ctrl+shift+p
then type Flutter:launch emulator
or
run this command in your VS code terminal flutter emulators
then see the result if you have installed any emulator it will show you , then to run one of them use flutter emulators --launch your_emulator_id
in my case flutter emulators --launch Nexus 6 API 28
but if you havent installed any emulator you can install one with flutter emulators --create [--name xyz]
then run your project flutter run
inside the root directory of the project