A Java™ developer who is used to developing GUIs with Swing and who is now trying to get into Android might be surprised: Java is not the same on Android.

The fact that Java is different on Android has been discussed in some blogs on the net already, so I just sum it up to this: Android applications can be written by any developer who knows the Java programming language. But the number of available runtime classes on Android is different: there are fewer classes in Android regarding package java.* compared to Sun Java Standard or Micro Edition. The most surprising fact for a Java GUI developer might be that there is no Swing on Android.

This article demonstrates some aspects of how a simple Java Swing application with a nice Look and Feel was transferred to Android. The main focus is set on how to write the application with the Android SDK and the styling and theming abilities of Android.