[BUG] [FLUTTER 1.25 & 1.26] Crash when building QRView

[bdevay]

Describe the bug
Simply copied your example into my project and tried to navigate to the barcode scanner widget. It reaches the

@override
  Widget build(BuildContext context){}

but crashes in

Widget _buildQrView(BuildContext context) {}

when it tries to build the QRView.

Flutter information
[√] Flutter (Channel dev, 1.26.0-1.0.pre, on Microsoft Windows [Version 10.0.19042.685], locale en-US)
• Flutter version 1.26.0-1.0.pre at C:\Flutter\SDK\flutter
• Framework revision 63062a6443 (6 days ago), 2020-12-13 23:19:13 +0800
• Engine revision 4797b06652
• Dart version 2.12.0 (build 2.12.0-141.0.dev)

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at C:\Android\Sdk
• Platform android-30, build-tools 30.0.3
• ANDROID_HOME = C:\Android\Sdk
• ANDROID_SDK_ROOT = C:\Android\Sdk
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
• All Android licenses accepted.

[√] Android Studio (version 4.1.0)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Connected device (1 available)
• motorola one action (mobile) • 10.0.0.7:5555 • android-arm64 • Android 10 (API 29)

• No issues found!
Process finished with exit code 0

Device (please complete the following information):

• Device: Emulator, Pixel 4 XL
• OS: Android 11.0, API 30

Screenshots
It's a crash, no screenshot available

Additional context
Stack trace:

java.lang.AbstractMethodError: abstract method "void io.flutter.plugin.platform.PlatformView.onFlutterViewAttached(android.view.View)"
    at io.flutter.plugin.platform.VirtualDisplayController.onFlutterViewAttached(VirtualDisplayController.java:181)
    at io.flutter.plugin.platform.PlatformViewsController$1.createVirtualDisplayForPlatformView(PlatformViewsController.java:233)
    at io.flutter.embedding.engine.systemchannels.PlatformViewsChannel$1.create(PlatformViewsChannel.java:104)
    at io.flutter.embedding.engine.systemchannels.PlatformViewsChannel$1.onMethodCall(PlatformViewsChannel.java:59)
    at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
    at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
    at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:738)
    at android.os.MessageQueue.nativePollOnce(Native Method)
    at android.os.MessageQueue.next(MessageQueue.java:343)
    at android.os.Looper.loop(Looper.java:188)
    at android.app.ActivityThread.main(ActivityThread.java:7617)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)

[juliansteenbakker]

This is an issue with Flutter beta & dev branch (1.25 & 1.26). There is a workaround by adding android.enableDexingArtifactTransform=false to your gradle.properties file. The issue is being tracked here.