How Simpler and Shorter Code of Kotlin Has Changed the Android Development Experience?

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How Simpler and Shorter Code of Kotlin Has
Changed the Android Development Experience?
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Intro

• At Google I/O 2017, the Android team had
  announced remarkable support for Kotlin, the
  statically typed programming language for the JVM
  (Java Virtual Machine).
• In fact, Kotlin has already become a buzz in
  the Android development for years, and the number
  of projects developed using Kotlin is
  consistently increasing at Github as well.
  However, this language was always in a very
  awkward position for Android developers because
  it had never been supported officially. But now,
  the status quo has changed.

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Kotlin Advantages

• Easy Learning Curve Advantage
• A concise statically-typed programming language
  that is extremely easy to read and write
• The modern and Android-compatible language that
  is especially designed to be type-and null-safe
• Much simpler and shorter code than Javas
  equivalent code
• Easy debugging due to more human-readability ease
• Playful yet much faster Android app development
  process

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• Open Source Advantage
• Kotlin has always been an Open Source project
  under Apache 2 and there is a strong possibility
  to move Kotlin into a non-profit foundation.
• Kotlin encourages a strong and company
  independent open developer ecosystem while
  growing the Android platform.

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• 100 Java Compatibility Advantage
• The level of interoperability between Java and
  Kotlin can be considered as one of the most
  powerful advantage
• The possibilities of perfect compilation of Java
  and Kotlin code co-existing in the same project
• You can use the majority of Java libraries and
  frameworks in Kotlin projects including advanced
  frameworks
• You can use Kotlin without taking any drastic
  steps like converting an entire project to
  Kotlin.

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How about IntelliJ IDEA, Eclipse or Netbeans?

• Android Studio is built on IntelliJ IDEA, an IDE
  built by JetBrainsthe same company behind the
  Kotlin language. The JetBrains team has ensured
  Kotlin works great with IntelliJ IDEA.
• Starting with Android Studio 3.0, tooling support
  for Kotlin is bundled directly into Android
  Studio. Kotlins target to be available on
  multiple platforms and support for other IDEs
  will continue as before.

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• What Happens to Existing Languages?
• Thought Kotlin has been declared official Android
  language, existing languages have also been
  empowered in the best possible way. 
• For example
• Android O supports Java 8 libraries
• C is intended to furnish better native
  experience and enhanced with expanding
  performance profiling tools and APK debugging
  tools

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Kotlin Vs Java Main feature Advantage

• Full Java Interoperability
• Kotlin is 100 interoperable with Java so you can
  utilize all existing Android libraries including
  annotation processing, so data binding and Dagger
  work in a Kotlin application.
• Hence, the java friendly Android developer can
  easily learn Kotlin and making it compatible with
  Android projects.
• Data Classes
• In the Java world, a typical data class has tons
  of boilerplate code that one needs to skip while
  finding out the real use of that class, such as
  the getters and setters. But in Kotlin, we can
  easily create a POJO (Plain Old Java Object) with
  getters, setters, equals(), hashCode(),
  toString() and copy() in a single lineFor
  instance, in Java, if we want to create a typical
  data class, well need to write (or at least
  generate) this code

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How much code is this on Kotlin? Just this
simple data class
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• Null safety
• When we develop the application using Java, most
  of our code is defensive. We need to keep
  checking continuously if something is null before
  we use it. Otherwise we may find unexpected
  NullPointerException. Kotlin, as many other
  languages, is null safe because we need to
  explicitly specify if an object can be null by
  using the safe call operator.

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We can do things like this
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Safe Calls with Kotlin

• Extension functions
• We can add new functions to any class. Its a
  much more readable substitute to the typical
  utility classes we all have in our projects. We
  could, for instance, add a new method to
  fragments to show a toast

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Extension functions

• We can add new functions to any class. Its a
  much more readable substitute to the typical
  utility classes we all have in our projects. We
  could, for instance, add a new method to
  fragments to show a toast

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We can do things like this with Kotlin
Functional support (Lambdas) What if instead of
having to write the creation of a new listener
every time we need to declare what a click should
do, we could just define what we want to do? We
can indeed. This (and many more interesting
things) is what we get thanks to lambda
usage
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• As a part of our exploration about how Kotlin
  actually works with the real world application,
  below are the Kotlin specimen codes we have
  created for our Hello World News application. The
  objective is to fetch data from server to mobile
  device and getting it displayed to UI in the
  desired format using Kotlin. The specimen codes
  are described in three different stages
• Code for fetching the list of data to mobile
  device from server
• Code for displaying that data to User Interface
• Code for data rendering using Recycler Adapter

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Fetching the list of data to mobile device
from server
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Displaying that data to User Interface
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For data rendering using Recycler Adapter
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• Original Source
• http//www.azilen.com/blog/kotlin-framework-for-an
  droid-development/

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