How to set `null` as the default value for a nullable argument using SafeArgs?

Question

How should I pass in null as default value for a String argument such as this:

<argument
    android:name="profile_id"
    android:defaultValue="???"
    app:argType="string"
    app:nullable="true" />

If the argument is nullable there should be a way to pass in null right?

score 113 · Answer 1 · answered Dec 06 '18 at 23:52

113

Turns out the good old @null works

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

answered Dec 06 '18 at 23:52

Kayvan N

8

Filed [this documentation issue](https://issuetracker.google.com/issues/120627532) to ensure that this is mentioned in the official documentation. – ianhanniballake Dec 07 '18 at 00:00
So you can't pass literal `@null` :| – Sourav Kannantha B Nov 02 '21 at 16:44
1

according to @ianhanniballake comment - as of October 2022 - this way is allowed in official docs https://developer.android.com/guide/navigation/navigation-pass-data#supported_argument_types – Grzegorz Dev Oct 19 '22 at 13:34

1 Answers1