CODEWITHSUNDEEP
androidandroid-studioandroid-architecture-navigationandroid-jetpack-navigation
Wavecycle
Wavecycle

Reputation: 183

NavHostFragment vs FragmentContainerView [Android]

Hi there I'm going through the guides for navigation on the developer Android site, and I followed the instructions to create a NavHostFragment:

<fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"

        app:defaultNavHost="true"
        app:navGraph="@navigation/nav_graph" />

However when that code is there the IDE suggests that I replace the NavHostFragment with FragmentContainerView.

What is the difference and when should they each be used rather than the other?

Thank you

Upvotes: 6

Views: 5550

Answers (2)

Gabriele Mariotti
Gabriele Mariotti

Reputation: 363647

The FragmentContainerView is a customized Layout designed specifically as the container for Fragments. The NavHostFragment is responsible for swapping destinations in the Navigation component.

You can use:

<fragment
    android:id="@+id/nav_host_fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    app:navGraph="@navigation/xxxxx"
    app:defaultNavHost="true"

    ..>

and:

val navController = findNavController(R.id.nav_host_fragment)

Or you can use:

<androidx.fragment.app.FragmentContainerView
    android:id="@+id/nav_host_fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    app:navGraph="@navigation/xxxx"
    app:defaultNavHost="true"

    ..>

with:

    val navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
    val navController = navHostFragment.navController

Upvotes: 11

MustafaKhaled
MustafaKhaled

Reputation: 1489

If you explore the source code of FragmentContainerView, you will find it extends FrameLayout.

FragmentContainerView includes all features found in Framelayout, with some added features in Fragment Transition and etc..

Note: FragmentContainerView replaces <FrameLayout> and <fragment> not NavHostFragment.

To know more about FragmentContainerView, kindly check this article.

I hope this would help.

Upvotes: 2

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