title: Determining if an Activity exists on the current device?
body: <p>Is there a way to check and see if an Activity exists on your device? If I have a youtube video link I want to specify it open in the YouTube PlayerActivity. However, I don't want to crash if for some reason they don't have it.</p>
  
  <p>Is there a way to check and see if the activity exists? I don't think I can catch the runtime exception since startActivity() doesn't throw it.</p>