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Java: Historically, Java has been the main programming language for Android development. It was the official language for Android apps for many years, and the majority of Android codebases were written in Java.
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Kotlin: In 2017, Google announced Kotlin as an official language for Android development. Kotlin is now the preferred language for new Android projects. It's fully interoperable with Java, which means you can mix Kotlin and Java code in the same project.
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Kotlin is generally favored because of its modern features, more concise syntax, improved safety, and better support for functional programming. Google even recommends using Kotlin for new Android projects.
Which language use google for android apps?

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Java: Historically, Java has been the main programming language for Android development. It was the official language for Android apps for many years, and the majority of Android codebases were written in Java.
-
Kotlin: In 2017, Google announced Kotlin as an official language for Android development. Kotlin is now the preferred language for new Android projects. It's fully interoperable with Java, which means you can mix Kotlin and Java code in the same project.
-
Kotlin is generally favored because of its modern features, more concise syntax, improved safety, and better support for functional programming. Google even recommends using Kotlin for new Android projects.