I have made changes to my App using Rkimball's App Builder but they don't seem to reflect on my Android device even after refreshing the App, what can I do?

First of all, you need to save your app by clicking on "Save & Finish" button then try to close the app and reopen it, if the change still not reflect then try to uninstalling the app and then install again, hopefully this will refresh your app. Following are Steps to Uninstall an App on Android Device

1. Navigate to Menu > Settings > Applications > Manage applications (on devices running Android 4.0 Ice Cream Sandwich, Settings > Apps).
2. Scroll through the list of apps to find the one which you want to uninstall.
3. Tap on the app which you want to uninstall.
4. Tap and uninstall the app.
5. Now reinstall your app.