Develop Reference

Coordinator layout - collapsing content interaction with recycler view

schema
As shown in the picture, I want my 2 views ( recycler view and collapsing content ) to be responding only to the middle grip bar ( it could be 50dp height constraint layout - for example )
Moving this bar should collapse the upper part - and make recyclerview change its height. The bar shouldn't be able to move lower than the upper part content. Recycler view should be able to scroll independently all the time.
How to make only restricted area respond to touch events?
How to make recyclerview height depend on grip position ?
Now in my case, the collapsing part is getting hidden just after i start scrolling recyclerview.
If there is not enough information, I'll add whatever required.
Code:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/activityToDo"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.ToDoActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsingToolbar"
app:layout_scrollFlags="scroll|enterAlways"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.constraintlayout.widget.ConstraintLayout
app:layout_collapseMode="parallax"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:hint="Note title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/noteTitle"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="10dp"
app:layout_constraintEnd_toStartOf="#+id/guideline"
android:layout_marginEnd="10dp"
android:layout_marginTop="15dp"
android:textSize="15sp"
android:inputType="text" app:layout_constraintTop_toTopOf="parent"/>
<EditText
android:hint="Note priority"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/notePriority"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="10dp"
app:layout_constraintStart_toStartOf="#+id/guideline"
android:layout_marginStart="10dp"
android:layout_marginTop="15dp"
android:textSize="15sp"
android:inputType="number" app:layout_constraintTop_toTopOf="parent"/>
<androidx.constraintlayout.widget.Guideline
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintGuide_begin="197dp"
android:id="#+id/guideline"/>
<EditText
android:hint="Note description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/noteDescription"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="10dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="10dp"
app:layout_constraintTop_toBottomOf="#+id/notePriority"
android:layout_marginTop="20dp"
android:textSize="15sp"/>
<Button
android:text="Save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/saveButton"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="10dp"
app:layout_constraintEnd_toStartOf="#+id/guideline" android:layout_marginEnd="10dp"
android:layout_marginBottom="20dp" app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginTop="10dp" app:layout_constraintTop_toBottomOf="#+id/noteDescription"/>
<Button
android:text="Clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/clearButton"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="10dp" app:layout_constraintStart_toStartOf="#+id/guideline"
android:layout_marginStart="10dp" android:layout_marginBottom="20dp"
app:layout_constraintBottom_toBottomOf="parent" android:layout_marginTop="10dp"
app:layout_constraintTop_toBottomOf="#+id/noteDescription"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.appbar.CollapsingToolbarLayout>
<TextView
android:text="All notes"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</com.google.android.material.appbar.AppBarLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/allNotesRecyclerView"
android:layout_marginStart="8dp"
app:layout_constraintTop_toTopOf="#id/collapsingToolbar"
android:layout_marginTop="16dp"
android:textSize="15sp"/>
</LinearLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
GitHub Repo

in my case like this :
add app:layout_behavior="#string/appbar_scrolling_view_behavior" on your recyclerview and look my CollapsingToolbarLayout and my Toolbar
<androidx.coordinatorlayout.widget.CoordinatorLayout 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/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".myactivity.DetailWisataActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar_detail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapse_toolbar_detail"
android:layout_width="match_parent"
android:layout_height="200dp"
android:fitsSystemWindows="true"
app:contentScrim="?colorPrimary"
app:expandedTitleGravity="center_horizontal|bottom"
app:layout_scrollFlags="scroll|snap|exitUntilCollapsed">
<ImageView
android:id="#+id/img_bg_detail"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="#string/app_name"
android:scaleType="centerCrop"
android:src="#drawable/bg_beach"
app:layout_collapseMode="pin"
tools:targetApi="m" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorTransparantBlackLow" />
<ProgressBar
android:id="#+id/progress_detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar_detail"
android:layout_width="match_parent"
android:layout_height="#dimen/actionBarSizeLow"
android:theme="#style/ThemeOverlay.AppCompat.Light"
app:layout_collapseMode="pin"
app:title="#string/info_wisata" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
............Your recyclerview here.......
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</androidx.coordinatorlayout.widget.CoordinatorLayout>
and remove your Linearlayout.

Fisrt remove your LinearLayout from parent of recyclerview and try this:
<androidx.coordinatorlayout.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<!-- HEADER -->
<RelativeLayout
...
app:layout_collapseMode="parallax">
.....
</RelativeLayout>
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
<!-- IF YOU WANT TO KEEP "Choose Item" always on top of the RecyclerView, put this TextView here
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="choose item" />
-->
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Same question answer: Link

With the newest version of Android Studio (4.0 Canary 9), you can use the new MotionLayout layout type to transition between different ConstraintLayouts. The simplest solution (below) wouldn't necessarily let you change the RecyclerView height to whatever you wanted, but you could smoothly transition between two different layouts when the user swipes up or down.
In short, you would do the following:
In your build.gradle (Module: app) file, add the following line:
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta4'
Create a new ConstraintLayout layout file that determines how all of your views should be arranged at the beginning
Convert that ConstraintLayout to a MotionLayout using the right-click menu in the layout editor
In the MotionLayout editor, add constraints to each view in the "start" and "end" layouts
In the new MotionScene XML file that was added to the XML folder in your res folder, edit the tag to look like this:
<Transition
motion:constraintSetEnd="#+id/end"
motion:constraintSetStart="#id/start"
>
<OnSwipe
app:touchAnchorSide="top"
motion:touchAnchorId="#id/YOUR_GRIP_VIEW"
motion:dragDirection="dragUp" />
<KeyFrameSet>
</KeyFrameSet>
</Transition>
* In the MotionLayout Codelab, it says to use app:touchAnchorID instead of motion:touchAnchorId but that didn't work for me *
Now, when you swipe your grip view up or down, the MotionLayout can transition between states.

Shared Content overlapping Bottom Navigation

My MainActivity's got a RecyclerView and a BottomNavigationView. Items in the RecyclerView are CardViews.
When I click an item that's halfway obscured by the BottomNavigationView (- will call it BNV), it "pops" over the BNV, then slides up to become the header in LaunchedActivity.
When backing out of LaunchedActivity, it slides down, over the BNV, then "snaps" back into place:
How can I either:
Have the shared content appear to slide from underneath the BNV,
or failing that,
Have the shared content start off invisible, and fade as it slides to the header
I've tried playing with the elevation of the BNV, I've tried setting sharedElementEnterTransition to Fade(), I've tried specifying excludeTarget with BottomNavigation; I can't seem to make things work how I'd like.
Here's the layout for MainActivity:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/bottomNavigationView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottomNavigationView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="#menu/navigation"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
/>
</android.support.constraint.ConstraintLayout>
Activity_launched is here:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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=".LaunchedActivity">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay"/>
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_launched"/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#android:drawable/ic_dialog_email"/>
</android.support.design.widget.CoordinatorLayout>
And content_launched:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_launched"
tools:context=".LaunchedActivity">
<LinearLayout
android:id="#+id/launched_header"
android:transitionName="header" android:layout_width="0dp" android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
android:orientation="vertical" app:layout_constraintEnd_toEndOf="parent"
android:background="#android:color/holo_blue_bright"
android:layout_marginEnd="8dp">
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:id="#+id/launched_title"/>
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:id="#+id/launched_text"/>
</LinearLayout>
</android.support.constraint.ConstraintLayout>
Items in the RecyclerView call MainActivity.onItemClicked:
fun onItemClicked(view: View, item: Item) {
val intent = Intent(applicationContext, LaunchedActivity::class.java)
intent.putExtra("ITEM", item)
val options = ActivityOptions.makeSceneTransitionAnimation(
this,
android.util.Pair<View, String>(view, "header")
)
startActivity(intent, options.toBundle())
}
This is the array that's in the recycler:
data class Item(val title: String, val text: String): Serializable
val itemList = listOf(Item("One", "1"), Item("Two", "2"),
Item("Three", "3"), Item("Four", "4"), Item("Five", "5"))
Lastly, this is from LaunchedActivity.onCreate:
with(window) {
requestFeature(Window.FEATURE_CONTENT_TRANSITIONS)
requestFeature(Window.FEATURE_ACTIVITY_TRANSITIONS)
sharedElementEnterTransition = AutoTransition()
sharedElementExitTransition = AutoTransition()
}
LaunchedActivity.onCreate pulls the item out of the intent and sets launched_title and launched_text.

Add in recyclerView's item's CardView
app:cardMaxElevation="8dp"
and give your BNV
app:elevation="16dp"
give it a try, try with more difference in elevation as clicked cardview has more elevation than actual elevation

Have you heard of clipToPadding it can add padding to the bottom views so it does not obstruct the bottom views.
So try setting clipToPadding = "true" and check if it solves.
Android what does the clipToPadding Attribute do?
Also your layout activity file has <RecyclerView> set to 0dp.
Use a <RelativeLayout> outside and set layout_above="#bnv" in <RecyclerView> somewhat similar to this.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/navigation1"
android:layout_weight="1">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<com.nxtoff.plzcome.commonutills.BottomNavigationViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<View
android:layout_width="match_parent"
android:layout_height="0.5dp"
android:layout_below="#+id/viewpager"
android:background="#999999" />
</RelativeLayout>
</FrameLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/navigation1"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:background="?android:attr/windowBackground"
app:itemBackground="#android:color/white"
app:itemIconTint="#drawable/nav_item_colors"
app:itemTextColor="#drawable/nav_item_colors"
app:menu="#menu/navigation" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/xfb_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_gravity="bottom|center_horizontal"
android:layout_margin="22dp"
android:layout_marginBottom="30dp"
android:background="#color/colorloader"
android:clickable="true"
android:src="#drawable/plus_fab"
android:tint="#color/colorviolet"
app:backgroundTint="#color/colorloader"
app:elevation="8dp"
app:fabSize="normal"
/>
</RelativeLayout>
EDIT 1:
Try out this code and let me know.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
android:layout_above="#id/bottomNavigationView"
android:layout_alignParentTop="true"
android:layout_marginBottom="8dp"
/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigationView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="#menu/navigation"
android:layout_alignParentBottom="true"
/>
</RelativeLayout>

Bottom Navigation with fab

I am currently working with BottomNavigationView and FloatingActionButton.
What i want to achieve is this below design:
And what i have tried:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
app:layout_insetEdge="bottom"
tools:context=".activity.BottomNavPrimary">
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center|bottom" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottomNavPrimary"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:layout_insetEdge="bottom"
android:background="?android:attr/windowBackground"
app:menu="#menu/bottom_nav_primary"></android.support.design.widget.BottomNavigationView>
</android.support.design.widget.CoordinatorLayout>

Your design looks as if you want to use the new BottomAppBar from the MaterialComponents that will fully be release with Android P. Especially if the left icon stands for a kind of side navigation it could be the right navigation element.
However, you have to be aware, that the elements on the left and right of the FAB have a different purpose than a bottom navigation. Instead of being entry points to "primary destinations" in an app, the BottomAppBar is defined as:
A bottom app bar displays navigation and key actions at the bottom of mobile screens.
So it is for page actions (like opening the dashboard or search). More explanation can be found in the design documentation.
I haven't had a chance to implement it yet (because I really needed it with a bottom navigation), but here is the code documentation example:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Other components and views -->
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:navigationIcon="#drawable/ic_menu_24"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_anchor="#id/bar"/>
</android.support.design.widget.CoordinatorLayout>
So to me, it sounds as if you define your two page menu options and since the FAB is anchored to the bar it will push them to the sides.
The documentation also includes options for the optional FAB cradle that was shown during this year's Google I/O and shows how to handle menu and click handling.
Here is another useful link on how to set up gradle to include the new material components in your project.

I used this, to get something similar.
BottomNavigationView + FloatingActionButton
<androidx.constraintlayout.widget.ConstraintLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floating_button"
style="#style/Widget.MaterialComponents.FloatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_margin="16dp"
app:backgroundTint="#color/colorPrimaryLight"
app:elevation="#dimen/padding_10"
app:layout_constraintBottom_toTopOf="#id/navigation"
app:layout_constraintLeft_toRightOf="#id/navigation"
app:layout_constraintRight_toLeftOf="#id/navigation"
app:layout_constraintTop_toBottomOf="#id/navigation"
app:layout_constraintTop_toTopOf="#id/navigation"
app:layout_insetEdge="bottom"
app:srcCompat="#drawable/ic_add_black_24dp"
app:tint="#color/colorPrimary" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/colorPrimaryDark"
android:visibility="visible"
app:itemIconTint="#drawable/bottom_navigation_icons"
app:itemTextColor="#drawable/bottom_navigation_icons"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>

My solution simple and cool.
Parent layout must be a CoordinatorLayout and use BottomAppBar with FloatingActionButton as you can see below
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<-- your other views -->
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:backgroundTint="#color/colorPrimary">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:id="#+id/homePage"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_percent="0.4">
<androidx.appcompat.widget.AppCompatImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="#drawable/your_drawable"
android:padding="#dimen/small_margin"
app:tint="#color/white" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/profile"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_percent="0.4">
<androidx.appcompat.widget.AppCompatImageView
android:layout_width="wrap_content"
android:padding="#dimen/small_margin"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="#drawable/your_drawable" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.bottomappbar.BottomAppBar>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/categories"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/your_drawable"
app:backgroundTint="#color/colorPrimary"
app:layout_anchor="#id/navigation"
app:tint="#android:color/white" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Result:

You could wrap your BottomNavigationView and your FloatingActionButton in a ConstraintLayout and use the following constraints on the FloatingActionButton:
app:layout_constraintTop_toBottomOf="#id/bottomNavPrimary"
app:layout_constraintBottom_toTopOf="#id/bottomNavPrimary"
app:layout_constraintLeft_toRightOf="#id/bottomNavPrimary"
app:layout_constraintRight_toLeftOf="#id/bottomNavPrimary"
This will center your FloatingActionButton vertically and horizontally relative to your BottomnavigationView
I hope that is what you asked for.
Final code would look something like this:
<android.support.design.widget.CoordinatorLayout android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.constraint.ConstraintLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#id/bottomNavPrimary"
app:layout_constraintBottom_toTopOf="#id/bottomNavPrimary"
app:layout_constraintLeft_toRightOf="#id/bottomNavPrimary"
app:layout_constraintRight_toLeftOf="#id/bottomNavPrimary"/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottomNavPrimary"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:layout_constraintBottom_toTopOf="parent"
android:background="?android:attr/windowBackground"
app:menu="#menu/bottom_nav_primary" />
</android.support.constraint.ConstraintLayout>

I think you can do this with bottomAppBar and embed some button inside that like below
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bottom_app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:backgroundTint="#color/colorPrimary"
app:fabAlignmentMode="center"
app:fabAttached="true"
app:fabCradleDiameter="8dp"
style="#style/Widget.MaterialComponents.BottomAppBar"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ImageButton
android:id="#+id/btnReport"
android:layout_width="0dp"
android:layout_height="match_parent"
android:background="#android:color/transparent"
android:src="#drawable/ic_play"
android:layout_weight="1"
android:paddingRight="20dp"
/>
<ImageButton
android:id="#+id/btnPlayWords"
android:layout_width="0dp"
android:layout_height="match_parent"
android:background="#android:color/transparent"
android:src="#drawable/ic_show_chart"
android:layout_weight="1"
android:paddingLeft="20dp"
/>
</LinearLayout>
</com.google.android.material.bottomappbar.BottomAppBar>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fabAddWord"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_add"
app:layout_anchor="#id/bottom_app_bar" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Text won't appear in TextView

I am making a Navigation Drawer in my Android app. The Navigation Drawer has an Header which includes a Account Icon and a Text View. But when I run the App, I can no longer see the Icon or the TextView.
This is what I have been getting,
Here is my code for my navigation drawer activity_admin.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
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="com.example.vishistvarugeese.ongc_app.AdminActivity">
<android.support.design.widget.NavigationView
app:headerLayout="#layout/admin_nav_header"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#color/white"
app:itemIconTint="#color/black"
app:itemTextColor="#color/colorAccent"
app:menu="#menu/admin_menu"
android:layout_gravity="start"
app:theme="#style/menu_style">
</android.support.design.widget.NavigationView>
This is the code for my navigation header, admin_nav_header.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="160dp"
android:background="#drawable/headernav"
android:paddingTop="20dp"
android:paddingLeft="20dp"
android:paddingRight="20dp">
<ImageView
android:layout_width="70dp"
android:layout_height="70dp"
android:src="#drawable/ic_account_circle_white_48dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/navUserName"
android:text="#string/name"
android:textStyle="bold"
android:textColor="#color/white"
android:layout_marginTop="10dp"/>
</LinearLayout>
This is what I was trying to do
Can someone please help me with the issue?

Remove theme and other property from NavigationView.
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#color/homeDrawerColor"
android:fitsSystemWindows="true"
app:headerLayout="#layout/admin_nav_header"
app:menu="#menu/admin_menu" />
If not work then give a direct string to check any problem in string.xml or not...

Can't place Floating Action Button (FAB) between header and items in DrawerLayout using RecyclerView

I can't get the Floating Action Button (FAB) to appear in the correct position. I want it to appear between the header and the first item in my nav drawer.
Currently, I've got it to appear in the bottom right corner of the header and NOT on top of the line between the 1st and 2nd elements (1st element = header & 2nd element = first item in recyclerview).
My app is using the following appcompat items:
appcompat-v7:23.0.0
recyclerview-v7:23.0.0
design:23.0.0
I'm using a nav drawer but I can't use the NavigationView because I need to customize the item entries and not load a simple menu.
As you know, the drawer is really not 2 different controls. The header is actually the '0' element in the RecyclerView. I don't know if this makes a difference.
Here is my current xml for the header/"0 view in RecyclerView":
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="#dimen/navdrawer_image_height">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/navDrawerHeaderView"
android:layout_width="match_parent"
android:layout_height="#dimen/navdrawer_image_height">
<ImageView
android:id="#+id/navdrawer_image"
android:layout_width="wrap_content"
android:layout_height="#dimen/navdrawer_image_height"
android:contentDescription="#string/cd_navdrawer_image"
android:scaleType="centerCrop"
android:src="#drawable/bg_material_design" />
<de.hdodenhof.circleimageview.CircleImageView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/app_image"
android:layout_width="#dimen/navdrawer_user_picture_size"
android:layout_height="#dimen/navdrawer_user_picture_size"
android:src="#drawable/ic_launcher"
android:layout_marginTop="16dp"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
app:border_width="2dp"
app:border_color="#FF000000"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/appNameTextView"
android:text="App Name"
android:textStyle="bold"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginBottom="16dp"
android:layout_alignParentBottom="true"
android:textColor="#android:color/white"/>
</RelativeLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:clickable="true"
android:src="#drawable/button_account"
app:layout_anchor="#id/navDrawerHeaderView"
app:layout_anchorGravity="bottom|right|end"
app:elevation="4dp"/>
</android.support.design.widget.CoordinatorLayout>
I think I might have the FAB in the wrong location/file. Here is the xml for the drawer.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawerLayout"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:fitsSystemWindows="true">
<!-- Content layout -->
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical">
<include
android:id="#+id/toolbar"
layout="#layout/tool_bar"/>
<FrameLayout
android:id="#+id/contentFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/init_background">
</FrameLayout>
</LinearLayout>
<!-- Pages -->
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="320dp"
android:layout_height="match_parent"
android:layout_gravity="left"
android:background="#ffffff"
android:scrollbars="vertical"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true">
</android.support.v7.widget.RecyclerView>
</android.support.v4.widget.DrawerLayout>
HELP!!!!!

example drawer fragment layout containing your existing RecyclerView:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="200dp">
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f00"
android:id="#+id/header"/>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:scrollbars="vertical"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
<android.support.design.widget.FloatingActionButton
android:layout_height="wrap_content"
android:layout_width="wrap_content"
app:layout_anchor="#id/appbar"
app:layout_anchorGravity="bottom|right|end"
android:layout_margin="5dp"
android:clickable="true"/>
</android.support.design.widget.CoordinatorLayout>