Simple-Calculator/app/build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 27
    buildToolsVersion '27.0.2'

    defaultConfig {
        applicationId "com.simplemobiletools.calculator"
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 15
        versionName "3.0.1"
        setProperty("archivesBaseName", "calculator")

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

    signingConfigs {
        release
    }

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
        }
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        checkReleaseBuilds false
        abortOnError false
    }
}

dependencies {
    implementation 'com.simplemobiletools:commons:3.2.3'
    implementation 'me.grantland:autofittextview:0.2.1'

    testImplementation 'junit:junit:4.12'
    testImplementation 'org.robolectric:robolectric:3.5.1'

    androidTestImplementation 'com.android.support:support-annotations:27.0.2'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test:rules:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

Properties props = new Properties()
def propFile = new File('signing.properties')
if (propFile.canRead()) {
    props.load(new FileInputStream(propFile))

    if (props != null && props.containsKey('STORE_FILE') && props.containsKey('KEY_ALIAS') && props.containsKey('PASSWORD')) {
        android.signingConfigs.release.storeFile = file(props['STORE_FILE'])
        android.signingConfigs.release.storePassword = props['PASSWORD']
        android.signingConfigs.release.keyAlias = props['KEY_ALIAS']
        android.signingConfigs.release.keyPassword = props['PASSWORD']
    } else {
        println 'signing.properties found but some entries are missing'
        android.buildTypes.release.signingConfig = null
    }
} else {
    println 'signing.properties not found'
    android.buildTypes.release.signingConfig = null
}