 +118,7 @@ class _BarcodeListScannerWithControllerState
93 ? const Icon(Icons.stop) 118 ? const Icon(Icons.stop)
94 : const Icon(Icons.play_arrow), 119 : const Icon(Icons.play_arrow),
95 iconSize: 32.0, 120 iconSize: 32.0,
96 - onPressed: () => setState(() {  
97 - isStarted ? controller.stop() : controller.start();  
98 - isStarted = !isStarted;  
99 - }), 121 + onPressed: _startOrStop,
100 ), 122 ),
101 Center( 123 Center(
102 child: SizedBox( 124 child: SizedBox(
@@ -26,6 +26,31 @@ class _BarcodeScannerWithControllerState @@ -26,6 +26,31 @@ class _BarcodeScannerWithControllerState
26 26
27 bool isStarted = true; 27 bool isStarted = true;
28 28
  29 + void _startOrStop() {
  30 + if (isStarted) {
  31 + controller.stop();
  32 + } else {
  33 + controller.start().catchError((error) {
  34 + final exception = error as MobileScannerException;
  35 +
  36 + switch (exception.errorCode) {
  37 + case MobileScannerErrorCode.controllerUninitialized:
  38 + break; // This error code is not used by `start()`.
  39 + case MobileScannerErrorCode.genericError:
  40 + debugPrint('Scanner failed to start');
  41 + break;
  42 + case MobileScannerErrorCode.permissionDenied:
  43 + debugPrint('Camera permission denied');
  44 + break;
  45 + }
  46 + });
  47 + }
  48 +
  49 + setState(() {
  50 + isStarted = !isStarted;
  51 + });
  52 + }
  53 +
29 @override 54 @override
30 Widget build(BuildContext context) { 55 Widget build(BuildContext context) {
31 return Scaffold( 56 return Scaffold(
@@ -90,10 +115,7 @@ class _BarcodeScannerWithControllerState @@ -90,10 +115,7 @@ class _BarcodeScannerWithControllerState
90 ? const Icon(Icons.stop) 115 ? const Icon(Icons.stop)
91 : const Icon(Icons.play_arrow), 116 : const Icon(Icons.play_arrow),
92 iconSize: 32.0, 117 iconSize: 32.0,
93 - onPressed: () => setState(() {  
94 - isStarted ? controller.stop() : controller.start();  
95 - isStarted = !isStarted;  
96 - }), 118 + onPressed: _startOrStop,
97 ), 119 ),
98 Center( 120 Center(
99 child: SizedBox( 121 child: SizedBox(
@@ -28,6 +28,31 @@ class _BarcodeScannerReturningImageState @@ -28,6 +28,31 @@ class _BarcodeScannerReturningImageState
28 28
29 bool isStarted = true; 29 bool isStarted = true;
30 30
  31 + void _startOrStop() {
  32 + if (isStarted) {
  33 + controller.stop();
  34 + } else {
  35 + controller.start().catchError((error) {
  36 + final exception = error as MobileScannerException;
  37 +
  38 + switch (exception.errorCode) {
  39 + case MobileScannerErrorCode.controllerUninitialized:
  40 + break; // This error code is not used by `start()`.
  41 + case MobileScannerErrorCode.genericError:
  42 + debugPrint('Scanner failed to start');
  43 + break;
  44 + case MobileScannerErrorCode.permissionDenied:
  45 + debugPrint('Camera permission denied');
  46 + break;
  47 + }
  48 + });
  49 + }
  50 +
  51 + setState(() {
  52 + isStarted = !isStarted;
  53 + });
  54 + }
  55 +
31 @override 56 @override
32 Widget build(BuildContext context) { 57 Widget build(BuildContext context) {
33 return Scaffold( 58 return Scaffold(
@@ -112,12 +137,7 @@ class _BarcodeScannerReturningImageState @@ -112,12 +137,7 @@ class _BarcodeScannerReturningImageState
112 ? const Icon(Icons.stop) 137 ? const Icon(Icons.stop)
113 : const Icon(Icons.play_arrow), 138 : const Icon(Icons.play_arrow),
114 iconSize: 32.0, 139 iconSize: 32.0,
115 - onPressed: () => setState(() {  
116 - isStarted  
117 - ? controller.stop()  
118 - : controller.start();  
119 - isStarted = !isStarted;  
120 - }), 140 + onPressed: _startOrStop,
121 ), 141 ),
122 Center( 142 Center(
123 child: SizedBox( 143 child: SizedBox(