Develop Reference

Floating Action button is not showing in Android Coordinator Layout

I am new to Android and UI development. I have downloaded latest version of Windows Android studio and did some basic native UI, it worked well. Now, I am trying to develop floating action button UI.
I have added CoordinatorLayout inside ConstraintLayout. FAB is added inside CoordinatorLayout. My FAB is not visible in layout preview.
I see androidx.coordinatorlayout.widget.CoordinatorLayout text in that layout with background color. Please let me know how to fix this
implementation 'com.google.android.material:material:1.2.0'
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#F44336"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
tools:ignore="MissingConstraints">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorPrimary"
android:src="#drawable/ic_baseline_add_24"
android:layout_gravity="bottom|end"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

add constraintTop for your CoordinatorLayout for filling whole screen
app:layout_constraintTop_toTopOf="parent"
or even this will be better
android:layout_width="match_parent"
android:layout_height="match_parent"
with removing all constraints
for test you may also add fixed size FloatingActionButton. if you want to keep wrap_content for FAB then ensure that ic_baseline_add_24 is valid icon with proper size
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F44336"
tools:ignore="MissingConstraints">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="80dp"
android:layout_height="80dp"
android:backgroundTint="#color/colorPrimary"
android:src="#drawable/ic_baseline_add_24"
android:layout_gravity="bottom|end"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
in above code ConstraintLayout isn't needed and you may remove it if you aren't planning to make some more complicated layout. RecyclerView may be placed inside CoordinatorLayout just before FAB - at first REcyclerView will be drawn, after that FAB on top of recycler

Try
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#F44336"
android:layout_gravity="bottom"
tools:ignore="MissingConstraints">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="104dp"
android:layout_height="107dp"
android:layout_gravity="center"
android:foregroundGravity="center"
android:visibility="visible"
android:src="#drawable/ic_baseline_add_24"
app:backgroundTint="#color/colorPrimary" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</LinearLayout>

Don't use a CoordinatorLayout with android:layout_height="wrap_content" to contain just the FAB:
<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:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvItems"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#drawable/ic_add_24px" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Android recyclerview not scrolling on lower end devices with sticky header - why?

i have this issue where my recyclerview does not do nestedscrolling on api 19 (lollipop) ...on latest version of android its ok.
using following dependency: com.android.support:design:26.1.0
and what i have created is a recyclerview that should have a sticky header. the header is in a cardview and the list items are below the cardview. it looks like this:
detailscreen.xml:
<!--wrapping in RelativeLayout until this is resolved: https://stackoverflow.com/questions/57142959/why-latest-version-constraintlayout-doesnt-work-in-nestedscrollview-with-coordi-->
<RelativeLayout 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"
android:orientation="vertical">
<androidx.cardview.widget.CardView
android:id="#+id/headerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="4dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp">
<TextView
android:id="#+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="#string/ride_hail_meet_at"
android:textColor="#388bf2"
app:layout_constraintBottom_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_weatherdata"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:focusable="false"
android:focusableInTouchMode="false"
android:nestedScrollingEnabled="false"
android:orientation="horizontal"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintLeft_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/tv_description"
tools:itemCount="3"
tools:listitem="#layout/weather_data_row_item"
tools:visibility="visible" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
<RelativeLayout
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/headerView"
android:layout_alignParentBottom="true"
android:background="#color/white">
<!-- THIS IS THE RECYCLERVIEW GIVING ME THE PROBLEMS. ITS NOT SCROLLING ON API 19 , WHY ??? -->
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_directions"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="16dp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:itemCount="5"
tools:listitem="#layout/ride_direction_row" />
</RelativeLayout>
when i inflate this thing its placed inside a CoordinatorLayout customView. that container itself can be scrolled. What am i doing wrong that it works on recent versions of android but not lollipop ? i even tried using a appBarLayout and putting my headerView in that but same thing just on older version of android, not working. im open to changing the xml entirely if you can suggest a better approach ?
note: setting android:nestedScrollingEnabled = false is going to cause my recyclerView not to recyclerviews. i have big images in the list so i need this feature.

You'd have to set android:layout_height to match_parent or a fixed size.
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent" />
If you set it to wrap_content it'll expand to the size of its content and thus not scroll.

so odd this is the only way i could get it resolved:
<?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">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleGravity="bottom"
app:expandedTitleMarginEnd="#dimen/activity_horizontal_margin"
app:expandedTitleMarginStart="#dimen/activity_horizontal_margin"
app:layout_scrollFlags="noScroll"
app:title="#string/app_name">
<ImageView
android:id="#+id/toolbar_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:contentDescription="#null"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="#drawable/beach_huts" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
so strange this works for everything ..thanks everyone. they key thing is i need to put the recyclerView FIRST above everything else. then define the appbar stuff afterwards.

Button goes under a layout which is defined below it

Hi I have a fab button in my layout "addfab" which is showing correctly in most phones but in android 4.4 kitkat hides under a Relative layout that is defined under it in xml.They both are defined to be below one object Here is my xml.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:fbutton="http://schemas.android.com/tools"
android:weightSum="1">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/bar1"
>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:textAlignment="center"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/addfab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#id/bar1"
android:layout_marginRight="20dp"
android:layout_marginTop="130dp"
android:clickable="true"
android:elevation="2dp"
android:src="#drawable/logo_green"
app:fabSize="normal"
/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/pic"
android:layout_below="#id/bar1"
android:background="#color/colorPrimary">
<com.mikhaellopez.circularimageview.CircularImageView
android:layout_width="150dp"
android:layout_height="150dp"
android:id="#+id/image_gol"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
app:civ_border_color="#color/colorPrimary"
app:civ_border_width="5dp"
app:civ_shadow="false"
app:civ_shadow_radius="5"
app:civ_shadow_color="#9e9e9e"/>
</RelativeLayout>
What should I do? Why androids act differently?

Instead of RelativeLayout, use CoordinatorLayout:
<android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.AppBarLayout>
//Toolbar here
</android.support.design.widget.AppBarLayout>
// your fab and relativelayout here
</android.support.design.widget.CoordinatorLayout>
As the root level tag. You'll be able to anchor it(The FloatingActionButton) to the views you want by using:
app:layout_anchor="#id/viewpager"
app:layout_anchorGravity="bottom|right|end"
Attributes. This also allows you to have more functionality like hiding Toolbar or etc in future. You'll also need to change-remove old RelativeLayout's attributes later in order to use CoordinatorLayout.
Take a look: https://guides.codepath.com/android/floating-action-buttons

Android floating action button hidden behind of bottom navigation bar

New to android programming & struggling with right now. I'm using android studio's default "Navigation Drawer Activity". On top of that, I've added a Bottom Bar from https://github.com/roughike/BottomBar. But, after adding that my FAB has hidden behind the Bottom Bar.
Here is the Scrrenshot -
I know it's some kind of style issue. I tried to give bottomMargin for FAB. But, it's not working.
Here is my code -
app_bar_main.xml
<?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"
android:fitsSystemWindows="true"
tools:context="com.bhramaan.android.bhramaan.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/BhramaanTheme.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/BhramaanTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
<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"
android:src="#android:drawable/ic_dialog_email" />
<com.roughike.bottombar.BottomBar
android:id="#+id/bottomBar"
android:layout_width="match_parent"
android:layout_gravity="bottom|end"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
app:bb_behavior="shy"
android:background="#color/bottomBar"
app:bb_activeTabColor="#color/white"
app:bb_tabXmlResource="#xml/bottombar_tabs" />
</android.support.design.widget.CoordinatorLayout>
Need Some Guidance to solve this.

Add app:elevation="#dimen/text_margin" like this:
<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"
android:src="#android:drawable/ic_dialog_email"
app:elevation="#dimen/text_margin" /><!--adding this line should resolve your problem-->

Here is a solution that works for our use case. Basically we wanted to hide bottom navigation view and the fab that belongs to it whenever the user scrolls in the screen.
For that purpose we have decided to use the app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior" that comes out of the box for BottomNavigationView. All that is left is to anchor the fab to the BottomNavigationView and use the same layout_behavior on fab, too.
Here is an example of it:
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<include layout="#layout/inc_app_bar"/>
<fragment
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/main_nav_host_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
android:name="androidx.navigation.fragment.NavHostFragment"
app:navGraph="#navigation/bottom_nav_graph"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/main_bottom_nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
style="#style/Theme.BottomNavigationView"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
app:labelVisibilityMode="labeled"
android:background="?android:attr/windowBackground"
app:menu="#menu/bottom_nav_menu"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/main_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_anchor="#id/main_bottom_nav_view"
app:layout_anchorGravity="top|end"
android:layout_marginBottom="#dimen/fab_margin_bottom"
android:layout_marginEnd="#dimen/fab_margin_end"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
app:srcCompat="#drawable/ic_add_24px"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Other than that you can define your own layout_behavior for fab as explained in GitHub: BlogPosts / android-coordinatorlayout-scrolling-hide-fab-behavior.md too.
I hope that it helps :)

In advance I let other know this solution fits to my needs. I don't need fancy animations(which is ok, but not for my project requirements). What I did is to wrap the main content(FrameLayout), the FAB and the BottomNavigationView inside a RelativeLayout. Again, I think this could be done in a better way, so i'm open to suggestions.
<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">
<android.support.design.widget.AppBarLayout
android:id="#+id/admin_appbar_layout"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:layout_width="fill_parent"
android:layout_height="?attr/actionBarSize"
android:layout_alignParentTop="true"
tools:elevation="4dp">
<!-- The toolbar -->
<android.support.v7.widget.Toolbar
android:id="#+id/admin_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/customActionBar"
app:theme="#style/customActionBar"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center_horizontal">
<TextView
android:id="#+id/tv_toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/H2_bold"
android:text="#string/activity_admin_name"/>
</LinearLayout>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="?attr/actionBarSize">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottom_navigation_bar"/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab_add_new_item"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="#drawable/ic_action_new"
android:layout_alignParentEnd="true"
android:layout_above="#+id/bottom_navigation_bar"
android:layout_margin="#dimen/fab_dimen"
tools:elevation="2dp"/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_navigation_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:itemBackground="#color/black"
app:itemIconTint="#color/white"
app:itemTextColor="#color/white"
app:menu="#menu/admin_bottom_navigation_items"
tools:elevation="2dp"/>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
I know the question may seems old, but hope this helps to someone else.

Its just margin issue. Just try to implement this code in your coordinatorLayout
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_marginBottom="?attr/actionBarSize">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
style="#style/floating_action_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/ic_add_plus" />
</FrameLayout>
And use this style in your style.xml file.
<style name="floating_action_button">
<item name="android:layout_marginBottom">16dp</item>
</style>
We're just doubling the margin. First BottomNavigationView, and Second the default margin of FAB.

Change your xml as this. Add some more properties to your Floating Action Button.
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_gravity="bottom|end"
android:layout_marginBottom="70dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:src="#android:drawable/ic_dialog_email" />

Bottom navigation bar hides on trying scroll

I have Activity with bottom navigation bar (via roughike BottomBar library). It's look like this:
When i'm trying to scroll page, bottom bar hides automatically. So, I get this:
I want avoid this effect. I do not want hide bottom bar when I'm just trying to scroll content but all content lies on screen.
But if page contains content more than one screen then bottom bar must hides on scroll (and now it's works fine).
My code doesn't have any listeners for scroll and my xml file looks like this:
<android.support.design.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"
tools:context=".presentation.ui.mainactivity.MainActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/mainCord" >
<android.support.design.widget.AppBarLayout
android:id="#+id/sliderContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_height="?attr/actionBarSize"
android:layout_width="match_parent"
android:background="#color/primary"
android:theme="#style/ToolbarStyle"
app:titleTextAppearance="#style/ToolbarStyle" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:visibility="gone" />
<com.roughike.bottombar.BottomBar
android:id="#+id/bottomBar"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_gravity="bottom"
app:bb_tabXmlResource="#xml/bottom_bar_tabs"
app:bb_activeTabColor="#color/white"
app:bb_inActiveTabColor="#color/bottom_bar_inactive_tab"
app:bb_inActiveTabAlpha="1"
app:bb_behavior="shy|shifting" />
</android.support.design.widget.CoordinatorLayout>
I'm looked for solution for my problem but found nothing. What can i do for avoid this effect?
UPDATED:
FAB is inside ViewPager. Layout for tab on screenshot look like this:
<?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:id="#+id/eventCoordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/refresh"
android:visibility="visible"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v7.widget.RecyclerView
android:id="#+id/eventsRecyclerView"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity = "center"
android:gravity="center" >
<TextView
android:id="#+id/emptyText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/secondary_text"
android:textSize="16sp"
android:gravity="center"
android:text="#string/empty_events_text"
android:drawableTop="#drawable/ic_no_calendar"
android:drawablePadding="4dp"
android:visibility="gone" />
<TextView
android:id="#+id/createEventText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/create_event_text"
android:textColor="#color/secondary_text"
android:textSize="16sp"
android:visibility="gone" />
<TextView
android:id="#+id/createEventButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/primary"
android:text="#string/create_event"
android:textSize="16sp"
android:visibility="gone" />
</LinearLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/createEvent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:src="#drawable/ic_add_white_24dp"
style="#style/floating_action_button"
app:layout_anchor="#id/eventsRecyclerView"
app:layout_anchorGravity="bottom|end"
app:borderWidth="0dp"
app:elevation="6dp"
app:pressedTranslationZ="12dp" />
<RelativeLayout
android:id="#+id/loadingPanel"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:indeterminate="true" />
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

app:bb_behavior="underNavbar"
You have an issue in the following code
<com.roughike.bottombar.BottomBar
android:id="#+id/bottomBar"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_gravity="bottom"
app:bb_tabXmlResource="#xml/bottom_bar_tabs"
app:bb_activeTabColor="#color/white"
app:bb_inActiveTabColor="#color/bottom_bar_inactive_tab"
app:bb_inActiveTabAlpha="1"
app:bb_behavior="shy|shifting" />
replace the
app:bb_behavior="shy|shifting"
with
app:bb_behavior="underNavbar"
Hope this works for you!

Check your manifest FILE and make sure you're not using full screen theme...However, you can use the following code to hide and show the bar on android higher than API 19. To hide the bar, just change VISIBLE to GONE, and make sure you call the showNavBar() method in both your onCreate() and onResume() method
public void showNavBar() {
View view = getWindow().getDecorView();
view.setSystemUiVisibility(View.VISIBLE);
}

I had the same issue, I fixed it by doing this:
In activity_main.xml add this to the CoordinatorLayout:
android:fitsSystemWindows="true"
The viewpager should be like this:
<android.support.v4.view.ViewPager
android:background="#color/colorPrimary"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
And in all your Fragments, they should start with NestedScrollView and must contain (fillViewport):
<android.support.v4.widget.NestedScrollView 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/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
tools:context="com.khan.junaid.phonefans.MainActivity">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fans_list_view"
/>
</android.support.v4.widget.NestedScrollView>
These settings will make the fragments scrollable, and the content will no more be hiding behind the Navigation bar buttons.