@志杰張 I see now what you are referencing. For me, I use the following plugins which allow much more control over the whole process:
These allow significant control over icons, stacking, background services, etc.
EDIT: Also, that folder just needs to be added to your platforms folder, because it is there when you build. If you use LocalKit or Cloud IDE, under Build Config -> Android App Settings: you can add your icons with the appropriate resolution. You may be able to upload the noticon at the same time.