Challenge: Polishing Your App Some More
You may notice that when you submit a query there is a bit of a lag before the RecyclerView starts to refresh. For this challenge, make the response to the user’s query submission feel more immediate. As soon as a query is submitted, hide the soft keyboard and collapse the SearchView.
As an extra challenge, clear the contents of the RecyclerView and display a loading indicator (indeterminate progress bar) as soon as a query is submitted. Get rid of the loading indicator once the JSON data has been fully downloaded. In other words, the loading indicator should not show once your code moves on to downloading individual images.