[Android] cannot access ViewTreeObserver

[zp1ke]

Describe the bug
Having this error compiling the project on Android:

android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java:39: error: cannot access ViewTreeObserver
      flutterEngine.getPlugins().add(new com.jrai.flutter_keyboard_visibility.FlutterKeyboardVisibilityPlugin());
                                ^
  class file for android.view.ViewTreeObserver not found
1 error

FAILURE: Build failed with an exception.

To Reproduce
Running project with Flutter 2.8 on Android.

Expected behavior
App compiles on Android.

Info (please complete the following information):
flutter_keyboard_visibility version: 5.1.0
Reproducible on platforms (Android, iOS, etc): Android
flutter doctor output:

[√] Flutter (Channel stable, 2.8.1, on Microsoft Windows [Version 10.0.22000.376], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.11.7)
[√] Android Studio (version 2020.3)
[√] IntelliJ IDEA Community Edition (version 2021.3)
[√] VS Code (version 1.63.2)
[√] Connected device (4 available)

• No issues found!

[MisterJimson]

Hmm unfortunately this looks like its coming from the GeneratedPluginRegistrant which Flutter is in charge of creating and maintaining. I would try deleting that file, flutter clean, flutter pub get.

If that doesn't work I would open another issue on the Flutter repo.

[zp1ke]

flutter clean, flutter pub get doesn't help. I'll try reporting on the flutter repo

[bxxasn]

Hi, have you found a good way to deal with it. If you find it, please share it. Thank you.

中文最好

[StarOfLife]

我在build.gradle中使用 classpath 'com.android.tools.build:gradle:7.0.0' 解决