Building latest master for android but missing Java folder

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I'm trying to build the latest master for Android. I struggled for a while but finally got cmake, cygwin, NDK and SDK to all work together and compile. I built for shared libraries but I can't figure out why there's no java directory generated.

If I download 4.1 in the sdk directory I see: etc native java

Where java contains what looks like the wrapper for opencv as well as an android manifest file.

When I build master all I get are: etc native

So no java, and also only abi-armeabi-v7a, no abi-arm64-v8a (maybe that's the cross compile options?).

Also my cmake output under Java: says "Java wrappers: NO" It is finding my python installation which was a problem I saw in another post.

So I'm not sure how to get my java directory, and how to build for ARM-64 architecture.

Thank you

EDIT3-- Failing at build install

Configure project : Evaluating root project 'android_sdk' using build file 'D:\opencv_git\opencv\bui ld_android\modules\java\android_sdk\build.gradle'.

All projects evaluated.

FAILURE: Build failed with an exception.

• What went wrong: Project 'opencv' not found in root project 'android_sdk'.

• Try: Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 56s modules\java\android_sdk\CMakeFiles\opencv_java_android.dir\build.make:60: recip e for target '/opencv/build/outputs/aar/opencv-release.aar' failed mingw32-make[2]: * [/opencv/build/outputs/aar/opencv-release.aar] Error 1 CMakeFiles\Makefile2:2110: recipe for target 'modules/java/android_sdk/CMakeFile s/opencv_java_android.dir/all' failed mingw32-make[1]: [modules/java/android_sdk/CMakeFiles/opencv_java_android.di r/all] Error 2 Makefile:161: recipe for target 'all' failed mingw32-make: ** [all] Error 2

EDIT2-- Failing at protobuf This looks like it's because of the line modules/dnn/opencv-caffe.pb.h: ../modules/dnn/protobuf::protoc In dnn\CMakeFiles\opencv_dnn.dir\build.make

It doesn't like the ::. I tried escaping it but that only go me a little further. So I disabled it in cmake and moved on.

EDIT--- Cmake output

Detected processor: armv7-a
sizeof(void) = 4 on 64 bit processor. Assume 32-bit compilation mode
Looking for ccache - not found
OpenCV disables pkg-config to avoid using of host libraries. Consider using PKG_CONFIG_LIBDIR to specify target SYSROOT
libjpeg-turbo: VERSION = 2.0.2, BUILD = opencv-4.1.1-pre-libjpeg-turbo
Android: Projects builds are DISABLED
Excluding from source files list: modules/imgproc/src/corner.avx.cpp
Excluding from source files list: modules/imgproc/src/imgwarp.avx2.cpp
Excluding from source files list: modules/imgproc/src/imgwarp.sse4_1.cpp
Excluding from source files list: modules/imgproc/src/resize.avx2.cpp
Excluding from source files list: modules/imgproc/src/resize.sse4_1.cpp
Excluding from source files list: modules/imgproc/src/sumpixels.avx512_skx.cpp
Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': D:/opencv_git/opencv/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
opencv_dnn: filter out ocl4dnn source code
opencv_dnn: filter out cuda4dnn source code
Excluding from source files ...