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?

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, ...

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.