【Flutter】エラー対応 assets_audio_player

エラー内容

下記Gitでイシューに上がっていますが、根本的な解決策はまだ挙がってなさそうです。
https://github.com/florent37/Flutter-AssetsAudioPlayer/issues/399

e: /Users/yo4hi6o/flutter/.pub-cache/hosted/pub.dartlang.org/assets_audio_player-2.0.13+1/android/src/main/kotlin/com/github/florent37/assets_audio_player/Player.kt: (542, 5): 'handleMessage' overrides nothing
e: /Users/yo4hi6o/flutter/.pub-cache/hosted/pub.dartlang.org/assets_audio_player-2.0.13+1/android/src/main/kotlin/com/github/florent37/assets_audio_player/Player.kt: (543, 29): Type mismatch: inferred type is Message? but Message was expected
e: /Users/yo4hi6o/flutter/.pub-cache/hosted/pub.dartlang.org/assets_audio_player-2.0.13+1/android/src/main/kotlin/com/github/florent37/assets_audio_player/notification/NotificationActionReceiver.kt: (12, 85): Type mismatch: inferred type is String? but String was expected
e: /Users/yo4hi6o/flutter/.pub-cache/hosted/pub.dartlang.org/assets_audio_player-2.0.13+1/android/src/main/kotlin/com/github/florent37/assets_audio_player/notification/NotificationActionReceiver.kt: (30, 39): Type mismatch: inferred type is Intent? but Intent was expected

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':assets_audio_player:compileDebugKotlin'.
> Compilation error. See log for more details

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 37s
The built failed likely due to AndroidX incompatibilities in a plugin. The tool is about to try using Jetfier to solve the incompatibility.
Building plugin assets_audio_player...
Running Gradle task 'assembleAarRelease'...


FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':compileReleaseAidl'.
> SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable or by setting the sdk.dir path in your project's local properties file at '/Users/yo4hi6o/flutter/.pub-cache/hosted/pub.dartlang.org/assets_audio_player-2.0.13+1/android/local.properties'.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s

Exception: The plugin assets_audio_player could not be built due to the issue above.


* What went wrong:
Execution failed for task ':assets_audio_player:compileDebugKotlin'.
> Compilation error. See log for more details

解決方法

buildgradle4.1.0→4.0.1 へダウングレード

android/build.gradle

    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.0'//ここを4.0.1に変更
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }

イシューでは他で問題が発生するなど議題になっていますが、私の場合、
現時点でのFirebase最新版のパッケージと互換しております。