![]() A Kotlin map can be either mutable ( mutableMapOf) or read-only ( mapOf ). We can declare the keys and values to be any type there are no restrictions. ![]() The same value can be associated with multiple keys though. To use them you have to apply another plugin in your module adle file: apply plugin: 'kotlin-android-extensions'Ĭaveat: if you are using the Kotlin plugin action to set up your project, it will put the following code in your top level build. Kotlin map is a collection of key/value pairs, where each key is unique, and it can only be associated with one value. Remember, you can use it to convert any class, interface, enum or annotation, and this can be used to compare Java easily to Kotlin code.Īnother useful element that saves a lot of typing are Kotlin extensions. To add Kotlin support to a newly created or an existing project, open the find action dialog using Command + Shift + A on Mac or Ctrl + Shift + A on Windows/Linux, and invoke the Configure Kotlin in Project action.Īlternatively, you can create a Java class and convert it to Kotlin using the action mentioned above. To learn how to create a new Android project, check the official step by step guide. Add Kotlin support to an existing Android project.Create a new Android project and setup Kotlin in the project.After successfully doing so, new actions will be available for converting your Java to Kotlin. ![]() The first step is to install Kotlin plugin. Since Kotlin is developed by JetBrains, it is well-supported in both Android Studio and IntelliJ.
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