Android custom shape for zoom buttons
<p>I'm a bit new with Android UI but I would like to know what is the best way to archive something like this? The only icon I have is 'plus' and 'minus'.</p>

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

<p>Is there a way with a custom drawable shape to build this 'half circle' shape? (So it would be two shape so that 'plus' and 'minus' are two different actions</p>