google-material-design-icons/android/file/folder/materialiconsround/black/res/drawable/round_folder_20.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="20dp"
    android:height="20dp"
    android:viewportWidth="20"
    android:viewportHeight="20"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M10,6L8.44,4.44C8.16,4.16 7.78,4 7.38,4H3.5C2.67,4 2,4.67 2,5.5v9C2,15.33 2.67,16 3.5,16h13c0.83,0 1.5,-0.67 1.5,-1.5v-7C18,6.67 17.33,6 16.5,6H10z"/>
</vector>