Hands-On Serverless Applications with Kotlin

The when() expression

In the app, the Firebase login screen has multiple views, such as TextView, Button, and so on. Each button has click event to consume. In Android, we usually implement a click listener and then check which button is clicked with the help of a switch case. The following is the way we have written a case to consume a click for each respective button in Kotlin:

override fun onClick(v: View) {    when (v.id) {        R.id.emailCreateAccountButton -> createAccount(edtEmailId.text.toString(), edtPassword.text.toString())        R.id.emailSignInButton -> signIn(edtEmailId.text.toString(), edtPassword.text.toString())        R.id.signOutButton -> signOut()        R.id.verifyEmailButton -> sendEmailVerification()    }}

Typically, this replaces the switch case ...