"Hello World" programs are pretty famous, even if all they do is write "Hello World!" on the screen. When learning a new programming language or platform, starting with such a simple program has become a tradition.
Hello World Toast is a standard Android app, that can be installed on any Android device, and started from the Apps or Home Screen. All it does is display the famous "Hello World!" text in a toast - the familiar Android small popup used to show quick messages to the user. Then the app closes, even before starting. That's it!
(However, Hello World Toast may be useful if you need to show someone how a real Android toast looks like.)
Hello World Toast runs on any Android smartphone, tablet, or device. It runs on the latest Android versions, and even on the oldest versions, starting with Android 1.0!