单击项目时，底部导航没有导航

Question

我创建了两个作为片段的NavController的活动，我不确定这是正确的方法。

对于MyActivity，底部导航工作正常并显示片段。但是对于mainActivityRelawan，当我按下返回按钮后，单击项目时，主菜单没有导航，我不知道为什么显示片段。

main_activity用于控制主活动片段，main_activity_relawan用于控制主要活动Relawan片段。

这是我的mainActivityRelawan

 val navController = findNavController(R.id.nav_host_fragment_activity_main_relawan)
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        val appBarConfiguration = AppBarConfiguration(
            setOf(
                R.id.navigation_home_relawan, R.id.navigation_dashboard, R.id.navigation_notifications
            )
        )
        setupActionBarWithNavController(navController, appBarConfiguration)
        navView.setupWithNavController(navController)

，这是我的mainActivity

val navController = findNavController(R.id.nav_host_fragment_activity_main)
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        val appBarConfiguration = AppBarConfiguration(
            setOf(
                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications
            )
        )
        setupActionBarWithNavController(navController, appBarConfiguration)
        navView.setupWithNavController(navController)

，对于findnavcontroller i的每个活动，我都使用不同的活动xml和不同的navgraph 这是我的mainActivity findNavController

<com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment_activity_main"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:navGraph="@navigation/mobile_navigation" />

，这是我的mainActivitivitivityRelawan navcontroller

<com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view_relawan"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment_activity_main_relawan"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view_relawan"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/navigation_relawan" />

，我对每个纳维尔图都使用了不同的navgraph。这是navigationgraph mainActivity

 <fragment
        android:id="@+id/navigation_home"
        android:name="com.example.tes.ui.home.HomeFragment"
        android:label="@string/title_home"
        tools:layout="@layout/fragment_home" />

    <fragment
        android:id="@+id/navigation_dashboard"
        android:name="com.example.tes.ui.dashboard.DashboardFragment"
        android:label="@string/title_dashboard"
        tools:layout="@layout/fragment_dashboard" />

    <fragment
        android:id="@+id/navigation_notifications"
        android:name="com.example.tes.ui.notifications.NotificationsFragment"
        android:label="@string/title_notifications"
        tools:layout="@layout/fragment_notifications" />

，这是navgraph mainActivityRelawan

<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/navigation_relawan"
    app:startDestination="@+id/navigation_home_relawan">


    <fragment
        android:id="@+id/navigation_home_relawan"
        android:name="com.example.tes.ui.home_relawan.RelawanFragment"
        android:label="@string/title_home"
        tools:layout="@layout/fragment_main_relawan" >
        <action
            android:id="@+id/action_navigation_home_relawan_to_navigation_dashboard"
            app:destination="@id/navigation_dashboard" />
    </fragment>

    <fragment
        android:id="@+id/navigation_dashboard"
        android:name="com.example.tes.ui.dashboard.DashboardFragment"
        android:label="@string/title_dashboard"
        tools:layout="@layout/fragment_dashboard" >
        <action
            android:id="@+id/action_navigation_dashboard_to_navigation_notifications"
            app:destination="@id/navigation_notifications" />
    </fragment>

    <fragment
        android:id="@+id/navigation_notifications"
        android:name="com.example.tes.ui.notifications.NotificationsFragment"
        android:label="@string/title_notifications"
        tools:layout="@layout/fragment_notifications" >

    </fragment>



</navigation>

Answer 1

解决了，这是因为我为菜单底部导航制作了不同的ID

Answer 2

我在一项活动中使用了它。我不知道这是好的。因此，您可以在我的