Missing android_main ?

[rbarara]

Thanks for pointing to install. After setting environment variables, I get the following error (seems like :
android_native_app_glue.c:233: error: undefined reference to 'android_main' is the issue).. Am I missing a library ?

Android NDK: android-9 is unsupported. Using minimum supported version android-14.
Android NDK: WARNING: APP_PLATFORM android-14 is higher than android:minSdkVersion 1 in src/main/AndroidManifest.xml. NDK binaries will not be comptible with devices older than android-14. See https://android.googlesource.com/platform/ndk/+/master/docs/user/common_problems.md for more information.
[armeabi] Prebuilt : libopencv_java3.so <= /Users/rajan/opencv/sdk//native/jni/../libs/armeabi/
[armeabi] Install : libopencv_java3.so => libs/armeabi/libopencv_java3.so
[armeabi] Compile++ thumb: visionpipeline <= crvimage.cpp
[armeabi] Compile++ thumb: visionpipeline <= timeutil.cpp
[armeabi] Compile++ thumb: visionpipeline <= normroi2.cpp
[armeabi] Compile++ thumb: visionpipeline <= facedetection.cpp
[armeabi] Compile++ thumb: visionpipeline <= visionpipeline.cpp
[armeabi] Compile++ thumb: visionpipeline <= visionpipeline_jni.cpp
[armeabi] Compile thumb : android_native_app_glue <= android_native_app_glue.c
[armeabi] StaticLibrary : libandroid_native_app_glue.a
[armeabi] SharedLibrary : libvisionpipeline.so

/Users/rajan/Library/Android/sdk/ndk-bundle/sources/android/native_app_glue/android_native_app_glue.c:233: error: undefined reference to 'android_main'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [src/main/obj/local/armeabi/libvisionpipeline.so] Error 1

:eviacam:ndkBuild FAILED

FAILURE: Build failed with an exception.

[cmauri]

Not sure why this happens it seems that compiles fine but fails at link time. Which NDK version are you using? In my case is android-ndk-r13b. Did you try to google the error?

Note that you just need to export one environment variable (OPENCV_ANDROID_SDK), and that such variable should be visible in Android Studio.

Finally, it seems you are on a Mac. It should work just fine, but I never tried to compile the project on a Mac.