title: Stop a runnable in a separate Thread
body: <p>Hey there i currently have a problem with my android app. I´m starting an extra thread via 
  implementing the Excecutor Interface:</p>
  
  <pre><code>class Flasher implements Executor {
      Thread t;
     public void execute(Runnable r) {
       t = new Thread(r){
       };
       t.start();
     }
   }
  </code></pre>
  
  <p>I start my Runnable like this:</p>
  
  <pre><code>flasherThread.execute(flashRunnable);
  </code></pre>
  
  <p>but how can i stop it?</p>