Home » What is the difference between “px”, “dip”, “dp” and “sp”?

What is the difference between “px”, “dip”, “dp” and “sp”?

Solutons:


Pretty much everything about this and how to achieve the best support for multiple screens of different sizes and densities is very well documented here:

  • Supporting Multiple Screens

Screen size
Actual physical size, measured as the screen’s diagonal.
For simplicity, Android groups all actual screen sizes into four
generalized sizes: small, normal, large, and extra-large.

Screen density
The number 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. For simplicity,
Android groups all actual screen densities into six generalized
densities: low, medium, high, extra-high, extra-extra-high, and
extra-extra-extra-high.

Orientation
The orientation of the screen from the user’s point of
view. This is either landscape or portrait, meaning that the screen’s
aspect ratio is either wide or tall, respectively. Be aware that not
only do different devices operate in different orientations by
default, but the orientation can change at runtime when the user
rotates the device.

Resolution
The total number of physical pixels on
a screen. When adding support for multiple screens, applications do
not work directly with resolution; applications should be concerned
only with screen size and density, as specified by the generalized
size and density groups.

Density-independent pixel (dp)
A virtual
pixel unit that you should use when defining UI layout, to express
layout dimensions or position in a density-independent way.
The density-independent pixel is equivalent to one physical pixel on a 160
dpi screen, which is the baseline density assumed by the system for a
“medium” density screen. At runtime, the system transparently handles
any scaling of the dp units, as necessary, based on the actual density
of the screen in use. The conversion of dp units to screen pixels is
simple:
px = dp * (dpi / 160).
For example, on a 240 dpi screen, 1 dp
equals 1.5 physical pixels. You should always use dp units when
defining your application’s UI, to ensure proper display of your UI on
screens with different densities.

If you are at all serious about developing an Android app for more than one type of device, you should have read the screens support development document at least once. In addition to that, it is always a good thing to know the actual number of active devices that have a particular screen configuration.

  • Screen Sizes and Densities

Related Solutions

Extract file from docker image?

You can extract files from an image with the following commands: docker create $image # returns container ID docker cp $container_id:$source_path $destination_path docker rm $container_id According to the docker create documentation, this doesn't run the...

Transfer files using scp: permission denied

Your commands are trying to put the new Document to the root (/) of your machine. What you want to do is to transfer them to your home directory (since you have no permissions to write to /). If path to your home is something like /home/erez try the following:...

What’s the purpose of DH Parameters?

What exactly is the purpose of these DH Parameters? These parameters define how OpenSSL performs the Diffie-Hellman (DH) key-exchange. As you stated correctly they include a field prime p and a generator g. The purpose of the availability to customize these...

How to rsync multiple source folders

You can pass multiple source arguments. rsync -a /etc/fstab /home/user/download bkp This creates bkp/fstab and bkp/download, like the separate commands you gave. It may be desirable to preserve the source structure instead. To do this, use / as the source and...

Benefits of Structured Logging vs basic logging

There are two fundamental advances with the structured approach that can't be emulated using text logs without (sometimes extreme levels of) additional effort. Event Types When you write two events with log4net like: log.Debug("Disk quota {0} exceeded by user...

Interfaces vs Types in TypeScript

2019 Update The current answers and the official documentation are outdated. And for those new to TypeScript, the terminology used isn't clear without examples. Below is a list of up-to-date differences. 1. Objects / Functions Both can be used to describe the...

Get total as you type with added column (append) using jQuery

One issue if that the newly-added column id's are missing the id number. If you look at the id, it only shows "price-", when it should probably be "price-2-1", since the original ones are "price-1", and the original ones should probably be something like...

Determining if a file is a hard link or symbolic link?

Jim's answer explains how to test for a symlink: by using test's -L test. But testing for a "hard link" is, well, strictly speaking not what you want. Hard links work because of how Unix handles files: each file is represented by a single inode. Then a single...

How to restrict a Google search to results of a specific language?

You can do that using the advanced search options: http://www.googleguide.com/sharpening_queries.html I also found this, which might work for you: http://www.searchenginejournal.com/how-to-see-google-search-results-for-other-locations/25203/ Just wanted to add...

Random map generation

Among the many other related questions on the site, there's an often linked article for map generation: Polygonal Map Generation for Games you can glean some good strategies from that article, but it can't really be used as is. While not a tutorial, there's an...

How to prettyprint a JSON file?

The json module already implements some basic pretty printing in the dump and dumps functions, with the indent parameter that specifies how many spaces to indent by: >>> import json >>> >>> your_json = '["foo", {"bar":["baz", null,...

How can I avoid the battery charging when connected via USB?

I have an Android 4.0.3 phone without root access so can't test any of this but let me point you to /sys/class/power_supply/battery/ which gives some info/control over charging issues. In particular there is charging_enabled which gives the current state (0 not...

How to transform given dataset in python? [closed]

From your expected result, it appears that each "group" is based on contiguous id values. For this, you can use the compare-cumsum-groupby pattern, and then use agg to get the min and max values. # Sample data. df = pd.DataFrame( {'id': [1, 2, 2, 2, 2, 2, 1, 1,...

Output of the following C++ Program [closed]

It works exactly like this non-recursive translation: int func_0() { return 2; } int func_1() { return 3; } int func_2() { return func_1() + func_0(); } // Returns 3 + 2 = 5 int func_3() { return func_2() + func_1(); } // Returns 5 + 3 = 8 int func_4() { return...

Making a circle out of . (periods) [closed]

Here's the maths and even an example program in C: http://pixwiki.bafsoft.com/mags/5/articles/circle/sincos.htm (link no longer exists). And position: absolute, left and top will let you draw: http://www.w3.org/TR/CSS2/visuren.html#choose-position Any further...

Should I use a code converter (Python to C++)?

Generally it's an awful way to write code, and does not guarantee that it will be any faster. Things which are simple and fast in one language can be complex and slow in another. You're better off either learning how to write fast Python code or learning C++...

tkinter: cannot concatenate ‘str’ and ‘float’ objects

This one line is more than enough to cause the problem: text="რეგულარი >> "+2.23+ 'GEL' 2.23 is a floating-point value; 'GEL' is a string. What does it mean to add an arithmetic value and a string of letters? If you want the string label 'რეგულარი...