插值器为线性匀速
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/linear_interpolator">
<rotate
android:pivotX="50%"
android:pivotY="50%"
android:duration="5000"
android:fromDegrees="0"
android:toDegrees="359"
android:repeatMode="restart"
android:repeatCount="-1"/>
</set>
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