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Kotlin-Android-Boilerplate

An MVVM Boilerplate Android project written in Kotlin. This sample application fetches the top starred Kotlin repositories from Github and displays them. Inspired by @hitherejoe's Android-Boilerplate project.

Note: This project was developed before Google's introduction of Android Architecture Components at I/O 2017. I strongly encourage that you read their application architecture guide.

Screenshots

Libraries

• Dagger 2
• RxJava 2 and RxAndroid
• Retrofit 2
• Picasso
• Google Support Libraries

Testing Libraries

• JUnit
• Mockito

Requirements

To compile and run the project you'll need:

• Android SDK
• Android N (API 25)
• Android SDK Tools
• Android SDK Build Tools 24.0.3
• Android Support Repository
• Kotlin 1.0.6
• Kotlin plugin for Android Studio

Building

To build, install and run a debug version, run this from the root of the project:

./gradlew assembleDebug

Testing

To run unit tests on your machine:

./gradlew test

To run instrumentation tests on connected devices:

./gradlew connectedAndroidTest

Release Builds

A release build needs to be signed with an Android Keystore. The easiest way to generate a keystore is to open Android Studio and go to Build -> Generate Signed Apk -> Create New... After that you need to create a signing.properties file in the root directory and add the following info to it:

STORE_FILE=/path/to/your.keystore
STORE_PASSWORD=yourkeystorepass
KEY_ALIAS=projectkeyalias
KEY_PASSWORD=keyaliaspassword

Running ./gradlew assembleRelease will then build and sign a release version of the app.

FAQ

Why Kotlin?

In a nutshell, Kotlin throws all the bad parts of Java out the window and brings lots of great features from Java 8 and functional programming (Yet still compiling to Java 6 bytecode). Kotlin brings much needed language features to Android which is stuck on Java 6.

What is with all the interfaces?

By default Kotlin classes are closed (final). This makes them hard to mock unless you use a tool like Powermock. I'd rather just mock interfaces with Mockito than go through the hassle of using Powermock.

Update: Mockito 2.0 Supports mocking static and final out of the box. Thus, it removes the need for all of these interfaces.

How do I use this project?

This is a boilerplate project aimed to help bootstrap new Kotlin applications. Feel free to fork this application or use this project generator. Don't forget to change the following things for your application:

• Application ID (Gradle)
• Application Name (String resource)
• Package names

Attributions

• Kotlin Logo
• Github Icons