尝试通过java代码设置你的TextView样式

txt1.setTypeface(null,Typeface.BOLD_ITALIC);

在AndroidX中使用简化标签时，请考虑使用HtmlCompat.fromHtml()

String s = "<b>Bolded text</b>, <i>italic text</i>, even <u>underlined</u>!"    
TextView tv = (TextView)findViewById(R.id.THE_TEXTVIEW_ID);
tv.setText(HtmlCompat.fromHtml(s, FROM_HTML_MODE_LEGACY));

试着在TextView上设置粗体或斜体

textView.setTypeface(textView.getTypeface(), Typeface.BOLD);
textView.setTypeface(textView.getTypeface(), Typeface.ITALIC);
textView.setTypeface(textView.getTypeface(), Typeface.BOLD_ITALIC);

TextView text = (TextView)findViewById(R.layout.textName);
text.setTypeface(null,Typeface.BOLD);

尝试通过java代码设置你的TextView样式

txt1.setTypeface(null,Typeface.BOLD_ITALIC);

在我的例子中:

1 -设置文本

2 -设置字体

holder.title.setText(item.nome);
holder.title.setTypeface(null, Typeface.BOLD);