It's a progressbar UI component that looks similar to the android L progress bar (material design).
'com.hannesdorfmann:circleprogressview:1.0.2'
<dependency>
<groupId>com.hannesdorfmann</groupId>
<artifactId>circleprogressview</artifactId>
<version>1.0.2</version>
</dependency>
<dependency org="com.hannesdorfmann" name="circleprogressview" rev="1.0.2"/>
"com.hannesdorfmann", "circleprogressview", "1.0.2"