packages/SystemUI/res/drawable/ic_qs_cast_connecting.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
 * Copyright 2013, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
-->
<animation-list
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:oneshot="false">
    <item android:drawable="@drawable/ic_qs_cast_connecting_0" android:duration="500" />
    <item android:drawable="@drawable/ic_qs_cast_connecting_1" android:duration="500" />
    <item android:drawable="@drawable/ic_qs_cast_connecting_2" android:duration="500" />
    <item android:drawable="@drawable/ic_qs_cast_connecting_1" android:duration="500" />
</animation-list>