How to include *.so library in Android Studio?

Current Solution

Create the folder project/app/src/main/jniLibs, and then put your *.so files within their abi folders in that location. E.g.,

project/
├──libs/
|  └── *.jar       <-- if your library has jar files, they go here
├──src/
   └── main/
       ├── AndroidManifest.xml
       ├── java/
       └── jniLibs/ 
           ├── arm64-v8a/                       <-- ARM 64bit
           │   └── yourlib.so
           ├── armeabi-v7a/                     <-- ARM 32bit
           │   └── yourlib.so
           └── x86/                             <-- Intel 32bit
               └── yourlib.so

Deprecated solution

Add both code snippets in your module gradle.build file as a dependency:

compile fileTree(dir: "$buildDir/native-libs", include: 'native-libs.jar')

How to create this custom jar:

task nativeLibsToJar(type: Jar, description: 'create a jar archive of the native libs') {
    destinationDir file("$buildDir/native-libs")
    baseName 'native-libs'
    from fileTree(dir: 'libs', include: '**/*.so')
    into 'lib/'
}

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

Same answer can also be found in related question: Include .so library in apk in android studio

Adding .so Library in Android Studio 1.0.2

1. Create Folder "jniLibs" inside "src/main/"
2. Put all your .so libraries inside "src/main/jniLibs" folder
3. Folder structure looks like,
   |--app:
   |--|--src:
   |--|--|--main
   |--|--|--|--jniLibs
   |--|--|--|--|--armeabi
   |--|--|--|--|--|--.so Files
   |--|--|--|--|--x86
   |--|--|--|--|--|--.so Files
   
4. No extra code requires just sync your project and run your application.
   
   Reference
   https://github.com/commonsguy/sqlcipher-gradle/tree/master/src/main

Solution 1 : Creation of a JniLibs folder

Create a folder called “jniLibs” into your app and the folders containing your *.so inside. The "jniLibs" folder needs to be created in the same folder as your "Java" or "Assets" folders.

Solution 2 : Modification of the build.gradle file

If you don’t want to create a new folder and keep your *.so files into the libs folder, it is possible !

In that case, just add your *.so files into the libs folder (please respect the same architecture as the solution 1 : libs/armeabi/.so for instance) and modify the build.gradle file of your app to add the source directory of the jniLibs.

sourceSets {
    main {
        jniLibs.srcDirs = ["libs"]
    }
}

You will have more explanations, with screenshots to help you here ( Step 6 ):

http://blog.guillaumeagis.eu/setup-andengine-with-android-studio/

EDIT It had to be jniLibs.srcDirs, not jni.srcDirs - edited the code. The directory can be a [relative] path that points outside of the project directory.