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use the scanner example from CamerAwesome for starting point

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This commit is contained in:
Joe Ardent 2023-08-18 13:05:21 -07:00
parent 51635b2070
commit 7f1abe1261
6 changed files with 183 additions and 112 deletions
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2
mobile/android/app/build.gradle
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@ -47,7 +47,7 @@ android {
applicationId "com.nebcorp_hias.cuttle"
// You can update the following values to match your application needs.
// For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
minSdkVersion flutter.minSdkVersion
minSdkVersion 32
targetSdkVersion flutter.targetSdkVersion
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName

2
mobile/android/build.gradle
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@ -1,5 +1,5 @@
buildscript {
ext.kotlin_version = '1.7.10'
ext.kotlin_version = '1.8.22'
repositories {
google()
mavenCentral()

246
mobile/lib/main.dart
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@ -1,147 +1,173 @@
import 'dart:async';
import 'package:cuttle/utils/mlkit_utils.dart';
import 'package:camerawesome/camerawesome_plugin.dart';
import 'package:flutter/material.dart';
import 'ffi.dart' if (dart.library.html) 'ffi_web.dart';
import 'package:google_mlkit_barcode_scanning/google_mlkit_barcode_scanning.dart';
import 'package:rxdart/rxdart.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
title: 'camerAwesome App',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
const MyHomePage({super.key});
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
// These futures belong to the state and are only initialized once,
// in the initState method.
late Future<Platform> platform;
late Future<bool> isRelease;
final _barcodeScanner = BarcodeScanner(formats: [BarcodeFormat.qrCode]);
final _buffer = <String>[];
final _barcodesController = BehaviorSubject<List<String>>();
late final Stream<List<String>> _barcodesStream = _barcodesController.stream;
final _scrollController = ScrollController();
@override
void initState() {
super.initState();
platform = api.platform();
isRelease = api.rustReleaseMode();
void dispose() {
_barcodesController.close();
super.dispose();
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text("You're running on"),
// To render the results of a Future, a FutureBuilder is used which
// turns a Future into an AsyncSnapshot, which can be used to
// extract the error state, the loading state and the data if
// available.
//
// Here, the generic type that the FutureBuilder manages is
// explicitly named, because if omitted the snapshot will have the
// type of AsyncSnapshot<Object?>.
FutureBuilder<List<dynamic>>(
// We await two unrelated futures here, so the type has to be
// List<dynamic>.
future: Future.wait([platform, isRelease]),
builder: (context, snap) {
final style = Theme.of(context).textTheme.headlineMedium;
if (snap.error != null) {
// An error has been encountered, so give an appropriate response and
// pass the error details to an unobstructive tooltip.
debugPrint(snap.error.toString());
return Tooltip(
message: snap.error.toString(),
child: Text('Unknown OS', style: style),
);
}
// Guard return here, the data is not ready yet.
final data = snap.data;
if (data == null) return const CircularProgressIndicator();
// Finally, retrieve the data expected in the same order provided
// to the FutureBuilder.future.
final Platform platform = data[0];
final release = data[1] ? 'Release' : 'Debug';
final text = const {
Platform.AndroidBish: 'Android, bish',
Platform.Ios: 'iOS',
Platform.MacApple: 'MacOS with Apple Silicon',
Platform.MacIntel: 'MacOS',
Platform.Windows: 'Windows',
Platform.Unix: 'Unix',
Platform.Wasm: 'the Web',
}[platform] ??
'Unknown OS';
return Text('$text ($release)', style: style);
},
)
],
body: CameraAwesomeBuilder.previewOnly(
onImageForAnalysis: (img) => _processImageBarcode(img),
imageAnalysisConfig: AnalysisConfig(
androidOptions: const AndroidAnalysisOptions.nv21(
width: 1024,
),
maxFramesPerSecond: 5,
autoStart: false,
),
builder: (cameraModeState, previewSize, previewRect) {
return _BarcodeDisplayWidget(
barcodesStream: _barcodesStream,
scrollController: _scrollController,
analysisController: cameraModeState.analysisController!,
);
},
),
);
}
Future _processImageBarcode(AnalysisImage img) async {
final inputImage = toInputImage(img as Nv21Image);
try {
var recognizedBarCodes = await _barcodeScanner.processImage(inputImage);
for (Barcode barcode in recognizedBarCodes) {
debugPrint("Barcode: [${barcode.format}]: ${barcode.rawBytes}");
_addBarcode("[${barcode.format.name}]: ${barcode.rawValue}");
}
} catch (error) {
debugPrint("...sending image resulted error $error");
}
}
void _addBarcode(String value) {
try {
if (_buffer.length > 300) {
_buffer.removeRange(_buffer.length - 300, _buffer.length);
}
if (_buffer.isEmpty || value != _buffer[0]) {
_buffer.insert(0, value);
_barcodesController.add(_buffer);
_scrollController.animateTo(
0,
duration: const Duration(milliseconds: 400),
curve: Curves.fastLinearToSlowEaseIn,
);
}
} catch (err) {
debugPrint("...logging error $err");
}
}
}
class _BarcodeDisplayWidget extends StatefulWidget {
final Stream<List<String>> barcodesStream;
final ScrollController scrollController;
final AnalysisController analysisController;
const _BarcodeDisplayWidget({
// ignore: unused_element
super.key,
required this.barcodesStream,
required this.scrollController,
required this.analysisController,
});
@override
State<_BarcodeDisplayWidget> createState() => _BarcodeDisplayWidgetState();
}
class _BarcodeDisplayWidgetState extends State<_BarcodeDisplayWidget> {
@override
Widget build(BuildContext context) {
return Align(
alignment: Alignment.bottomCenter,
child: Container(
decoration: BoxDecoration(
color: Colors.tealAccent.withOpacity(0.7),
),
child: Column(mainAxisSize: MainAxisSize.min, children: [
Material(
color: Colors.transparent,
child: CheckboxListTile(
value: widget.analysisController.enabled,
onChanged: (newValue) async {
if (widget.analysisController.enabled == true) {
await widget.analysisController.stop();
} else {
await widget.analysisController.start();
}
setState(() {});
},
title: const Text(
"Enable barcode scan",
style: TextStyle(fontWeight: FontWeight.bold),
),
),
),
Container(
height: 120,
padding: const EdgeInsets.symmetric(horizontal: 16),
child: StreamBuilder<List<String>>(
stream: widget.barcodesStream,
builder: (context, value) => !value.hasData
? const SizedBox.expand()
: ListView.separated(
padding: const EdgeInsets.only(top: 8),
controller: widget.scrollController,
itemCount: value.data!.length,
separatorBuilder: (context, index) =>
const SizedBox(height: 4),
itemBuilder: (context, index) => Text(value.data![index]),
),
),
),
]),
),
);
}

14
mobile/lib/utils/file_utils.dart Normal file
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@ -0,0 +1,14 @@
import 'dart:io';
import 'package:camerawesome/camerawesome_plugin.dart';
import 'package:path_provider/path_provider.dart';
Future<String> path(CaptureMode captureMode) async {
final Directory extDir = await getTemporaryDirectory();
final testDir =
await Directory('${extDir.path}/test').create(recursive: true);
final String fileExtension = captureMode == CaptureMode.photo ? 'jpg' : 'mp4';
final String filePath =
'${testDir.path}/${DateTime.now().millisecondsSinceEpoch}.$fileExtension';
return filePath;
}

23
mobile/lib/utils/mlkit_utils.dart Normal file
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@ -0,0 +1,23 @@
import 'package:camerawesome/camerawesome_plugin.dart';
import 'package:google_mlkit_commons/google_mlkit_commons.dart';
InputImage toInputImage(Nv21Image aimg) {
final planeData = aimg.planes
.map((e) => InputImagePlaneMetadata(
bytesPerRow: e.bytesPerRow, height: aimg.height, width: aimg.width))
.toList();
return InputImage.fromBytes(
bytes: aimg.bytes,
inputImageData: InputImageData(
imageRotation: getRotation(aimg),
inputImageFormat: InputImageFormat.nv21,
planeData: planeData,
size: aimg.size,
),
);
}
InputImageRotation getRotation(AnalysisImage img) {
return InputImageRotation.values.byName(img.rotation.name);
}

8
mobile/pubspec.yaml
View file

@ -38,6 +38,14 @@ dependencies:
flutter_rust_bridge: ^1.45.0
meta: ^1.8.0
uuid: ^3.0.7
path_provider: ^2.1.0
path: ^1.8.3
mobile_scanner: ^3.4.1
camerawesome: ^1.4.0
google_mlkit_barcode_scanning: ^0.5.0
rxdart: ^0.27.7
image: ^4.0.17
google_mlkit_commons: ^0.2.0
dev_dependencies:
flutter_test: