无法将按钮文字设置为“ <<<”

这些是html实体，也可以在android studio中使用：

> can be replaced with &gt;< can be replaced with &lt;" can be replaced with &quot;, &ldquo; or &rdquo;' can be replaced with &apos;, &lsquo; or &rsquo;} can be replaced with &#125;& can be replaced with &amp;space can be replaced with &#160;