Hint or alert inside Android app
<p>Apologies for the rough sketch.
Basically I want, the first time the user opens the app, is to draw their attention to a button and have some text like "You can click me for more information!" or something like that.</p>

<p>Does anyone know what this is called? Is there a name for this sort of thing - and can it be done in native Android or would I need a third party library? Thanks</p>

<p><a href="https://i.stack.imgur.com/emjIE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/emjIE.png" alt="enter image description here"></a></p>