title: How to check if file has been sent over Bluetooth successfully?
body: <p>I want to delete the file(.txt or .js) once the transfer has been complete.
  Bluetooth gives a Toast once the file has been transferred(or not)</p>
  
  <p>Is there any way to catch that Toast or to know when file transfer is 
  complete? Does Bluetooth fire an event or set a Flag? Please help, stuck for 3 days now.</p>