title: How to create Android text to speech application that says "hello world" without using text field to write the text?
body: <p>I am making a simple application where when the user clicks on the button, background voice says "hello world".  I have gone through tutorials but their problem is they all use text field to write the text by the user and then it is executed by the button. But what I want is the user to simply click on the button and voice should say "hello world". </p>