<?xml version="1.0" encoding="utf-8"?>
  
  <rotate xmlns:android="http://schemas.android.com/apk/res/android"
          android:fromDegrees="0"
          android:pivotX="50%"
          android:pivotY="50%"
          android:duration="1"
          android:toDegrees="360" >
  
      <shape
          android:innerRadiusRatio="2.5"
          android:shape="ring"
          android:thicknessRatio="18"
          android:useLevel="false" >
          <gradient
              android:centerColor="#a0a0a0a0"
              android:centerY="0.5"
              android:endColor="#f0f0f0"
              android:startColor="#40404040"
              android:type="sweep"/>
      </shape>
  
  </rotate>