Bottom navigation view with custom item (actionLayout)

问题

I would like to add a custom item in the new BottomNavigationView .

There are plenty of tutorial of adding a custom view with the normal navigation view but I can't find anything regarding the bottom one.

This is my view

   <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:menu="@menu/menu_main" />

And this is the menu

<?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">

<item
    android:id="@+id/menu_one"
    android:icon="@drawable/ic_tab_one"
    android:title="one" />
<item
    android:id="@+id/menu_two"
    app:actionLayout="@layout/item_action_notification"
    android:title="two" />

As you can see I put actionLayout tag as you would do normally, but it is simply not displayed.

Any ideas? Thanks.

回答1:

Hope the below solution will help.

1. Create a layout : layout/_custom_cart_item_layout.xml

   <?xml version="1.0" encoding="utf-8"?>
   <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent">
   
   <TextView
   android:id="@+id/cart_badge"
   android:layout_width="20dp"
   android:layout_height="20dp"
   android:layout_gravity="top|center_horizontal"
   android:layout_marginLeft="10dp"
   android:background="@drawable/circle"
   android:backgroundTint="@color/colorAccent"
   android:gravity="center"
   android:text="0"
   android:textColor="@android:color/white"
   android:textSize="12sp" />
   
   </FrameLayout>
   

2. drawable/circle

   <?xml version="1.0" encoding="utf-8"?>
   <shape xmlns:android="http://schemas.android.com/apk/res/android" 
   android:shape="oval">
   <solid android:color="@color/white"/>
   <size android:width="40dp" android:height="40dp" />
   </shape>
   

3. MainActivity : layout/main_activity.xml

   <?xml version="1.0" encoding="utf-8"?>
   <android.support.constraint.ConstraintLayout
   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:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context="com.MainActivity">
   
   <android.support.design.widget.BottomNavigationView
   android:id="@+id/bot_nav"
   android:layout_width="0dp"
   android:layout_height="56dp"
   android:background="@color/white"
   android:elevation="2dp"
   app:layout_constraintBottom_toBottomOf="parent"
   app:layout_constraintEnd_toEndOf="parent"
   app:layout_constraintStart_toStartOf="parent"
   app:menu="@menu/bottom_menu" />
   
   </android.support.constraint.ConstraintLayout>
   

4. menu : menu/bottom_menu.xml

   <?xml version="1.0" encoding="utf-8"?>
   <menu xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:android="http://schemas.android.com/apk/res/android">
   
   <item
   android:id="@+id/menu_home"
   android:icon="@drawable/home24"
   android:title="Home" />
   
   <item
   android:id="@+id/menu_cart"
   android:icon="@drawable/shoppingcart24"
   android:title="Cart" />
   <item
   android:id="@+id/menu_acct"
   android:icon="@drawable/user24"
   android:title="Account" />
   </menu>
   

5. In your MainActivity class within onCreate

   BottomNavigationView mbottomNavigationView =findViewById(R.id.bot_nav);
   
   BottomNavigationMenuView mbottomNavigationMenuView =
   (BottomNavigationMenuView) mbottomNavigationView.getChildAt(0);
   
   View view = mbottomNavigationMenuView.getChildAt(1);
   
   BottomNavigationItemView itemView = (BottomNavigationItemView) view;
   
   View cart_badge = LayoutInflater.from(this)
   .inflate(R.layout._custom_cart_item_layout,
    mbottomNavigationMenuView, false);
   
   itemView.addView(cart_badge);
   

Output : Image

Hope it will work similar for you.

Thank you

来源：https://stackoverflow.com/questions/42653955/bottom-navigation-view-with-custom-item-actionlayout