This is Android Studio telling you that you have used a new construct (View) without importing it in the import section, at the top of the Java code. This is easy to fix.

As the official IDE, Android Studio has come along way since its introduction in 2014 and is now a powerful and (mostly) user-friendly interface for building Android apps. Here is an introduction ...

Among the features that Android Studio provides you'll find an environment for editing the code (called the code editor), a visual layout editor (which lets developers drag specific components ...

In VS Code, Java tooling is provided via various extensions, which can be downloaded together with the Java Pack Installer that can be found on Microsoft's Java in Visual Studio Code page. "A call ...