Build an Android App with Views

[hogansung]

In case someone encounters an error of "Preview Unavailable" when visualizing the EntryDialogFragment component in the design mode of nav_graph.xml, one needs to add tools:layout="@layout/fragment_entry_dialog" to the dialog component of entryDialogFragment.

To be more precise, the full code for that entryDialogFragment in the nav_graph.xml should be the following.

<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    // ...
    <dialog
        android:id="@+id/entryDialogFragment"
        android:name="com.example.juicetracker.EntryDialogFragment"
        android:label="EntryDialogFragment"
        tools:layout="@layout/fragment_entry_dialog" >    <!-- This line is critical. -->
    </dialog>
</navigation>