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写个style
<style name="myProgressBarStyleLarge">
<item name="android:indeterminateDrawable">@anim/progress_round</item>
<item name="android:minWidth">54dip</item>
<item name="android:maxWidth">54dip</item>
<item name="android:minHeight">54dip</item>
<item name="android:maxHeight">54dip</item>
</style>
再在progressbar中style引入这个style。注意图片的尺寸最好和设置一致,