google-material-design-icons/android/action/expand/materialiconsround/black/res/drawable/round_expand_24.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M5,20h14c0.55,0 1,0.45 1,1v0c0,0.55 -0.45,1 -1,1H5c-0.55,0 -1,-0.45 -1,-1v0C4,20.45 4.45,20 5,20zM5,2h14c0.55,0 1,0.45 1,1v0c0,0.55 -0.45,1 -1,1H5C4.45,4 4,3.55 4,3v0C4,2.45 4.45,2 5,2zM13,9h1.79c0.45,0 0.67,-0.54 0.35,-0.85l-2.79,-2.79c-0.2,-0.2 -0.51,-0.2 -0.71,0L8.85,8.15C8.54,8.46 8.76,9 9.21,9H11v6H9.21c-0.45,0 -0.67,0.54 -0.35,0.85l2.79,2.79c0.2,0.2 0.51,0.2 0.71,0l2.79,-2.79c0.31,-0.31 0.09,-0.85 -0.35,-0.85H13V9z"/>
</vector>