steveliles / opencv-android

Android Library Project for OpenCV (currently v3.x.y)

opencv-android

OpenCV4Android, packaged as a .aar for direct use without depending on the stupid OpenCV Manager app.

Building an .aar of OpenCV-3.x.y for yourself

Building OpenCV-3.x.y for Android is actually quite simple, its just not obvious where to get the pieces and the OpenCV docs hard-sell the "OpenCV Manager" in favour of the better and easier direct integration approach.

Here's the steps I used to create my .aar:

1. Download and extract the OpenCV4Android bundle
2. Create a Library Project in Android Studio
3. Copy the java source files from OpenCV4Android into src/main/java
4. Drop the OpenCV native libraries into src/main/jniLibs
5. Run the gradle build
6. Et voila, .aar file

Using your glorious new .aar

Reference the maven repository you've deployed your .aar to, e.g. mine (which I can't stop you from using ;)) is:

allprojects {
  repositories {
    jcenter()
    maven {
       url  "http://dl.bintray.com/steveliles/maven" 
    }
  }
}

Include the .aar in your build.gradle file:

dependencies {
  compile 'org.opencv:OpenCV-Android:3.1.0'
}

Bootstrap OpenCV in your Java code:

import org.opencv.android.OpenCVLoader;

...

if (OpenCVLoader.initDebug()) {
  // do some opencv stuff
}

Optional but recommended: to keep the downloaded APK size to a minimum, build separate APK's per architecture (approx 10MB each vs 42MB for universal) by placing the following inside the 'android' gradle directive of your application's build.gradle:

splits {
  abi {
    enable true
    reset()
    include 'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'mips', 'mips64', 'arm64-v8a'
    universalApk false
  }
}

Disclaimer: This project is simply my bundling of OpenCV as an Android Library. I am not otherwise involved in the OpenCV project, and all credit for the wonderful OpenCV library goes to the developers thereof.

opencv-android's Issues

java.lang.UnsatisfiedLinkError: No implementation found for java.lang.String org.opencv.core.Core.getBuildInformation_0()

OpenCVLoader.initDebug() return error:
java.lang.UnsatisfiedLinkError: No implementation found for java.lang.String org.opencv.core.Core.getBuildInformation_0()

I'm using Android Studio 3.4 version

Getting forbidden for http://dl.bintray.com/steveliles/maven

Hi Steve,
I am getting 403 forbidden error while trying to integrate your library in my app. Earlier It was working fine but now throwing below error. Please provide some solution so that i could use this library in my app.
Could not GET 'http://dl.bintray.com/steveliles/maven/org/opencv/OpenCV-Android/3.1.0/OpenCV-Android-3.1.0.pom'. Received status code 403 from server.

Can anyone explain how to use this code ? Still figuring

Can anyone explain how to use this code ? Still figuring.. Any genius who explain better and put the things what people want

OpenCV 3.2.0

3.2.0 is out, so may be worth packaging.

How to build OpenCV3.2.0 aar file ?

Hi, steveliles.

I followed your steps for building an OpenCV4Android aar file!

1. Fire up Android Studio and create a Library Project
2. Copy the java sources from the OpenCV4Android bundle into src/main/java in your library project
3. Copy the native library directories from the OpenCV4Android bundle into src/main/jniLibs
4. Build the .aar

Could you help me out ?

Can't find download link of release aar file

Thanks a lot for your awesome job about building OpenCV aar file. I found your blog at http://steveliles.github.io/building_opencv_as_an_aar_for_android.html and bintray https://bintray.com/steveliles/maven/OpenCV-Android/3.1.0.
But, I find No direct downloads selected for this package at the bottom of https://bintray.com/steveliles/maven/OpenCV-Android/3.1.0.
And in this repo, I'm not find any release version for your opencv-android. Could you please put download link for opencv-android ?

How to use the native dependency using this library?

I've been try use it using java class, and it works properly but how to include the native dependency using cmake?