is dp really device independent?

问题

This sounds stupid , but I have confusion. I have defined a layout which have a stripe of images . Strip height is set as some x dp. But I can see difference in height , in difference phones (in samsung note2 it looks bigger than nexus 4). Can someone explain or provide some useful links ?

Thanks in advance.

回答1:

FYI, DP stands for Density independent pixel.

And Here is definition of Screen density:

Screen density

The quantity of pixels within a physical area of the screen; usually referred to as dpi (dots per inch). For example, a "low" density screen has fewer pixels within a given physical area, compared to a "normal" or "high" density screen.

Reference: http://developer.android.com/guide/practices/screens_support.html

回答2:

These may help:

What is the difference between "px", "dp", "dip" and "sp" on Android?

http://developer.android.com/guide/practices/screens_support.html

回答3:

The mdpi, hdpi, xhdpi, ... suffixes stands for generalized densities.

That means that 2 xhdpi phones might have slightly different real densities.

For example, Galaxy Nexus and Galaxy SIII are both noted as xhdpi, but Galaxy Nexus has a 316ppi screen, whereas Galaxy SIII screen is a 306ppi

source: Wikipedia

来源：https://stackoverflow.com/questions/15879077/is-dp-really-device-independent