Android Contextual menu (similar to music app)
<p>I would like to create a contextual menu for a listview similar to the one used by the google play music app in the listviews. (see screenshot. The triangle buttons open the menu for the album. and then one can select different options depending on the selected item.) But I've also seen this element in other apps.</p>

<p><a href="https://lh5.ggpht.com/IvSpTcmdyUOC9GoX-x528xAzy9jEPjWCLcNcru4CBEcUNZ-YHo0y2TQHcGmuvOQ2zg" rel="nofollow">https://lh5.ggpht.com/IvSpTcmdyUOC9GoX-x528xAzy9jEPjWCLcNcru4CBEcUNZ-YHo0y2TQHcGmuvOQ2zg</a></p>

<p>The Problem is that I neither know how to implement the triangle button correctly (is that just a normal imagebutton?) nor do I know how to open that popup window for each entry.</p>

<p>One approach I tried was using a spinner. But the problem is that the spinner always was as wide as the longest element in it and not just the triangle. Otherwise this would be a good solution. Is there a way to set the spinner to a smaller size and hide the horizontal line beneath it?</p>

<p>Or would a spinner be the complete wrong approach and I should solve this problem differently?</p>
