To run on your device you will need to:
  1. Enable Developer options on android. How to enable developer options.
  2. Enable USB debugging/wireless debugging in the Developer option
  3. Connect your phone with Android Studio.
With that everything is configured, it’s time to run your Flutter app on your Android Device. Make sure your device is still connected and unlocked. Then, in your terminal, run: 
flutter run lib/main.dart
Congratulations, you have successfully completed the Android setup for your Flutter app!