android 圆形进度条（旋转的等待动画）

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:toDegrees="360">
    <shape android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="8"
        android:useLevel="false">
        <gradient android:centerColor="@color/color_orange"
            android:centerY="0.5"
            android:endColor="@color/white"
            android:useLevel="false"/>
    shape>

rotate>

设置成progressBarStyleSmall后，图标变小。　

设置成progressBarStyleLarge后，图标变大