refresh 的動畫效果

<rotate xmlns:android="http://schemas.android.com/apk/res/android"
        android:interpolator="@android:anim/linear_interpolator"
        android:fromDegrees="0"
        android:toDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%"
        android:duration="1000"
        android:repeatCount="infinite"
        android:repeatMode="restart"
        />