title: How to get extras without a key?
body: <p>As is known to all, we can put the extra info into an Intent by using <code>putExtra/putExtras</code>, and pass it to another app. At the destination, we can use <code>getxxxExtra/getExtras</code> to get this information. However, all these methods request a key.</p>
  
  <p>I was wondering if there is any way to obtain information without a key.
  Or, is there any way to check all the keys that have been set into the bundle?</p>
  
  <p>Thanks in advance!</p>