demo_scan 0.0.2

demo_scan: ^0.0.2 copied to clipboard

example/lib/main.dart

import 'dart:math';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:demo_scan/demo_scan.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';

  final _demoScanPlugin = DemoScan();

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

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      platformVersion =
          await _demoScanPlugin.getPlatformVersion() ?? 'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: Stack(
            children: [
              Text('Running on: $_platformVersion\n'),
            ],
          )
        ),
        floatingActionButton: FloatingActionButton(
          child: Text(
            "扫码",
            style: TextStyle(
                color: Colors.black
            ),
          ),
          backgroundColor: Colors.white,
          onPressed: () {
            if (defaultTargetPlatform == TargetPlatform.android) {
              scan();
            } else if (defaultTargetPlatform == TargetPlatform.iOS) {
              scan();
            } else {
              print("Platform is not yet supported by this plugin");
            }
          },
        ),
      ),
    );
  }

  Future scan() async {
    print("扫码开始");
    try {
      String barcode = await DemoScan.scan();
      print("扫码结果： ${barcode}");
      DemoScan.dismiss();
      setState(() {
        print("扫码结束");
      });
    } on PlatformException catch (e) {
      setState(() {
        print("3333");
        print(e);
      });
    } on FormatException {
      setState(() {
        print("4444");
        print("-----");
      });
    } catch (e) {
      setState(() {
        print("5555");
        print(e);
      });
    }
  }

}