res/drawable/ic_welcome_ripple_anim.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2015 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_welcome_ripple_000" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_001" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_002" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_003" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_004" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_005" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_006" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_007" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_008" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_009" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_010" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_011" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_012" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_013" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_014" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_015" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_016" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_017" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_018" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_019" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_020" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_021" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_022" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_023" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_024" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_025" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_026" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_027" android:duration="33" />
    <item android:drawable="@drawable/ic_welcome_ripple_028" android:duration="33" />
    <!-- Once the last frame is drawn, 1 sec interval is given before repetition. -->
    <item android:drawable="@drawable/ic_welcome_ripple_029" android:duration="1033" />
</animation-list>