Overview

The NavHostFragment provides a NavHost suitable for using Fragments as destinations in your navigation graphs via <fragment> elements. Navigating to a Fragment will replace the contents of the NavHostFragment.

Below is a minimal implementation.

 // File: res/xml/main_navigation.xml
 <navigation xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     app:startDestination="@+id/home_fragment">
   <fragment android:id="@+id/home_fragment"
       android:name="com.example.HomeFragment">
     <action android:id="@+id/details"
       app:destination="@+id/details_fragment" />
   </fragment>
   <fragment android:id="@+id/details_fragment"
       android:name="com.example.DetailsFragment"/>
 <navigation />

 // File: activity_main.xml
 <fragment
   android:id="@+id/my_nav_host_fragment"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:name="androidx.navigation.fragment.NavHostFragment"
   app:navGraph="@xml/main_navigation"
   app:defaultNavHost="true"
 />

 // File: HomeFragment.java
 public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
   // For example purposes, assume our layout created in onCreateView has a Button
   // that should navigate the user to a destination
   Button button = view.findViewById(R.id.view_details);

   // Retrieve the NavController from any Fragment created by a NavHostFragment by passing in
   // this
   final NavController navController = NavHostFragment.findNavController(this);
   // Alternatively, retrieve the NavController from any View within the NavHostFragment
   final NavController viewNavController = Navigation.findNavController(button);

   // And set the listener
   button.setOnClickListener(() -> navController.navigate(R.id.details));

   // Or use the convenience method in Navigation to combine all of the previous steps
   button.setOnClickListener(Navigation.createNavigateOnClickListener(R.id.details));
 }
 

Classes