res/anim/on_going_call.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2017 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_ongoing_phone_24px_01"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_02"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_03"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_04"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_05"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_06"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_07"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_08"
    android:duration="200"/>
  <item
    android:drawable="@drawable/ic_ongoing_phone_24px_09"
    android:duration="200"/>
</animation-list>