如何在 android-导航库中隐藏 BottomNavigationView
how to hide BottomNavigationView on android-navigation lib
我正在尝试在我的 APP 中使用 android-navigation 库，并且按照教程中的说明进行操作。我只想在我的 APP 中使用一个单曲 activity。我对一个问题感到困惑。一些不想要 BottomNavigationView 的片段，我该如何隐藏它。
这是我的 main_layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp"
android:theme="@style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:fitsSystemWindows="true"
app:popupTheme="@style/AppTheme.PopupOverlay" >
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<fragment
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
app:defaultNavHost="true"
app:navGraph="@navigation/carkeeper_navigation"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/menu_bottom_nav"
app:itemTextColor="@color/bottom_nav_title_color_selector"
app:itemIconSize="@dimen/x40"
app:menu="@menu/menu_main_bottom_nav"
app:labelVisibilityMode="labeled">
</com.google.android.material.bottomnavigation.BottomNavigationView>
这是我的 mainActivity
class MainActivity : BaseActivity() {
private lateinit var navController: NavController
private lateinit var bottomNavigationView: BottomNavigationView
private lateinit var appBarConfiguration: AppBarConfiguration
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.home_activity)
navController = Navigation.findNavController(this, R.id.nav_host_fragment)
appBarConfiguration = AppBarConfiguration(navController.graph, null)
setSupportActionBar(findViewById(R.id.toolbar))
bottomNavigationView = findViewById(R.id.menu_bottom_nav)
bottomNavigationView.setupWithNavController(navController)
bottomNavigationView.itemIconTintList = null
}}
然后 navigaton_graph
<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/carkeeper_navigation"
app:startDestination="@id/mainFragment">
<fragment
android:id="@+id/mainFragment"
android:name="com.saicfinance.carkeeper.func.main.MainFragment"
android:label="MainFragment"
tools:layout="@layout/home_fragment">
</fragment>
<fragment
android:id="@+id/mineFragment"
android:name="com.saicfinance.carkeeper.func.mine.MineFragment"
android:label="@string/mine_title"
tools:layout="@layout/mine_fragment" >
<action android:id="@+id/action_mine_fragment_to_setting_fragment"
app:destination="@id/settingFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right"/>
</fragment>
<fragment
android:id="@+id/settingFragment"
android:name="com.freddy.func.setting.SettingFragment"
android:label="setting_fragment"
tools:layout="@layout/setting_fragment" />
我知道我可以在导航到 settingFragment 时将 BottomNavigationView 设置为消失。然后在回到我的片段时将 BottomNavigationView 设置为可见。但这很奇怪。任何可以帮助我的人，在此先感谢。
您可以在 activity 的 onCreate 中执行类似的操作。当导航栏中的项目被选中时，它会根据片段 ID 显示或隐藏导航。
private fun setupNav() {
val navController = findNavController(R.id.nav_host_fragment)
findViewById<BottomNavigationView>(R.id.bottomNav)
.setupWithNavController(navController)
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.mainFragment -> showBottomNav()
R.id.mineFragment -> showBottomNav()
else -> hideBottomNav()
}
}
}
private fun showBottomNav() {
bottomNav.visibility = View.VISIBLE
}
private fun hideBottomNav() {
bottomNav.visibility = View.GONE
}
@Samuel Grogan 的回答是正确的，但是如果你遇到设备旋转时底部导航 shows/hides 意外的问题，你可以使用 ViewModel 来解决这个问题：
MainViewModel
class MainViewModel : ViewModel() {
private val _bottomNavigationVisibility = MutableLiveData<Int>()
val bottomNavigationVisibility: LiveData<Int>
get() = _bottomNavigationVisibility
init {
showBottomNav()
}
fun showBottomNav() {
_bottomNavigationVisibility.postValue(View.VISIBLE)
}
fun hideBottomNav() {
_bottomNavigationVisibility.postValue(View.GONE)
}
}
MainActivity
class MainActivity : AppCompatActivity() {
private lateinit var mainViewModel: MainViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mainViewModel = ViewModelProvider(this).get(MainViewModel::class.java)
val bottomNav: BottomNavigationView = findViewById(R.id.nav_view)
val navController = findNavController(R.id.nav_host_fragment)
bottomNav.setupWithNavController(navController)
mainViewModel.bottomNavigationVisibility.observe(this, Observer { navVisibility ->
bottomNav.visibility = navVisibility
})
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.comment_fragment -> mainViewModel.hideBottomNav()
else -> mainViewModel.showBottomNav()
}
}
}
}
接受的答案有效，它是官方文档中推荐的答案，但正如评论中所述，它确实会导致一些闪烁，因为回调是在附加片段之前执行的。
我发现下面的答案更灵活，并且可以更好地处理动画：
supportFragmentManager.registerFragmentLifecycleCallbacks(object : FragmentManager.FragmentLifecycleCallbacks() {
override fun onFragmentViewCreated(fm: FragmentManager, f: Fragment, v: View, savedInstanceState: Bundle?) {
TransitionManager.beginDelayedTransition(binding.root, Slide(Gravity.BOTTOM).excludeTarget(R.id.nav_host_fragment, true))
when (f) {
is ModalFragment -> {
binding.bottomNavigation.visibility = View.GONE
}
else -> {
binding.bottomNavigation.visibility = View.VISIBLE
}
}
}
}, true)
您可以根据片段之间的过渡对其进行自定义，方法是选择不同的动画（在我的示例中是幻灯片），或者在另一个生命周期回调中进行调用。
官方 Android 网站上有一个解决方案：
https://developer.android.com/guide/navigation/navigation-ui
navController.addOnDestinationChangedListener { _, destination, _ ->
if(destination.id == R.id.full_screen_destination) {
toolbar.visibility = View.GONE
bottomNavigationView.visibility = View.GONE
} else {
toolbar.visibility = View.VISIBLE
bottomNavigationView.visibility = View.VISIBLE
}
}
是的，这取决于。我按照 android.dev 上的指南说的那样做了。主 activity 布局的顶部是工具栏，中间是片段根容器，底部是底部导航视图。当我隐藏底部导航时，它每次都会在任何片段上调整大小。现在我明白我需要多个导航图，我需要不同的根容器来存放有或没有 navigation/toolbar
的片段
回复晚了，但我认为这很好用。
import android.animation.ValueAnimator
import android.graphics.drawable.BitmapDrawable
import android.view.View
import android.view.ViewGroup
import android.view.animation.AnimationUtils
import androidx.core.animation.doOnEnd
import androidx.core.view.drawToBitmap
import com.google.android.material.bottomnavigation.BottomNavigationView
import com.google.android.material.snackbar.Snackbar
/**
* Potentially animate showing a [BottomNavigationView].
*
* Abruptly changing the visibility leads to a re-layout of main content, animating
* `translationY` leaves a gap where the view was that content does not fill.
*
* Instead, take a snapshot of the view, and animate this in, only changing the visibility (and
* thus layout) when the animation completes.
*/
fun BottomNavigationView.show() {
if (visibility == View.VISIBLE) return
val parent = parent as ViewGroup
// View needs to be laid out to create a snapshot & know position to animate. If view isn't
// laid out yet, need to do this manually.
if (!isLaidOut) {
measure(
View.MeasureSpec.makeMeasureSpec(parent.width, View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(parent.height, View.MeasureSpec.AT_MOST)
)
layout(parent.left, parent.height - measuredHeight, parent.right, parent.height)
}
val drawable = BitmapDrawable(context.resources, drawToBitmap())
drawable.setBounds(left, parent.height, right, parent.height + height)
parent.overlay.add(drawable)
ValueAnimator.ofInt(parent.height, top).apply {
startDelay = 100L
duration = 300L
interpolator = AnimationUtils.loadInterpolator(
context,
android.R.interpolator.linear_out_slow_in
)
addUpdateListener {
val newTop = it.animatedValue as Int
drawable.setBounds(left, newTop, right, newTop + height)
}
doOnEnd {
parent.overlay.remove(drawable)
visibility = View.VISIBLE
}
start()
}
}
/**
* Potentially animate hiding a [BottomNavigationView].
*
* Abruptly changing the visibility leads to a re-layout of main content, animating
* `translationY` leaves a gap where the view was that content does not fill.
*
* Instead, take a snapshot, instantly hide the view (so content lays out to fill), then animate
* out the snapshot.
*/
fun BottomNavigationView.hide() {
if (visibility == View.GONE) return
val drawable = BitmapDrawable(context.resources, drawToBitmap())
val parent = parent as ViewGroup
drawable.setBounds(left, top, right, bottom)
parent.overlay.add(drawable)
visibility = View.GONE
ValueAnimator.ofInt(top, parent.height).apply {
startDelay = 100L
duration = 200L
interpolator = AnimationUtils.loadInterpolator(
context,
android.R.interpolator.fast_out_linear_in
)
addUpdateListener {
val newTop = it.animatedValue as Int
drawable.setBounds(left, newTop, right, newTop + height)
}
doOnEnd {
parent.overlay.remove(drawable)
}
start()
}
}
现在我们只需要使用lifecycleScope。
lifecycleScope.launchWhenResumed {
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.home, R.id.booking, R.id.profile -> navigationView.show()
else -> navigationView.hide()
}
}
}
处理此问题的最佳方法是在没有刷新故障的情况下也没有 ViewModel 是在 when 条件之后调用 setupWithNavController 方法。
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.dashboardFragment, R.id.globalParamsFragment, R.id.managementFragment
-> {
binding.bottomNavigation.visible()
binding.fabAdd.visible()
}
else -> {
binding.bottomNavigation.gone()
binding.fabAdd.gone()
}
}
}
NavigationUI.setupWithNavController(binding.bottomNavigation, navController)
我已经这样做了，而且效果很好。
PreferenceFragmentCompat
覆盖 PreferenceFragmentCompat 的 LifeCycle 方法。
class MySettingsFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.root_preferences, rootKey)
}
// Called when the Fragment is visible to the user.
override fun onStart() {
super.onStart()
val mainActivity = activity as MainActivity
mainActivity.setBottomNavigationVisibility(View.GONE)
}
// Called when the Fragment is no longer started.
override fun onStop() {
super.onStop()
val mainActivity = activity as MainActivity
mainActivity.setBottomNavigationVisibility(View.VISIBLE)
}
}
// Toggle the visibility of BottomNavigationView in MainActivity.kt.
fun setBottomNavigationVisibility(visibility: Int) {
binding.bottomNav.visibility = visibility
}
我正在尝试在我的 APP 中使用 android-navigation 库，并且按照教程中的说明进行操作。我只想在我的 APP 中使用一个单曲 activity。我对一个问题感到困惑。一些不想要 BottomNavigationView 的片段，我该如何隐藏它。 这是我的 main_layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp"
android:theme="@style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:fitsSystemWindows="true"
app:popupTheme="@style/AppTheme.PopupOverlay" >
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<fragment
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
app:defaultNavHost="true"
app:navGraph="@navigation/carkeeper_navigation"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/menu_bottom_nav"
app:itemTextColor="@color/bottom_nav_title_color_selector"
app:itemIconSize="@dimen/x40"
app:menu="@menu/menu_main_bottom_nav"
app:labelVisibilityMode="labeled">
</com.google.android.material.bottomnavigation.BottomNavigationView>
这是我的 mainActivity
class MainActivity : BaseActivity() {
private lateinit var navController: NavController
private lateinit var bottomNavigationView: BottomNavigationView
private lateinit var appBarConfiguration: AppBarConfiguration
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.home_activity)
navController = Navigation.findNavController(this, R.id.nav_host_fragment)
appBarConfiguration = AppBarConfiguration(navController.graph, null)
setSupportActionBar(findViewById(R.id.toolbar))
bottomNavigationView = findViewById(R.id.menu_bottom_nav)
bottomNavigationView.setupWithNavController(navController)
bottomNavigationView.itemIconTintList = null
}}
然后 navigaton_graph
<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/carkeeper_navigation"
app:startDestination="@id/mainFragment">
<fragment
android:id="@+id/mainFragment"
android:name="com.saicfinance.carkeeper.func.main.MainFragment"
android:label="MainFragment"
tools:layout="@layout/home_fragment">
</fragment>
<fragment
android:id="@+id/mineFragment"
android:name="com.saicfinance.carkeeper.func.mine.MineFragment"
android:label="@string/mine_title"
tools:layout="@layout/mine_fragment" >
<action android:id="@+id/action_mine_fragment_to_setting_fragment"
app:destination="@id/settingFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right"/>
</fragment>
<fragment
android:id="@+id/settingFragment"
android:name="com.freddy.func.setting.SettingFragment"
android:label="setting_fragment"
tools:layout="@layout/setting_fragment" />
我知道我可以在导航到 settingFragment 时将 BottomNavigationView 设置为消失。然后在回到我的片段时将 BottomNavigationView 设置为可见。但这很奇怪。任何可以帮助我的人，在此先感谢。
您可以在 activity 的 onCreate 中执行类似的操作。当导航栏中的项目被选中时，它会根据片段 ID 显示或隐藏导航。
private fun setupNav() {
val navController = findNavController(R.id.nav_host_fragment)
findViewById<BottomNavigationView>(R.id.bottomNav)
.setupWithNavController(navController)
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.mainFragment -> showBottomNav()
R.id.mineFragment -> showBottomNav()
else -> hideBottomNav()
}
}
}
private fun showBottomNav() {
bottomNav.visibility = View.VISIBLE
}
private fun hideBottomNav() {
bottomNav.visibility = View.GONE
}
@Samuel Grogan 的回答是正确的，但是如果你遇到设备旋转时底部导航 shows/hides 意外的问题，你可以使用 ViewModel 来解决这个问题：
MainViewModel
class MainViewModel : ViewModel() {
private val _bottomNavigationVisibility = MutableLiveData<Int>()
val bottomNavigationVisibility: LiveData<Int>
get() = _bottomNavigationVisibility
init {
showBottomNav()
}
fun showBottomNav() {
_bottomNavigationVisibility.postValue(View.VISIBLE)
}
fun hideBottomNav() {
_bottomNavigationVisibility.postValue(View.GONE)
}
}
MainActivity
class MainActivity : AppCompatActivity() {
private lateinit var mainViewModel: MainViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mainViewModel = ViewModelProvider(this).get(MainViewModel::class.java)
val bottomNav: BottomNavigationView = findViewById(R.id.nav_view)
val navController = findNavController(R.id.nav_host_fragment)
bottomNav.setupWithNavController(navController)
mainViewModel.bottomNavigationVisibility.observe(this, Observer { navVisibility ->
bottomNav.visibility = navVisibility
})
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.comment_fragment -> mainViewModel.hideBottomNav()
else -> mainViewModel.showBottomNav()
}
}
}
}
接受的答案有效，它是官方文档中推荐的答案，但正如评论中所述，它确实会导致一些闪烁，因为回调是在附加片段之前执行的。
我发现下面的答案更灵活，并且可以更好地处理动画：
supportFragmentManager.registerFragmentLifecycleCallbacks(object : FragmentManager.FragmentLifecycleCallbacks() {
override fun onFragmentViewCreated(fm: FragmentManager, f: Fragment, v: View, savedInstanceState: Bundle?) {
TransitionManager.beginDelayedTransition(binding.root, Slide(Gravity.BOTTOM).excludeTarget(R.id.nav_host_fragment, true))
when (f) {
is ModalFragment -> {
binding.bottomNavigation.visibility = View.GONE
}
else -> {
binding.bottomNavigation.visibility = View.VISIBLE
}
}
}
}, true)
您可以根据片段之间的过渡对其进行自定义，方法是选择不同的动画（在我的示例中是幻灯片），或者在另一个生命周期回调中进行调用。
官方 Android 网站上有一个解决方案：
https://developer.android.com/guide/navigation/navigation-ui
navController.addOnDestinationChangedListener { _, destination, _ ->
if(destination.id == R.id.full_screen_destination) {
toolbar.visibility = View.GONE
bottomNavigationView.visibility = View.GONE
} else {
toolbar.visibility = View.VISIBLE
bottomNavigationView.visibility = View.VISIBLE
}
}
是的，这取决于。我按照 android.dev 上的指南说的那样做了。主 activity 布局的顶部是工具栏，中间是片段根容器，底部是底部导航视图。当我隐藏底部导航时，它每次都会在任何片段上调整大小。现在我明白我需要多个导航图，我需要不同的根容器来存放有或没有 navigation/toolbar
的片段回复晚了，但我认为这很好用。
import android.animation.ValueAnimator
import android.graphics.drawable.BitmapDrawable
import android.view.View
import android.view.ViewGroup
import android.view.animation.AnimationUtils
import androidx.core.animation.doOnEnd
import androidx.core.view.drawToBitmap
import com.google.android.material.bottomnavigation.BottomNavigationView
import com.google.android.material.snackbar.Snackbar
/**
* Potentially animate showing a [BottomNavigationView].
*
* Abruptly changing the visibility leads to a re-layout of main content, animating
* `translationY` leaves a gap where the view was that content does not fill.
*
* Instead, take a snapshot of the view, and animate this in, only changing the visibility (and
* thus layout) when the animation completes.
*/
fun BottomNavigationView.show() {
if (visibility == View.VISIBLE) return
val parent = parent as ViewGroup
// View needs to be laid out to create a snapshot & know position to animate. If view isn't
// laid out yet, need to do this manually.
if (!isLaidOut) {
measure(
View.MeasureSpec.makeMeasureSpec(parent.width, View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(parent.height, View.MeasureSpec.AT_MOST)
)
layout(parent.left, parent.height - measuredHeight, parent.right, parent.height)
}
val drawable = BitmapDrawable(context.resources, drawToBitmap())
drawable.setBounds(left, parent.height, right, parent.height + height)
parent.overlay.add(drawable)
ValueAnimator.ofInt(parent.height, top).apply {
startDelay = 100L
duration = 300L
interpolator = AnimationUtils.loadInterpolator(
context,
android.R.interpolator.linear_out_slow_in
)
addUpdateListener {
val newTop = it.animatedValue as Int
drawable.setBounds(left, newTop, right, newTop + height)
}
doOnEnd {
parent.overlay.remove(drawable)
visibility = View.VISIBLE
}
start()
}
}
/**
* Potentially animate hiding a [BottomNavigationView].
*
* Abruptly changing the visibility leads to a re-layout of main content, animating
* `translationY` leaves a gap where the view was that content does not fill.
*
* Instead, take a snapshot, instantly hide the view (so content lays out to fill), then animate
* out the snapshot.
*/
fun BottomNavigationView.hide() {
if (visibility == View.GONE) return
val drawable = BitmapDrawable(context.resources, drawToBitmap())
val parent = parent as ViewGroup
drawable.setBounds(left, top, right, bottom)
parent.overlay.add(drawable)
visibility = View.GONE
ValueAnimator.ofInt(top, parent.height).apply {
startDelay = 100L
duration = 200L
interpolator = AnimationUtils.loadInterpolator(
context,
android.R.interpolator.fast_out_linear_in
)
addUpdateListener {
val newTop = it.animatedValue as Int
drawable.setBounds(left, newTop, right, newTop + height)
}
doOnEnd {
parent.overlay.remove(drawable)
}
start()
}
}
现在我们只需要使用lifecycleScope。
lifecycleScope.launchWhenResumed {
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.home, R.id.booking, R.id.profile -> navigationView.show()
else -> navigationView.hide()
}
}
}
处理此问题的最佳方法是在没有刷新故障的情况下也没有 ViewModel 是在 when 条件之后调用 setupWithNavController 方法。
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.dashboardFragment, R.id.globalParamsFragment, R.id.managementFragment
-> {
binding.bottomNavigation.visible()
binding.fabAdd.visible()
}
else -> {
binding.bottomNavigation.gone()
binding.fabAdd.gone()
}
}
}
NavigationUI.setupWithNavController(binding.bottomNavigation, navController)
我已经这样做了，而且效果很好。
PreferenceFragmentCompat
覆盖 PreferenceFragmentCompat 的 LifeCycle 方法。
class MySettingsFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.root_preferences, rootKey)
}
// Called when the Fragment is visible to the user.
override fun onStart() {
super.onStart()
val mainActivity = activity as MainActivity
mainActivity.setBottomNavigationVisibility(View.GONE)
}
// Called when the Fragment is no longer started.
override fun onStop() {
super.onStop()
val mainActivity = activity as MainActivity
mainActivity.setBottomNavigationVisibility(View.VISIBLE)
}
}
// Toggle the visibility of BottomNavigationView in MainActivity.kt.
fun setBottomNavigationVisibility(visibility: Int) {
binding.bottomNav.visibility = visibility
}