Android opencv and NDK in android studio

Question

I want to utilize openCV in an android app that I'm creating but I do not know how to set up the NDK and openCV in android studio. I also want to be able to upload my project to github so it can be imported and worked on by others. Could someone please explain how I can install the NDK into android studio and include openCV for android (also, will I have to change my .gitignore file).

Answer 1

for OpenCV you can't yet directly use the Android Studio default way to call the NDK.

But you can integrate all your code and OpenCV like you would do for an eclipse project, and configure gradle to call ndk-build manually on your Android.mk file and integrating your .so files.

Here is how you can do this, from your build.gradle file:

import org.apache.tools.ant.taskdefs.condition.Os
...

android {
  ...

  sourceSets.main {
      jniLibs.srcDir 'src/main/libs' // use libs directory to get .so files, instead of jniLibs
      jni.srcDirs = [] //disable automatic ndk-build call
  }

  // call regular ndk-build(.cmd) script from app directory
  task ndkBuild(type: Exec) {
      if (Os.isFamily(Os.FAMILY_WINDOWS)) {
          commandLine 'ndk-build.cmd', '-C', file('src/main').absolutePath
      } else {
          commandLine 'ndk-build', '-C', file('src/main').absolutePath
      }
  }

  tasks.withType(JavaCompile) {
      compileTask -> compileTask.dependsOn ndkBuild
  }
}