What do you think about Xamarin .net or Flutter to write Android apps?
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Kotlin is the officially supported language from the platform and platform/library APIs are provided as Java APIs with optional Kotlin extensions. I don't think it's a good idea to use anything other than Kotlin for new apps. Java is best 2nd choice and easy to migrate to Kotlin.
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Flutter / Dart are not something used by Android or promoted by Android. It may be a good option for writing a cross-platform app but it's not a good option for writing a native Android only app. If resources aren't limited, native platform specific apps are going to be best.
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Or if there's just no plan to make it available on other platforms. The reason to use Flutter / Dart would be if you want to make an app for both iOS and Android and you want to try having a largely shared codebase between them. Requires being willing to make sacrifices on both.
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Users are going to use the native app written in Kotlin over an equally well made app made in Flutter / Dart because the Kotlin app will be better integrated into the platform with more familiar patterns and interfaces. Users prefer apps using the platform's toolkit / libraries.
If you want to use the bleeding edge, more modern approach to development, that's Jetpack Compose. Heavily using Kotlin, AndroidX and the rest of what they refer to as Jetpack is the way to go for native Android apps. Flutter / Dart only if you want portability beyond Android.
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