BottomNavigationView with navgraph loading fragment again

问题

I am using BottomNavigationView with nav-graph Below is my code

InMainActivity.class

navController = Navigation.findNavController(this, R.id.mainFragment);

    bottomNavigation.setOnNavigationItemSelectedListener(menuItem -> {
        switch (menuItem.getItemId()){
            case R.id.home:
                navController.navigate(R.id.exploreFragment);
                return true;
            case R.id.events:
                navController.navigate(R.id.eventsFragment);
                return true;
            case R.id.stories:
                navController.navigate(R.id.storiesFragment);
                return true;
        }
        return false;
    });

activity_main.xml

<fragment
    android:id="@+id/mainFragment"
    app:defaultNavHost="true"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintBottom_toTopOf="@+id/bottomNavigation"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:navGraph="@navigation/nav_home"/>

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:layout_width="match_parent"
    app:itemIconTint="@drawable/bottom_navigation_color"
    app:itemTextColor="@drawable/bottom_navigation_color"
    android:background="@color/grey_50"
    android:id="@+id/bottomNavigation"
    app:menu="@menu/bottom_navigation"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    android:layout_height="wrap_content"/>

<include
    layout="@layout/toolbar"
    android:id="@+id/toolbar"/>

nav_home.xml

<fragment
    android:id="@+id/exploreFragment"
    android:name="com.decathlon.allforsport.home.explore.ExploreFragment"
    tools:layout="@layout/fragment_explore" />
<fragment
    android:id="@+id/eventsFragment"
    android:name="com.decathlon.allforsport.home.events.EventsFragment"
    tools:layout="@layout/fragment_stories" />
<fragment
    android:id="@+id/storiesFragment"
    android:name="com.decathlon.allforsport.home.stories.StoriesFragment"
    tools:layout="@layout/fragment_stories" />

So problem is when I tap on Home in BottomNavigationView, it reloads the fragment again and again. I tried many ways, but no success.

回答1:

Since you are using navigation controller, you can remove setOnNavigationItemSelectedListener function.

In bottom_navigation menu, make sure you define the item id same as the id you defined in nav graph.

And you need those code to make the bottom navigation bar works

setupActionBarWithNavController(navController!!)
bottomNavigation.setupWithNavController(navController!!)

Edit

For androidx

NavigationUI.setupWithNavController(bottomNavigation, 
Navigation.findNavController(this, R.id.mainFragment))

来源：https://stackoverflow.com/questions/55178578/bottomnavigationview-with-navgraph-loading-fragment-again

标签

android

kotlin

bottomnavigationview

androidx