[android-developers] Should i use ndk or jni when i want to call C function in JAVA core libraries?

Maybe NDK can only be used in calling C function in Android
application files but i am not sure. If so, what should i do if i want
to call C function in JAVA core libraries such as "/android-x86/dalvik/
libcore/luni/src/main/java/java/net/InetAddress.java"?

Thanks!

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