android - 如何显示带有抽屉导航菜单项的指示器

Question

我正在尝试显示带有一些相关菜单项的计数指示器。我该怎么做呢？我尝试为菜单项创建 TextView 子项，但它们似乎不起作用。这是我想要实现的模型(请参阅 Gallery 选项旁边的通知程序)

Answer 1

如果你正在使用NavigationView

NavigationView provides a convenient way to build a navigation drawer, including the ability to creating menu items using a menu XML file. We’ve expanded the functionality possible with the ability to set custom views for items via app:actionLayout or using MenuItemCompat.setActionView().

---

例子

<android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header"
    app:menu="@menu/drawer_menu" />

抽屉菜单.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <group android:checkableBehavior="single">
        <item android:id="@+id/nav_item1"
            app:showAsAction="always"
            android:title=""
            app:actionLayout="@layout/menu_item_layout" />
    </group>
</menu>

menu_item_layout.xml

你可以随意定制

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

    <TextView android:id="@+id/tv_title"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:text="Item text" />
</RelativeLayout>