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TransparentBottomBar

A lightweight Android material bottom navigation bar library

API Android Arsenal Android Weekly

GIF

Usage

  • 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.gozirin.TransparentBottomBar
    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) {
        status.text = "Item $pos selected"
    }
})

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.smoothbottombar.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.smoothbottombar.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.smoothbottombar.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.smoothbottombar.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:

  • 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.gozirin.TransparentBottomBar
        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:textColor=""
        app:badgeColor=""
        app:itemFontFamily=""
        app:textSize=""
        app:iconSize=""
        app:iconTint=""
        app:iconTintActive=""
        app:activeItem=""
        app:duration="" />

Setup

//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:1.7.9'
}