如何在SpannableString扭转跨距优先 [英] How to reverse priority of spans in a SpannableString

问题描述

这是加入spannable跨度的优先级会影响在一个TextView它的外观。
当我们添加两个嵌套字符样式到spannable像下面

The priority of spans that added to a spannable affects on appearance of it in a TextView. When we add two nested Character Style to a spannable like below

SpannableStringBuilder sp = new SpannableStringBuilder();
String blue = "blue";
String red = "red";
sp.append(blue);
sp.append(red);
sp.append(blue);
sp.setSpan(new ForegroundColorSpan(Color.RED), blue, 2*blue, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);        
sp.setSpan(new ForegroundColorSpan(Color.BLUE), 0, sp.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
((TextView)findViewById(R.id.text_view)).setText(sp);

添加字符样式的顺序是文本外观很重要。
Android的制作方式，通过Spanned.SPAN_PRIORITY标志来处理跨度的优先级。但是，当我们使用Html.fromHtml（）的，重点是不在我们手里。所以，我可以改变Html.fromHtmel的输出范围的优先级或者我能让新spannable从做出新跨越的重点;

The order of adding character styles is important on appearance of text. Android make a way to handle the priority of spans through Spanned.SPAN_PRIORITY flag. But when we use of Html.fromHtml(), priorities are not in our hands. So can i change span priorities of output of Html.fromHtmel or can i make new spannable from that and make new span priorities;

推荐答案

我做我自己一点点的解决方法。它使用反转跨度创造了新的Spannable。

I did for myself a little workaround. It creates new Spannable with spans reversed.

final Spannable revertSpans(Spanned stext) {
    Object[] spans = stext.getSpans(0, stext.length(), Object.class);
    Spannable ret = Spannable.Factory.getInstance().newSpannable(stext.toString());
    if (spans != null && spans.length > 0) {
        for(int i = spans.length - 1; i >= 0; --i) {
            ret.setSpan(spans[i], stext.getSpanStart(spans[i]), stext.getSpanEnd(spans[i]), stext.getSpanFlags(spans[i]));
        }
    }

    return ret;
}

用法：

TextView tv = (TextView)finViewById(R.id.my_text_view);
Spanned stext = Html.fromHtml(text, null, myTagHandler);
Spannable sreverted = revertSpans(stext); 
tv.setText(sreverted);

这也许是有用的。

Maybe this be usefull.

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