Material design BusyIndicator

[RudolfVonKrugstein]

Hey,

I am trying to implement a BusyIndicator following the material design here: https://www.materialup.com/posts/material-design-circular-progress-indicator or here: https://material-design.storage.googleapis.com/publish/material_v_4/material_ext_publish/0B6Okdz75tqQsemFpeElQMFBSMG8/061101_Circular_Sheet_xhdpi_004.webm

But I already fail at drawing a circle arc.

So what is the way to do this?

Thanks!
Nathan