Android emulator :
https://www.genymotion.com/#!/
Test app (mediabrix-test.apk)
https://www.dropbox.com/s/0691asti0ghf2zf/mediabrix-test.apk?dl=0
Charles Proxy :
http://www.charlesproxy.com/
Using Charles with genymotion:
http://rexstjohn.com/using-genymotion-charles-proxy/
Sandboxes
Creative_Mobile_Sandbox/Robert_Rally
https://platform.mediabrix.com/#/campaigns/orders/preview/3422/lineitem/3359/flight/16248
Creative_Mobile_Sandbox/Robert_Reward
https://platform.mediabrix.com/#/campaigns/orders/preview/3422/lineitem/3605
Creative_Mobile_Sandbox/Robert_Rescue
https://platform.mediabrix.com/#/campaigns/orders/preview/3422/lineitem/3360/flight/16252