Android dip method of px and size conversion

Why 80% of the code can not do farming architect? >>>  

px converted to dip

/**
     * PX 转换为 DP
     *
     * @param context
     * @param px
     * @return
     */
    public static int px2dp(Context context, int px)
    {
        float scale = context.getResources().getDisplayMetrics().density;
        return (int) (px / scale + 0.5f);
    }

dip converted px

/**
     * DP 转换为 PX
     *
     * @param context
     * @param dp
     * @return
     */
    public static int dp2px(Context context, int dp)
    {
        float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dp * scale + 0.5f);
    }

Reproduced in: https: //my.oschina.net/zhouz/blog/213123