Java to Kotlin migration is rapidly growing for Android apps as it is the best procedural language

Kotlin, a new programming language, is taking over traditional app development programming languages. Ever since Google made the announcement of adding Kotlin as an official Android app development language hence, providing a ton of support to the Kotlin community. So, is it worth performing Java to Kotlin migration on your Android application?

In this article, we will be answering this migration question while also covering many different aspects of what exactly happens in the process of migrating an Android app based on java to Kotlin. At present, a significant amount of mobile app developers think of Kotlin as the first viable alternative to the Java programming language for Android platforms.

In this case, you are still new in the field of android app development and haven’t heard much about Kotlin. Then we would highly recommend you to get your basics cleared with the help of this article on ‘Basic Syntax.’

The programming language Kotlin can be referred to as a modern open-source JVM language that was developed by JetBrains. Some of the huge organizations that are currently using Kotlin language are Trello, Google, Square, Pinterest, Kickstarter etc. 

Need for Java To Kotlin Migration

For the Android development platform, Kotlin delivers an impressive modern programming experience without the need for involving any third-party software. When an app developer is involved with any third-party tool.platform, there’s always a risk of including those Java features that are not supported by Android toolchain. 

Although programming languages like Java and Kotlin are similar in some context, but they are still worlds apart. For instance, Kotlin is highly interoperable with all the existing Android languages. And it can also be easily integrated with Android Studio, which no other language can except Java. You can learn more about this on ‘Why Kotlin Is Preferred Language For Android Development?’

Initiating Java To Kotlin Migration Process

To start the java to Kotlin migration process, a majority of people first begin from their tests and then move on towards their modules. But this is not a hard and fast rule that is meant to be followed, the android app developer can directly select any random Java file that he/she wants to convert to Kotlin. 

Here are the main steps to convert Java to Kotlin:

  1. Start to convert files, one by one, via “⌥⇧⌘K”, make sure tests still pass.
  2. Move over to the Kotlin files and make them more idiomatic.
  3. Repeat the step 2 until you convert all the Java files.

Below are the common issues faced while converting Android App from Java to Kotlin converter:

  • The companion will add an extra layer.
  • There are no argument captors.
  • If the Java method starts with getX(), converter looks for a property with the name X.
  • ‘git diff’ issue is caused when two android app developers are working on the same Java file and one of them converts it to Kotlin, it will require rework.
  • Generics are difficult to get it right during the first time.
  • TypeCasting will occur due to Interoperability.


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