PX,DP,SP,PT analysis and conversion of common unit of measurement in New ui-

PX,DP,SP,PT analysis and conversion of common unit of measurement in New ui-

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The text of this section:

for units of measurement, we are habitually divided into: relative units and absolute units , from the word meaning we can

guess, the relative can be based on different scenarios to show different sizes, commonly used are: DP,PX,SP ;

and absolute units is that we have developed a standard, such as mm (mm), write dead, 1mm so much,

under what circumstances are so many, and commonly used to have , in (Inch, 2.54cm), pt (LB) printing industry commonly used

Unit, 1 pt = 1/72 in! So, what we are going to discuss today is relative unit: PX,DP,SP;

I believe you are not unfamiliar with them, such as writing to death a imageview of the width of the high; margin how many DP

Set the offset, draw a 1px wide view to form a straight line, and so on. Then this section will come

1. Study the concept of PX,DP,SP

2. Units to convert each other, write a simple tool class

3. Why do I use DP instead of PX for layout?

All right, let's start with this section!

s) The concept of PX,DP,SP:

2) units to convert each other, write a simple tool class

/** * This tool class is used for: PX,DP,SP conversion * @author Coder-pig * */public class Displayutil {//1.px to dppublic static int Px2dip (Context con         Text, float pxvalue) {final float scale = context.getresources (). Getdisplaymetrics (). density;     return (int) (Pxvalue/scale + 0.5f); }//2.DP to px public static int dip2px (context context, float Dipvalue) {final float scale = Context.getr         Esources (). Getdisplaymetrics (). density;     return (int) (Dipvalue * scale + 0.5f); }//3.px to SP public static int PX2SP (context context, float Pxvalue) {final float Fontscale = Context.get         Resources (). Getdisplaymetrics (). scaleddensity;     return (int) (Pxvalue/fontscale + 0.5f); }//4.SP to px public static int sp2px (context context, float Spvalue) {final float Fontscale = context.ge         Tresources (). Getdisplaymetrics (). scaleddensity;     return (int) (Spvalue * fontscale + 0.5f); } }

3. Why do I use DP instead of PX for layout?

Answer: in the previous section we already know the screen density dpi this concept, although the same size of the phone, but their

DPI can be different, DPI is the number of pixels inside the unit length, then the dpi of the smaller phones, pixels will be

Larger than the DPI of the cell phone pixel, then if we use PX, the large DPI phone may appear to be normal,

However, the smaller DPI phone may appear misaligned, the interface is far from the expected effect, and may exceed the boundary!px can

is understood as physical pixels, and DP is a virtual pixel, using DP can solve these problems, so we are still accustomed to

Use DP!!! When layout

Reference documents:

Http://www.cnblogs.com/yaozhongxiao/archive/2014/07/14/3842908.html

PX,DP,SP,PT analysis and conversion of common unit of measurement in New ui-