问题
I have implemented the bottom navigation view in my app and I have looked every where to display badges on top of the icons like this I was wondering whether this is even possible to implement. Any help is appreciated. Thank you.
回答1:
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
回答2:
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
回答3:
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>
回答4:
EDIT 2:
BottomNavigationView now supports showing badge natively as shown here.
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
回答5:
Update: now material support badge, see more below
material baging
bottom navigation
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>
回答6:
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
回答7:
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.showBadge(R.id.ticketsNavigation)
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>
回答8:
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;
}
});
回答9:
@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)
回答10:
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>
回答11:
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/();
回答12:
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)
}
回答13:
you can use this library .. to add badge on navigation bar
https://github.com/ahmedewess/Badged-BottomNavigationBar
来源：https://stackoverflow.com/questions/42682855/display-badge-on-top-of-bottom-navigation-bars-icon