Develop Reference

the appbar is coming above the recyclerview

I create a navigation drawer activity, then I create a blank fragment and inside it I dropped a recyclerView, in app_bar_main.xml file the recyclerview is coming under the appbar
Here is the app_bar_main.xml code:
<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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/Theme.Test1.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/Theme.Test1.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<include layout="#layout/content_main" />
<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"
android:layout_marginEnd="#dimen/fab_margin"
android:layout_marginBottom="16dp"
app:srcCompat="#android:drawable/ic_dialog_email" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
here it how it looks like
its my first time using stack overflow sry for the bad format

Try This
<?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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:background="#color/colorAccent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
in your content_main.xml file put this app:layout_behavior="#string/appbar_scrolling_view_behavior in your root layout

How do I hide Material Bottom App Bar when Coordinator Layout's child fragment is scrolled?

I wonder why app:hideOnScroll="true" is not working in my case, when I want my BottomAppBar to be hidden when scrolling.
I want to achieve something like this: Hide bottom app bar on scroll
activity_main.xml
<?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:id="#+id/main_coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
app:elevation="0dp">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/colorBackgroundPrimary"
android:theme="#style/customtoolbar"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:titleTextColor="#color/colorTextPrimary" />
</com.google.android.material.appbar.AppBarLayout>
<include layout="#layout/content_main" />
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bar"
style="#style/Widget.MaterialComponents.BottomAppBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:backgroundTint="#color/colorBtn"
app:hideOnScroll="true"
app:layout_scrollFlags="scroll|enterAlways"
app:navigationIcon="#drawable/baseline_menu_24"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorPrimaryDark"
android:src="#drawable/baseline_add_24"
app:layout_anchor="#id/bar" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="#color/colorBackgroundPrimary"
android:backgroundTint="#color/colorBackgroundPrimary"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="#layout/activity_main">
<FrameLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</FrameLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

root element of content_main.xml should be NestedScrollView or RecyclerView if you want to enable hideOnScroll

SwipeRefreshLayout overlaps BottomAppbar

I feel like I've tried everything to resolve this but I can't figure out how to have a Coordinatorlayout containing an bottom app bar and a constraintlayout that contains a swipe refreshlayout without the refresh layout overlapping the bottom app bar.
<?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"
android:animateLayoutChanges="true"
android:background="#color/colorWhite"
tools:context=".departures.DeparturesActivity">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true"
android:background="#color/colorWhite"
tools:context=".departures.DeparturesActivity">
<RelativeLayout-with-some-stuff-in-it/>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/departures_swiperefresh_layout"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="0dp">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/departures_list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:paddingLeft="#dimen/md_keylines"
android:paddingTop="#dimen/md_keylines"
android:paddingRight="#dimen/md_keylines"
android:paddingBottom="#dimen/md_keylines" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/departures_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:backgroundTint="#color/colorAccent"
app:layout_anchor="#id/bottomAppBar"
app:srcCompat="#drawable/ic_add"
app:tint="#color/colorWhite" />
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bottomAppBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:backgroundTint="#color/colorPrimary"
app:fabAlignmentMode="end"
app:fabCradleMargin="4dp"
app:fabCradleRoundedCornerRadius="16dp"
app:fabCradleVerticalOffset="4dp"
app:popupTheme="#style/ThemeOverlay.MaterialComponents.Light"
app:theme="#style/ThemeOverlay.MaterialComponents.Dark.ActionBar" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
The SwipeRefreshLayout will overlap the bottom app bar and I cant quite figure out why.
Part of the problem is the fact that the UI designer seems to indicate that the constraintlayout expands way below the coordinatorLayout.
This is due of the padding added here to push the layout below the actionbar.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".departures.DeparturesPresenter">
<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"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="#+id/contentFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="?android:attr/actionBarSize" />
</androidx.constraintlayout.widget.ConstraintLayout>

Positioning views in Coordinator Layout

I am trying to create a screen with coordinator layout that includes:
Toolbar
Fragment, which will be replaced for every page using navigation API
Bottom App bar
However, I am struggling with positioning views in a way so the app's bottom bar doesn't overlap what in the fragment.
Any chance you could help me out with this, please? From what I can tell, the only way is to add a margin at the bottom but this may not be consistent across devices.
To illustrate, this list has a total of 25 items but the last two are overlapped by the app's bottom bar.
activity main
<?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">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:theme="#style/AppTheme.AppBarOverlay"
android:animateLayoutChanges="true"
android:layout_above="#id/include">
<androidx.appcompat.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"/>
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.tabs.TabItem
android:text="Test 1"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
<com.google.android.material.tabs.TabItem
android:text="Test 2"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
</com.google.android.material.tabs.TabLayout>
</com.google.android.material.appbar.AppBarLayout>
<include
layout="#layout/content_main"
android:id="#+id/include"/>
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bar"
android:layout_gravity="bottom"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_anchorGravity="right|top"
app:layout_anchor="#+id/bar"
android:src="#drawable/ic_add_black_24dp"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
content main xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
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_main"
tools:context=".MainActivity">
<fragment
android:layout_width="411dp"
android:layout_height="627dp"
android:name="com.example.fitnessfatality.startScreen.StartFragment"
android:id="#+id/fragment"
/>
</FrameLayout>

Use these 3 properties to position each other
android:layout_gravity=""
app:layout_anchorGravity=""
app:layout_anchor="#id/xxxx"
Also here is an complete xml that can help you
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".home.HomeFragment">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
android:fitsSystemWindows="true"
android:id="#+id/app_barlayout"
android:theme="#style/AppTheme.AppBarOverlay">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collaps_toolabar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
app:expandedTitleTextAppearance="#style/CollapsingToolbarLayoutExpandedTextStyle">
<LinearLayout
android:id="#+id/layout_currentMatch_item"
android:layout_width="match_parent"
android:layout_height="160dp"
android:orientation="vertical">
</LinearLayout>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:layout_anchorGravity="bottom"
app:layout_anchor="#id/app_barlayout"
android:orientation="horizontal" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

You can use LinearLayout inside CoordinatorLayout to arrange your views if it fits your needs or ConstraintLayout
I hope that the basis of the decision is clear. Take a look at this example:
<?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=".MainActivity">
<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>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
layout="#layout/content_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<LinearLayout
android:id="#+id/bar"
android:orientation="vertical"
android:layout_weight="0"
android:background="#color/colorAccent"
android:layout_width="match_parent"
android:layout_height="100dp"/>
</LinearLayout>
<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>

How to hide toolbar when scrolling on Fragment

I have a main activity:
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
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"
android:background="?attr/colorPrimary"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<include layout="#layout/toolbar" />
</com.google.android.material.appbar.AppBarLayout>
<FrameLayout
android:id="#+id/frameInicio"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/adView"
android:layout_alignParentStart="true"
android:layout_marginTop="?android:attr/actionBarSize"
android:orientation="horizontal" />
<com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/navigation"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:gravity="center"
android:visibility="visible"
ads:adSize="SMART_BANNER"
ads:adUnitId="example" />
<com.ittianyu.bottomnavigationviewex.BottomNavigationViewEx
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="#menu/bottom_navigation" />
</RelativeLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
In FrameLayout "frameInicio" I load a fragment with this:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/swipeApuestas"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerApuestas"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</RelativeLayout>
I want when scroll in RecyclerView in Fragment, Toolbar of main_activity_layout, hides. How can I do?
I tried with recycler in the same activity, but i don't wanna do this, I want with diferent fragment, because I have a bottom navigation to control diferent fragment.
Thank you so much.

I have just faced your problem but the only difference is I'm scrolling within listview. Anyway I think that solution can be applied on your recyclerview too.
first this is how your fragment.xml should look like
<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:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<androidx.appcompat.widget.Toolbar
android:id="#+id/tool_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="enterAlways|scroll|snap">
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/swipeApuestas"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerApuestas"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout> </androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
don't forget to initialize the toolbar within the fragment

Try this:
<?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:gravity="center"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".DashboardActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar_main"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay"
/>
<FrameLayout android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_gravity="bottom"
android:id="#+id/navigation"
app:labelVisibilityMode="labeled"
android:background="?android:attr/windowBackground"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="#menu/menu_nav"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
For your Main Activity (not fragment)