title: Alert dialog shown but not visible
body: <p>I have an activity where I start the built-in camera using onActivityResult. After taking a picture, I go back to my application and show a pop up asking to the user if he wants to take more pictures or no. It works fine, but after taking the picture, when I press the "save" button on the built-in camera app, and inmediatly I press the home button, If I go back to my application, my activity is visible but not active and the popup that should be visible is there but I cannot see it. If I press the back button and cancel the pop up, my activity is active again, but I dont want to allow the user cancelling the pop up, so when this behavior occurs, I cannot use my app, I just have to kill it...</p>
  
  <p>The question is, how can I force to the dialog being always on the top if it is shown? Cause seems like it is behind the activity, waiting for the user to interact with it...</p>
  
  <p>Thanks!</p>