camera_view.dart

import 'package:camera/camera.dart';
import 'package:flutter/material.dart';

/// CameraApp is the Main Application.
class CameraView extends StatefulWidget {
  /// Default Constructor
  const CameraView({super.key});

  @override
  State<CameraView> createState() => _CameraViewState();
}

class _CameraViewState extends State<CameraView> {
  late CameraController controller;
  bool isInited = false;

  XFile? picture;

  @override
  void initState() {
    super.initState();

    List<CameraDescription> cameras;
    availableCameras().then((List<CameraDescription> onValue) {
      cameras = onValue;
      controller = CameraController(cameras[0], ResolutionPreset.medium);

      controller.initialize().then((_) {
        if (!mounted) {
          return;
        }
        setState(() {});
        isInited = true;
      }).catchError((Object e) {
        if (e is CameraException) {
          switch (e.code) {
            case 'CameraAccessDenied':
              // Handle access errors here.
              break;
            default:
              // Handle other errors here.
              break;
          }
        }
      });
    });
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (!isInited) {
      return const Center(
        child: CircularProgressIndicator(),
      );
    }

    if (!controller.value.isInitialized) {
      return Container();
    }
    return Scaffold(
        appBar: AppBar(title: const Text('Camera View')),
        body: Center(
            child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            SizedBox(
              width: 300,
              height: 260,
              child: CameraPreview(controller),
            ),
            const SizedBox(height: 20),
            ElevatedButton(
              onPressed: onTakePictureButtonPress,
              // onPressed: () => {},
              child: const Text('Capture'),
            )
          ],
        )));
  }

  void onTakePictureButtonPress() {
    takePicture().then((XFile? file) {
      print('onTakePictureButtonPress triggered');
      if (mounted) {
        setState(() {
          picture = file;
        });

        print('file saved to ${file?.path}');
        file?.saveTo('/home/felipe').then((_) {
          file.length().then((val) {
            print('size: ${val / 0.001}');
          });
        });
      }
    });
  }

  Future<XFile?> takePicture() async {
    if (!controller.value.isInitialized) {
      print('cant take picture, controller not inited');
      return null;
    }
    try {
      final XFile file = await controller.takePicture();
      return file;
    } on CameraException catch (e) {
      print('error on controller.takePicture() was: ${e.code}');
      return null;
    }
  }
}