如何以编程方式显示/隐藏BottomAppBar? [英] How to show/hide BottomAppBar programmatically?

问题描述

我尝试使用BottomAppBar，并且希望能够像AppBarLayout中的setExpanded一样以编程方式隐藏或显示它.

I try to use an BottomAppBar and I would like to be able to hide or show it programmatically like a setExpanded in an AppBarLayout.

我的布局就像

<androidx.coordinatorlayout.widget.CoordinatorLayout
    android:id="@+id/coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
          ...
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.core.widget.NestedScrollView
        android:id="@+id/nested"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <fragment
            android:id="@+id/navHost"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:defaultNavHost="true"
            app:navGraph="@navigation/home_nav" />
    </androidx.core.widget.NestedScrollView>

    <com.google.android.material.bottomappbar.BottomAppBar
        android:id="@+id/bottomAppBar"
        style="@style/Widget.MaterialComponents.BottomAppBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:backgroundTint="@color/colorPrimary"
        app:fabAlignmentMode="center"
        app:hideOnScroll="true"
        app:layout_scrollFlags="scroll|enterAlways"
        app:navigationIcon="@drawable/ic_menu"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

我尝试使用AppBottomBar的行为，但是它不起作用.

I tried to use the behavior of the AppBottomBar but it doesn't work.

推荐答案

在底部应用栏上调用performShow()和performHide()即可完成所需的操作.

Calling performShow() and performHide() on the bottom app bar will do what you want.

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