Android Clickable On screen text

I was curious, I seen this app the other day that allowed it to open other apps and set certain functions up for you automatically. I have came to realize that it must be using an on screen click function of some sort, but I can't seem to find any documentation for something like this. For example if we know the on screen text from the other app is "Ready", is there a way to read that text and maybe do something like:

protected void processText(String text)
{
  if (text.contains("Ready"))
      // click the ready text
}