ipda_scanner 0.1.1-alpha

This is a plugin to scan barcodes by using IPDA PDA Android devices.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:ipda_scanner/ipda_scanner.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp>
    with WidgetsBindingObserver
    implements ScannerCallBack {
  IPdaScanner scanner = IPdaScanner();
  String scannedCode = 'Empty';
  bool scannerEnabled = false;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    scanner.setScannerCallBack(this);
  }

  @override
  void onDecoded(String result) {
    setState(() {
      scannedCode = result;
    });
  }

  @override
  void onError(Exception error) {
    setState(() {
      scannedCode = error.toString();
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('IPda scanner example'),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Scanner: ${scannerEnabled ? "Started" : "Stopped"}',
              style:
                  TextStyle(color: scannerEnabled ? Colors.blue : Colors.red),
            ),
            Divider(
              color: Colors.transparent,
            ),
            Text('Scanned code: $scannedCode'),
            Divider(
              color: Colors.transparent,
            ),
            ElevatedButton(
              child: Text("Start Scanner"),
              onPressed: () {
                scanner.startScanner();
                scannerEnabled = true;
                setState(() {});
              },
            ),
            Divider(
              color: Colors.transparent,
            ),
            ElevatedButton(
              child: Text("Stop Scanner"),
              onPressed: () {
                scanner.stopScanner();
                scannerEnabled = false;
                setState(() {});
              },
            ),
          ],
        ),
      ),
    );
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);
    if (state == null) return;
    switch (state) {
      case AppLifecycleState.resumed:
        if (scanner != null) scanner.resumeScanner();
        break;
      case AppLifecycleState.inactive:
        if (scanner != null) scanner.pauseScanner();
        break;
      case AppLifecycleState
          .paused: //AppLifecycleState.paused is used as stopped state because deactivate() works more as a pause for lifecycle
        if (scanner != null) scanner.pauseScanner();
        break;
      case AppLifecycleState.detached:
        if (scanner != null) scanner.pauseScanner();
        break;
      default:
        break;
    }
  }

  @override
  void dispose() {
    if (scanner != null) scanner.stopScanner();
    super.dispose();
  }
}