If your code base is already in Java you may need to at least understand it, for new functionality you can mix Kotlin with your old Java code without a problem. In general I think most new Android projects are using Kotlin. But as an Android dev, you need to know both languages.

Yes, I agree with you. My question got a bit out of context here. I had asked it in another topic because I saw someone publishing a new book about how to develop android apps using Java, and I became curious because (at least in my bubble) I haven’t seen anyone using Java for new Android apps in the past 6 or more years.
But the question was taken out of the topic and put it here.

Do Companies Still Use Java for Their New Android Apps?

Introduction

Java has been a major player in Android app development for many years. However, with new languages and technologies emerging, you might wonder if companies still use Java for their new Android apps. Let’s break it down step by step.

1. Java’s Historical Importance

Java has been the primary language for Android app development since the Android platform’s inception. It offers a solid performance, a vast library of tools, and strong community support, making it a popular choice for many years.

2. The Rise of Kotlin

In 2017, Google introduced Kotlin as an official language for Android development. Kotlin is favored for its concise syntax, enhanced safety features, and compatibility with Java. Many developers and companies are now choosing Kotlin for new projects due to these advantages.

3. The Role of React Native App Development Services

Besides Java and Kotlin, some companies are using cross-platform solutions like React Native. React Native allows developers to create apps for both Android and iOS using a single codebase, saving time and resources. This makes React Native app development services popular among businesses looking to target multiple platforms.

4. Choosing the Right Language

• Project Requirements: The choice of language often depends on the project’s specific needs. Java might still be used for maintaining older systems or integrating with existing Java codebases.
• Developer Expertise: Companies may choose a language based on their team’s expertise. Those with strong Java backgrounds might continue using it, while others may opt for Kotlin or React Native.
• Community and Ecosystem: Kotlin and React Native have thriving communities, offering extensive libraries and tools that can speed up development.

While Java is still in use for certain Android projects, many companies are shifting towards Kotlin and React Native for new app development. These modern technologies offer efficient, scalable, and cross-platform solutions that cater to the evolving needs of businesses.