In case if you are asking about the circle image > Just showing a circle image on that view In case how it actually shows the wifi name My guess I think they are using android Wifi Direct API to get the list of devices When the user tap receive, they would make the wifi direct available with encoded image as string (along with name or other apis don't know if there is something to populate along with wifi direct scan available) From the scanning device, it will list the available device and decode string to image so it can show the image without connect to the network. It's my guess.
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