How to add external library in android studio with cmake?

Question

I am trying to link live555.so and .h files with an Android project using cMake. If i don't use absolute path i'm getting error.

My cMake file:

cmake_minimum_required(VERSION 3.4.1) include_directories( ${PROJECT_SOURCE_DIR}/src/main/jniLibs/live555/include ) add_library( live555 SHARED IMPORTED ) set_target_properties( live555 PROPERTIES IMPORTED_LOCATION ${PROJECT_SOURCE_DIR}/src/main/jniLibs/live555/lib/${ANDROID_ABI}/live555.so) add_library( # Sets the name of the library. native-lib # Sets the library as a shared library. SHARED # Provides a relative path to your source file(s). src/main/cpp/native-lib.cpp ) find_library( # Sets the name of the path variable. log-lib # Specifies the name of the NDK library that # you want CMake to locate. log ) target_link_libraries( # Specifies the target library. native-lib android live555 ${log-lib} )

And error:

Error:error: '../../../../src/main/jniLibs/live555/lib/armeabi-v7a/live555.so', needed by '../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/libnative-lib.so', missing and no known rule to make it

Did you copy the .so into the src/main/jniLibs/live555/lib/armeabi-v7a directory? — James Poag
– James Poag, Commented Oct 5, 2018 at 12:31
Yes i did. If I change " ${PROJECT_SOURCE_DIR}" to absolute path it accepts otherwise gives that error. So I wonder if I have to use a system path like /usr/local... ? — Grayowl
– Grayowl, Commented Oct 5, 2018 at 13:02
Use message(STATUS ${PROJECT_SRC_DIR}) before set_target_propeties, then try to get the property after set to check it : stackoverflow.com/questions/24881408/… — James Poag
– James Poag, Commented Oct 5, 2018 at 13:20

Alex Cohn · Accepted Answer · 2018-10-07 20:48:58Z

${PROJECT_SOURCE_DIR} is the directory where the main CMakeList.txt file resides. That's typically app/src/main/cpp. You can work out the correct relative path now.

This means that you can simply write

include_directories( ${PROJECT_SOURCE_DIR}/../jniLibs/live555/include ) add_library( live555 SHARED IMPORTED ) set_target_properties( live555 PROPERTIES IMPORTED_LOCATION ${PROJECT_SOURCE_DIR}/../jniLibs/live555/lib/${ANDROID_ABI}/live555.so)

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