How do you display a Toast using Kotlin on Android?

Question

In different Kotlin examples for Android I see toast("Some message...") or toastLong("Some long message"). For example:

Answer 1

Try this

In Activity

Toast.makeText(applicationContext, "Test", Toast.LENGTH_LONG).show()

or

Toast.makeText(this@MainActiivty, "Test", Toast.LENGTH_LONG).show()

In Fragment

Toast.makeText(activity, "Test", Toast.LENGTH_LONG).show()

or

Toast.makeText(activity?.applicationContext, "Test", Toast.LENGTH_LONG).show()

Answer 2

It's actually a part of Anko, an extension for Kotlin. Syntax is as follows:

toast("Hi there!")
toast(R.string.message)
longToast("Wow, such a duration")

In your app-level build.gradle, add implementation "org.jetbrains.anko:anko-common:0.8.3"

Add import org.jetbrains.anko.toast to your Activity.

Answer 3

Show a Toast not from the UI Thread, in a Fragment

activity?.runOnUiThread {
        Toast.makeText(context, "Image saved to the Gallery", Toast.LENGTH_SHORT).show()
    }

Answer 4

This is one line solution in Kotlin:

Toast.makeText(this@MainActivity, "Its toast!", Toast.LENGTH_SHORT).show()

Answer 5

Custom Toast with Background color Text size AND NO XML file inflated Try the code without setting the Background color

    fun theTOAST(){

    val toast = Toast.makeText(this@MainActivity, "Use View Person List",Toast.LENGTH_LONG)
    val view = toast.view
    view.setBackgroundColor(Color.TRANSPARENT)
    val text = view.findViewById(android.R.id.message) as TextView
    text.setTextColor(Color.BLUE)
    text.textSize = (18F)
    toast.show()
}

Answer 6

If you don't want to use anko and want to create your own Toast extension. You can create inline(or without inline) extensions defined in a kotlin file(with no class) and with that you can access this function in any class.

inline fun Context.toast(message:String){
   Toast.makeText(this, message , duration).show()
}

Usage:

In Activity,

toast("Toast Message")

In Fragment,

context?.toast("Toast Message")