This opencv-mobile repo is what all you want.

OpenCV4Android

Repo about create your own opencv-android lib without install opencv manager apk.

Steps

• download opencv-2.4.13.2-android-sdk.zip
• create an android project and named OpenCV4Android
• create an android library and named opencv, edit Package name: org.opencv
• unzip opencv-2.4.13.2-android-sdk.zip, and copy all subfolders in OpenCV-android-sdk/sdk/java/src/org/opencv to android opencv library opencv/src/main/java/org/opencv
• do the following operate in android opencv library opencv/src/main/java/org/opencv/android:
  • delete AsyncServiceHelper.java
  • comment some code in OpenCVLoader.java

  //    public static boolean initAsync(String Version, Context AppContext,
  //            LoaderCallbackInterface Callback)
  //    {
  //        if (initDebug()) {
  //            Callback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
  //            return true;
  //        }
  //        Log.w(TAG, "OpenCV binaries are not packaged with application. Trying to use OpenCV Manager...");
  //        return AsyncServiceHelper.initOpenCV(Version, AppContext, Callback);
  //    }
  

• copy OpenCV-android-sdk/sdk/java/res/values/attrs.xml to android opencv library opencv/src/main/java/res/values/
• modify android opencv library file opencv/src/main/java/res/values/string.xml

  <resources>
  <string name="app_name">OpenCV-2.4.13.2</string>
  </resources>
  

• create jniLibs folder in android opencv library opencv/src/main
• copy what you need subfolder in OpenCV-android-sdk/sdk/native/libs to android opencv library opencv/src/main/jniLibs
• Import opencv library to app by the following:
  1. click File->Project Structure...
  2. click app under Modules category, and then click Dependencies on the right
  3. click + around Dependencies and choose 3 Module Dependency
  4. choose :opencv, and click OK, OK

Find the aar files

After you run the app, you should find the android opencv library aar files in opencv/build/outputs/aar, which like

opencv-debug.aar
opencv-release.aar

How to import the aar file

reference this

Result screenshot

Reference

opencv-android