OpenCV Example

Based on OpenCV's Tutorial #1.

OpenCV installation

Based on this

Download latest OpenCV sdk for Android from OpenCV.org and decompress the zip file.
Import OpenCV to Android Studio, From File -> New -> Import Module, choose sdk/java folder in the unzipped opencv archive.
Update build.gradle under imported OpenCV module to update 4 fields to match your project build.gradle a) compileSdkVersion b) buildToolsVersion c) minSdkVersion and 4) targetSdkVersion.
Add module dependency by Application -> Module Settings, and select the Dependencies tab. Click + icon at bottom, choose Module Dependency and select the imported OpenCV module.
For Android Studio v1.2.2, to access to Module Settings : in the project view, right-click the dependent module -> Open Module Settings
Copy libs folder under sdk/native to Android Studio under app/src/main.
In Android Studio, rename the copied libs directory to jniLibs and we are done.

Download and install Android's Native Development Kit (NDK). More info here: https://developer.android.com/ndk/guides/setup.html

This project uses the gradle experimental plugin, so it is subject to change.

Your local.properties file must define the ndk and opencv dirs. Here's mine as an example

sdk.dir=~/Library/Android/sdk
ndk.dir=/usr/local/android-ndk-r10e
opencv.dir=~/dev/androidstudio/OpenCV-android-sdk/sdk/native/jni/include