package so files for android module when building with gradle

gradle_package_so_files

    // requires gradleAfter from [gradle_after](https://gist.github.com/Jween/039f4625b69d598b856d) ahead

    //
    // for packaging so files in command line
    // invoke hint:
    //        > gradle -p someModule -P [unpackageSo=ture|false]
    // -unpackageSo optional, false by default, to package apk with so files inside
    //              if set to true, the package task will skip packaging so files into apk file
    //
    if (gradleAfter(1.12) ) {
        tasks.withType(com.android.build.gradle.tasks.PackageApplication) { pkgTask ->
            def unpackageSo = 'true' == project.properties.get('unpackageSo')

            if (unpackageSo) {
                println "So files is not packaged due to project property: 'unpackageSo' is true"
                android.sourceSets.main.jniLibs.srcDirs = []
            } else {
                println "Start setting up environment for packaging so files "
                android.sourceSets.main.jniLibs.srcDirs =
                        android.sourceSets.main.jniLibs.srcDirs << ['libs']
            }
        }
    } else {
        task copyNativeLibs(type: Copy) {
            from fileTree(dir: 'libs', include: '**/*.so') into 'build/libs'
        }

        //@Deprecated Compile class is deprecated in android gradle plugin 0.13.+ / gradle 2.1
        tasks.withType(Compile) { compileTask -> compileTask.dependsOn copyNativeLibs }

        clean.dependsOn 'cleanCopyNativeLibs'

        tasks.withType(com.android.build.gradle.tasks.PackageApplication) { pkgTask ->
            def unpackageSo = 'true' == project.properties.get('unpackageSo')

            if (gradleAfter(1.8)) {
                if (unpackageSo) {
                    println "So files is not packaged due to project property: 'unpackageSo' is true"
                    android.sourceSets.main.jniLibs.srcDirs = []
                } else {
                    println "Start setting up environment for packaging so files "
                    android.sourceSets.main.jniLibs.srcDirs =
                            android.sourceSets.main.jniLibs.srcDirs << ['libs']
                }
            } else {
                if (unpackageSo) {
                    println "So files is not packaged due to project property: 'unpackageSo' is true"
                    return;
                }

                println "Start setting up environment for packaging so files "
                def jni;
                if (pkgTask.metaClass.hasProperty(pkgTask, 'jniDir')) {
                    jni = "jniDir"
                    // pkgTask.jniDir file('build/libs')
                    pkgTask."${jni}" file('build/libs')
                } else if (pkgTask.metaClass.hasProperty(pkgTask, 'jniFolders')) {
                    jni = 'jniFolders'
                    // pkgTask.jniFolders = new HashSet<File>()
                    // pkgTask.jniFolders.add(new File(projectDir, 'native-libs'))
                    pkgTask."${jni}" = new HashSet<File>()
                    pkgTask."${jni}".add(new File(projectDir, 'build/libs'))
                } else {
                    return
                }
            }
        }
    }