Develop Reference

How to use BottomAppBar with BottomNavigationView inside in a Single Activity App Architecture?

I want to add a FloatingActionButton in the middle of BottomAppBar with curve below.
So i Added tried to design the MainActivity like below. I maintained Single Activity Architecture in this app.
Now, I have faced two problems.
If I want to set Visibility:gone for bottomappbar & floatingActionButtonin any particular fragment than both are gone but created an empty view. Like the screen shot. How can I remove that empty view?
I want to make transparent the gap between FloatingActionButton & BottomAppBar. But failed to do that.
This is the code below of my MainActivity's 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:theme="#style/ThemeOverlay.MaterialComponents.Dark.ActionBar" />
</com.google.android.material.appbar.AppBarLayout>
<fragment
android:id="#+id/my_nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="?attr/actionBarSize"
app:defaultNavHost="true"
app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
app:navGraph="#navigation/navigation_graph" />
<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:fabCradleMargin="10dp"
app:elevation="0dp"
app:fabCradleRoundedCornerRadius="10dp"
app:fabCradleVerticalOffset="10dp">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_nav_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginEnd="16dp"
android:background="#android:color/transparent"
app:menu="#menu/navigation_menu" />
</com.google.android.material.bottomappbar.BottomAppBar>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/app_name"
android:src="#drawable/ic_dashboard_add"
app:backgroundTint="#color/colorDashboardFloatingButton"
app:tint="#color/colorWhite"
app:layout_anchor="#id/bottomAppBar" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Here are the screenshots.

OneUi styled navigation in android java

I'm beginner in android programming and I want to know how to make an OneUi styled navigation like in this picture.
This is what I made so far. Unfortunately, when I scroll it, it will totally collapse and I cannot get it back.
I used CoordinatorLayout with AppBarLayout and I follow some code from material.io guidelines but it did'nt work as I expected. I want the app bar to be short when scrolled and tall when it is on the top.
Here is my XML Layout 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"
android:background="#F0F0F0"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="256dp">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:expandedTitleMarginStart="72dp"
app:expandedTitleMarginBottom="28dp"
app:layout_scrollFlags="scroll|snap">
<com.google.android.material.appbar.MaterialToolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_collapseMode="pin"
app:contentInsetStart="0dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="This is a text"
android:textSize="50dp"
/>
</RelativeLayout>
</com.google.android.material.appbar.MaterialToolbar>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false">
</androidx.cardview.widget.CardView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

For your use case. There are few things you need to change.
Put the content below AppBarLayout in NestedScrollView to have scrolling layout_behavior.
Put some content to mimic scrolling effect. Like textview with huge height for example.
Put the content you want to collapse into one CollapsingToolbarLayout basically things to show when it's tall or not collapsed.
Put your MaterialToolbar as a direct child of AppBarLayout
Example code:
<?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:background="#F0F0F0"
tools:context=".MainActivity">
<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:expandedTitleMarginBottom="28dp"
app:expandedTitleMarginStart="72dp"
app:layout_scrollFlags="scroll|snap">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="This is collapsing content"
android:textSize="32sp" />
</RelativeLayout>
</com.google.android.material.appbar.CollapsingToolbarLayout>
<com.google.android.material.appbar.MaterialToolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentInsetStart="0dp"
app:layout_collapseMode="pin"
app:title="This is MaterialToolbar" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false">
<TextView
android:layout_width="match_parent"
android:layout_height="800dp"
android:text="Hello Test" />
</androidx.cardview.widget.CardView>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Output:
Not collapsed:
Collapsed:

How to center button in toolbar Android

I am new to android app development. I am trying to create a toolbar that has 3 buttons on it, left middle and center. My left are right buttons are positioned correctly but my middle button displays in the middle of the page instead of middle of the tool bar. Wondering if anyone can help with this. Thanks
Also wondering if anyone can help with the white space above the tool bar
activity_main:
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
>
<include
android:id="#+id/app_bar_main"
layout="#layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<include
android:id="#+id/toolbar"
layout="#layout/toolbarlayout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="#+id/menu_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="Menu" />
<Button
android:id="#+id/add_new_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_centerInParent="true"
android:text="Add New" />
<Button
android:id="#+id/home_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="Home" />
</RelativeLayout>
<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:background="#141619"
android:fitsSystemWindows="true"
app:itemIconTint="#141619"
app:itemTextColor="#FFFFFF"
app:menu="#menu/activity_main_drawer" >
</com.google.android.material.navigation.NavigationView>
</androidx.drawerlayout.widget.DrawerLayout>
app_bar_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:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/Theme.MPL.AppBarOverlay">
</com.google.android.material.appbar.AppBarLayout>
<include layout="#layout/content_main" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
toolbarlayout:
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#141619"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
/>

I have fixed issue with all of your layouts.
for your activity_main.xml copy and paste below layout.
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="#+id/app_bar_main"
layout="#layout/app_bar_main" />
</RelativeLayout>
<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:background="#141619"
android:fitsSystemWindows="true"
app:itemIconTint="#141619"
app:itemTextColor="#FFFFFF">
</com.google.android.material.navigation.NavigationView>
</androidx.drawerlayout.widget.DrawerLayout>
change you app_bar_main to following
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#282941"
android:fitsSystemWindows="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:minHeight="?attr/actionBarSize">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:paddingEnd="16dp">
<Button
android:id="#+id/menu_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="Menu" />
<Button
android:id="#+id/add_new_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_centerInParent="true"
android:text="Add New" />
<Button
android:id="#+id/home_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="Home" />
</RelativeLayout>
</androidx.appcompat.widget.Toolbar>
That's it, you don't have to create any other layout. Now wherever you want to have this toolbar you can include your app_bar_main.xml in the layout and you will get the toolbar. Then in your activity if you want to access toolbar and button inside toolbar, do like this:
Toolbar toolbar = findViewById(R.id.account_toolbar);
setSupportActionBar(toolbar);
Button btnEdit = toolbar.findViewById(R.id.menu_button);
let me know if you have any questions. I'll try to help you out.

I don't know if what you are trying to do is a good idea.
From a design perspective, you have only a limited space in the toolbar and you should position there only the most relevant actions to the context, all the other actions are going to be hiden in the classic "three dots" menu.
You can check what I mean here https://developer.android.com/training/appbar/actions
https://material.io/components/app-bars-top#anatomy
Even thouth, to achieve what you are trying to do, I'll do it using Constraint Layout instead of Relative Layout, makes your life easier and is up to date ;) https://developer.android.com/training/constraint-layout

First, create title_menu.xml Layout. make sure android:layout_height="wrap_content" and android:gravity="center"
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Button"/>
</LinearLayout>
Second, add the following code on the onCreate method in your Activity.
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setCustomView(R.layout.title_menu);

Collapsing toolbar with navigation ui android

I' am trying everything but I don't know how to do a collapsing toolbar with a jetpack navigation fragment. I want this in my screen :
Toolbar (with collapse mode)
Fragment loading by Navigation Jetpack
AdView (from admob)
BottomNavigationView
I tried change order of relative layout and coordinator, but nothing works, in my app.
I have a recycler view on fragments, and when I'm using the scroll, toolbar doesn't hide.
My code is:
<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"
tools:context=".activies.MainActivity">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/adView"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:titleEnabled="false"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleGravity="top"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<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/ThemeOverlay.AppCompat.DayNight"
app:titleTextColor="#android:color/white"
app:layout_scrollFlags="scroll|enterAlways" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<fragment
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="#navigation/nav_graph" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<FrameLayout
android:id="#+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignWithParentIfMissing="true"
android:layout_above="#+id/bottomNavigation"
android:layout_gravity="center"
android:gravity="center"
android:visibility="gone" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:theme="#style/BottomNavigationTheme"
app:menu="#menu/menu_navigation_bottom">
</com.google.android.material.bottomnavigation.BottomNavigationView>
</RelativeLayout>
Someone can help me? Thank you so much.

Negative margin Layout to overlay parent layout

I have an activity that has a toolbar and a framelayout where I inject fragments.
This is the layout for that activity:
<android.support.v4.widget.DrawerLayout
android:id="#+id/drwDrawerRoot"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background_main_selector"
android:theme="#style/AppTheme">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="#+id/viewMainToolbar"
layout="#layout/view_toolbar" />
</LinearLayout>
<FrameLayout
android:id="#+id/frmDrawerContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="#dimen/toolbar_height"
android:clipChildren="false"
android:clipToPadding="false"
android:orientation="vertical" />
<include
android:id="#+id/viewDrawer"
layout="#layout/view_drawer"
bind:name="#{name}"/>
<include
android:id="#+id/viewUserDrawer"
layout="#layout/view_user_drawer"
bind:name="#{name}"/>
</android.support.v4.widget.DrawerLayout>
I have the framelayout with a margin so that the contents from the fragments do not overlay the toolbar, but I set clipChildren and clipToPadding to false as per some other posts I have seen here.
On some fragments however I have a loading view, which I would like to occupy all the screen.
This is a sample fragment:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/layout_main"
style="#style/Layout.FullScreen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/layout_footer"
android:orientation="vertical">
<TextView
android:id="#+id/textView7"
style="#style/Text.Header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/login_header" />
<EditText
android:id="#+id/edtMessage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:elevation="1dp"
android:ems="10"
android:inputType="textMultiLine" />
<Button
android:id="#+id/btnSend"
style="#style/Button.Primary"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/support_button" />
</LinearLayout>
<LinearLayout
android:id="#+id/layout_footer"
style="#style/Layout.FullScreen.Footer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="vertical">
<TextView
android:id="#+id/footerInfo"
style="#style/Text.White.Small.Centered"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/footer_info" />
</LinearLayout>
<include
layout="#layout/view_loading"
android:visibility="invisible"
bind:loading="#{loading}" />
</RelativeLayout>
Ans this is the included loading view, which I have set with negative margin, hoping it would move up to the top of the screen:
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="-40dp"
android:background="#color/colorLoadingBackground"
android:clickable="true"
android:visibility="#{loading ? View.VISIBLE : View.GONE}">
</FrameLayout>
Am I missing something here?
Is this doable or do I need to change how I am doing this?
Clarification:
The first / root layout includes a toolbar and the second layout is included within the frame layout of the first. this means that the content of the second layout starts below the toolbar. However, I would like the third layout (a loading screen that is included in the second layout) to have a negative margin so that it overlays the full screen, not just starting below the toolbar.

You need to use CoordinatorLayout then you wont need negative margins. here are the sample layout u can customise according to your need
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
android:id="#+id/drawer_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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
app:layout_behavior= "#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:title="My App" />
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
<!--include a full screen loading layout here and hide/show according to your need-->
<include layout="#layout/loading_layout/>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="#layout/nav_header"/>
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>