我已将Android Studio从2019年8月9日更新到3.5版。我试图使用Navigation Component熟悉导航抽屉的新想法。我创建了新项目,并在开始时选择了“导航抽屉活动”。之后,我尝试运行该应用程序以查看是否一切正常,但抽屉菜单不起作用。抽屉打开了,但是当我单击任何可用的物品时,只是合上了抽屉,没有打开适当的碎片。我还尝试将其他片段设置为“启动目标”,并且可以正常工作,正确的片段可以在启动时正确打开,但是抽屉菜单仍然无法正常工作。
我想念什么?我该如何运作?
代码直接来自全新的导航抽屉活动:
activity_main:
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<com.google.android.material.navigation.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_main"
app:menu="@menu/activity_main_drawer" />
<include
layout="@layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.drawerlayout.widget.DrawerLayout>
app_bar_main:
<androidx.coordinatorlayout.widget.CoordinatorLayout 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=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
app:srcCompat="@android:drawable/ic_dialog_email" />
<include layout="@layout/content_main" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
content_main:
<androidx.constraintlayout.widget.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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/app_bar_main">
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
activity_main_drawer:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_home"
android:icon="@drawable/ic_menu_camera"
android:title="@string/menu_home" />
<item
android:id="@+id/nav_gallery"
android:icon="@drawable/ic_menu_gallery"
android:title="@string/menu_gallery" />
<item
android:id="@+id/nav_slideshow"
android:icon="@drawable/ic_menu_slideshow"
android:title="@string/menu_slideshow" />
<item
android:id="@+id/nav_tools"
android:icon="@drawable/ic_menu_manage"
android:title="@string/menu_tools" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="@+id/nav_share"
android:icon="@drawable/ic_menu_share"
android:title="@string/menu_share" />
<item
android:id="@+id/nav_send"
android:icon="@drawable/ic_menu_send"
android:title="@string/menu_send" />
</menu>
</item>
</menu>
mobile_navigation:
<navigation 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:id="@+id/mobile_navigation"
app:startDestination="@+id/nav_home">
<fragment
android:id="@+id/nav_home"
android:name="com.broadenup.test.ui.home.HomeFragment"
android:label="@string/menu_home"
tools:layout="@layout/fragment_home" />
<fragment
android:id="@+id/nav_gallery"
android:name="com.broadenup.test.ui.gallery.GalleryFragment"
android:label="@string/menu_gallery"
tools:layout="@layout/fragment_gallery" />
<fragment
android:id="@+id/nav_slideshow"
android:name="com.broadenup.test.ui.slideshow.SlideshowFragment"
android:label="@string/menu_slideshow"
tools:layout="@layout/fragment_slideshow" />
<fragment
android:id="@+id/nav_tools"
android:name="com.broadenup.test.ui.tools.ToolsFragment"
android:label="@string/menu_tools"
tools:layout="@layout/fragment_tools" />
<fragment
android:id="@+id/nav_share"
android:name="com.broadenup.test.ui.share.ShareFragment"
android:label="@string/menu_share"
tools:layout="@layout/fragment_share" />
<fragment
android:id="@+id/nav_send"
android:name="com.broadenup.test.ui.send.SendFragment"
android:label="@string/menu_send"
tools:layout="@layout/fragment_send" />
</navigation>