In Chapter 3 you were introduced to the Android resource framework. Using this framework you can create a parallel directory structure to store external resources for different host hardware configurations.
This section summarizes the folder-name qualifiers you can use to include alternative resources for different screen sizes, pixel densities, and aspect ratios.
> Screen size The size of the screen relative to a "standard" smartphone (such as the G1 or Droid).
> small A screen smaller than the standard 3.2"
> medium Typical smartphone screen size
> large A screen significantly larger than that of a typical smartphone, such as the screen of a tablet or netbook
> Pixel density Refers to the density of pixels on the display. Typically measured in dots per inch (dpi), this is calculated as a function of the physical screen size and resolution.
> ldpi Used to store low-density resources for screens with pixel density in the range of 100 to 140dpi
> mdpi Used for medium-density screens with 140 to 180dpi
> hdpi Used for high-density screens featuring 190 to 250dpi
> nodpi Used for resources that must not be scaled regardless of the host screen's density
> Aspect ratio The screen's aspect ratio is the ratio of its height to its width.
> long Used for screens that are significantly wider in landscape mode than those of standard smartphones (such as the G1)
> notlong Used for screens with a typical smartphone aspect ratio
Each of these qualifiers is independent and can be used independently, or in combination with each other, as shown in Listing 4-24.
Note that these qualifiers can also be used with the other resource folder qualifiers described in Chapter 3.
LISTING 4-24: Sample screen-based resource directory qualifiers
Available for download on Wrox.com res/layout-small-long/ // Layouts for small, long screens, res/layout-large/ // Layouts for large screens, res/drawable-hdpi/ // Drawables for high density screens.
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