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I currently using android NDK to write some native code in C. I have learned that using JNI we can make two way calls from java to C and from C to java.
I am curious if using JNI introduces an extra thread implicitly or is it still one main() thread for the app ?
Thanks,
Dalvik Java VM in Android calls the native code from the current Java-thread. It can be any thread – UI or any other. Your native code is free to spawn new threads at will.
Of course, the call java->native->java will return to the same thread it was invoked in.