.py files are used to build multi-arch Android SDK package.

You can try to start from using this package itself (it includes current state of samples):

opencv-4.0.1-android-sdk.zip from https://github.com/opencv/opencv/releases/tag/4.0.1
open OpenCV-android-sdk/samples in Android Studio

Using OpenCV for Android from sources:

Setup environment variables to your Android SDK and NDK, something like that:

ANDROID_HOME="/opt/android/android-sdk.studio"
ANDROID_NDK_HOME="/opt/android/android-sdk.studio/ndk-bundle"

Install ninja-build (you can try to remove -GNinja CMake option if you don't have this tool - but this mode is not tested)

Gradle project is generated via CMake (run in clean "build folder"):

cmake -GNinja -DCMAKE_TOOLCHAIN_FILE=${ANDROID_NDK_HOME}/build/cmake/android.toolchain.cmake -DANDROID_ABI="armeabi-v7a with NEON" <opencv_src_path>

Specify "ANDROID_ABI" to arch of your test device (emulator may not work) - you may check ndk-18.config.py for correct values and/or extra options.

Finally, CMake output should contain these lines:

--   Android NDK:                   /opt/android/android-sdk.studio/ndk-bundle (ver 18.1.5063045)
--     Android ABI:                 armeabi-v7a
--     NDK toolchain:               arm-linux-androideabi-clang
--     STL type:                    c++_static
--     Native API level:            16
--   Android SDK:                   /opt/android/android-sdk.studio (tools: 26.1.1 build tools: 28.0.3)

Build JNI:

cmake --build . --target opencv_java

Generated Gradle project is located in: opencv_android (open this directory in Android Studio).

Uh oh!

Android: update samples (camera permissions) #13514

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