title: How to handle the ActivityNotFoundException?
body: <p>In my app , I need to use startActivity to see the content of the file , or use the default application to open the certain file , but sometimes the android system may not install the application which is needed .</p>
  
  <p>My question is how to handle this exception . I want a toast , not FC..</p>
  
  <p>Any Advice? THX</p>