app/src/main/res/drawable/ic_downarrow.xml
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="48dp"
android:height="48dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
<group>
<path android:name="square"
android:fillColor="#CCFF6F00"
android:pathData="M2,12
A10,10 0 1,1 22,12
A10,10 0 1,1 2,12" />
<path android:fillColor="#FF000000"
android:pathData="M20,12l-1.41,-1.41L13,16.17V4h-2v12.17l-5.58,-5.59L4,12l8,8 8,-8z"/>
</group>
</vector>