How to call JNIHelp.h via NDK？

StackOverflow https://stackoverflow.com/questions/23331806

  •  10-07-2023
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Question

I am trying to write an JNI file and it includes JNIHelp.h, however I met some error:

jni/JNIMPEG4Writer.cpp:4:21: fatal error: JNIHelp.h: No such file or directory
compilation terminated.

I guess I should add something to the Android.mk file, but I am not sure what should I add. This is my Android.mk file: LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE                    := JNIMPEG4Writer
LOCAL_STATIC_LIBRARIES  := MPEG4Writer
#LOCAL_LDLIBS                    := -llog
LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib –llog
LOCAL_SRC_FILES                 := JNIMPEG4Writer.cpp

include $(BUILD_SHARED_LIBRARY)

Does anyone have any ideas? Thanks!

Was it helpful?

Solution

JNIHelp.h is not part of NDK. You inherited some code from the Android platform. You will find other dependencies on non-public modules, most likely libcutils and libutils.

You have three options: build your code as a module of the platform, rewrite the code to only use public headers and libraries, or download parts of the platform, e.g. https://android.googlesource.com/platform/libnativehelper/, and arrange the include paths accordingly.

To satisfy the linker in the latter scenario, you can use adb pull /system/lib to acquire the versions of libnativehelper.so, libcutils.so, and other referenced non-public libraries. Note that ndk-build will complain about linking against these libraries.

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