I am creating different xml layout files within the same app to cater for different devices - notably tablets. I am saving the xml files within new folders e.g. Res/layout-w720dp as per the advice from http://developer.android.com/guide/practices/screens_support.html#DeclaringTabletLayouts But how and where do I call the use of these xml files? Is it within the java source code (screen quiz file) using some kind of if-else statement? Does the manifest file need to be altered also? Your help much appreciated.

yep, exactly right. If you look at the onCreateView method (or onCreate for 2.0 apps), you'll see something like this: //inflate the layout file for this screen... View thisScreensView = inflater.inflate(R.layout.bt_screen_quiz, container, false); If you notice, it inflates (or opens the file for viewing) the XML file "bt_screen_quiz", located in the "R.layout" folder ("R" stands for "res"). So, if you wanted to decide between 2 XML files, one for large and one for small devices, you could do something like this: View thisScreensView = inflater.inflate(R.layout.bt_screen_quiz, container, false); if (isLargeDevice) thisScreensView = inflater.inflate(R.layout.bt_screen_quiz_large, container, false);

Thanks @Chris1. I'm on the right track then. I'll have more than 2 xml files, so will have to expand your statement to cover all options. Some thoughts - please correct if i'm heading in the wrong direction ... The 'LargeDevice' is established in the BT_device.java file, which uses some deprecated language (getWidth) so this may need updating manually. Would I be right to assume the BT quiz uses width in pixels rather than dp? If so, then I'll need to update this to establish the device dp width (not px) and take it from there ...

Yep - device width (I think on the appDelegate actually) is based on width in pixels. Not always the best formula depending on what you're trying to do.