In different Kotlin examples for Android I see toast("Some message...")
or toastLong("Some long message")
. For example:
view.setOnClickListener { toast("Click") }
As I understand, it is an Extension Function for Activity
.
How and where do you define this toast()
function so that you are able to use it throughout the project?
It can be an extension function for Context
:
fun Context.toast(message: CharSequence) =
Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
You can place this anywhere in your project, where exactly is up to you. For example, you can define a file mypackage.util.ContextExtensions.kt
and put it there as a top level function.
Whenever you have access to a Context
instance, you can import this function and use it:
import mypackage.util.ContextExtensions.toast
fun myFun(context: Context) {
context.toast("Hello world!")
}
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