contact_tracing/lib/main.dart

import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
import 'package:flutter_sms/flutter_sms.dart';

void main() {
  runApp(const AnalyzeView());
}

class AnalyzeView extends StatefulWidget {
  const AnalyzeView({Key? key}) : super(key: key);

  @override
  AnalyzeViewState createState() => AnalyzeViewState();
}

class AnalyzeViewState extends State<AnalyzeView>
    with SingleTickerProviderStateMixin {
  String? barcode;
  double number = 1;

  MobileScannerController controller = MobileScannerController(
    torchEnabled: false,
    facing: CameraFacing.back,
  );

  void _sendSMS(String message, List<String> recipents) async {
    String _result = await sendSMS(message: message, recipients: recipents)
        .catchError((onError) {
      print('sms err: $onError');
    });
    print('sms res: $_result');
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.black,
        body: Builder(builder: (context) {
          return Stack(
            children: [
              MobileScanner(
                  controller: controller,
                  fit: BoxFit.contain,
                  onDetect: (barcode, args) {
                    if (this.barcode != barcode.rawValue) {
                      setState(() {
                        this.barcode = barcode.rawValue;
                      });
                      if (barcode.rawValue.startsWith('smsto:1922:')) {
                        List<String> recipents = ['0926381229'];
                        _sendSMS('test2', recipents);
                      }
                    }
                  }),
              Align(
                alignment: Alignment.bottomCenter,
                child: Container(
                    alignment: Alignment.bottomCenter,
                    height: 150,
                    color: Colors.black.withOpacity(0.4),
                    child: Column(
                      children: [
                        Row(
                          children: [
                            Center(
                              child: SizedBox(
                                width: MediaQuery.of(context).size.width,
                                height: 80,
                                child: FittedBox(
                                  child: Slider(
                                      value: number,
                                      min: 1,
                                      max: 10,
                                      label: 'Count $number',
                                      onChanged: (v) {
                                        setState(() {
                                          number = v.toInt().toDouble();
                                        });
                                      }),
                                ),
                              ),
                            ),
                          ],
                        ),
                        Row(
                          crossAxisAlignment: CrossAxisAlignment.center,
                          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                          children: [
                            IconButton(
                              color: Colors.white,
                              icon: ValueListenableBuilder(
                                valueListenable: controller.torchState,
                                builder: (context, state, child) {
                                  switch (state as TorchState) {
                                    case TorchState.off:
                                      return const Icon(Icons.flash_off,
                                          color: Colors.grey);
                                    case TorchState.on:
                                      return const Icon(Icons.flash_on,
                                          color: Colors.yellow);
                                  }
                                },
                              ),
                              iconSize: 32.0,
                              onPressed: () => controller.toggleTorch(),
                            ),
                            Center(
                              child: SizedBox(
                                width: MediaQuery.of(context).size.width - 120,
                                height: 50,
                                child: FittedBox(
                                  child: Text(
                                    barcode ?? 'Scan something!',
                                    overflow: TextOverflow.fade,
                                    style: Theme.of(context)
                                        .textTheme
                                        .headline4!
                                        .copyWith(color: Colors.white),
                                  ),
                                ),
                              ),
                            ),
                            IconButton(
                              color: Colors.white,
                              icon: ValueListenableBuilder(
                                valueListenable: controller.cameraFacingState,
                                builder: (context, state, child) {
                                  switch (state as CameraFacing) {
                                    case CameraFacing.front:
                                      return const Icon(Icons.camera_front);
                                    case CameraFacing.back:
                                      return const Icon(Icons.camera_rear);
                                  }
                                },
                              ),
                              iconSize: 32.0,
                              onPressed: () => controller.switchCamera(),
                            ),
                          ],
                        ),
                      ],
                    )),
              ),

              // Container(
              //   alignment: Alignment.bottomCenter,
              //   margin: EdgeInsets.only(bottom: 80.0),
              //   child: IconButton(
              //     icon: ValueListenableBuilder(
              //       valueListenable: cameraController.torchState,
              //       builder: (context, state, child) {
              //         final color =
              //             state == TorchState.off ? Colors.grey : Colors.white;
              //         return Icon(Icons.bolt, color: color);
              //       },
              //     ),
              //     iconSize: 32.0,
              //     onPressed: () => cameraController.torch(),
              //   ),
              // ),
            ],
          );
        }),
      ),
    );
  }

  @override
  void dispose() {
    // cameraController.dispose();
    super.dispose();
  }

  void display(Barcode barcode) {
    Navigator.of(context).popAndPushNamed('display', arguments: barcode);
  }
}