title: Send data from Activity to Fragment already created
body: <p>I only have found information about how to create a Fragment sending some data to it, but only in its instantiation with the constructor.</p>
  
  <p>But I want to know if it is possible to send some data (for instance, two Double objects) to a Fragment from an Activity without having to create a new instance of the Fragment.</p>
  
  <p>A Fragment that has been previously created.</p>