As such, if a component specifies an Intent filter, it is assumed that you want the component to be accessed by other apps and it is, by default, exported and thus public.
If, however, no Intent filter is specified for a component, the only way to send an Intent
to it is to fully specify the component’s class name.
Therefore, it is assumed that you do not want to make this component publicly accessible, so the default exported is false and the component is private.