How we can run GUI Java application on smartphone ?

Question

I searched everywhere on internet but I don't found any app or website to run java GUI application.

Answer 1

Most native Android applications are written with Java so most applications actually run a Java-based graphical user interface. To write a native Android application using Java, install Android Studio and just learn how to use it.
You might be referring to more conventional Java-based GUI packages like javax.swing or java.awt, though. This is harder. I never did this. https://github.com/javalovercn/j2se_for_android looks like it could help but it mentions that not all of the swing and awt functions are implemented.