flutter_qr_reader 1.0.5 flutter_qr_reader: ^1.0.5 copied to clipboard
QR code (scan QRCode and picture) recognition (AndroidView/UiKitView)
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter_qr_reader/flutter_qr_reader.dart';
import 'package:flutter_qr_reader_example/qrcode_reader_view.dart';
import 'package:image_picker/image_picker.dart';
import 'package:permission_handler/permission_handler.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
bool _flashlightState = false;
bool _showScanView = false;
QrReaderViewController? _controller;
@override
void initState() {
super.initState();
}
void alert(String tip) {
ScaffoldMessenger.of(scaffoldKey.currentContext!).showSnackBar(SnackBar(content: Text(tip)));
}
void openScanUI(BuildContext context) async {
if (_showScanView) {
await stopScan();
}
Navigator.of(context).push(MaterialPageRoute(builder: (context) {
return new Scaffold(
body: QrcodeReaderView(
onScan: (result) async {
Navigator.of(context).pop();
alert(result);
},
headerWidget: AppBar(
backgroundColor: Colors.transparent,
elevation: 0.0,
),
),
);
}));
}
Future<bool> permission() async {
if (_openAction) return false;
_openAction = true;
var status = await Permission.camera.status;
print(status);
if (status.isDenied || status.isPermanentlyDenied) {
status = await Permission.camera.request();
print(status);
}
if (status.isRestricted) {
alert("请必须授权照相机权限");
await Future.delayed(Duration(seconds: 3));
openAppSettings();
_openAction = false;
return false;
}
if (!status.isGranted) {
alert("请必须授权照相机权限");
_openAction = false;
return false;
}
_openAction = false;
return true;
}
bool _openAction = false;
Future openScan(BuildContext context) async {
if (false == await permission()) {
return;
}
setState(() {
_showScanView = true;
});
}
Future startScan() async {
assert(_controller != null);
_controller?.startCamera((String result, _) async {
await stopScan();
showDialog(
context: scaffoldKey.currentContext!,
builder: (context) {
return AlertDialog(
title: Text('扫码结果'),
content: Text(result),
).build(context);
},
);
});
}
Future stopScan() async {
assert(_controller != null);
await _controller?.stopCamera();
setState(() {
_showScanView = false;
});
}
Future flashlight() async {
assert(_controller != null);
final state = await _controller?.setFlashlight();
setState(() {
_flashlightState = state ?? false;
});
}
Future imgScan() async {
var image = await ImagePicker().getImage(source: ImageSource.gallery);
if (image == null) return;
final rest = await FlutterQrReader.imgScan(image.path);
showDialog(
context: scaffoldKey.currentContext!,
builder: (context) {
return AlertDialog(
title: Text('扫码结果'),
content: Text(rest),
).build(context);
},
);
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
key: scaffoldKey,
appBar: AppBar(
title: const Text('二维码扫描演示'),
),
body: Builder(builder: (context) {
return Column(
children: [
TextButton(onPressed: () => openScanUI(context), child: Text('打开扫描界面')),
TextButton(
onPressed: imgScan,
child: Text("识别图片"),
),
Container(
height: 1,
margin: EdgeInsets.symmetric(vertical: 12),
color: Colors.black12,
),
_showScanView == false ? TextButton(onPressed: () => openScan(context), child: Text('启动扫描视图')) : Text('扫描视图已经启动'),
TextButton(onPressed: flashlight, child: Text(_flashlightState == false ? '打开手电筒' : '关闭手电筒')),
Container(
height: 12,
color: Colors.black12,
),
_showScanView == true
? Container(
width: 320,
height: 350,
child: QrReaderView(
width: 320,
height: 350,
callback: (container) {
this._controller = container;
this.startScan();
},
),
)
: Container()
],
);
}),
),
);
}
}