Android TextView 中的有序列表 [英] Ordered lists inside an Android TextView

问题描述

我想在 TextView 中显示一个有序列表，例如:
1) 项目 1
2)第2项

I want to display an ordered list inside a TextView, for example:
1) item 1
2) item 2

使用以下布局:

<TextView
    android:text="<ol><li>item 1
</li><li>item 2
</li></ol>
    />

我明白了:

• 项目 1
• 第 2 项

如何将项目符号更改为数字?

How can I change the bullets to numbers?

谢谢.

推荐答案

我认为您必须在代码中执行此操作.我必须继承LeadingMarginSpan 才能让它工作.这是我的做法.

I think you have to do this in code. I had to subclass LeadingMarginSpan to get this to work. Here is how I did it.

private class NumberIndentSpan implements LeadingMarginSpan {

    private final int gapWidth;
    private final int leadWidth;
    private final int index;

    public NumberIndentSpan(int leadGap, int gapWidth, int index) {
        this.leadWidth = leadGap;
        this.gapWidth = gapWidth;
        this.index = index;
    }

    public int getLeadingMargin(boolean first) {
        return leadWidth + gapWidth;
    }

    public void drawLeadingMargin(Canvas c, Paint p, int x, int dir, int top, int baseline, int bottom, CharSequence text, int start, int end, boolean first, Layout l) {
        if (first) {
            Paint.Style orgStyle = p.getStyle();
            p.setStyle(Paint.Style.FILL);
            float width = p.measureText("4.");
            c.drawText(index + ".", (leadWidth + x - width / 2) * dir, bottom - p.descent(), p);
            p.setStyle(orgStyle);
        }
    }
}

掌握你的观点，并像这样使用它:

Get hold of your view, and use it like this:

SpannableStringBuilder content = new SpannableStringBuilder();
for(String text : list) {
    int contentStart = content.length();
    content.append(text);
    content.setSpan(new NumberIndentSpan(15, 15, number), contentStart, content.length(), 0);
}

TextView view = findViewById(R.id.....);
view.setText(content);

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