title: What connection use emulator in android studio?
body: <p>Android studio has its own settings for connection. There I can use proxy. So this way studio will use that proxy instead of computer wifi connection to sync libraries for example. 
  But for example if my application I send requests to the firebase what connection will be used by emulator? It will use studio proxy or it will use computer wifi for that? And if I use real device will it use mobile internet connection or proxy?</p>