IssueTracker

Component used: Navigation
Version used: 1.0.0-rc02

When using a Fragment such as:

<fragment>
  ...
  <argument
    android:name="myArg"
    app:argType="string"
    app:nullable="true"
    android:defaultValue="@null"/>
</fragment>

The defaultValue="@null" causes that attribute to be dropped by the NavInflater (due to now XmlPullParser works), meaning the resulting arguments Bundle can be null as there is no way to distinguish between no default value being set and a null default value being set.

Unfortunately, even in the case where no arguments are required, Safe Args' fromBundle() and, by extension, the by navArgs(), require a non-null Bundle.

fromBundle() should only throw on a null Bundle if there are required values.