I have the following situation: I have an app with one activity and many fragments. The fragments are swapped in and out using the NavHostFragment in the activity layout.
The common views that all fragments are sharing (e.g. CoordinatorLayout , AppBarLayout, CollapsingToolbar, Toolbar etc.) are also located in the activity layout. Some of the fragment layouts has views like RecyclerView and FloatingActionBar.
This is how it looks like:
In the .gif file, you can see that FloatingActionButton is behind the BottomNavigationBar. Only when the user scrolls down, the FloatingActionButton is shown completely to the user. What I want is that they should be able to see the button completely even when they are not scrolling down. (Note that the RecyclerView has no items because I wanted to keep the focus on the button. The behavior of the button is the same with items.)
This is how my activity_main.xml looks like :
<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.drawerlayout.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
tools:openDrawer="start">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/coordinator_layout"
android:layout_width="0dp"
android:layout_height="0dp"
android:fitsSystemWindows="true"
app:layout_constraintBottom_toTopOf="@id/bottom_nav_view"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="@style/Theme.AndroidApp.AppBarOverlay">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="@+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|snap"
app:toolbarId="@id/toolbar">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
style="@style/Widget.MaterialComponents.Toolbar.Primary"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:contentInsetStart="0dp"
app:layout_collapseMode="parallax">
<TextView
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:gravity="center"
android:text="@string/app_name"
android:textAppearance="?attr/textAppearanceHeadline5" />
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<fragment
android:id="@+id/myNavHostFragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
app:defaultNavHost="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/navigation" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_nav_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="@id/coordinator_layout"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/bottom_nav_menu" />
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header"
app:itemIconTint="@drawable/drawer_item_color"
app:itemTextColor="@drawable/drawer_item_color"
app:menu="@menu/drawer_actions" />
</androidx.drawerlayout.widget.DrawerLayout>
</layout>
And this is the layout of one of my Fragments:
<layout xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="viewModel"
type="com.example.androidapp.ItemsFragmentViewModel"/>
</data>
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/list_items"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/progress_bar"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ProgressBar
android:id="@+id/progress_bar"
style="?android:attr/progressBarStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/add_item"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/fab_margin"
android:src="@drawable/ic_create"
android:onClick="@{() -> viewModel.create()}"
app:fabSize="normal"
app:layout_anchor="@id/list_items"
app:layout_anchorGravity="bottom|right|end"
tools:ignore="ContentDescription" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</layout>
Maybe I messed the activity layout a little bit, I do not know. Everything works, only the FloatingActionButton destroys it. Can someone help ?
Thanks in advance
