title: Bundle extra = data.getExtras() get nothing after using camera takes photo
body: <p>I'm new to Android developing and following the training course on google now, I meet a problem. After executing Bundle <code>extra = data.getExtras()</code>, extra is null. Also it will throw a nullpointerexception before I add the code <code>"if(extra!=null)"</code>
  Here is the code of onActivityResult() method</p>
  
  <p><a href="https://i.stack.imgur.com/H8jGy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/H8jGy.png" alt="enter image description here"></a></p>
  
  <p>Here is the code part to start the camera and save photo locally</p>
  
  <p><a href="https://i.stack.imgur.com/r03qq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/r03qq.png" alt="enter image description here"></a></p>
  
  <p>All my code follows the training course and I am confused where is wrong. 
  Can someone help me?</p>