Can not run the java file sample in android studio, any one can help me? thx : I just download the sample file in android developers site(https://developer.android.com/training/multiscreen/index.html), then open this using android studio. 

But I found the run button is disable and I can't find any way to execute this.(just like this http://chuantu.biz/t5/34/1474269694x3394677986.jpg)

Any one can tall me how to run this file in android developers?Thank so much