<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false">
    <item
        android:drawable="@drawable/anim_loading_1"
        android:duration="300" />
    <item
        android:drawable="@drawable/anim_loading_2"
        android:duration="300" />
    <item
        android:drawable="@drawable/anim_loading_3"
        android:duration="300" />
    <item
        android:drawable="@drawable/anim_loading_4"
        android:duration="300" />
    <item
        android:drawable="@drawable/anim_loading_5"
        android:duration="300" />
</animation-list>