sheishuoAPP/uikit/res-ptr2/drawable/sample_footer_loading_progress.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <rotate
            android:drawable="@drawable/sample_footer_loading"
            android:duration="500"
            android:fromDegrees="0.0"
            android:pivotX="50.0%"
            android:pivotY="50.0%"
            android:toDegrees="360.0" />
    </item>

</layer-list>