Conversion between DP,SP and PX in Android development

This article is reproduced in http://blog.csdn.net/student9128/article/details/53932470

It is well known that the conversion between DP and PX,SP and PX is essential in Android development, and the following code is recorded:

1  Public classDisplayutils {2     /**3 * Convert PX to its equivalent DP4      * 5 * Convert px to equal DP6      */7      Public Static intPX2DP (Context context,floatpxvalue) {8         Final floatScale =context.getresources (). Getdisplaymetrics (). density;9         return(int) (Pxvalue/scale + 0.5f);Ten     } One  A  -     /** - * Convert DP to its equivalent PX the      *  - * Converts the DP to an equal PX -      */ -      Public Static intDP2PX (Context context,floatdipvalue) { +         Final floatScale =context.getresources (). Getdisplaymetrics (). density; -         return(int) (Dipvalue * scale + 0.5f); +     } A  at  -     /** - * Convert px to its equivalent SP -      *  - * Convert px to SP -      */ in      Public Static intPX2SP (Context context,floatpxvalue) { -         Final floatFontscale =context.getresources (). Getdisplaymetrics (). scaleddensity; to         return(int) (Pxvalue/fontscale + 0.5f); +     } -  the  *     /** $ * Convert SP to its equivalent PXPanax Notoginseng      *  - * Convert SP to px the      */ +      Public Static intSP2PX (Context context,floatspvalue) { A         Final floatFontscale =context.getresources (). Getdisplaymetrics (). scaleddensity; the         return(int) (Spvalue * Fontscale + 0.5f); +     } - 

The system also provides the Typedvalue class to help us convert

1 /**2 * Convert DP to its equivalent PX3 */4 protected intDP2PX (intDP) {5         return(int) typedvalue.applydimension (Typedvalue.complex_unit_dip, Dp,getresources (). Getdisplaymetrics ());6     }7 8 /**9 * Convert SP to its equivalent PXTen */ One protected intSP2PX (intsp) { A         return(int) typedvalue.applydimension (typedvalue.complex_unit_sp, Sp,getresources (). Getdisplaymetrics ()); -}

Conversion between DP,SP and PX in Android development