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Question

I have created different layouts (layout, layout-small, layout-normal, layout-large, layout-xlarge) and for values (values, values-ldpi, values-mdpi, values-n

Answer 1

you are using only portrait version, if you are using same structure of design for all devices you don't need to add four different layout for each pixel density.

create android values folders that supports different screen sizes.

Here first folder for 7inch android devices that have ANDROID version 3.1 or less. second one is for 7inch devices that have android version greater than 3.1. naming convention sw600 means smallest width of 600. so this folder works for width size 600 to 720. So create values-sw480dp and values-sw320 add values to dimens.xml file.

Android runtime automatically picks values from appropriate folder.