我创建了一个DrawerNavigation,它的MenuItem(主页)具有一个BottomNavigationBar。对于BottomNavigationBar中的MenuItem“Hinzufügen”,我在相应的片段(AddFragment.java)
AddFragment.java
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
}
setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
menu.clear();
inflater.inflate(R.menu.save_toolbar_menu, menu);
}
所有其他片段的工具栏项将在MainActivity中膨胀:
MainActivity.java
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.toolbar_menu, menu);
return super.onCreateOptionsMenu(menu);
}
问题:
当我在BottomNavigationBar项目之间切换时,工具栏菜单将按预期工作。就是说,“Hinzufüen”菜单显示R.menu.save_toolbar_menu
,当我选择另一个MenuItem时,R.menu.toolbar_menu
将膨胀到工具栏中。
Selected another BottomNavigationitem
但是:当我在BottomNavigationBar中选择“Hinzufügen”,然后从DrawerNavigation中选择一个MenuItem时(让我们说“ Einstellungen”时),工具栏菜单将不会恢复,或者R.menu.toolbar_menu
不会再次膨胀。仅当我在BottomnavigationBar菜单之间进行切换时,此功能才正确。
save_toolbar_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/toolbar_nav_cancel"
android:title="@string/title_cancel"
app:showAsAction="always" />
<item
android:id="@+id/toolbar_nav_save"
android:title="@string/title_save"
app:showAsAction="ifRoom" />
</menu>
toolbar_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/toolbar_nav_fav"
android:icon="@drawable/ic_favorite_white"
android:title="@string/title_fav"
app:showAsAction="ifRoom" />
</menu>
app_bar_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.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">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.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" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/main_content" />
</android.support.design.widget.CoordinatorLayout>
main_content.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:context=".MainActivity"
tools:showIn="@layout/app_bar_main">
<FrameLayout
android:id="@+id/main_content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true" />
</RelativeLayout>
fragment_home.xml
<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=".HomeFragment">
<FrameLayout
android:id="@+id/home_frame"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="@+id/home_navigation"
app:layout_constraintBottom_toTopOf="@+id/home_navigation"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.design.widget.BottomNavigationView
android:id="@+id/home_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="@color/colorPrimary"
app:itemBackground="@color/colorPrimary"
app:itemIconTint="@color/bottom_nav_colors"
app:itemTextColor="@color/bottom_nav_colors"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/bottom_navigation_menu" />
</android.support.constraint.ConstraintLayout>