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OpenCV 3.3.1 Android SDK with contrib modules

The official build doesn't provide contrib modules. This build includes all the opencv-contrib modules.

Download

Go to ./OpenCV-android-sdk, just like the offical SDK, all are there including contrib modules.

For someone who are curious about the generated JNI code, go to ./o4a or other build intermediate directories.

How to build yourself

Please refer to https://chao.yang.to/post/build-opencv-android-sdk/

How to Use in your Android project

import into existing project

  • In Android Studio, File -> New -> Import Module.., select OpenCV-android-sdk/sdk/java, then a new library module will be imported.

  • Copy the pre-compiled libs in OpenCV-android-sdk/sdk/native/libs into jniLibs of your Android studio module.

Avoid installing OpenCV Manager

If you don't want to install OpenCV Manager, you need to embed openCV library into your App.

New a subclass of android.app.Application class, in this class, put this line:

static {
    if (!OpenCVLoader.initDebug()) {
        Log.e(TAG, "Cannot load OpenCV library");
    }
}

Don't use OpenCVLoader.initAsync(..). That's it.

Filter out specific CPU architecture

If you want to keep your release App slim and only support some architectures, add this line into your module's build.gradle:

externalNativeBuild {
    cmake {
        abiFilters 'armeabi-v7a', 'arm64-v8a' //'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'arm64-v8a', 'mips', 'mips64'
    }
}

The last

Thanks to OpenCV, recently I developed an App sucessfully.