"The entire feature-set of the Android OS is available to you through APIs written in the Java language."

"compile Java sources into DEX bytecode, which can run on the Android platform."

"Android also includes a set of core runtime libraries that provide most of the functionality of the Java programming language, including some Java 8 language features, that the Java API framework uses."

https://developer.android.com/guide/platform/

Given how hard you support Google's fragmentation actions against the Java eco-system, your OS also uses C without libc.