title: How to run my code on the specific thread?
body: <p>How to run my code on the specific thread?</p>
  
  <p>If "the specific thread" is main ui Thread, I can do use runOnUiThread method.</p>
  
  <p>But "the specific thread" is not ui Thread and "the specific thread" is not made by me.</p>
  
  <p>"the specific thread" is made by some library.</p>
  
  <p>But I can access "the specific thread".</p>
  
  <p>Like this, <code>Thread theSpecificThread = getThread();</code></p>
  
  <p>How to run my code on the specific thread like runOnUiThread(new Runnable())?</p>