Android : mealspotting android app from Parse not working

I have downloaded MealSpotting android code from Parse.com. I have created MealSpotting android app using the downloaded code in android studio with all files intact. After launching the app in mobile(Nexus5) its not showing anything expect the blank white screen, Logcat in studio is also not showing anything(no errors, no warnings).

I have added application id and client key in MealSpottingApplication class. Is there anything that I am missing here?

Please help me.