Android ndk stl support1/5/2024 ![]() Next you should create an output directory (inside of the directory where you've cloned OpenCV into) because OpenCV doesn't allow in-source builds mkdir android_build It might not be a requirement, but I only had good results cross-compiling on the Linux platform.įirst thing you need to do is downloading the sources git clone opencv I cross-compiled the sources on Ubuntu 16. The main requirements for building OpenCV from source is to have the NDK and CMake installed on your machine. It allows you to connect 2 Android devices through USB OTG and perform many of the tasks that are normally only accessible from a developer machine via ADB directly from your Android phone/tablet. If you you're an Android enthusiast that likes to learn more about Android internals, I highly recommend to check out my Bugjaeger app. In this post I'll describe my experience on building and using OpenCV on Android. I still prefer when the user doesn't have to download and install something additional besides my app, so I decided to use OpenCV without OpenCVManager. With OpenCVManager you have the advantage that multiple apps can use one library to save space and you also get automatic updates with bugfixes. ![]() Therefore I decided to only use the native C++ part of OpenCV and did not build the Java wrapper.Īdditionally, OpenCV on Android is usually used with OpenCVManager. Here I prefer to create my own wrapper that accesses only the minimal functionality I need. Libraries written in C++ often provide a JNI wrapper to access all possible APIs from Java/Kotlin code. But I did have some specific requirements that forced me to use OpenCV in my Android app in a bit different way than usual.Īs with most open source projects, I prefer to build the libraries from source, instead of downloading any prebuild binaries. There's a lot of documentation and tutorials that show how to use OpenCV on Android. Recently I found some free time and created my Pano Stitch & Crop app which uses OpenCV to create panoramic photos. I like to play with images and graphics stuff and OpenCV offers a lot of features related to image processing. Cross-compiling OpenCV from sources and using it in my Android apps has long time been on my todo list.
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