project is part of https://in.udacity.com/course/android-developer-nanodegree-by-google--nd801/
first get key from : https://www.themoviedb.org/documentation/api
then add your key in API_KEY = "?api_key="+"*ADD KEY"; (in MainActivity class line number 60)
How to:
gridview fetch Movie data using themoviedb API download image using https://github.com/bumptech/glide api
when click on movie it start new activity that contain depth infomation about movie.