如何使用iText Android在单个字符串中使用常规和粗体

Question

我有一个由恒定部分和可变部分组成的字符串。我希望变量在文本段落中使用常规字体设置格式，而我希望常量部分为粗体。

这是我的代码：

    val boldFont = Font(Font.FontFamily.TIMES_ROMAN, 22f, Font.BOLD)
    val semiBoldFont = Font(Font.FontFamily.TIMES_ROMAN, 16f, Font.BOLD)
    val normalFont = Font(Font.FontFamily.TIMES_ROMAN, 16f, Font.NORMAL)
    val lineSeparator = LineSeparator()
    lineSeparator.lineColor = BaseColor(0, 0, 0, 68)


//      NAME OF THE STUDENT
    val paragraph = Paragraph(student?.Student_Name, boldFont)
    paragraph.alignment = Paragraph.ALIGN_CENTER

//      DOB
    val paragraphTwo = Paragraph("Date of Birth: ", semiBoldFont)
    paragraphTwo.add(Chunk(student?.Student_DOB , normalFont))
    paragraphTwo.alignment = Paragraph.ALIGN_CENTER

//      Place and Country of Birth
    val paragraphThree = Paragraph("Place and Country of Birth: ", semiBoldFont)
    paragraphThree.add(Chunk(student?.Student_City + ", " + student?.Student_Country, normalFont))
    paragraphThree.alignment = Paragraph.ALIGN_CENTER

//      Address
    val paragraphFour = Paragraph("Address: ", semiBoldFont)
    paragraphFour.add(Chunk(student?.Student_Address + ", " + student?.Student_City + ", " + student?.Student_Country, normalFont))
    paragraphFour.alignment = Paragraph.ALIGN_CENTER

//      Nationality
    val paragraphFive = Paragraph("Nationality: ", normalFont)
    paragraphFive.add(Chunk(student?.Student_Nationality_One + ", " + student?.Student_Nationality_Two, normalFont))
    paragraphFive.alignment = Paragraph.ALIGN_CENTER

try {
        document.add(paragraph)
        document.add(Chunk(lineSeparator))
        document.add(paragraphTwo)
        document.add(paragraphThree)
        document.add(paragraphFour)
        document.add(paragraphFive)

        if (educationList.size > 0) {
            document.add(Paragraph("Education", boldFont))
            document.add(Paragraph(" "))
        }

    } catch (e: DocumentException) {
        e.printStackTrace()
    }

输出：

Answer 1

如果您在Paragraph构造函数中设置了字体，则稍后添加的Chunk对象使用的字体是该块的字体，并由段落字体中的数据补充属性未设置为块字体 。

字体的样式是一个位字段，不幸的是，样式字段中的这个补充是通过按位或运算实现的。因此，将段落字体中的 BOLD 标志与添加到段落中的所有块的样式相加！

您可以通过根本不设置段落级别的字体（或者至少不设置带有样式位的字体）来避免这种情况，还可以将标签作为单独的块添加，例如代替

// DOB
val paragraphTwo = Paragraph("Date of Birth: ", semiBoldFont)
paragraphTwo.add(Chunk(student?.Student_DOB , normalFont))
paragraphTwo.alignment = Paragraph.ALIGN_CENTER

做

// DOB
val paragraphTwo = Paragraph()
paragraphTwo.add(Chunk("Date of Birth: ", semiBoldFont))
paragraphTwo.add(Chunk(student?.Student_DOB , normalFont))
paragraphTwo.alignment = Paragraph.ALIGN_CENTER

或者也许

// DOB
val paragraphTwo = Paragraph("", normalFont)
paragraphTwo.add(Chunk("Date of Birth: ", semiBoldFont))
paragraphTwo.add(Chunk(student?.Student_DOB , normalFont))
paragraphTwo.alignment = Paragraph.ALIGN_CENTER

（这些选项的区别在于，基于段落字体信息，在段落之前添加了一些间距。）