How can I convert Java code in Android Java code?

[Davide Prampolini]

I guys I'm newbie... very newbie, so newbie and dumb that I coded a whole program in Java to discover, once the project was complete, that it cannot run on Android OS.

Do you guys know if exists a converter, or a way to convert it without recode it from scratch?

Thanks in advance for your support.  

[Norm Radder]

a way to convert it  

Much java code can be copied into an Android program.  However the framework and GUI needs to be completely rewritten for the Android environment.

[Tim Moores]

The Android programming model, to say nothing of the actual API, is very different from desktop Java. While it uses the same language and syntax, the way of creating apps is very different. For example, the AWT, Swing and JavaFX GUI toolkits of desktop Java are missing entirely, as are many other Java SE packages. See https://developer.android.com/reference/packages.html for what's available on Android, and then head over to https://developer.android.com/develop/index.html to learn about the Android programming model.

[Davide Prampolini]

Norm Radder wrote:
Much java code can be copied into an Android program.  However the framework and GUI needs to be completely rewritten for the Android environment.

My program is 90% GUI and framework...

Thanks for your support guys, it seems I'll have to rework it.