how to give dark background to white icon so icon stands out against a light image?

Question

How can I add a dark, transparent background to a white icon so that the icon can be clearly seen when it's superimposed on a photo of any colour?

I got the icon from the Material design icons here so it comes in a variety of sizes. I'd rather not have to edit the icons if possible.

Here's a nice example from the built-in camera app of 2 icons standing out against a light background image. In my case the background doesn't have to be a circle. A squircle is fine too but preferably not a square. The background shape doesn't have to have a border like the ones below.

Answer 1

 <selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="#40000000"/>
            
            <!--corners allow us to make the rounded corners -->
            <corners android:radius="15dp" />
        </shape>
    </item>
    </selector>

Add this XML file to your drawable. 8 digit color code #40000000 is AARRGGBB, the first two-digit(for alpha) controls opacity, you can change 40 to as per your need. So you to set this drawable file as background of image and set icon in src property.