CMakeLists.txt

cmake_minimum_required(VERSION 3.6.0)

add_library(native_app_glue STATIC
    ${ANDROID_NDK}/sources/android/native_app_glue/android_native_app_glue.c)
target_include_directories(native_app_glue PUBLIC
    ${ANDROID_NDK}/sources/android/native_app_glue)

find_library(log-lib
    log)

set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -u ANativeActivity_onCreate")
add_library(helloworld-c SHARED
    src/main/cpp/helloworld-c.cpp)

target_link_libraries(helloworld-c
    android
    native_app_glue
    ${log-lib})

There's a typo on target_link_libraries. It should be native_app_glue instead of native_app_blue

Thanks! I originally used screencaptures for all my code snippets, and changed them to code at the last second for submission to the Android blog.