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Edit 2020:

Use BottomNavigation from material components instead, it gives support to add badges on items and many other features out of the box:

https://github.com/material-components/material-components-android/blob/master/docs/components/BottomNavigation.md

Old Answer:

When using support library Bottom Navigation bar, its quite complex to show a badge/notification on menu items. However there are easy solutions to get it done. Such as https://github.com/aurelhubert/ahbottomnavigation

This library is more advanced version of Bottom Navigation bar. And you can set a badge on menu item simply using this code snippet.

bottomNavigation.setNotification(notification, bottomNavigation.getItemsCount() - 1);

And you'll get following result

小开

Using support library BottomNavigationView is difficult. An easy solution is using external components. One easy to handle is: https://github.com/roughike/BottomBar Checking its documentation it's as easy as:

BottomBarTab nearby = bottomBar.getTabWithId(R.id.tab_nearby);
nearby.setBadgeCount(5);


// Remove the badge when you're done with it.
nearby.removeBadge/();

小开

As @zxbin answer. you can check BadgeView and try below code

BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(this);
navigation.setSelectedItemId(R.id.navigation_store);
BottomNavigationMenuView bottomNavigationMenuView =
(BottomNavigationMenuView) navigation.getChildAt(0);
View v = bottomNavigationMenuView.getChildAt(4); // number of menu from left
new QBadgeView(this).bindTarget(v).setBadgeNumber(5);

source from my gist

小开

If you just want to use a stock BottomNavigationView and no third party lib here's how I've done it:

BottomNavigationMenuView bottomNavigationMenuView =
(BottomNavigationMenuView) navigationView.getChildAt(0);
View v = bottomNavigationMenuView.getChildAt(3);
BottomNavigationItemView itemView = (BottomNavigationItemView) v;


View badge = LayoutInflater.from(this)
.inflate(R.layout.notification_badge, itemView, true);

Then here's the layout file:

<merge 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">


<TextView
android:id="@+id/notifications.badge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top|center_horizontal"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:background="@drawable/notification_badge"
android:gravity="center"
android:padding="3dp"
android:text="9+"
android:textColor="@color/white"
android:textSize="11sp" />
</merge>

Then just find TextView by id and set text. @drawable/notification_badge is just a circle shape drawable

小开

You can try this way:

Put a TextView inside the BottomNavigationView for counting (BottomNavigationView is a FrameLayout):

    <android.support.design.widget.BottomNavigationView android:id="@id/bottomMenu" style="@style/bottomMenu">
<TextView android:id="@id/bottomMenuSelectionsNumber" style="@style/bottomMenuSelectionsNumber"/>
</android.support.design.widget.BottomNavigationView>

And style them like this:

<style name="bottomMenu">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">@dimen/toolbarHeight</item>
<item name="android:layout_gravity">center|bottom</item>
<item name="android:background">@color/colorThird</item>
<item name="itemBackground">@drawable/tabs_ripple</item>
<item name="itemIconTint">@drawable/bottom_menu_item_color</item>
<item name="itemTextColor">@drawable/bottom_menu_item_color</item>
<item name="menu">@menu/bottom_menu</item>
</style>


<style name="bottomMenuSelectionsNumber">
<item name="android:text">@string/bottomMenuSelectionsNumber</item>
<item name="android:textSize">@dimen/appSecondFontSize</item>
<item name="android:textColor">@color/white</item>
<item name="android:layout_width">@dimen/bottomMenuSelectionsNumberDim</item>
<item name="android:layout_height">@dimen/bottomMenuSelectionsNumberDim</item>
<item name="android:layout_gravity">right|bottom</item>
<item name="android:layout_marginRight">@dimen/bottomMenuSelectionsNumberMarginR</item>
<item name="android:layout_marginBottom">@dimen/bottomMenuSelectionsNumberMarginB</item>
<item name="android:gravity">center</item>
<item name="android:includeFontPadding">false</item>
<item name="android:background">@drawable/bottom_menu_selections_number_bg</item>
</style>

And bottom_menu_selections_number_bg:

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
<solid android:color="@color/colorAccent"/>
<corners android:radius="@dimen/cornerRadius"/>
</shape>

小开

Update: now material support badge, see more below

material baging

bottom navigation

val badge = bottomNavigation.getOrCreateBadge(menuItemId)
badge.isVisible = true
// An icon only badge will be displayed unless a number is set:
badge.number = 99

Old answer

base on @Tinashe's answer, i'd like badge show as bellow without number:

code:

    override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)


navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
// position = 2
addBadge(POSITION_HISTORY)
}


/**
* add badge(notification dot) to bottom bar
* @param position to get badge container
*/
@SuppressLint("PrivateResource")
private fun addBadge(position: Int) {
// get badge container (parent)
val bottomMenu = navigation.getChildAt(0) as? BottomNavigationMenuView
val v = bottomMenu?.getChildAt(position) as? BottomNavigationItemView


// inflate badge from layout
badge = LayoutInflater.from(this)
.inflate(R.layout.badge_layout, bottomMenu, false)


// create badge layout parameter
val badgeLayout: FrameLayout.LayoutParams = FrameLayout.LayoutParams(badge?.layoutParams).apply {
gravity = Gravity.CENTER_HORIZONTAL
topMargin = resources.getDimension(R.dimen.design_bottom_navigation_margin).toInt()


// <dimen name="bagde_left_margin">8dp</dimen>
leftMargin = resources.getDimension(R.dimen.bagde_left_margin).toInt()
}


// add view to bottom bar with layout parameter
v?.addView(badge, badgeLayout)
}

badge_layout.xml (badge_size=12dp)

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="@dimen/badge_size"
android:layout_height="@dimen/badge_size"
android:background="@drawable/new_notification" />

and drawable background new_notification.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<corners android:radius="100dp"/>
<solid android:color="#F44336"/>
</shape>

小开

EDIT 2:
BottomNavigationView now supports showing badge natively, as said in the doc here.

bottomNavigation.getOrCreateBadge(menuItemId)

I was facing the same issue and I didn't want to use a library.

So I created a custom layout called layout_news_badge:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/badge_frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
    

<TextView
android:id="@+id/badge_text_view"
android:layout_width="19dp"
android:layout_height="19dp"
android:textSize="11sp"
android:textColor="@android:color/white"
android:background="@drawable/news_bottom_nav_bg"
android:layout_gravity="top"
android:layout_marginTop="4dp"
android:layout_marginStart="16dp"
android:gravity="center"
android:padding="2dp"
tools:text="9+" />
</FrameLayout>

TextView background(news_bottom_nav_bg):

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
<solid android:color="?attr/colorPrimary" />
</shape>

Then I created a BottomMenuHelper with this 2 methods:

public static void showBadge(Context context, BottomNavigationView
bottomNavigationView, @IdRes int itemId, String value) {
removeBadge(bottomNavigationView, itemId);
BottomNavigationItemView itemView = bottomNavigationView.findViewById(itemId);
View badge = LayoutInflater.from(context).inflate(R.layout.layout_news_badge, bottomNavigationView, false);
    

TextView text = badge.findViewById(R.id.badge_text_view);
text.setText(value);
itemView.addView(badge);
}


public static void removeBadge(BottomNavigationView bottomNavigationView, @IdRes int itemId) {
BottomNavigationItemView itemView = bottomNavigationView.findViewById(itemId);
if (itemView.getChildCount() == 3) {
itemView.removeViewAt(2);
}
}

Then when I call it in my Activity:

BottomMenuHelper.showBadge(this, mBottomNavigationView, R.id.action_news, "1");

EDIT 1: Added improvement by suggestion jatin rana

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最佳答案

Adding badges is natively supported now, using the latest material dependency add this to your build.gradle

    implementation 'com.google.android.material:material:1.1.0-alpha09'

in your layout add this

<!-- The rest of your layout here ....-->


<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:menu="@menu/bottom_nav_menu"
/>

then you can just

     val navBar  = findViewById<BottomNavigationView>(R.id.bottom_navigation)
navBar.getOrCreateBadge(R.id.action_add).number = 2

R.id.action_add for you would be the id of the menu item you want to put a badge on. Check it from the menu file you feed to the BottomNavigationView.

Make sure your app theme is in Theme.MaterialComponents

you can check it in styles or manifest. for this example mine was this

     <style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="android:statusBarColor" tools:targetApi="lollipop">@color/colorPrimary</item>
</style>

小开

Badge has now been added as a part of AndroidX BottomNavigationView by BadgeDrawable. See docs

fun setBadge(count: Int) {
if (count == 0) {
bottomNavigationView.removeBadge(R.id.ticketsNavigation)
} else {
val badge = bottomNavigationView.getOrCreateBadge(R.id.ticketsNavigation) // previously showBadge
badge.number = count
badge.backgroundColor = getColor(R.color.badge)
badge.badgeTextColor = getColor(R.color.blackTextColor)
}
}


// Menu:
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/ticketsNavigation"
android:icon="@drawable/vector_drawable_navbar_tickets"
android:title="@string/tickets_title"/>
...
</menu>

Edit:

As noted in the comments it should be possible to just update the badge count without needing to add or remove the badge all the time like this:

fun setBadge(count: Int) {
bottomNavigationView.getBadge(menuItemId)?.isVisible = count > 0
}

小开

Please try this once.

1) Create xml file for badge (ex. notification_badge_view.xml)

<FrameLayout 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">


<ImageView
android:id="@+id/badge"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_gravity="top|center_horizontal"
android:layout_marginStart="10dp"
android:gravity="center"
android:padding="3dp"
app:srcCompat="@drawable/notification_badge" />
</FrameLayout>

2) Create drawable file for notification dot shape (ex. badge_circle.xml)

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="@color/colorAccent" />
<stroke
android:width="2dp"
android:color="@android:color/white" />
</shape>

3) In your activity onCreate method add the badge view to BottomNavigationView

    @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_landing);


addBadgeView();


}

4) And the addBadgeView method is below

private void addBadgeView() {
try {
BottomNavigationMenuView menuView = (BottomNavigationMenuView) bottomNavigationBar.getChildAt(0);
BottomNavigationItemView itemView = (BottomNavigationItemView) menuView.getChildAt(0); //set this to 0, 1, 2, or 3.. accordingly which menu item of the bottom bar you want to show badge
notificationBadge = LayoutInflater.from(LandingActivity.this).inflate(R.layout.view_notification_badge, menuView, false);
itemView.addView(notificationBadge);
notificationBadge.setVisibility(GONE);// initially badge will be invisible
} catch (Exception e) {
e.printStackTrace();
}
}

Note: bottomNavigationBar is your bottom bar view.

5) Refresh badge to show and hide by following method

private void refreshBadgeView() {
try {
boolean badgeIsVisible = notificationBadge.getVisibility() != GONE;
notificationBadge.setVisibility(badgeIsVisible ? GONE : VISIBLE);//makes badge visible and invisible
} catch (Exception e) {
e.printStackTrace();
}
}

6) And finely make hide when we clicking on particular bottom bar page by following line.

bottomNavigationBar.setOnNavigationItemSelectedListener(new
BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem)
{
switch (menuItem.getItemId()) {
case R.id.bottom_bar_one:
//while moving to first fragment
notificationBadge.setVisibility(GONE);
break;
case R.id.bottom_bar_two:
//moving to second fragment
break;
case R.id.bottom_bar_three:
//moving to third fragment
break;
}
return true;
}
});

小开

@Abel's answer is the best unless you already have a complex set of themes and don't have the time to change them all.

However, if a) you are pressed for time and if you are using the Google Material library BottomNavigationView Bar or b) you want to add your own custom view badge - then the accepted answer won't work with com.google.android.material:material:1.1.0

You will need to code for a different view hierarchy than the accepted answer

  BottomNavigationItemView itemView = (BottomNavigationItemView) ((BottomNavigationMenuView) mBottomNavigation.getChildAt(0)).getChildAt(2);
View badge = LayoutInflater.from(this).inflate(R.layout.navigation_dot, itemView, false);
itemView.addView(badge);

if you do want to update your theme and update to

com.google.android.material:material:1.1.0-alpha09

then all you need to do instead, is

mBottomNavigation.getOrCreateBadge(R.id.navigation_menu_item_one).setNumber(YOUR_NUMBER);

The remove and number functions are only present in the 1.1.0-alpha09 version (and higher)

小开

Have a look in at the documentation page: https://material.io/develop/android/components/bottom-navigation-view/

TL;DR: They didn't update the correct methods to use, so they left a small error on the documentation. To add or remove a badge do as follows:

// to remove
bottomNavigationView.removeBadge(R.id.action_settings)


// to add
bottomNavigationView.getOrCreateBadge(R.id.action_settings).apply {
//if you want to change other attributes, like badge color, add a number, maximum number (a plus sign is added, e.g. 99+)
number = 100
maxCharactersCount = 3
backgroundColor = ContextCompat.getColor(context, R.color.color_red)
}

小开

i did some changes answer of @ilbose i did in this way and tested small and big screen sizes

../drawable/badge_circle.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
<solid android:color="@color/solid_red_base" />

and ../layout/notifcation_badge.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/badge_frame_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="11dp"
android:layout_gravity="center_horizontal">


<TextView
android:id="@+id/badge_text_view"
android:layout_width="12dp"
android:layout_height="12dp"
android:textSize="11sp"
android:textColor="@android:color/white"
android:background="@drawable/message_badge"
android:layout_gravity="top"
android:layout_centerHorizontal="true"
android:padding="2dp"/> </RelativeLayout>

and in java code

 public static void showBadge(Context context, BottomNavigationView
bottomNavigationView, @IdRes int itemId, String value) {
BottomNavigationItemView itemView = bottomNavigationView.findViewById(itemId);
View badge = LayoutInflater.from(context).inflate(R.layout.message_notification_badge, bottomNavigationView, false);


TextView text = badge.findViewById(R.id.badge_text_view);
text.setText(value);
itemView.addView(badge);
}


public static void removeBadge(BottomNavigationView bottomNavigationView, @IdRes int itemId) {
BottomNavigationItemView itemView = bottomNavigationView.findViewById(itemId);
if (itemView.getChildCount() == 4) {
itemView.removeViewAt(4);
}
}

小开

A simple way:

As Material Design updated their library and according to

https://medium.com/over-engineering/hands-on-with-material-components-for-android-bottom-navigation-aae2aa9066be

I was able to update (or create my BottomNavigationView Badge) from inside my recycler adapter (in a fragment) without any external lib.

Initial State:

So, as in adapter i got the Context from my activity i access it and recover the instance of bottom navigation:

navBottomView = ((AppCompatActivity)this.context).findViewById(R.id.nav_view);

check if the badge is null (not created yet), if is, set it to quantity choosed:

  BadgeDrawable badgeDrawable = navBottomView.getBadge(R.id.navigation_carrinho);
if (badgeDrawable == null)
navBottomView.getOrCreateBadge(R.id.navigation_carrinho).setNumber(item.getQuantidade());

otherwise get the previous quantity and increase the badge value:

int previousValue = badgeDrawable.getNumber();
badgeDrawable.setNumber(previousValue + item.getQuantidade());

Don't forget the imports:

import com.google.android.material.badge.BadgeDrawable;
import com.google.android.material.bottomnavigation.BottomNavigationView;

Final State:

All in One with add to cart button listener:

btnAddCarrinho.setOnClickListener(v -> {
navBottomView = ((AppCompatActivity) this.context).findViewById(R.id.nav_view);
BadgeDrawable badgeDrawable = navBottomView.getBadge(R.id.navigation_carrinho);
if (badgeDrawable == null) {
navBottomView.getOrCreateBadge(R.id.navigation_carrinho).setNumber(item.getQuantidade());
} else {
int previousValue = badgeDrawable.getNumber();
badgeDrawable.setNumber(previousValue + item.getQuantidade());
}
});

小开

Here's a simple way to create & remove badge count with material bottom navigation.

public class BadgeIconHelper {
    

public static void showNotificationBadge(BottomNavigationView
bottomNavigationView, @IdRes int itemId, String value) {
BadgeDrawable badge = bottomNavigationView.getOrCreateBadge(itemId);
badge.setBackgroundColor(ContextCompat.getColor(bottomNavigationView.getContext(), R.color.color_primary));
badge.setBadgeTextColor(ContextCompat.getColor(bottomNavigationView.getContext(), R.color.color_white));
badge.setMaxCharacterCount(3);
badge.setVerticalOffset(2);
badge.setVisible(true);
badge.setNumber(Integer.parseInt(value));
}
    

public static void removeNotificationBadge(BottomNavigationView bottomNavigationView, @IdRes int itemId) {
BadgeDrawable badgeDrawable = bottomNavigationView.getBadge(itemId);
if (badgeDrawable != null) {
badgeDrawable.setVisible(false);
badgeDrawable.clearNumber();
}
}
}

小开

Firstly create a layout file of your badge, then follow these steps

BottomNavigationMenuView menuView = (BottomNavigationMenuView) navigation.getChildAt(0);
 

BottomNavigationItemView itemView = (BottomNavigationItemView) menuView.getChildAt(2);


View messageBadgeView = LayoutInflater.from(this).inflate(R.layout.message_badge_view, menuView, false);
TextView textView = messageBadgeView.findViewById(R.id.counter_badge);
textView.setText("15");


itemView.addView(messageBadgeView);`

小开

If you want only dot without number, then simply you can create bottom navigation using com.google.android.material.bottomnavigation.BottomNavigationView and in java

BottomNavigationView mBtmView = (BottomNavigationView) findViewById(R.id.bottom_navigatin_view);
mBtmView.setOnNavigationItemSelectedListener(this);
mBtmView.getOrCreateBadge(R.id.chatFragment).setBackgroundColor(getResources().getColor(R.color.Red));