Android Development with Kotlin

Using Kotlin in a new Android project

For new Kotlin projects created in Android Studio 3.x, the main activity will be already defined in Kotlin, so that we can start writing Kotlin code right away:

Adding a new Kotlin file is similar to adding a Java file. Simply right-click on a package and select new | Kotlin File/Class:

The reason why the IDE says Kotlin File/Class and not simply Kotlin class, which is analogous to Java class, is that we can have more members defined inside a single file. We will discuss this in more detail in Chapter 2 ...