opencv

Open Source Computer Vision Library https://opencv.org/

alexlyulkov 915e677866 Merge pull request #24884 from alexlyulkov:al/aar-add-kotlin Added kotlin classes to AAR #24884 The resulting maven repo doesn't have kotlin-plugin dependency, and it works fine out of the box: Android Kotlin projects already have kotlin-plugin dependency, Android Java projects ignore kotlin classes. Details on KGP versions: https://kotlinlang.org/docs/gradle-configure-project.html#apply-the-plugin ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [ ] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake Co-authored-by: Alexander Lyulkov <alexander.lyulkov@opencv.ai> Co-authored-by: Alexander Smorkalov <alexander.smorkalov@xperience.ai>		10 months ago
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OpenCV	Merge pull request #24884 from alexlyulkov:al/aar-add-kotlin	10 months ago
gradle/wrapper	AAR package build and test with CI	1 year ago
README.md	Merge pull request #24456 from alexlyulkov:al/aar	1 year ago
build.gradle	Merge pull request #24884 from alexlyulkov:al/aar-add-kotlin	10 months ago
gradle.properties	Merge pull request #24456 from alexlyulkov:al/aar	1 year ago
gradlew	Merge pull request #24456 from alexlyulkov:al/aar	1 year ago
gradlew.bat	Merge pull request #24456 from alexlyulkov:al/aar	1 year ago
settings.gradle	Merge pull request #24456 from alexlyulkov:al/aar	1 year ago

README.md

Scripts for creating an AAR package and a local Maven repository with OpenCV libraries for Android

How to run the scripts

Set JAVA_HOME and ANDROID_HOME enviroment variables. For example:

export JAVA_HOME=~/Android Studio/jbr
export ANDROID_HOME=~/Android/SDK

Download OpenCV SDK for Android
Run build script for version with Java and a shared C++ library:

python build_java_shared_aar.py "~/opencv-4.7.0-android-sdk/OpenCV-android-sdk"

Run build script for version with static C++ libraries:

python build_static_aar.py "~/opencv-4.7.0-android-sdk/OpenCV-android-sdk"

The AAR libraries and the local Maven repository will be created in the outputs directory

Technical details

The scripts consist of 5 steps:

Preparing Android AAR library project template
Adding Java code to the project. Adding C++ public headers for shared version to the project.
Compiling the project to build an AAR package
Adding C++ binary libraries to the AAR package. Adding C++ public headers for static version to the AAR package.
Creating Maven repository with the AAR package

There are a few minor limitations:

Due to the AAR design the Java + shared C++ AAR package contains duplicates of C++ binary libraries, but the final user's Android application contains only one library instance.
The compile definitions from cmake configs are skipped, but it shouldn't affect the library because the script uses precompiled C++ binaries from SDK.