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/** 
 * 常用单位转换的辅助类 
 *  
 *  
 *  
 */ 
public class DensityUtils  
{  
    private DensityUtils()  
    {  
        /* cannot be instantiated */ 
        throw new UnsupportedOperationException("cannot be instantiated");  
    }  
   
    /** 
     * dp转px 
     *  
     * @param context 
     * @param val 
     * @return 
     */ 
    public static int dp2px(Context context, float dpVal)  
    {  
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,  
                dpVal, context.getResources().getDisplayMetrics());  
    }  
   
    /** 
     * sp转px 
     *  
     * @param context 
     * @param val 
     * @return 
     */ 
    public static int sp2px(Context context, float spVal)  
    {  
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,  
                spVal, context.getResources().getDisplayMetrics());  
    }  
   
    /** 
     * px转dp 
     *  
     * @param context 
     * @param pxVal 
     * @return 
     */ 
    public static float px2dp(Context context, float pxVal)  
    {  
        final float scale = context.getResources().getDisplayMetrics().density;  
        return (pxVal / scale);  
    }  
   
    /** 
     * px转sp 
     *  
     * @param fontScale 
     * @param pxVal 
     * @return 
     */ 
    public static float px2sp(Context context, float pxVal)  
    {  
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);  
    }  
   
}