Android支持:设计NavigationView勾选菜单子项 [英] Android support:design NavigationView checked menu sub items

问题描述

我最近开始转换我的 android 应用以使用名为 support:design 的最新支持库.

I have recently started converting my android app to use the latest support library called support:design.

在实现新的 NavigationView 时，我偶然发现了显示所选菜单项的问题.

While implementing the new NavigationView i've stumbled upon a problem displaying the selected menu items.

我的 navdrawer_menu.xml

My navdrawer_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
    <item
        android:id="@+id/navigation_item_home"
        android:icon="@drawable/ic_home_black"
        android:title="@string/navdrawer_item_home" />
</group>

    <item
        android:id="@+id/navigation_subheader"
        android:title="@string/navdrawer_subheader_title1">
        <menu>
            <group android:checkableBehavior="single">
            <item
                android:id="@+id/navigation_sub_item1"
                android:icon="@drawable/ic_home_black"
                android:title="@string/navdrawer_sub_item1" />
            </group>
        </menu>
    </item>
</menu>

接下来，我将菜单项设置为检查我的 onNavigationItemSelected:

Next I set the menu's item to checked in my onNavigationItemSelected:

@Override
public boolean onNavigationItemSelected(final MenuItem menuItem) {

    menuItem.setChecked(true);

    drawerLayout.closeDrawer(GravityCompat.START);
    mDrawerActionHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            displayView(menuItem.getItemId());
        }
    }, DRAWER_CLOSE_DELAY_MS);
    return true;
}

如果我只在标签之间使用普通菜单项，这非常有用，但它不适用于子标题.单击子项目不会将它们设置为选中，直到我单击同一项目两次并且它不会取消选中之前检查过的任何项目.

This works great if I only use normal menu items between the tags but it does not work very well for subheaders. Clicking on sub items wont set them checked untill i've clicked the same item twice and it won't uncheck the any item that checked previously.

它最终看起来像这样:

推荐答案

每个项目都必须在一个组内，因此该组可以控制该项目在用户选择时的视觉行为.试试看:

Every item must be inside a group, so the group can control the item's visual behavor on user select. Try it:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
    <item
        android:id="@+id/navigation_item_home"
        android:icon="@drawable/ic_home_black"
        android:title="@string/navdrawer_item_home" />
    <item
        android:id="@+id/navigation_subheader"
        android:title="@string/navdrawer_subheader_title1">
        <menu>
            <group android:checkableBehavior="single">
            <item
                android:id="@+id/navigation_sub_item1"
                android:icon="@drawable/ic_home_black"
                android:title="@string/navdrawer_sub_item1" />
            </group>
        </menu>
    </item>
</group>
</menu>

这篇关于Android支持:设计NavigationView勾选菜单子项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！