在滚动条上显示和隐藏BottomAppBar [英] Showing and hiding BottomAppBar on scroll

问题描述

我正在尝试实现BottomAppBar，在那里我将处理WebView的导航.

I'm trying to implement BottomAppBar where I would handle the navigation of a WebView.

<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">

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <WebView
            android:id="@+id/web_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <com.google.android.material.bottomappbar.BottomAppBar
        android:id="@+id/bottom_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:layout_behavior="com.google.android.material.bottomappbar.BottomAppBar$Behavior"
        app:hideOnScroll="true"
        app:fabAttached="true"
        app:fabAlignmentMode="end"
        app:layout_scrollFlags="scroll|enterAlways"/>

</android.support.design.widget.AppBarLayout>

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_share"
    android:tint="#fff"
    app:layout_anchor="@id/bottom_bar"
    app:backgroundTint="@color/colorPrimary"/>

一切正常，但是我希望能够在用户分别上下滚动时显示和隐藏BottomAppBar，就像行为

Everything works fine but I want to be able to show and hide the BottomAppBar when the users scrolls down and up respectively just as is the behavior here.

我在任何地方都找不到教程，所以有人在上面实现了解决方案吗?

I couldn't find a tutorial on that anywhere so has someone implemented a solution on it?

推荐答案

尝试设置app:hideOnScroll而不设置app:layout_behavior或app:layout_scrollFlags.并删除AppBarLayout父视图，使BottomAppBar只是CoordinatorLayout的直接子代.

Try settting app:hideOnScroll without setting app:layout_behavior or app:layout_scrollFlags. And remove the AppBarLayout parent view so the BottomAppBar is just a direct child of the CoordinatorLayout.

这篇关于在滚动条上显示和隐藏BottomAppBar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！