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AndroidでLocalDateを使おうとしてハマった

Last updated at Posted at 2021-02-12

AndroidでLocalDateを使いたくてJava 8+ API の desugar のサポートに従って以下の設定を入れた。

compileOptions {
    coreLibraryDesugaringEnabled true
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

dependencies {
    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.1'
}

そして、ビルドして、実行すると……クラッシュ!

なんでかな〜と思ってググっていたら、
https://issuetracker.google.com/issues/157681341

Could you have a quick go at trying to have the isCoreLibraryDesugaringEnabled enabled just for the main app module

と書いてあった。
なるほど、自分が↑の設定を入れたのはaarモジュールだった。
アプリのメインモジュールの方にも同じ設定を入れたら、実行できた!

モジュールを細かく分けてAndroidアプリをビルドしている方はお気をつけを〜

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