To run an example, switch to that example's directory, and use flutter run. Make sure you have an emulator running, or a device connected over USB and debugging enabled on that device.

• cd examples/hello_world
• flutter run

You can also specify a particular Dart file to run if you want to run an example that doesn't have a lib/main.dart file using the -t command-line option. For example, to run the widgets/spinning_square.dart example in the examples/layers directory on a connected Android device, from that directory you would run: flutter run -t widgets/spinning_square.dart