Include native lib in gradle

build.gradle

task copyNativeLibs(type: Copy) {
    from fileTree(dir: 'jni', include: '**/*.so' )  into  'build/native-libs'
}
tasks.withType(Compile) { compileTask -> compileTask.dependsOn copyNativeLibs }

clean.dependsOn 'cleanCopyNativeLibs'

tasks.withType(com.android.build.gradle.tasks.PackageApplication) { pkgTask ->
    pkgTask.jniDir file('build/native-libs')
}