The issue I was facing was to build and run my application and terminal saying 'Your project is doesn't support AndroidX'.
Solution: https://flutter.dev/docs/development/androidx-migration
So I went to the given link and tried to implement it by the help of Android Studio, but it always leads to No usage found.
So I went back to the link and tried the other approach of editing the gradle.properties in android level (android/gradle) and add these properties:
android.useAndroidX=true
android.enableJetifier=true