Develop Reference

Android- bottom Navigation bar is long

bottom Navigation bar is long seems like a space is excreted, i tried to solve this problem a days.
This is the problem
:
This is the xml 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:fitsSystemWindows="true"
tools:context=".Home_activity">
<!-- 813dp -->
<fragment
android:id="#+id/fragment"
android:name="com.anonymous.nr_chemistryteam.BlankFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bottomAppBar"
style="#style/Widget.MaterialComponents.BottomAppBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:backgroundTint="#color/white"
android:theme="#style/AppThemeMaterial2"
app:fabCradleMargin="8dp"
app:fabCradleRoundedCornerRadius="50dp"
app:fabCradleVerticalOffset="6dp">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/homeNvBottom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:background="#drawable/empty_background"
app:menu="#menu/bottom_menu" />
</com.google.android.material.bottomappbar.BottomAppBar>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#ff5e00"
android:src="#drawable/ic_cart"
app:fabCustomSize="72dp"
app:layout_anchor="#id/bottomAppBar"
app:maxImageSize="34dp" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
This is the menu xml code :
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/home_page2"
android:icon="#drawable/ic_home2"
android:title="Home" />
<item
android:id="#+id/message_page2"
android:icon="#drawable/ic_message1"
android:title="Message" />
<item
android:id="#+id/placeholder"
android:checkable="false"
android:title="" />
<item
android:id="#+id/help_page2"
android:icon="#drawable/ic_help"
android:title="Help" />
<item
android:id="#+id/settings_page2"
android:icon="#drawable/ic_settings"
android:title="Settings" />
I am using coordinator layout so i think coordinator layout is the problem or might be the fragment i used.
what should i do to remove this space (space below bottom Navigation bar that already in picture)?

You could try making the height of the Bottom Bar 100dp.

BottomNavigationView dont show menu

I'm trying to add a BottomMenu to my app but it doesn't appear. I have tried changing the background color, adding the wight property but nothing works.
My activity
<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=".MainActivity">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottomNavigationView"
android:layout_width="match_parent"
android:layout_height="#dimen/_40sdp"
android:background="#fff"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="#menu/bottom_menu" />
</androidx.constraintlayout.widget.ConstraintLayout>
bottommenu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/dateAndTimeFragment"
android:title="Home"
android:icon="#drawable/ic_baseline_home_24"
/>
<item
android:id="#+id/settingsFragment"
android:title="SMS"
android:icon="#drawable/ic_baseline_settings_24"
/>
<item
android:id="#+id/messagesFragment"
android:title="CONFIGURATION"
android:icon="#drawable/ic_baseline_settings_24"
/>
</menu>
Here you can see how it does not show anything

MaterialBottomNavigation has no animations

My Bottomnavigationbar has no animations when i tap items. I tried changing themes, colors etc. they still don't show up. I want the items to get bigger and show the titles. Normal bottomnavigationbar also has the same issue. Do i need to do this programmatically or is it supposed to animate the items when they are pressed?
BottomNavigation:
<?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:id="#+id/linearLayout4"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Main">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.fragment.app.FragmentContainerView
android:id="#+id/mainFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#+id/btnm"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/btnm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="#+id/mainFragment"
app:menu="#menu/nav_menu" />
</androidx.constraintlayout.widget.ConstraintLayout>
Items:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/settings"
android:title="Settings"
android:icon="#drawable/ic_settings_black_24dp" />
<item
android:id="#+id/pls"
android:icon="#drawable/ic_storage_black_24dp"
android:title="Plugins" />
<item
android:id="#+id/software"
android:icon="#drawable/ic_baseline_home_24"
android:title="Manage" />
<item
android:id="#+id/deletepls"
android:icon="#drawable/ic_delete_sweep_black_24dp"
android:title="Delete plugins" />
<item
android:id="#+id/consolepage"
android:icon="#drawable/ic_desktop_mac_black_24dp"
android:title="Console"/>
</menu>

How to increase distance between items in BottomBar?

I want to make exactly the same, bottom bar with floating action button. I have used standart BottomNavigationView as well as this library, but I can't increase the distance between items. Is there a way to do that?

Add a fifth item to your bottom navigation. Give it an empty string for its label and a completely transparent image for its icon. Also make it disabled. Put this item in the middle position.
The visual effect will be that there's no item in the center of the screen, and the rest of the buttons should be spaced nicely around the floating action button.

this is work for me.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:background="#color/colorAccent" />
</RelativeLayout>
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:backgroundTint="#color/white"
android:scaleType="center"
app:fabSize="normal"
app:layout_anchor="#+id/bottom_navigation"
app:layout_anchorGravity="top|center_horizontal" />
</android.support.design.widget.CoordinatorLayout>

This worked for me Just add fifth item with:
<item android:title=""/>
This will add extra spaces between items.
Happy coding.

Add 5th item and then disable it programatically
<?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/container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="#+id/nav_host_fragment_activity_main"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="#navigation/fitness_navigation" />
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/bottomAppBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:backgroundTint="#color/colorSecondary"
app:fabCradleMargin="6dp"
app:fabCradleRoundedCornerRadius="20dp"
app:fabCradleVerticalOffset="1dp">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
app:labelVisibilityMode="labeled"
android:layout_marginEnd="16dp"
app:itemIconTint="#drawable/tab_color"
app:itemTextColor="#drawable/tab_color"
app:menu="#menu/bottom_nav_menu" />
</com.google.android.material.bottomappbar.BottomAppBar>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab_start_exercise"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/title_start"
app:tint="?colorOnPrimary"
android:theme="#style/FabButtonTheme"
app:maxImageSize="45dp"
android:src="#drawable/ic_run"
app:layout_anchor="#id/bottomAppBar" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/navigation_home"
android:icon="#drawable/ic_home"
android:title="#string/title_home" />
<item
android:id="#+id/navigation_plan"
android:icon="#drawable/ic_plan"
android:title="#string/title_plan" />
<item
android:id="#+id/navigation_placeholder"
android:title="" />
<item
android:id="#+id/navigation_diet"
android:icon="#drawable/ic_diet"
android:title="#string/title_diet" />
<item
android:id="#+id/navigation_profile"
android:icon="#drawable/ic_profile"
android:title="#string/title_profile" />
</menu>
private fun disableCenterItem(){
val navView = findViewById(R.id.nav_view)
val menuNav = navView.menu
val placeHolderItem = menuNav.findItem(R.id.navigation_placeholder)
placeHolderItem.isEnabled = false
}

Please add to in your menu xml 3 rd position item shown below
<item
android:id="#+id/page_3"
android:enabled="false"
android:title=""
/>

Android Bottom Navigation Menu with 4 items

I am trying to get 4 items on my bottom menu, but the 4th one isn't animating, should I switch to an entirely different menu format, I thought that this menu type would support 3-5 items.
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/navigation_home"
android:icon="#mipmap/news_icon"
android:title="#string/title_news" />
<item
android:id="#+id/navigation_dashboard"
android:icon="#drawable/ic_dashboard_black_24dp"
android:title="#string/title_schedule" />
<item
android:id="#+id/navigation_notifications"
android:icon="#drawable/ic_notifications_black_24dp"
android:title="#string/title_team" />
<item
android:id="#+id/login"
android:icon="#drawable/ic_notifications_black_24dp"
android:title="#string/title_team" />
</menu>
Main Activity code
<?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:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.tibblist.attkapp.MainActivity">
<FrameLayout
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="?android:attr/windowBackground"
app:menu="#menu/navigation" />
</LinearLayout>

I made a dumb mistake turns out I wasn't returning true for that switch statement in my onNavigationItemSelected function.