title: sendKeyDownUpSync doesn't work correctly
body: <p>I've got some problem with <strong>sendKeyDownUpSync</strong>. I want to use it in my widget to control inbuilt music player. It works almost correctly. Almost because when i call function:</p>
  
  <pre><code>public void previousTruck()
      {
          final Instrumentation inst = new Instrumentation();
          new Thread(new Runnable() {         
              public void run() { 
                     new Instrumentation().sendKeyDownUpSync(KeyEvent.KEYCODE_MEDIA_PREVIOUS);
  
          }).start();     
      }
  </code></pre>
  
  <p>It start changing music from my playlist but lots of time, why?
  I want to make only one "step" to next song from play list.</p>