A flutter plugin about qr code or bar code scan , it can scan from file、url、memory and camera qr code or bar code .Welcome to feedback your issue.
Add this to your package's pubspec.yaml file:
dependencies:
r_scan: last versionrequire read storage permission and camera permission, use permission_handler plugin.
import 'package:permission_handler/permission_handler.dart';
Future<bool> canReadStorage() async {
if(Platform.isIOS) return true;
var status = await PermissionHandler()
.checkPermissionStatus(PermissionGroup.storage);
if (status != PermissionStatus.granted) {
var future = await PermissionHandler()
.requestPermissions([PermissionGroup.storage]);
for (final item in future.entries) {
if (item.value != PermissionStatus.granted) {
return false;
}
}
} else {
return true;
}
return true;
}
Future<bool> canOpenCamera() async {
var status =
await PermissionHandler().checkPermissionStatus(PermissionGroup.camera);
if (status != PermissionStatus.granted) {
var future = await PermissionHandler()
.requestPermissions([PermissionGroup.camera]);
for (final item in future.entries) {
if (item.value != PermissionStatus.granted) {
return false;
}
}
} else {
return true;
}
return true;
}add the permissions in your Info.plist
<key>NSCameraUsageDescription</key>
<string>扫描二维码时需要使用您的相机</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>扫描二维码时需要访问您的相册</string>
<key>io.flutter.embedded_views_preview</key>
<true/>no another.
final result=await RScan.scanImagePath('your file path');
final result=await RScan.scanImagePath('your image url');
ByteData data=await rootBundle.load('images/qrCode.png');
final result=await RScan.scanImageMemory(data.buffer.asUint8List());
- Step First: Get available cameras
List<RScanCameraDescription> rScanCameras = await availableRScanCameras();;if you want to get it in main() method, you can use this code.
List<RScanCameraDescription> rScanCameras;
void main() async {
WidgetsFlutterBinding.ensureInitialized();
rScanCameras = await availableRScanCameras();
runApp(...);
}- Step Second:Use it.
class RScanCameraDialog extends StatefulWidget {
@override
_RScanCameraDialogState createState() => _RScanCameraDialogState();
}
class _RScanCameraDialogState extends State<RScanCameraDialog> {
RScanCameraController _controller;
bool isFirst = true;
@override
void initState() {
super.initState();
if (rScanCameras != null && rScanCameras.length > 0) {
_controller = RScanCameraController(
rScanCameras[1], RScanCameraResolutionPreset.max)
..addListener(() {
final result = _controller.result;
if (result != null) {
if (isFirst) {
Navigator.of(context).pop(result);
isFirst = false;
}
}
})
..initialize().then((_) {
if (!mounted) {
return;
}
setState(() {});
});
}
}
@override
void dispose() {
_controller?.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
if (rScanCameras == null || rScanCameras.length == 0) {
return Scaffold(
body: Container(
alignment: Alignment.center,
child: Text('not have available camera'),
),
);
}
if (!_controller.value.isInitialized) {
return Container();
}
return Scaffold(
backgroundColor: Colors.black,
body: Stack(
children: <Widget>[
ScanImageView(
child: AspectRatio(
aspectRatio: _controller.value.aspectRatio,
child: RScanCamera(_controller),
),
),
Align(
alignment: Alignment.bottomCenter,
child: FutureBuilder(
future: getFlashMode(),
builder: _buildFlashBtn,
))
],
),
);
}
Future<bool> getFlashMode() async {
bool isOpen = false;
try {
isOpen = await _controller.getFlashMode();
} catch (_) {}
return isOpen;
}
Widget _buildFlashBtn(BuildContext context, AsyncSnapshot<bool> snapshot) {
return snapshot.hasData
? Padding(
padding: EdgeInsets.only(bottom:24+MediaQuery.of(context).padding.bottom),
child: IconButton(
icon: Icon(snapshot.data ? Icons.flash_on : Icons.flash_off),
color: Colors.white,
iconSize: 46,
onPressed: () {
if (snapshot.data) {
_controller.setFlashMode(false);
} else {
_controller.setFlashMode(true);
}
setState(() {});
}),
)
: Container();
}
}import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:r_scan/r_scan.dart';
class RScanDialog extends StatefulWidget {
@override
_RScanDialogState createState() => _RScanDialogState();
}
class _RScanDialogState extends State<RScanDialog> {
RScanController _controller;
@override
void initState() {
super.initState();
initController();
}
bool isFirst=true;
Future<void> initController() async {
_controller = RScanController();
_controller.addListener(() {
final result = _controller.result;
if (result != null) {
if(isFirst){
Navigator.of(context).pop(result);
isFirst=false;
}
}
});
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
backgroundColor: Colors.black,
body: FutureBuilder<bool>(
future: canOpenCameraView(),
builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
if (snapshot.hasData && snapshot.data == true) {
return ScanImageView(
child: RScanView(
controller: _controller,
),
);
} else {
return Container();
}
},
),
),
);
}
Future<bool> canOpenCameraView() async {
var status =
await PermissionHandler().checkPermissionStatus(PermissionGroup.camera);
if (status != PermissionStatus.granted) {
var future = await PermissionHandler()
.requestPermissions([PermissionGroup.camera]);
for (final item in future.entries) {
if (item.value != PermissionStatus.granted) {
return false;
}
}
} else {
return true;
}
return true;
}
}
You can use RScanController class.
//turn off the flash lamp.
await _controller.setFlashMode(false);
//turn on the flash lamp.
await _controller.setFlashMode(true);
// get the flash lamp status.
bool isOpen = await _controller.getFlashMode();
when you scan finish,will return the RScanResult...
class RScanResult {
/// barcode type
final RScanBarType type;
///barcode message
final String message;
///barcode points include [x , y]
final List<RScanPoint> points;
}