带有导航组件的 BottomNavBar 没有响应

如何解决带有导航组件的 BottomNavBar 没有响应

所以我使用带有菜单项的导航组件来创建一个底部导航栏。但是，当我完全运行无错误代码并且菜单项完全没有响应时，就会出现问题。它只停留在一个 Fragment 中，点击时不会导航到其他 Fragment。

这是navhost片段所在的活动：

class HomeActivity : AppCompatActivity() {

private lateinit var navController: NavController
private val binding: ActivityHomeBinding by lazy {
    ActivityHomeBinding.inflate(layoutInflater)
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(binding.root)
    setUpBottomNavigation()
}

private fun setUpBottomNavigation() {
    val navHostFragment =
        supportFragmentManager.findFragmentById(R.id.fragmentContainerView) as NavHostFragment
    navController = navHostFragment.findNavController()
    binding.bottomNavigation.setupWithNavController(navController)

}

}

这里是xml：

<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Home.HomeActivity">

<androidx.fragment.app.FragmentContainerView
    android:id="@+id/fragmentContainerView"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="409dp"
    android:layout_height="673dp"
    app:defaultNavHost="true"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:navGraph="@navigation/nav_graph_without_splash" />

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="411dp"
    android:layout_height="wrap_content"
    android:visibility="visible"
    app:backgroundTint="@color/lightGray"
    app:elevation="8dp"
    app:itemIconTint="@color/bottom_nav_tint"
    app:itemTextColor="@color/bottom_nav_tint"
    app:labelVisibilityMode="labeled"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:menu="@menu/bottom_menu" />

这里是菜单项.xml：

<menu xmlns:android="http://schemas.android.com/apk/res/android">

<item
    android:id="@+id/start2"
    android:title="Home"
    android:icon="@drawable/ic_home"/>

<item
    android:id="@+id/data"
    android:title="Data"
    android:icon="@drawable/ic_baseline_mms_24"/>

<item
    android:id="@+id/profile"
    android:title="Profile"
    android:icon="@drawable/ic_profile"/>

解决方法

首先在您的活动文件中执行此操作

class LoginFragment : Fragment() {
private var _binding: FragmentLoginBinding? = null
private val binding get() = _binding!!

override fun onCreateView(
    inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
): View? {
    _binding = FragmentLoginBinding.inflate(inflater,container,false)

    binding.tohomepagebutton.setOnClickListener {

        /*
        since you are using nav graph instead of using intents to switch between activities,you can invoke the actions on the navgraph to navigate to the preferred destination
         to understand better check https://medium.com/swlh/android-navigation-component-part-1-6191323eaf39
         https://developer.android.com/guide/navigation/navigation-getting-started*/

        NavHostFragment.findNavController(this).navigate(R.id.action_loginFragment_to_home2)

    }

    return binding.root

}

override fun onDestroyView() {
    super.onDestroyView()
    _binding = null
}

}