I updated Android Studio to latest SDK and NDK, and tried to build the Android tutorials, as well as the gst-examples with Android Studio on mac. I tried this with both the 1.14.2 and 1.14.3 SDK package. With the latest NDK (18.0.5002713) every attempt to build results in the following error:

Build command failed.
Error while executing process /Users/<username>/Library/Android/sdk/ndk-bundle/ndk-build with arguments {NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=/Users/<path to project>/android/app/src/main/jni/Android.mk NDK_APPLICATION_MK=/Users/<path to project>/android/app/src/main/jni/Application.mk APP_ABI=x86 NDK_ALL_ABIS=x86 NDK_DEBUG=1 APP_PLATFORM=android-23 NDK_OUT=/Users/<path to project>/android/app/build/intermediates/ndkBuild/safekeep/debug/obj NDK_LIBS_OUT=/Users/<path to project>/android/app/build/intermediates/ndkBuild/safekeep/debug/lib NDK_APPLICATION_MK=src/main/jni/Application.mk GSTREAMER_JAVA_SRC_DIR=src/main/java GSTREAMER_ROOT_ANDROID=/Users/<path to android sdk>/gstreamer-1.0-android-universal-1.14.2 GSTREAMER_ASSETS_DIR=src/main/assets /Users/<path to project>/android/app/build/intermediates/ndkBuild/<targetname>/debug/obj/local/x86/libgstvideoplayer.so}
[x86] Compile        : gstvideoplayer <= GstBackend.c
GStreamer      : [GEN] => gst-build-x86/gstreamer_android.c
GStreamer      : [COMPILE] => gst-build-x86/gstreamer_android.c
clang: error: argument unused during compilation: ‘--gcc-toolchain=/Users/<username>/Library/Android/sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/darwin-x86_64’ [-Werror,-Wunused-command-line-argument]
make: *** [gst-build-x86/gstreamer_android.o] Error 1

With NDK (17.2.4988734) the builds succeed as expected. Since you're recommending in your documentation to update to the latest NDK, I believe this should be addressed.