Kotlin or Flutter ?

Question

In future , which language ( Kotlin or Flutter ) is going to replace java for developing android apps and why ?

Answer 1

Flutter is not a language. It is a cross platform (hybrid) framework, using the Dart language.
On the other hand you can build Android apps written purely in Kotlin language, but to make those apps cross-platform (also work on iOS), you can use the Kotlin Native framework.
I wouldn't want to make any predictions, both technologies look promising and useful. If you only care about Android then for you, Kotlin may be the way to go, because native apps tend to outperform hybrid ones.
Check for more:
https://www.google.com/amp/developine.com/difference-between-kotlin-native-and-flutter-a-comparison/amp/