Density is how many pixels appear within a constant area of the display, and size is the amount of physical space available for displaying your interface.
* sp (scale-independent pixel)
- To define text sizes.
- Depends on a user setting and the system scales the size the same as it does for dp.
* dp
- To remove the size/density calculations from the picture and should use dp for layout dimensions
- Because that the system(Android famework) can adjust dp units for screen density.
* Reference
- Supporting Multiple Screens | Android Developers
- Android Developers Blog: New Tools For Managing Screen Sizes
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