在Android上隐藏底部导航视图
我正在开发一款遵循单一活动模式的Android应用程序。在我的一个片段中，我有一个RecyclerView，如果用户向下滚动，我想隐藏我的BottomNavigationView 我已经看过其他关于这件事的帖子，但似乎没有一篇对我的问题有帮助。到目前为止，我已经尝试创建底部导航视图和我的主机片段协调布局，并在我的底部导航视图中添加了在Android上隐藏底部导航视图,android,kotlin,android-recyclerview,material-design,android-bottomnav,Android,Kotlin,Android Recyclerview,Material Design,Android Bottomnav,我正在开发一款遵循单一活动模式的Android应用程序。在我的一个片段中，我有一个RecyclerView，如果用户向下滚动，我想隐藏我的BottomNavigationView 我已经看过其他关于这件事的帖子，但似乎没有一篇对我的问题有帮助。到目前为止，我已经尝试创建底部导航视图和我的主机片段协调布局，并在我的底部导航视图中添加了app:layout\u behavior=“com.google.android.material.behavior.hidebottomviewonsrollbo
app:layout\u behavior=“com.google.android.material.behavior.hidebottomviewonsrollbource”<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.MainActivity">
<fragment
android:id="@+id/fragmentMaster"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toTopOf="@id/bottomNav"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/nav_graph" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottomNav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/menu_bottom_nav">
</com.google.android.material.bottomnavigation.BottomNavigationView>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.appbar.MaterialToolbar
android:id="@+id/topAppBar"
style="@style/Widget.MaterialComponents.Toolbar.Primary"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll"
app:title="@string/app_name" />
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:scrollbars="none"
app:layout_scrollFlags="scroll">
<com.google.android.material.chip.ChipGroup
android:id="@+id/filterChips"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
app:singleLine="true">
<com.google.android.material.chip.Chip
android:id="@+id/breakfastChip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checkable="true"
android:text="@string/breakfast" />
<com.google.android.material.chip.Chip
android:id="@+id/mealChip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checkable="true"
android:text="@string/meal" />
<com.google.android.material.chip.Chip
android:id="@+id/dinnerChip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checkable="true"
android:text="@string/dinner" />
<com.google.android.material.chip.Chip
android:id="@+id/veganChip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checkable="true"
android:text="@string/vegan" />
<com.google.android.material.chip.Chip
android:id="@+id/vegetarianChip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checkable="true"
android:text="@string/vegetarian" />
<com.google.android.material.chip.Chip
android:id="@+id/regularChip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checkable="true"
android:text="@string/regular" />
</com.google.android.material.chip.ChipGroup>
</HorizontalScrollView>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recipeList"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:listitem="@layout/item_recipe_list">
</androidx.recyclerview.widget.RecyclerView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/newRecipeBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:contentDescription="@string/add_recipe"
android:src="@drawable/ic_baseline_add_24">
</com.google.android.material.floatingactionbutton.FloatingActionButton>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</layout>
private fun RecyclerSetting(view: View) {
no_value = view.findViewById(R.id.no_values_assigned_message)
rvItem = view.findViewById(R.id.rvServices)
rvItem!!.setHasFixedSize(true)
//Very IMP This Line
val manager = GridLayoutManager(activity, 2,
GridLayoutManager.VERTICAL,
false)
data
rvItem!!.setLayoutManager(manager)
}
NavigationViewBehavior.ktimport android.view.View
import androidx.coordinatorlayout.widget.CoordinatorLayout
import androidx.core.view.ViewCompat
import androidx.core.view.ViewCompat.NestedScrollType
import com.google.android.material.bottomnavigation.BottomNavigationView
class NavigationViewBehavior : CoordinatorLayout.Behavior<BottomNavigationView>() {
private var height = 0
override fun onLayoutChild(parent: CoordinatorLayout, child: BottomNavigationView, layoutDirection: Int): Boolean {
height = child.height
return super.onLayoutChild(parent, child, layoutDirection)
}
override fun onStartNestedScroll(coordinatorLayout: CoordinatorLayout,
child: BottomNavigationView, directTargetChild: View, target: View,
axes: Int, type: Int): Boolean {
return axes == ViewCompat.SCROLL_AXIS_VERTICAL
}
override fun onNestedScroll(coordinatorLayout: CoordinatorLayout, child: BottomNavigationView,
target: View, dxConsumed: Int, dyConsumed: Int,
dxUnconsumed: Int, dyUnconsumed: Int,
@NestedScrollType type: Int) {
if (dyConsumed > 0) {
slideDown(child)
} else if (dyConsumed < 0) {
slideUp(child)
}
}
private fun slideUp(child: BottomNavigationView) {
child.clearAnimation()
child.animate().translationY(0f).duration = 200
}
private fun slideDown(child: BottomNavigationView) {
child.clearAnimation()
child.animate().translationY(height.toFloat()).duration = 200
}
}
val navController = Navigation.findNavController(this,
R.id.nav_host_fragment)
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration!!)
NavigationUI.setupWithNavController(navView!!, navController)
val layoutParams = navView!!.getLayoutParams() as CoordinatorLayout.LayoutParams
layoutParams.behavior = NavigationViewBehavior()
val params = frameLayout.layoutParams as ViewGroup.MarginLayoutParams
//hide bottom navigation no need while sun activities are being used
navController.addOnDestinationChangedListener { controller: NavController?,
destination: NavDestination, arguments: Bundle? ->
if (destination.id == R.id.navigation_fragments ) {
params.setMargins(0, 0, 0, 0)
frameLayout.layoutParams = params
navView!!.setVisibility(View.GONE)
} else {
params.setMargins(0, 0, 0, 160)
frameLayout.layoutParams = params
navView!!.setVisibility(View.VISIBLE)
}
}
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rvServices"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:visibility="visible" />
<TextView
android:id="@+id/no_values_assigned_message"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:text="@string/no_values_assigned"
android:textSize="@dimen/fontSizeReg"
android:textStyle="bold"
android:visibility="gone" />
</androidx.constraintlayout.widget.ConstraintLayout>
在添加行为后，滚动“回收器视图”时，您可以自动隐藏“自动隐藏”，也可以隐藏“特定片段”的底部导航。现在，使包含回收器视图的片段的父片段具有嵌套的滚动视图…这将解决问题issue@unownsp你的意思是包装衣服协调我的片段与NestedScrollView的布局？我已将代码更改为与您的代码相同，但它没有任何作用，我真的不知道为什么。奇怪的是，当我调试NavigationBehavior类时，onLayoutChild被调用，但onNestedScroll从未被调用。此代码对我有效。请检查您已更改的所有代码，认为丢失或未交叉验证您的代码，您需要检查丢失的位置您可以显示包含RecyclerView的xml文件吗？好的@tinerfinha
private fun RecyclerSetting(view: View) {
no_value = view.findViewById(R.id.no_values_assigned_message)
rvItem = view.findViewById(R.id.rvServices)
rvItem!!.setHasFixedSize(true)
//Very IMP This Line
val manager = GridLayoutManager(activity, 2,
GridLayoutManager.VERTICAL,
false)
data
rvItem!!.setLayoutManager(manager)
}