Android: show a list of options when a user presses the scroll (arrow) button
<p>I would like to implement a UI, so a user can press a scroll button and a list of options will be shown on the screen. Otherwose the list is hidden and in the textview ony the default option is displayed.</p>

<p>Can someone shed some light on how to do this please? I tried to do some research but suspect I didn't know the keywords, so my reserach so far is in vain.</p>

<p>Thank you in advance.</p>
