App name & Package name

flutter_launcher_name

For editing app title thats show in the android launchers please follow this steps :

1- Open pubspec.yaml in your project folder and scroll until you will find this :

flutter_launcher_name:
  name: "Music Offline"

2- Replace Music Offline with the title you want and run this in your terminal :

flutter pub run flutter_launcher_name:main

change_package_name

Change App Package Name with single command. It makes the process very easy and fast.

Open your terminal and run this command :

flutter pub run change_app_package_name:main com.new.package.name

com.new.package.name is the custom package name you wanna set.