title: react-native: how to run an app on emulator in offline mode?
body: <p>When I switch my emulator of Android to Airplane Mode, the app i'm developing crashes because it needs the development server.</p>
  
  <p>I'm in need to test offline behaviour for my app, so I ask you how to work offline with an app into the emulator?</p>
  
  <p>GOAL: I must test what the app does when connection is not available. I'm asking if there is a way to test a reac-native app without connection, but without build a production version and installing, because I'm actively developing the off-line mode and I need to re-run the app houndreds of times</p>