使用动态字符串将文本设为粗体、斜体和下划线

Question

我目前正在尝试弄清楚如何使文本粗体、斜体或带有来自 API，必须加粗的文本显示为 * 粗体 *，斜体显示为 _ italic_，下划线显示为 #underline#（与 Whosebug 的功能相同）。文本转换成功后，我想把特殊字符也去掉。

Text from API - * I am Bold* and love to see _myself and _ others too.

Expected answer - I am Bold and love to see myself and others too.

我尝试了一些代码，如果我尝试在粗体后创建斜体，如果我尝试删除特殊字符，这些代码也不起作用。

TextView t = findViewById(R.id.viewOne);
String text = "*I am Bold* and _I am Italic_ here *Bold too*";
SpannableStringBuilder b = new SpannableStringBuilder(text);
Matcher matcher = Pattern.compile(Pattern.quote("*") + "(.*?)" + Pattern.quote("*")).matcher(text);

while (matcher.find()){
  String name = matcher.group(1);
  int index = text.indexOf(name)-1;
  b.setSpan(new StyleSpan(Typeface.BOLD), index, index + name.length()+1, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE);
}
t.setText(b);

我不想使用 HTML 标签

Answer 1

Edited answer to address the edited question

试试下面，你应该通过 typeface 而不是 StyleSpan。

public class SpanTest extends Activity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        TextView test = findViewById(R.id.test);
       // String text = "*I am Bold* and _I am Italic_ here *Bold too*";
        String text = "* I am Bold* and love to see _myself and _ others too";
        CharSequence charSequence = updateSpan(text, "*", Typeface.BOLD);
        charSequence = updateSpan(charSequence, "_", Typeface.ITALIC);
        test.setText(charSequence);
    }

    private CharSequence updateSpan(CharSequence text, String delim, int typePace) {
        Pattern pattern = Pattern.compile(Pattern.quote(delim) + "(.*?)" + Pattern.quote(delim));
        SpannableStringBuilder builder = new SpannableStringBuilder(text);
        if (pattern != null) {
            Matcher matcher = pattern.matcher(text);
            int matchesSoFar = 0;
            while (matcher.find()) {
                int start = matcher.start() - (matchesSoFar * 2);
                int end = matcher.end() - (matchesSoFar * 2);
                StyleSpan span = new StyleSpan(typePace);
                builder.setSpan(span, start + 1, end - 1, 0);
                builder.delete(start, start + 1);
                builder.delete(end - 2, end - 1);
                matchesSoFar++;
            }
        }
        return builder;
    }
}

这是输出。

使用动态字符串将文本设为粗体、斜体和下划线

Making text Bold, Italic and Underscore with Dynamic string

android

textview

android-spannable