Measurement Units supported by Android

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1. you can create common dimensions to use for various screen elements by defining dimension values in XML. A dimension resource is a number followed by a unit of measurement. for example: 10px, 2in, 5sp. here are the units of measurement supported by Android:

(1) Px --> pixels-corresponds to actual pixels on the screen.

(2) In --> inches-based on the physical size of the screen.

(3) Mm --> millimeters-based on the physical size of the screen.

(4) Pt --> points-1/72 of an inch based on the physical size of the screen.

(5) DP --> density-independent pixels-an abstract unit that is based on the physical density of the screen. these units are relative to a 160 DPI screen, so one DP is one pixel on a 160 DPI screen. the ratio of DP-to-pixel will change with the screen density, but not necessarily in direct proportion. note: The Compiler accepts both "dip" and "DP", though "DP" is more consistent with "SP ".

(6) sp --> Scale-independent pixels-this is like the DP unit, but it is also scaled by the user's font size preference. it is recommend you use this unit when specifying font sizes, so they will be adjusted for both the screen density and user's preference.

2. dimension values are not normally used as raw resources, but rather as attribute values in XML files. You can, however, create plain resources containing this data type.

Source File Format: XML file requiring a declaration, and a root  Element containing one or more  Tags.

Resource source file location: Res/values/dimens. XML (file name is arbitrary; standard practice is to put all dimensions in one file already Ted to dimensions .)

Compiled resource datatype: Resource pointer to a dimension.

Resource reference Name:

Java: R. dimen. some_name

XML: @ [Package:] dimen/some_name (where some_name is the name of a specific  Element)

Syntax

XMLCode

< Dimen   Name = Dimen_name > Dimen_value </ Dimen >  

<Dimen> A valid dimension value. name-the name used in referring to this dimension.

Example XML Declaration

The following Code declares several dimension values.

< Dimen   Name = "Double_density" > 2dp </ Dimen >

< Dimen   Name = "Sixteen_sp" > 16sp </ Dimen >

</Resources>

 

Example Java code:

Java code

Float dimen = resources. getdimen (R. dimen. one_pixel );

Example XML code:

XML Code

textview Android: layout_width = " fill_parent "

Android: layout_height = " wrap_content "

Android: textsize="@ Dimen/sixteen_sp"/> 

 

3. Summary

Dip: Device Independent pixels (device independent pixel). Different devices have different display effects.

Px: pixels (pixels). Different devices have the same display effect.

SP: scaled pixels (zoom in pixels). It is mainly used to display the best for textsize in fonts.

Pt/In/mm is not explained. There is nothing to explain.