带有自定义项目的底部导航视图(actionLayout)

Question

我想在新的BottomNavigationView中添加一个自定义项.

有很多关于使用普通导航视图添加自定义视图的教程,但我找不到有关底部视图的任何内容.

这是我的观点

   <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" />

这是菜单

<?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" />

正如你所看到的那样,我按正常方式放置了actionLayout标签,但它根本就没有显示出来.

有任何想法吗？谢谢.

Answer 1

希望以下解决方案有所帮助.

1. 创建布局: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. 绘制/圈

   <?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. 在onCreate中的MainActivity类中

   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);
   

输出:图像

希望它能为您提供类似的功能.

谢谢