When one first creates a new project, that dialog lets you point to some external .PNG file, and then when that dialog completes, it generates 4 different pixel-sizes of ima
Just in case anyone else visits this post I thought I'd describe what I did.
Right click on res folder > New image asset
browser to the icon. Click next
By default the icon goes to src/debug/res- keep this
In the project hierarchy, browse to src/debug/res and copy the files from the drawable* directories to the same directories in src/main and src/main
copy the src/debug/res/icon_name.png to the src/main and src/release directories