在TextView中使用SpannableStringBuilder的段落间距 [英] Paragraph spacings using SpannableStringBuilder in TextView

问题描述

正如问题所示，我正在研究TextView，它将使用SpannableStringBuilder显示格式化的文本.它有多个段落，我想知道使用某些内置跨度在段落之间设置间距的最简单(或至少最简单)的方法.这可能吗?还是需要为此构建一个自定义的span类?

As the question indicates, I am working on a TextView which will show formatted text using SpannableStringBuilder. It has multiple paragraphs and I would like to know what would be the easiest (or at least the least complicated) way to set spacing between paragraphs using some inbuilt span. Is this possible? Or will I be required to build a custom span class for this?

推荐答案

实施LineHeightSpan并覆盖chooseHeight方法，如下所示

Implement the LineHeightSpan and override chooseHeight method as follows

@Override
public void chooseHeight(CharSequence text, int start, int end,
        int spanstartv, int v, FontMetricsInt fm) {
    Spanned spanned = (Spanned) text;
    int st = spanned.getSpanStart(this);
    int en = spanned.getSpanEnd(this);
    if (start == st) {
        fm.ascent -= TOP_SPACING;
        fm.top -= TOP_SPACING;
    }
    if (end == en) {
        fm.descent += BOTTOM_SPACING;
        fm.bottom += BOTTOM_SPACING;
    }
}

别忘了在每个段落文本的末尾添加\n.

Don't forget to add \n at the end of your each paragraph text.

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