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Androidのライブラリプロジェクト内のKotlinクラスを参照するとUnresolved referenceが出る問題対処

Last updated at Posted at 2019-04-04

Androidプロジェクトから別のAndoridライブラリプロジェクト内のKotlinクラスを参照した時に、Unresolved referenceとなりビルドエラー発生。1hくらいはまったのでメモを残す。

原因

ライブラリプロジェクトのbuild.gradleにKotlin用の記述が漏れているため。
(Androidライブラリプロジェクト作成時、Kotlin用の記述は自動生成されない)

解決方法

ライブラリプロジェクトを開いて、以下を実施。
Tools -> Kotlin -> 'Configure Kotlin in projects'
(All modules with Kotlin files are configured'を選択してOK。

参考

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