Do I need to learn anything but Java and XML to make apps on Android?

Answer 1

Using Java and XML as your foundation for Android Programming is fine but if you want to build more robust, high quality apps, that won't be enough.

You must also learn how to use and maximize the features of the IDEs used for Android Programming.

Learn how to integrate frameworks and APIs to your program for much faster development.

Improve your knowledge on database manipulation. Especially for SQLite and other cloud based database services.

Also try to study Material Design for it is the new trend in designing mobile apps.

Answer 2

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