logging - Android NDK C++ library print log on android studio? -

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hi building c++ native library based on android ndk tool. however, couldn't figured out how print log in c++ file android logcat. here have done.

i have follow this guide. add __android_log_print(android_log_info, "log", "hi logg");

include android/log.h

and 

android { defaultconfig {     ndk {         modulename "modulename"         ldlibs "log"     } }

the app able compile there's no log printed. can me?


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