在底部导航栏的图标顶部显示徽章

Question

我已经实现了我的应用程序底部的导航视图和我看过的每一个地方上的,如图标上方显示的徽章这个 我不知道这是否是甚至有可能实现.任何帮助表示赞赏.谢谢.

Answer 1

如果您只是想使用股票BottomNavigationView而没有第三方库,我就是这样做的:

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);

然后这是布局文件:

<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>

然后只需TextView通过id和设置文本找到. @drawable/notification_badge只是一个圆形的可绘制的

Answer 2

现在原生支持添加徽章，使用最新的材料依赖关系将其添加到build.gradle

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

在您的布局中添加此

<!-- 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"
            />

那你就可以

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

R.id.action_add将成为您要添加徽章的菜单项的ID。从您提供给BottomNavigationView的菜单文件中进行检查。

确保您的应用程序主题位于Theme.MaterialComponents中

您可以按样式或清单检查它。在这个例子中我的是

     <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>

Answer 3

我面临同样的问题,我不想使用图书馆.

所以我创建了一个自定义布局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>

然后我BottomMenuHelper用这两种方法创建了一个:

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);
    }
}

然后当我在我的活动中调用它时:

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

Answer 4

使用支持库底部导航栏时,在菜单项上显示徽章/通知非常复杂.但是,有一些简单的解决方案可以完成它.例如 https://github.com/aurelhubert/ahbottomnavigation

此库是底部导航栏的更高级版本.您只需使用此代码段即可在菜单项上设置徽章.

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

你会得到以下结果

Answer 5

BadgeDrawable 现在已将 Badge 添加为 AndroidX BottomNavigationView 的一部分。 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：

正如评论中所指出的，应该可以只更新徽章计数，而无需像这样一直添加或删除徽章：

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

Answer 6

根据@ Tinashe的回答,我想将徽章显示为没有数字的贝尔风:

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)
    }

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" />

和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>

Answer 7

正如@zxbin的回答.你可以检查BadgeView并尝试下面的代码

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);

来自我的要点

Answer 8

一个简单的方法：

随着 Material Design 更新了他们的库，并根据

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

我能够在没有任何外部 lib 的情况下从我的回收器适配器内部（在片段中）更新（或创建我的 BottomNavigationView Badge）。

初始状态：

所以，就像在适配器中一样，我从我的活动中获得了上下文，我访问它并恢复底部导航的实例：

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

检查徽章是否为空（尚未创建），如果是，则将其设置为所选数量：

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

否则获取之前的数量并增加徽章值：

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：

多合一添加到购物车按钮侦听器：

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());
            }
        });

Answer 9

请尝试一次。

1）为徽章创建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）为通知点形状创建可绘制文件（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) 在您的活动 onCreate 方法中，将徽章视图添加到BottomNavigationView

    @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();
        }
    }

注意：bottomNavigationBar 是您的底部栏视图。

5) 通过以下方法刷新徽章以显示和隐藏

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）当我们点击特定的底部栏页面时，按照以下行精细地隐藏。

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;
            }
        });