Is it possible to create an application (messenger) for android (android studio) using php html css + MySQL?

Question

MySQL

Or how are things normally done? And where to store all the information if not mysql?

Answer 1

Theoretically yes, practically no. You will have to learn a programming language that has libraries for Android development such as Java (this is the "native" language of Android), Kotlin (another "official" language for Android development), C# (there is an excellent Xamarin framework for it), F# ( a very good PL that can use Xamarin), Javascript (it has many different frameworks, for example, React Native), Dart (Flutter is said to be a very good framework), etc.

Answer 2

in general on HTML/CSS, PHP/MySQL it is possible. only it will be a webview application, without push notifications. and a messenger without Push can hardly be called a messenger