<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android" 
    android:pivotX="50%"
    android:pivotY="50%"
    android:fromDegrees="0"
    android:toDegrees="360">
    
   <shape android:shape="ring" 
             android:innerRadiusRatio="3" 
          android:thicknessRatio="8" 
          android:useLevel="false">  

    <gradient 
        android:type="sweep" 
        android:useLevel="false" 
         android:startColor="@android:color/black" 
         android:centerColor="@android:color/black" 
        android:centerY="0.50" 
        android:endColor="@android:color/black" />  
  </shape>
</rotate>