build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 21
    buildToolsVersion '25.0.0'

    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"


        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {
        main {
            aidl {
                srcDir 'src'
            }
            jni {
                srcDirs = []
            }
            jniLibs {
                srcDirs 'libs'
            }
        }
    }
/*
    sourceSets {
        main {
            java {
                srcDir 'src'
            }
            res {
                srcDir 'res'
            }
            assets {
                srcDir 'assets'
            }
            resources {
                srcDir 'src'
            }
            aidl {
                srcDir 'src'
            }
            jni {
                srcDirs = []
            }
            jniLibs {
                srcDirs 'libs'
            }
        }
    }
*/

    task ndkBuild(type: Exec, description: 'Compile JNI source via NDK') {
        commandLine ndkDir + "\\ndk-build.cmd",
                'NDK_PROJECT_PATH=build/intermediates/ndk',
                'NDK_LIBS_OUT=libs',
                'APP_BUILD_SCRIPT=src/main/jni/Android.mk',
                'NDK_APPLICATION_MK=src/main/jni/Application.mk',
                'OPEN-CV-SDK=' + OPEN_CV_SDK
    }

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

    defaultConfig {
        ndk {
            abiFilters "armeabi-v7a"
        }
    }

    externalNativeBuild {
        ndkBuild {
            path 'src/main/jni/Android.mk'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    testCompile 'junit:junit:4.12'
}