问题
I unable to get the values from "values-sw480dp" nor on my sony Xperia device which is 480 x 854 neither on Samsung galaxy tab which is 600 x 1024. But able to get on Motorola Xoom which is 1280 x 752.
e.g res/values-sw480dp/strings.xml/
<string name="hello_world">hello world</string>
The values on respective devices
Sony Xperia ----> @2131034113
Samsung ----> @2131034113
on xoom ---> hello world
Can any one explain me this behavior, why Sony Xperia and Samsung has "@2131034113" value.
Thank you in advance
回答1:
According to http://developer.android.com/guide/topics/resources/providing-resources.html, sw480dp means «smallest side of screen must be at least 480 dp». Now dp is a «pixel on a 160 dpi screen», so actual size of e.g. Xperia in dp would be I guess 320 x 569 (provided it's a hdpi device).
To get device screen size in dp you need to know abstracted density class (ldpi=120, mdpi=160, hdpi=240, xhdpi=320). For the above Xperia screen the calculation is: (480*160/240) x (854*160/240), where 160 is the base density (it's where 1 dp actually equal to one pixel) and 240 is device abstracted density.
来源：https://stackoverflow.com/questions/12638518/android-resource-size-qualifier