Hi, I have imported the pda_listener.dar & pda_source.dart files, but when I run mi application in debug mode and use print() sentences in order to track the execution order, the onEvent event is not triggered.

After to finish the execution, the next message appears: I/PdaScannerPlugin(17438): PdaScannerPlugin:onCancel

Also I have test with the example posted in git with the same results.

I'm working with a Honeywell - EDA50 - SO Android 7.1.1 device.

Do I need to configure something particular in the device or do you think that I missing something?

遇到以下的问题。可能必须升级？

The plugin `flutter_pda_scanner` uses a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to see if this plugin supports the Android V2 embedding. Otherwise, consider removing it since a future release of Flutter will remove these deprecated APIs.
If you are plugin author, take a look at the docs for migrating the plugin to the V2 embedding: [https://flutter.dev/go/android-plugin-migration]().

Flutter：2.2.2
Dart 2.13.3 pda_scanner: ^0.2.9

Steps to Reproduce

Logs

Launching lib\main.dart on PDT 90P in debug mode... lib\main.dart:1 √ Built build\app\outputs\flutter-apk\app-debug.apk. Connecting to VM Service at ws://127.0.0.1:51123/JgsC93lg0fE=/ws D/AndroidRuntime(21619): Shutting down VM E/AndroidRuntime(21619): FATAL EXCEPTION: main E/AndroidRuntime(21619): Process: com.example.ys_pda, PID: 21619 E/AndroidRuntime(21619): java.lang.RuntimeException: Error receiving broadcast Intent { act=com.android.server.scannerservice.broadcast flg=0x10 (has extras) } in com.shinow.pda_scanner.PdaScannerPlugin$1@3aeda31f E/AndroidRuntime(21619): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:876) E/AndroidRuntime(21619): at android.os.Handler.handleCallback(Handler.java:739) E/AndroidRuntime(21619): at android.os.Handler.dispatchMessage(Handler.java:95) E/AndroidRuntime(21619): at android.os.Looper.loop(Looper.java:135) E/AndroidRuntime(21619): at android.app.ActivityThread.main(ActivityThread.java:5254) E/AndroidRuntime(21619): at java.lang.reflect.Method.invoke(Native Method) E/AndroidRuntime(21619): at java.lang.reflect.Method.invoke(Method.java:372) E/AndroidRuntime(21619): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902) E/AndroidRuntime(21619): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:697) E/AndroidRuntime(21619): Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.EventChannel$EventSink.success(java.lang.Object)' on a null object reference E/AndroidRuntime(21619): at com.shinow.pda_scanner.PdaScannerPlugin$1.onReceive(PdaScannerPlugin.java:30) E/AndroidRuntime(21619): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:866) E/AndroidRuntime(21619): ... 8 more I/Process (21619): Sending signal. PID: 21619 SIG: 9 Lost connection to device. Exited (sigterm)

Steps to Reproduce

1.当我首次初始化pda_scanner的时候，用扫码枪扫描是可以得到条码的信息的，但是当我离开页面的时候再次进入 扫描就没有反应了 import 'package:flutter/material.dart'; import 'package:pda_scanner/pda_source.dart'; import 'package:pda_scanner/pda_listener_mixin.dart';

class PdaScan extends StatefulWidget { @override _PdaScanState createState() => _PdaScanState(); }

class _PdaScanState extends State with PdaListenerMixin { var _code; var _error; @override void initState() { print('init'); PdaSource.init(); super.initState(); } @override void dispose() { print('dispose'); PdaSource.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( body: Container( child: Center( child: Text('$_code'), ) ), ); } @override void onEvent(Object code) { // TODO: implement onEvent setState(() { _code=code; }); } @override void onError(Object error) { // TODO: implement onError print(error); setState(() { _error=error; }); } }

Logs

第一次在释放生命周期的时候会提示 PdaScannerPlugin:onCancel; I/PdaScannerPlugin( 4629): PdaScannerPlugin:onCancel

class _MainPageState extends State with PdaListenerMixin { var _code; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(), body: Container( child: TextField( focusNode: new FocusNode(), onEditingComplete: () { print("回车"); }, onSubmitted: (value) { print("值：" + value); }, ), ), ); }

@override void onEvent(Object event) { print(event); }

@override void onError(Object error) { print(error); } }