Google announced that the Kotlin programming language is presently its favored language for Android application developers.
“Android development will turn out to be progressively Kotlin-first,' Google writes in today's announcement. “Numerous new Jetpack APIs and features will be offered first in Kotlin. In case you're beginning a new project, you ought to compose it in Kotlin; code is written in Kotlin often mean much less code for you–less code to type, test, and maintain.”

It was just two years back, at I/O 2017, that Google declared help for Kotlin in its Android Studio IDE. That came as a bit of a surprise, given that Java had long been the preferred language for Android application development, but few announcements at that year’s I/O got more applause. Over the course of the most recent two years, Kotlin popularity has only increased.
According to Google, more than 50% of developers by Android experts use languages to build their applications and in the most recent Stack Overflow developer survey, it ranks as the fourth most preferred programming language.

With that, it makes sense for Google to expand its Kotlin support. 'We're reporting that the following huge step that we’re making is that we’re going Kotlin-first,” Chet Haase, chief advocate for Android, said.
“We understand that not every person is on Kotlin at this moment, however, we trust that you ought to arrive. There may be valid reasons for you to still be using the C++ and Java programming languages and that is absolutely fine. These are not leaving.'