core/res/res/drawable/chooser_direct_share_icon_placeholder.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
    Copyright (C) 2019 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.
-->
<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
                 xmlns:aapt="http://schemas.android.com/aapt">
    <aapt:attr name="android:drawable">
        <vector xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:aapt="http://schemas.android.com/aapt"
                android:width="36dp"
                android:height="36dp"
                android:viewportHeight="64"
                android:viewportWidth="64">

            <group android:name="background">
                <path android:pathData="M0,0 L 64,0 64,64 0,64 z"
                      android:fillColor="@color/chooser_gradient_background"/>
            </group>

            <!-- Gradient starts offscreen so it is not visible in the first frame before start -->
            <group android:name="gradient" android:translateX="-128">
                <path
                    android:pathData="M0,0 L 128,0 128,128 0,128 z">
                    <aapt:attr name="android:fillColor">
                        <gradient
                            android:type="linear"
                            android:startX="0"
                            android:endX="128"
                            android:startY="0"
                            android:endY="0">
                            <item
                                android:color="@android:color/transparent"
                                android:offset="0.0" />
                            <item
                                android:color="@color/chooser_gradient_highlight"
                                android:offset="0.5" />
                            <item
                                android:color="@android:color/transparent"
                                android:offset="1.0" />
                        </gradient>
                    </aapt:attr>
                </path>
            </group>

            <!-- Use a foregroud with a cutout shape matching direct share inset for appx applied
                 shadow. Using clip-path is a more elegant solution but leaves awful jaggies around
                 the path's shape. -->
            <group android:name="cover">
                <path android:fillColor="?attr/colorBackgroundFloating"
                      android:pathData="M0,0 L64,0 L64,64 L0,64 L0,0 Z M59.0587325,42.453601 C60.3124932,39.2104785 61,35.6855272 61,32 C61,15.9837423 48.0162577,3 32,3 C15.9837423,3 3,15.9837423 3,32 C3,48.0162577 15.9837423,61 32,61 C35.6855272,61 39.2104785,60.3124932 42.453601,59.0587325 C44.3362195,60.2864794 46.5847839,61 49,61 C55.627417,61 61,55.627417 61,49 C61,46.5847839 60.2864794,44.3362195 59.0587325,42.453601 Z"/>
            </group>
        </vector>
    </aapt:attr>

    <!-- This AVD uses special properties so that once started it will loop infinitely with no
         need for callbacks to restart. -->
    <target android:name="gradient">
        <aapt:attr name="android:animation">
            <objectAnimator
                android:duration="1700"
                android:pathData="M -128,0 L 192,0"
                android:propertyXName="translateX"
                android:repeatMode="restart"
                android:repeatCount="infinite"
                android:startOffset="0">
                <aapt:attr name="android:interpolator">
                    <pathInterpolator android:pathData="M 0.0,0.0 c0.167,0.167 0.833,0.833 1.0,1.0" />
                </aapt:attr>
            </objectAnimator>
        </aapt:attr>
    </target>
</animated-vector>