Android Java Project Converts to Kotlin in Android Studio

Question

I want to convert my java project to Kotlin, there are more than 500 java files. How can I convert it into Kotlin easily?

I know that we can convert one by one java file to Kotlin, But there are many files.

Can I convert it at once?

Guenon

You can convert it all at once, BUT don't expect it to compile immediately :D – Fuld

Try to keep old file and add Kotlin for new files only, 500 files to convert ... Good luck – Jochbed

So the transition from Java to Kotlin is seamless but not straightforward if the project is complex – Claudy

I tried for my app ... that has alot of files/classes. Converter ran for a while and then just disappeared. No feedback :( – Gallicize

Answer 1

You can definitely try. You just need to select a module or a folder in the Project navigator and select Code --> Convert Java file to Kotlin file:

You, though, need to keep in mind that the conversion is not perfect. For instance, Android Studio will have to guess whether a whole lot of properties are nullable or not. It will not get them all right... you will get a lot of crashes.

My suggestion would be to batch files in sensible chunks, so you can fix those Kotlinized files without getting swamped with errors.

Note: after converting a file to Kotlin you still will need to review it. A lot of things will be kept in Java for the sake of safety, but now that you have Kotlin you can use collection extensions, default constructor parameters, ...

Heloise

WHY MY ANDROID STUDIO DOESNT HAVE THE Convert Java file to Kotlin file – Latashalatashia

@VasantRaval Shouting... Did you buy a refurbished version? It might be faulty? – Heloise

I can able to to convert my entire project at once so I have convert every individual file – Latashalatashia

Answer 2

1. Select your app folder and go to Code Convert Java File to Kotlin File

2. Then after you convert the file,it says kotlin not configured.Click the Configure text then select the type of module you want to apply kotlin and it comes with the latest kotlin version press ok

N.B After you convert the code,you must convert some parameters that the compiler found it as a warning or error message.

Autochthon

Answer 3

It's easy, android-studio will do most of the work for you. To convert the existing javacode into kotlin, simply select the src/main/java folder in the project and choose Code->“Convert Java File to Kotlin File”. Android studio will then try as best as it can to convert all your java-code to kotlin-code.

Lamellicorn