zumo_2.0_android/app/src/main/res/drawable/icon_plus_banner.xml

<vector android:height="18dp" android:viewportHeight="104"
        android:viewportWidth="104" android:width="18dp" xmlns:android="http://schemas.android.com/apk/res/android">
  <path android:fillColor="#00000000" android:fillType="evenOdd"
        android:pathData="M52,2L52,2A50,50 0,0 1,102 52L102,52A50,50 0,0 1,52 102L52,102A50,50 0,0 1,2 52L2,52A50,50 0,0 1,52 2z"
        android:strokeColor="#FFF" android:strokeWidth="4"/>
  <path android:fillColor="#00000000" android:fillType="nonZero"
        android:pathData="M34,52h36M52,34v36" android:strokeColor="#FFF" android:strokeWidth="4"/>
</vector>