您可以使用此代码将部分文本设置为粗体。对于粗体html标签之间的任何内容，它都将使其加粗。

String myText = "make this <b>bold</b> and <b>this</b> too";
textView.setText(makeSpannable(myText, "<b>(.+?)</b>", "<b>", "</b>"));

public SpannableStringBuilder makeSpannable(String text, String regex, String startTag, String endTag) {

            StringBuffer sb = new StringBuffer();
            SpannableStringBuilder spannable = new SpannableStringBuilder();

            Pattern pattern = Pattern.compile(regex);
            Matcher matcher = pattern.matcher(text);
            while (matcher.find()) {
                sb.setLength(0);
                String group = matcher.group();
                String spanText = group.substring(startTag.length(), group.length() - endTag.length());
                matcher.appendReplacement(sb, spanText);

                spannable.append(sb.toString());
                int start = spannable.length() - spanText.length();

                spannable.setSpan(new android.text.style.StyleSpan(android.graphics.Typeface.BOLD), start, spannable.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
            sb.setLength(0);
            matcher.appendTail(sb);
            spannable.append(sb.toString());
            return spannable;
        }

它很简单，就像这样关闭指定的文本，例如<b>"你的文本在这里:"</b>

<string name="headquarters">"<b>"Headquarters:"</b>" Mooresville, North Carolina, U.S.</string>

结果: 总部:美国北卡罗来纳州穆尔斯维尔

这是我的完整的解决方案，动态字符串值与大小写检查。

/**
 * Makes a portion of String formatted in BOLD.
 *
 * @param completeString       String from which a portion needs to be extracted and formatted.<br> eg. I am BOLD.
 * @param targetStringToFormat Target String value to format. <br>eg. BOLD
 * @param matchCase Match by target character case or not. If true, BOLD != bold
 * @return A string with a portion formatted in BOLD. <br> I am <b>BOLD</b>.
 */
public static SpannableStringBuilder formatAStringPortionInBold(String completeString, String targetStringToFormat, boolean matchCase) {
    //Null complete string return empty
    if (TextUtils.isEmpty(completeString)) {
        return new SpannableStringBuilder("");
    }

    SpannableStringBuilder str = new SpannableStringBuilder(completeString);
    int start_index = 0;

    //if matchCase is true, match exact string
    if (matchCase) {
        if (TextUtils.isEmpty(targetStringToFormat) || !completeString.contains(targetStringToFormat)) {
            return str;
        }

        start_index = str.toString().indexOf(targetStringToFormat);
    } else {
        //else find in lower cases
        if (TextUtils.isEmpty(targetStringToFormat) || !completeString.toLowerCase().contains(targetStringToFormat.toLowerCase())) {
            return str;
        }

        start_index = str.toString().toLowerCase().indexOf(targetStringToFormat.toLowerCase());
    }

    int end_index = start_index + targetStringToFormat.length();
    str.setSpan(new StyleSpan(BOLD), start_index, end_index, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    return str;
}

如。completeString = "I am BOLD"

情况下,我 if *targetStringToFormat* = "bold" and *matchCase* = true

返回“I am BOLD”(因为BOLD != BOLD)

案例二世 if *targetStringToFormat* = "bold" and *matchCase* = false

返回“I am BOLD”

应用:

myTextView.setText(formatAStringPortionInBold("I am BOLD", "bold", false))

希望有帮助!

我创建了一个静态方法来设置文本粗体的TextView和EditText部分

public static void boldPartOfText(View mView, String contentData, int startIndex, int endIndex){
        if(!contentData.isEmpty() && contentData.length() > endIndex) {
            final SpannableStringBuilder sb = new SpannableStringBuilder(contentData);

            final StyleSpan bss = new StyleSpan(Typeface.BOLD); // Span to make text bold
            final StyleSpan iss = new StyleSpan(Typeface.NORMAL); //Span to make text normal
            sb.setSpan(iss, 0, startIndex, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
            sb.setSpan(bss, startIndex, endIndex, Spannable.SPAN_INCLUSIVE_INCLUSIVE); // make first 4 characters Bold
            sb.setSpan(iss,endIndex, contentData.length()-1, Spanned.SPAN_INCLUSIVE_INCLUSIVE);

            if(mView instanceof TextView)
               ((TextView) mView).setText(sb);
            else if(mView instanceof EditText)
               ((EditText) mView).setText(sb);

        }
    }

另一个更定制的代码

  /*typeFaceStyle can be passed as 

    Typeface.NORMAL = 0;
    Typeface.BOLD = 1;
    Typeface.ITALIC = 2;
    Typeface.BOLD_ITALIC = 3;*/

    public static void boldPartOfText(View mView, String contentData, int startIndex, int endIndex,int typeFaceStyle){
        if(!contentData.isEmpty() && contentData.length() > endIndex) {
            final SpannableStringBuilder sb = new SpannableStringBuilder(contentData);

            final StyleSpan bss = new StyleSpan(typeFaceStyle); // Span to make text bold
            final StyleSpan iss = new StyleSpan(Typeface.NORMAL); //Span to make text italic
            sb.setSpan(iss, 0, startIndex, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
            sb.setSpan(bss, startIndex, endIndex, Spannable.SPAN_INCLUSIVE_INCLUSIVE); // make first 4 characters Bold
            sb.setSpan(iss,endIndex,contentData.length()-1,Spanned.SPAN_INCLUSIVE_INCLUSIVE);

            if(mView instanceof TextView)
                ((TextView) mView).setText(sb);
            else if(mView instanceof EditText)
                ((EditText) mView).setText(sb);
        }
    }

我来这里是为了提供一个最新的解决方案，因为我对现有的答案不满意。 我需要一些可以用于翻译文本的东西，并且没有使用Html.fromHtml()的性能影响。 如果您正在使用Kotlin，这里有一个扩展函数，可以轻松地将文本的多个部分设置为粗体。这就像Markdown一样工作，如果需要，可以扩展到支持其他Markdown标签。

val yourString = "**This** is your **string**.".makePartialTextsBold()
val anotherString = getString(R.string.something).makePartialTextsBold()

/**
 * This function requires that the parts of the string that need
 * to be bolded are wrapped in ** and ** tags
 */
fun String.makePartialTextsBold(): SpannableStringBuilder {
    var copy = this
    return SpannableStringBuilder().apply {
        var setSpan = true
        var next: String
        do {
            setSpan = !setSpan
            next = if (length == 0) copy.substringBefore("**", "") else copy.substringBefore("**")
            val start = length
            append(next)
            if (setSpan) {
                setSpan(StyleSpan(Typeface.BOLD), start, length,
                        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            }
            copy = copy.removePrefix(next).removePrefix("**")
        } while (copy.isNotEmpty())
    }
}

这里有一个更好的解决方案，如果你想使多个文本粗体。我改进了Eitan的代码。谢谢你搞清楚。

public static SpannableStringBuilder makeSectionOfTextBold(String text, String... textToBold) {
    SpannableStringBuilder builder = new SpannableStringBuilder(text);

    for (String textItem :
            textToBold) {
        if (textItem.length() > 0 && !textItem.trim().equals("")) {
            //for counting start/end indexes
            String testText = text.toLowerCase(Locale.US);
            String testTextToBold = textItem.toLowerCase(Locale.US);
            int startingIndex = testText.indexOf(testTextToBold);
            int endingIndex = startingIndex + testTextToBold.length();

            if (startingIndex >= 0 && endingIndex >= 0) {
                builder.setSpan(new StyleSpan(Typeface.BOLD), startingIndex, endingIndex, 0);
            }
        }
    }

    return builder;
}