SmoothBottomBar

A lightweight Android material bottom navigation bar library, available as a classic View and as a fully native Jetpack Compose composable.

GIF

Design Credits

All design and inspiration credits belong to Alejandro Ausejo.

Jetpack Compose

A fully Compose-native SmoothBottomBar composable, functionally equivalent to the View version below. It's a controlled component — the caller owns selectedIndex and reacts to onItemSelected/onItemReselected.

val items = listOf(
    SmoothBarItem(icon = painterResource(R.drawable.ic_dashboard_white_24dp), label = "Dashboard"),
    SmoothBarItem(icon = painterResource(R.drawable.ic_multiline_chart_white_24dp), label = "Leaderboard"),
    SmoothBarItem(icon = painterResource(R.drawable.ic_store_white_24dp), label = "Store", hasBadge = true),
    SmoothBarItem(icon = painterResource(R.drawable.ic_person_outline_white_24dp), label = "Profile"),
)

var selectedIndex by remember { mutableStateOf(0) }

SmoothBottomBar(
    items = items,
    selectedIndex = selectedIndex,
    onItemSelected = { selectedIndex = it },
    modifier = Modifier.fillMaxWidth().height(76.dp),
    backgroundColor = Color(0xFF432FBF),
)

See app/src/main/java/me/ibrahimsn/app/ComposeMainActivity.kt for a full example wired up to navigation-compose.

Parameters

View

• Create menu.xml under your res/menu/ folder

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/item0"
        android:title="@string/menu_dashboard"
        android:icon="@drawable/ic_dashboard_white_24dp"/>

    <item
        android:id="@+id/item1"
        android:title="@string/menu_leaderboard"
        android:icon="@drawable/ic_multiline_chart_white_24dp"/>

    <item
        android:id="@+id/item2"
        android:title="@string/menu_store"
        android:icon="@drawable/ic_store_white_24dp"/>

    <item
        android:id="@+id/item3"
        android:title="@string/menu_profile"
        android:icon="@drawable/ic_person_outline_white_24dp"/>

</menu>

• Add view into your layout file

<me.ibrahimsn.smoothbottombar.SmoothBottomBar
    android:id="@+id/bottomBar"
    android:layout_width="match_parent"
    android:layout_height="70dp"
    app:backgroundColor="@color/colorPrimary"
    app:badgeColor="@color/colorBadge"
    app:menu="@menu/menu_bottom"/>

• Use SmoothBottomBar callbacks in your activity

bottomBar.onItemSelected = {
    status.text = "Item $it selected"
}

bottomBar.onItemReselected = {
    status.text = "Item $it re-selected"
}

OR

bottomBar.setOnItemSelectedListener(object: OnItemSelectedListener {
    override fun onItemSelect(pos: Int): Boolean {
        status.text = "Item $pos selected"
        return true
    }
})

bottomBar.setOnItemReselectedListener(object: OnItemReselectedListener {
    override fun onItemReselect(pos: Int) {
        status.text = "Item $pos re-selected"
    }
})

Note: For projects without kotlin, you may need to add org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion to your dependencies since this is a Kotlin library.

Use SmoothBottomBar with Navigation Components.

Coupled with the Navigation Component from the Android Jetpack, SmoothBottomBar offers easier navigation within your application by designating navigation to the Navigation Component. This works best when using fragments, as the Navigation component helps to handle your fragment transactions.

• Setup Navigation Component i.e. Add dependenccy to your project, create a Navigation Graph etc.
• For each Fragment in your Navigation Graph, ensure that the Fragment's id is the same as the MenuItems in your Menu i.e res/menu/ folder

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/first_fragment"
        android:title="@string/menu_dashboard"
        android:icon="@drawable/ic_dashboard_white_24dp"/>

    <item
        android:id="@+id/second_fragment"
        android:title="@string/menu_leaderboard"
        android:icon="@drawable/ic_multiline_chart_white_24dp"/>

    <item
        android:id="@+id/third_fragment"
        android:title="@string/menu_store"
        android:icon="@drawable/ic_store_white_24dp"/>

    <item
        android:id="@+id/fourth_fragment"
        android:title="@string/menu_profile"
        android:icon="@drawable/ic_person_outline_white_24dp"/>

</menu>

Navigation Graph i.e res/navigation/ folder

<?xml version="1.0" encoding="utf-8"?>
<navigation 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/nav_graph"
    app:startDestination="@id/first_fragment">

    <fragment
        android:id="@+id/first_fragment"
        android:name="me.ibrahimsn.app.FirstFragment"
        android:label="Dashboard"
        tools:layout="@layout/fragment_first" >
        <action
            android:id="@+id/action_firstFragment_to_secondFragment"
            app:destination="@id/second_fragment" />
    </fragment>
    <fragment
        android:id="@+id/second_fragment"
        android:name="me.ibrahimsn.app.SecondFragment"
        android:label="Leaderboard"
        tools:layout="@layout/fragment_second" >
        <action
            android:id="@+id/action_secondFragment_to_thirdFragment"
            app:destination="@id/third_fragment" />
    </fragment>
    <fragment
        android:id="@+id/third_fragment"
        android:name="me.ibrahimsn.app.ThirdFragment"
        android:label="Store"
        tools:layout="@layout/fragment_third" >
        <action
            android:id="@+id/action_thirdFragment_to_fourthFragment"
            app:destination="@id/fourth_fragment" />
    </fragment>
    <fragment
        android:id="@+id/fourth_fragment"
        android:name="me.ibrahimsn.app.FourthFragment"
        android:label="Profile"
        tools:layout="@layout/fragment_fourth" />
</navigation>

• In your activity i.e MainActivity, create an instance of PopupMenu which takes a context and an anchor(pass in null) and then inflate this PopupMenu with the layout menu for the SmoothBottomBar.
• Get a reference to your SmoothBottomBar and call setupWithNavController() which takes in a Menu and NavController, pass in the menu of the previously instantiated PopupMenu i.e.(popUpMenu.menu) and your NavController.
• Preferably set this up in a function as shown below and call this function i.e. (setupSmoothBottomMenu()) in the onCreate method of your activity.

N.B: Sample app makes use of ViewBinding to get reference to views in the layout.

   private fun setupSmoothBottomMenu() {
        binding.bottomBar.setupWithNavController(navController)
   }

ActionBar

You can also setup your ActionBar with the Navigation Component by calling setupActionBarWithNavController and pass in your NavController.

N.B: Your app needs to have a Toolbar for setupActionBarWithNavController to work. If your app theme doesn't have a Toolbar i.e. (Theme.AppCompat.Light.NoActionBar) you would need to:

• Add one to your layout i.e.

 <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/app_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">
        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolBar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </com.google.android.material.appbar.AppBarLayout>

• Set the support action bar to your Toolbar using setSupportActionBar(your_toolbar_id) in this case setSupportActionBar(binding.toolBar)

We now have something like this:

 private lateinit var navController: NavController
 private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        navController = findNavController(R.id.main_fragment)
        setupActionBarWithNavController(navController)
        setupSmoothBottomMenu()
    }
    
    private fun setupSmoothBottomMenu() {
        binding.bottomBar.setupWithNavController(navController)
    }

    //set an active fragment programmatically
    fun setSelectedItem(pos:Int){
        binding.bottomBar.setSelectedItem(pos)
    }
    //set badge indicator
    fun setBadge(pos:Int){
        binding.bottomBar.setBadge(pos)
    }
    //remove badge indicator
    fun removeBadge(pos:Int){
        binding.bottomBar.removeBadge(pos)
    }

    override fun onSupportNavigateUp(): Boolean {
        return navController.navigateUp() || super.onSupportNavigateUp()
    }

Result Demo:

Update [8th May, 2021]

Prior to the initial addition of this feature, you can now inflate separate menu items for the SmoothBottomBar and your Toolbar.

• Create the menu item you want to inflate in the Toolbar i.e.

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/another_item_1"
        android:title="Another Item 1" />
    <item
        android:id="@+id/another_item_2"
        android:title="Another Item 2" />
    <item
        android:id="@+id/another_item_3"
        android:title="Another Item 3" />
</menu>

• Override OnCreateOptionsMenu and onOptionsItemSelected (ensure it returns super.onOptionsItemSelected(item)). Now we have:

  class MainActivity : AppCompatActivity() {
    private lateinit var navController: NavController
    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        navController = findNavController(R.id.main_fragment)
        setupActionBarWithNavController(navController)
        setupSmoothBottomMenu()
    }

    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.another_menu, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            R.id.another_item_1 -> {
                showToast("Another Menu Item 1 Selected")
            }

            R.id.another_item_2 -> {
                showToast("Another Menu Item 2 Selected")
            }

            R.id.another_item_3 -> {
                showToast("Another Menu Item 3 Selected")
            }
        }
        return super.onOptionsItemSelected(item)
    }


    private fun showToast(msg: String) {
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show()
    }

    private fun setupSmoothBottomMenu() {
        binding.bottomBar.setupWithNavController(navController)
    }

    //set an active fragment programmatically
    fun setSelectedItem(pos:Int){
        binding.bottomBar.setSelectedItem(pos)
    }
    //set badge indicator
    fun setBadge(pos:Int){
        binding.bottomBar.setBadge(pos)
    }
    //remove badge indicator
    fun removeBadge(pos:Int){
        binding.bottomBar.removeBadge(pos)
    }

    override fun onSupportNavigateUp(): Boolean {
        return navController.navigateUp() || super.onSupportNavigateUp()
    }
}

Select Bottom Item from any fragment

    buttonId.setOnClickListener {
        (requireActivity() as MainActivity).setSelectedItem(2)
    }

Result Demo:

Customization

<me.ibrahimsn.smoothbottombar.SmoothBottomBar
        android:id="@+id/bottomBar"
        android:layout_width="match_parent"
        android:layout_height="70dp"
        app:menu=""
        app:backgroundColor=""
        app:indicatorColor=""
        app:indicatorRadius=""
        app:cornerRadius=""
        app:corners=""
        app:sideMargins=""
        app:itemPadding=""
        app:itemSpacing=""
        app:textColor=""
        app:badgeColor=""
        app:badgeRadius=""
        app:iconBackgroundColor=""
        app:iconBackgroundPadding=""
        app:itemFontFamily=""
        app:textSize=""
        app:iconSize=""
        app:iconMargin=""
        app:iconTint=""
        app:iconTintActive=""
        app:activeItem=""
        app:duration="" />

Setup

Follow me on Twitter @ibrahimsn98

Requires minSdk 32, compileSdk 37, Kotlin 2.2+, Java 21.

//project label build.gradle
buildscript {
    repositories {
         ....
        maven { url 'https://jitpack.io' }
    }
}

allprojects {
    repositories {
     .......
        maven { url 'https://www.jitpack.io' }
    }
}
//app label build.gradle
dependencies {
        implementation 'com.github.ibrahimsn98:SmoothBottomBar:<version — see JitPack badge above>'
}

Note: The latest tagged release predates the me.ibrahimsn.smoothbottombar package rename and the Compose module — a new tag needs to be cut before those changes are available via JitPack. Until then, build from source (git clone + include ':lib'/include ':compose') to use the code documented on this page.

Demo App

The sample app module has two entry points: ComposeMainActivity (the Jetpack Compose demo above) is the default launcher activity; the classic View-based MainActivity is reachable from its overflow menu.

Contributors ✨

License

MIT License

Copyright (c) 2019 İbrahim Süren

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.