Along with some sweet changes and new features in Android 1.5 there are some changes to the UI framework that may affect some applications. In fact, Android 1.5 brings a new default look to the overall Android UI framework.
Buttons and checkboxes have a new design and though it doesn't change the overall binary/source compatibility, it may break the UI of your application. To quote Google:
Luckily, Google offers a solution to this potential problem:
It looks like developers can easily accommodate for this design change and we think it definitely looks more polished. What do you guys think?
Hit the jump to see more pictures of the design changes in Android 1.5