Initial commit
This commit is contained in:
Lucas Oskorep
+270
@@ -0,0 +1,270 @@
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import 'package:flutter/material.dart';
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import 'package:logger/logger.dart';
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import 'package:camera/camera.dart';
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var logger = Logger(
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printer: PrettyPrinter(),
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);
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late List<CameraDescription> _cameras;
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Future<void> main() async {
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try {
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WidgetsFlutterBinding.ensureInitialized();
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_cameras = await availableCameras();
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} on CameraException catch (e) {
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logger.e('Error in fetching the cameras:', e);
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}
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_cameras = await availableCameras();
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({Key? key}) : super(key: key);
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Tensordex',
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theme: ThemeData(
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// This is the theme of your application.
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//
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// Try running your application with "flutter run". You'll see the
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// application has a blue toolbar. Then, without quitting the app, try
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// changing the primarySwatch below to Colors.green and then invoke
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// "hot reload" (press "r" in the console where you ran "flutter run",
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// or simply save your changes to "hot reload" in a Flutter IDE).
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// Notice that the counter didn't reset back to zero; the application
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// is not restarted.
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primarySwatch: Colors.lightBlue,
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),
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home: const TensordexHome(title: 'Tensordex'),
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);
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}
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}
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class TensordexHome extends StatefulWidget {
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const TensordexHome({Key? key, required this.title}) : super(key: key);
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// This widget is the home page of your application. It is stateful, meaning
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// that it has a State object (defined below) that contains fields that affect
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// how it looks.
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// This class is the configuration for the state. It holds the values (in this
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// case the title) provided by the parent (in this case the App widget) and
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// used by the build method of the State. Fields in a Widget subclass are
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// always marked "final".
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final String title;
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@override
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State<TensordexHome> createState() => _TensordexHomeState();
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}
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class _TensordexHomeState extends State<TensordexHome> with WidgetsBindingObserver {
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int _counter = 0;
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late CameraController controller;
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bool _isCameraInitialized = false;
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void _incrementCounter() {
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setState(() {
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// This call to setState tells the Flutter framework that something has
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// changed in this State, which causes it to rerun the build method below
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// so that the display can reflect the updated values. If we changed
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// _counter without calling setState(), then the build method would not be
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// called again, and so nothing would appear to happen.
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_counter++;
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logger.d("Counter Incremented!");
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logger.w("Counter Incremented!");
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logger.e("Counter Incremented!");
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});
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}
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void onNewCameraSelected(CameraDescription cameraDescription) async {
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final previousCameraController = controller;
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// Instantiating the camera controller
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final CameraController cameraController = CameraController(
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cameraDescription,
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ResolutionPreset.high,
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imageFormatGroup: ImageFormatGroup.jpeg,
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);
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// Dispose the previous controller
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await previousCameraController.dispose();
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// Replace with the new controller
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if (mounted) {
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setState(() {
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controller = cameraController;
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});
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}
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// Update UI if controller updated
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cameraController.addListener(() {
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if (mounted) setState(() {});
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});
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// Initialize controller
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try {
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await cameraController.initialize();
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} on CameraException catch (e) {
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logger.e('Error initializing camera:', e);
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}
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// Update the Boolean
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if (mounted) {
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setState(() {
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_isCameraInitialized = controller.value.isInitialized;
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});
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}
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}
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@override
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void didChangeAppLifecycleState(AppLifecycleState state) {
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final CameraController cameraController = controller;
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switch (state) {
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case AppLifecycleState.resumed:
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// --
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logger.i('Resumed');
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break;
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case AppLifecycleState.inactive:
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// --
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logger.i('Inactive');
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break;
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case AppLifecycleState.paused:
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// --
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logger.i('Paused');
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break;
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case AppLifecycleState.detached:
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// --
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logger.i('Detached');
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break;
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}
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// App state changed before we got the chance to initialize.
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if (!cameraController.value.isInitialized) {
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return;
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}
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if (state == AppLifecycleState.inactive) {
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// Free up memory when camera not active
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cameraController.dispose();
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} else if (state == AppLifecycleState.resumed) {
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// Reinitialize the camera with same properties
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onNewCameraSelected(cameraController.description);
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}
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}
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance.addObserver(this);
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controller = CameraController(_cameras[0], ResolutionPreset.max);
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controller.initialize().then((_) {
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if (!mounted) {
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return;
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}
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setState(() {onNewCameraSelected(_cameras[0]);});
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}).catchError((Object e) {
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if (e is CameraException) {
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switch (e.code) {
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case 'CameraAccessDenied':
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logger.w('User denied camera access.');
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controller.initialize().then((_) {
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if (!mounted) {
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return;
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}
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setState(() {});
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}).catchError((Object e) {
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if (e is CameraException) {
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switch (e.code) {
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case 'CameraAccessDenied':
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logger.i('User denied camera access.');
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break;
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default:
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logger.i('Handle other errors.');
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break;
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}
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}
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});
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break;
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default:
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logger.i('Handle other errors.');
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break;
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}
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}
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});
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}
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@override
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void dispose() {
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controller.dispose();
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WidgetsBinding.instance.removeObserver(this);
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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// This method is rerun every time setState is called, for instance as done
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// by the _incrementCounter method above.
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//
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// The Flutter framework has been optimized to make rerunning build methods
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// fast, so that you can just rebuild anything that needs updating rather
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// than having to individually change instances of widgets.
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return Scaffold(
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appBar: AppBar(
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// Here we take the value from the MyHomePage object that was created by
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// the App.build method, and use it to set our appbar title.
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title: Text(widget.title),
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),
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body: Center(
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// Center is a layout widget. It takes a single child and positions it
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// in the middle of the parent.
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child: Column(
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// Column is also a layout widget. It takes a list of children and
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// arranges them vertically. By default, it sizes itself to fit its
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// children horizontally, and tries to be as tall as its parent.
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//
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// Invoke "debug painting" (press "p" in the console, choose the
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// "Toggle Debug Paint" action from the Flutter Inspector in Android
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// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
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// to see the wireframe for each widget.
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//
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// Column has various properties to control how it sizes itself and
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// how it positions its children. Here we use mainAxisAlignment to
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// center the children vertically; the main axis here is the vertical
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// axis because Columns are vertical (the cross axis would be
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// horizontal).
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const Text(
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'You have pushed the button this many times:',
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),
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Text(
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'$_counter',
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style: Theme.of(context).textTheme.headline4,
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),
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controller.value.isInitialized
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? CameraPreview(controller)
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: const Text("Please enable the camera!"),
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],
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),
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),
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floatingActionButton: GestureDetector(
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onLongPress: () {
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_incrementCounter();
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},
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child: FloatingActionButton(
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onPressed: _incrementCounter,
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tooltip: 'Increment',
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child: const Icon(Icons.photo_camera),
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), // This trailing comma makes auto-formatting nicer for build methods.
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));
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}
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}
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