标和上标为同一字中的TextView？ [英] subscript and superscript for the same word in the TextView?

问题描述

有没有办法来标和上标为同一词在TextView中我想显示如下文字：

Is there a way to subscript and superscript for the same word in the TextView?I want to display a text that looks like this:

所以，我想这code：

So,I tried this code:

TextView tv1 = ... ;
String latex = "\u222E";
tv1.setText(Html.fromHtml(latex + "<sup>200</sup><sub>2</sub> f(x)dx"));

但结果是这样的：

But the result is this:

您可以看到标出现subscript.How后，我可以解决这个问题？我能解决它的 SpannableString ？或者，我可以改变下标位置？

You can see the superscript appears after the subscript.How I can solve this problem?Can I solve it with SpannableString? Or can I change the position of subscript?

推荐答案

这个自定义范围可以帮助你了解基础的想法：

this custom span can help you understand the base idea:

class SupSubSpan extends ReplacementSpan {
    private String sup;
    private String sub;

    public SupSubSpan(String sup, String sub) {
        this.sup = sup;
        this.sub = sub;
    }

    @Override
    public int getSize(Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
        return (int) Math.max(paint.measureText(sup), paint.measureText(sub));
    }

    @Override
    public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
        canvas.drawText(sup, x, y + paint.ascent() / 2, paint);
        canvas.drawText(sub, x, y - paint.ascent() / 2, paint);
    }
}

这篇关于标和上标为同一字中的TextView？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！