如果你正在使用Kotlin，使用core-ktx会变得更容易，因为它提供了一种领域特定语言(DSL)来做这件事:

val string: SpannedString = buildSpannedString {
    bold {
        append("foo")
    }
    append("bar")     
}

它提供的更多选项有:

append("Hello There")
bold {
    append("bold")
    italic {
        append("bold and italic")
        underline {
            append("then some text with underline")
        }
    }
}

最后，你只需:

textView.text = string

字符串资源

<resources>
   <string name="your_string_resource_name">This is normal text<![CDATA[<b> but this is bold </b>]]> and <![CDATA[<u> but this is underline text</u>]]></string>
</resources> 

您的Java类

yourtextView.setText(getString(R.string.your_string_resource_name));

如果你想使用XML中的字符串，你可以这样做:

xml(“CDATA”部分很重要，否则它将不起作用)

<string name="test">
     <![CDATA[
 <b>bold!</b> normal
    ]]>
</string>

布局文件

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="center" />

</FrameLayout>

code

textView.text = HtmlCompat.fromHtml(getString(R.string.test), HtmlCompat.FROM_HTML_MODE_LEGACY)

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);
        }
    }

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

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())
    }
}