string.xml
<string name="exchange_txt_hint"><Data><![CDATA[请使用<font color="#ff0000"><b>%1$s</b></font>牛兑换<font color="#ff0000"><b>%2$s</b></font>%3$s 上网时长]]></Data></string>
java文件中置入对应%1$s的参数方法：一共有3个参数 String.valueOf(wifiCardType.needCoin) wifiCardType.timeNumber "小时 " + curClickedProviderSSID
String exchange = getString(R.string.exchange_txt_hint,String.valueOf(wifiCardType.needCoin), wifiCardType.timeNumber, "小时 " + curClickedProviderSSID);
exchange_txtView.setText(Html.fromHtml(exchange));