“ :5# eRhttps://developer.android.com/studio/write/java8-support#library-desugaring has more details on this. Note that you must enable core library desugaring on every module, but you'll get only 1 copy of the desugar_jdk_lib in your final APK. In the release variant, AGP will ensure that any unused APIs from desugar_jdk_lib are removed, so your APK will increase only because of APIs that are actually used. Hope that helps. ”