Day137 — navigation component

This records things I learn about navigation component during a project.

Pass arguments

Fragment A -> Fragment B

and pass data

Be notice that although the above code having the arguments declared in the action tag of the source fragment (FragmentA), i.e. @id/fragment_a_to_b. There is not a must to declare arguments passing from source to target fragment. You can simply declare the wanted arguments inside the target fragment tag. e.g.

<fragment
    android:id="@+id/fragment_b"
    android:name="com.jacky.testnavigationcomponent.FragmentB"
    android:label="FragmentB"
    tools:layout="@layout/fragment_b">
    <argument
        android:name="argString"
        app:nullable="false" />
</fragment>

SafeArgs can pick up the argument and generate proper class that you can use in target fragment, i.e. FragmentB.

private val argsParams by navArgs<FragmentBArgs>()

You can find the whole project in GitHub

jacky-ttt/TestNavigationComponent

ProGuard

Pass data between destinations | Android Developers