IvanShafran

dependencies {
    testImplementation 'com.github.IvanShafran:shared-preferences-mock:1.0'
}

IvanShafran

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

IvanShafran

public class CounterPreferences {
    // ...
    private final SharedPreferences sharedPreferences;
    public CounterPreferences(@NonNull final Context context) {
        sharedPreferences = context.getSharedPreferences(FILENAME, Context.MODE_PRIVATE);
    }

    public int getCounter() {
        return sharedPreferences.getInt(KEY, 0);
    }

IvanShafran

...
apply from: 'signing.gradle'
...
android {
  ...
  buildTypes {
        release {
            signingConfig signingConfigs.release
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

IvanShafran

def propertiesFilename = "production.properties"
if (!project.file(propertiesFilename).exists()) {
    propertiesFilename = "contributors.properties"
}

def signingProperties = new Properties()
signingProperties.load(new FileInputStream(file(propertiesFilename)))

android {
    signingConfigs {

IvanShafran

# Sign key alias for contributors.jks
releaseSignKeyAlias=key
# Sign key password for contributors.jks
releaseSignKeyPassword=password
# Path to contributors.jks
releaseStoreFilePath=./contributors.jks
# Keystore password for contributors.jks
releaseStorePassword=password

IvanShafran

class Sample {
    companion object {
        init {
            DependencyChecker.check()
        }
    }
}

IvanShafran

public class DependencyChecker {
    public static void check() throws ClassNotFoundException {
        try {
            // Intrinsics exists in all std-lib versions
            Class.forName("kotlin.jvm.internal.Intrinsics");
        } catch (ClassNotFoundException e) {
            throw new ClassNotFoundException("Library depends on Kotlin std-lib.\n" +
                 "Add to dependencies: org.jetbrains.kotlin:kotlin-stdlib:1.3.31"
            );
        }

IvanShafran

class Sample {
    companion object {
        @JvmField
        val INSTANCE = Sample()
    }
}

IvanShafran

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
    kotlinOptions {
        apiVersion = "1.2"
        languageVersion = "1.2"
    }
}