GUI on Android

Question

I noticed SoloLearn and many other apps can compile the console, but don't have support to compile GUI. Can somebody explain why? I tried some Java IDE apps and nothing!

Answer 1

Not sure about Java( actually tried but couldn't find one) but there's an app called Pydroid3 which let's you create GUI with Python on Android.
Java-N-IDE is the one which let's you create Android apps using your smartphone but again, it doesn't work for GUI output.

Answer 2

Because different SO, need different APIs for gui design. and languages like C, C++, C#, Java(Except Android Studio), Python, etc. are maked for desktop, no for android.