我已经在我的应用程序中实现了底部导航视图,并且我已经搜索了所有地方来显示像这样在图标上方显示徽章。 我想知道是否有可能实现。任何帮助都将不胜感激。 谢谢。
我已经在我的应用程序中实现了底部导航视图,并且我已经搜索了所有地方来显示像这样在图标上方显示徽章。 我想知道是否有可能实现。任何帮助都将不胜感激。 谢谢。
这个答案在2020年2月被MDC v1.1.0取代了。
更新的示例,来自文档:
final var badge = bottomNavigation.getOrCreateBadge(menuItemId);
badge.isVisible = true;
// An icon only badge will be displayed unless a number is set:
badge.number = 99;
如果你只想使用原始的BottomNavigationView
而不使用第三方库,这是我所做的:
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);
那么这就是布局文件:
<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>
然后通过id找到TextView
并设置文本。
@drawable/notification_badge
只是一个圆形形状的可绘制对象。
public void removeBadge(BottomNavigationView navigationView, int index) {
BottomNavigationMenuView bottomNavigationMenuView =
(BottomNavigationMenuView) navigationView.getChildAt(0);
View v = bottomNavigationMenuView.getChildAt(index);
BottomNavigationItemView itemView = (BottomNavigationItemView) v;
itemView.removeViewAt(itemView.getChildCount()-1);
}
- Nilesh RathoreitemView.removeViewAt(itemView.getChildCount()-1);
,我使用了以下代码:View badge = itemView.findViewById(R.id.notifications_badge); ((ViewGroup)badge.getParent()).removeView(badge);
- JamTheMan现在可以通过使用最新的Material依赖项来本地支持添加徽章。将以下内容添加到你的build.gradle文件中。
implementation 'com.google.android.material:material:1.1.0-alpha09'
在你的布局中添加这个
<!-- 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"
/>
那么你只需要
val navBar = findViewById<BottomNavigationView>(R.id.bottom_navigation)
navBar.getOrCreateBadge(R.id.action_add).number = 2
R.id.action_add对于你来说将是你想在其上放置徽章的菜单项的ID。请从您提供给BottomNavigationView的菜单文件中检查它。
确保您的应用程序主题处于Theme.MaterialComponents中。
您可以在样式或清单中进行检查。 对于此示例,我的是这个
<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>
Theme.MaterialComponents.*.Bridge
变体来进行直接转换,无需重新设置任何样式就可以保留原有的样式,详见链接:https://medium.com/over-engineering/setting-up-a-material-components-theme-for-android-fbf7774da739 - ChrisPrime2020年修订版:
请改用材料组件中的
BottomNavigation
, 它支持添加徽章和其他许多功能:
旧答案:
使用支持库底部导航栏, 在菜单项上显示徽标/通知相当复杂. 然而有简单的解决方案. 比如https://github.com/aurelhubert/ahbottomnavigation
这个库是底部导航栏的更高级版本,您可以使用此代码片段简单地设置菜单项上的徽标。
bottomNavigation.setNotification(notification, bottomNavigation.getItemsCount() - 1);
然后你将会得到以下的结果
EDIT 2:
根据文档这里所述,BottomNavigationView现在原生支持显示徽章。
bottomNavigation.getOrCreateBadge(menuItemId)
我遇到了同样的问题,但我不想使用库。
所以我创建了一个名为layout_news_badge
的自定义布局:
<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 背景(news_bottom_nav_bg
):
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
<solid android:color="?attr/colorPrimary" />
</shape>
接着我创建了一个名为BottomMenuHelper
的类,并添加了以下两个方法:
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);
}
}
然后当我在我的Activity中调用它时:
BottomMenuHelper.showBadge(this, mBottomNavigationView, R.id.action_news, "1");
编辑 1: 根据jatin rana的建议,进行了改进。
showBadge
之前调用 removeBadge
,以避免添加重复视图。 - jatin rana更新:现在有材料支持徽章,请参见下文
val badge = bottomNavigation.getOrCreateBadge(menuItemId)
badge.isVisible = true
// An icon only badge will be displayed unless a number is set:
badge.number = 99
旧回答
基于 @Tinashe 的回答,我想要徽章展示如下,不带数字:
代码:
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)
}
徽章布局文件(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" />
和可绘制的背景新通知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>
badge.isVisible = true
不起作用。badge.setVisible(true);
是可行的。 - Handelika现在Badge已经作为AndroidX BottomNavigationView的一部分,由BadgeDrawable实现。
查看文档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>
编辑:
如评论中所述,应该可以只更新徽章计数,而不需要像这样一直添加或删除徽章:
fun setBadge(count: Int) {
bottomNavigationView.getBadge(menuItemId)?.isVisible = count > 0
}
showBadge
已更改为getOrCreateBadge
。 - Morten Holmgaard根据 @zxbin 的回答,您可以查看 BadgeView 并尝试以下代码
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);
源自我的代码片段
随着Material Design更新了他们的库,根据https://medium.com/over-engineering/hands-on-with-material-components-for-android-bottom-navigation-aae2aa9066be所述,我能够在我的RecyclerView适配器(在Fragment中)内部更新(或创建我的BottomNavigationView Badge)而不需要任何外部库。
因此,在适配器中,我从我的Activity中获取上下文并访问底部导航栏的实例:
navBottomView = ((AppCompatActivity)this.context).findViewById(R.id.nav_view);
检查徽章是否为空(尚未创建),如果是,则将其设置为所选择的数量:
BadgeDrawable badgeDrawable = navBottomView.getBadge(R.id.navigation_carrinho);
if (badgeDrawable == null)
navBottomView.getOrCreateBadge(R.id.navigation_carrinho).setNumber(item.getQuantidade());
int previousValue = badgeDrawable.getNumber();
badgeDrawable.setNumber(previousValue + item.getQuantidade());
不要忘记导入:
import com.google.android.material.badge.BadgeDrawable;
import com.google.android.material.bottomnavigation.BottomNavigationView;
最终状态:
一体化,带有加入购物车按钮监听器:
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());
}
});
1) 创建徽章的XML文件(例如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) 创建通知点形状的可绘制文件(例如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) 在你的Activity的onCreate方法中,将徽章视图添加到BottomNavigationView中。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_landing);
addBadgeView();
}
4) addBadgeView方法如下:
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();
}
}
private void refreshBadgeView() {
try {
boolean badgeIsVisible = notificationBadge.getVisibility() != GONE;
notificationBadge.setVisibility(badgeIsVisible ? GONE : VISIBLE);//makes badge visible and invisible
} catch (Exception e) {
e.printStackTrace();
}
}
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;
}
});
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();
}
}
}