Learn more about object-oriented programming in Kotlin with a look at abstract classes, interfaces, inheritance, and type aliases.

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Learn how to add default and static methods to your interfaces, create repeating annotations, and use lambda expressions and method references.

Learn some cool Kotlin class properties, such as late initialization, inline properties, and extension properties, as well as advanced Kotlin class types.

The RRO framework lets you create themes that change the look of almost every app on an Android device. Learn how to use it to edit the quick settings tray.

Lambda expressions can help you process huge amounts of data with ease. See how with this in-depth look at Java 8 features you can use in Android projects.

Android app templates are a huge time saver. We've combed through thousands of Android app templates available at CodeCanyon to find the 15 best available.

Get an introduction to object-oriented programming in Kotlin by learning about classes: constructors and properties, casting, and advanced class features.

We often need to pass data between Activities of an Android app. Learn how Parcelable makes it easy to serialize classes for sharing between Activities.

Use IBM Watson's natural language services to create an app that translates from one language to another and extracts sentiment, entities, and emotions.

Learn how to to achieve concurrency in RxJava with Schedulers, the subscribeOn() operator, the observeOn() operator, and the flatMap() operator.

Kotlin is a functional language, and in this post, you'll learn about extension functions, higher-order functions, closures, and inline functions in Kotlin.