【Android Studio】Empty Activityのビルドエラー"3 issues were found when checking AAR metadata"【Kotlin】

本記事では、Android Studioにて、Kotlinでアプリを作成しようとした際に起きたビルドエラーと、その解消方法を紹介します。

実行環境

Windows10
Android Studio Giraffe

前提

今回は、以下のようにテンプレートを選んでいます。

New Project > Empty Activity

古いバージョンのAndroid Studioだと、Empty Compose Activityと表示されるようです。

参考：
Why empty compose activity not found in Android Studio Flamingo | 2022.2.1 – Stack Overflow

エラー内容

今回は、テンプレートを使用して作成したプロジェクトを、特に編集することもなくビルドしただけです。通常は、ビルドが完了して、アプリを起動すると、Hello Worldが表示されるはずです。しかし、以下のようなエラーが発生してしまいました。

調べてみたところ、他にも困っている方はおり、割とよくあるエラーのようです。

参考：
https://stackoverflow.com/questions/75122196/android-studio-error-6-issues-were-found-when-checking-aar-metadata

３つも問題があるの？とあたふたしましたが、よく見るとほとんど同じ内容が3回繰り返されています。Recommended action（推奨するアクション）まで丁寧に教えてくれています。

3 issues were found when checking AAR metadata:

  1.  Dependency 'androidx.activity:activity:1.8.1' requires libraries and applications that
      depend on it to compile against version 34 or later of the
      Android APIs.

      :app is currently compiled against android-33.

      Also, the maximum recommended compile SDK version for Android Gradle
      plugin 8.1.0 is 33.

      Recommended action: Update this project's version of the Android Gradle
      plugin to one that supports 34, then update this project to use
      compileSdk of at least 34.

      Note that updating a library or application's compileSdk (which
      allows newer APIs to be used) can be done separately from updating
      targetSdk (which opts the app in to new runtime behavior) and
      minSdk (which determines which devices the app can be installed
      on).

  2.  Dependency 'androidx.activity:activity-ktx:1.8.1' requires libraries and applications that
      depend on it to compile against version 34 or later of the
      Android APIs.

      :app is currently compiled against android-33.

      Also, the maximum recommended compile SDK version for Android Gradle
      plugin 8.1.0 is 33.

      Recommended action: Update this project's version of the Android Gradle
      plugin to one that supports 34, then update this project to use
      compileSdk of at least 34.

      Note that updating a library or application's compileSdk (which
      allows newer APIs to be used) can be done separately from updating
      targetSdk (which opts the app in to new runtime behavior) and
      minSdk (which determines which devices the app can be installed
      on).

  3.  Dependency 'androidx.activity:activity-compose:1.8.1' requires libraries and applications that
      depend on it to compile against version 34 or later of the
      Android APIs.

      :app is currently compiled against android-33.

      Also, the maximum recommended compile SDK version for Android Gradle
      plugin 8.1.0 is 33.

      Recommended action: Update this project's version of the Android Gradle
      plugin to one that supports 34, then update this project to use
      compileSdk of at least 34.

      Note that updating a library or application's compileSdk (which
      allows newer APIs to be used) can be done separately from updating
      targetSdk (which opts the app in to new runtime behavior) and
      minSdk (which determines which devices the app can be installed
      on).