title: How to let a thread communicate with another activity thread
body: <p>i'm beginning to learn android, i meet a problem in my project,   </p>
  
  <p>in my application,i create a background thread which get data from remote server by UDP,<br>
  in this thread ,i will  parse the data  and distribute the message to different activity to process, so i don't know weather is there a mechanism to handle this problem.  </p>
  
  <p>thanks for your answer </p>