Android 如何在折叠工具栏布局中隐藏工具栏？

使用折叠工具栏布局实现了具有图像模式的灵活空间。我遇到了这样一个问题：不管工具栏处于什么样的折叠状态，工具栏布局仍然固定在顶部

    <?xml version="1.0" encoding="utf-8"?>
<layout 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">

    <data>

    </data>

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/event_management_coordinator_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:context="com.butterflyinnovations.collpoll.postmanagement.share.event.eventManagement.EventManagementActivity">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/event_management_appbar"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:theme="@style/AppTheme.AppBarOverlay">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/event_management_collapsing_toolbar"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="true"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginEnd="64dp"
                app:expandedTitleMarginStart="48dp"
                app:layout_scrollFlags="scroll|enterAlways|exitUntilCollapsed"
                app:toolbarId="@id/toolbar">

                <ImageView
                    android:id="@+id/event_management_collapsing_image"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:contentDescription="@string/default_content_description"
                    android:fitsSystemWindows="true"
                    android:scaleType="centerCrop"
                    app:layout_collapseMode="parallax"
                    android:src="@color/blue"/>

                <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="?android:attr/actionBarSize"
                    app:contentInsetStartWithNavigation="0dp"
                    app:layout_collapseMode="pin"
                    app:layout_scrollFlags="scroll|enterAlways"
                    app:popupTheme="@style/AppTheme.PopupOverlay" />

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

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

        <FrameLayout
            android:id="@+id/event_management_frame_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    </android.support.design.widget.CoordinatorLayout>
</layout>

}

操作如下：

 activityEventManagementBinding.eventManagementAppbar.addOnOffsetChangedListener(object : AppBarStateChangeListener() {
        override fun onStateChanged(appBarLayout: AppBarLayout, state: AppBarStateChangeListener.State) {
            if (state == State.COLLAPSED) {
                supportActionBar!!.setBackgroundDrawable(ContextCompat.getDrawable(this@EventManagementActivity, R.color.primary_color))
            } else {
                supportActionBar!!.setBackgroundDrawable(ContextCompat.getDrawable(this@EventManagementActivity, R.color.caldroid_transparent))
            }
        }
    })

---

从

工具栏

中删除属性

app:layout\u collapseMode=“pin”

。Hi@jeelvankhee删除了该属性并尝试过，但默认情况下工具栏仍然可见，滚动后隐藏。有什么我需要做的风格。理想的结果是，在开始时，工具栏应该是透明的，当在折叠工具栏上滚动布局时，工具栏应该以原色可见。Hi@JeelVankhede我正在实现AppBarLayout.OnOffsetChangedListener，并根据折叠或展开的状态操纵滚动来设置工具栏透明和原色。我想这只是一个帮助我的黑客，相信可能有一些更干净优雅的方式。

 activityEventManagementBinding.eventManagementAppbar.addOnOffsetChangedListener(object : AppBarStateChangeListener() {
        override fun onStateChanged(appBarLayout: AppBarLayout, state: AppBarStateChangeListener.State) {
            if (state == State.COLLAPSED) {
                supportActionBar!!.setBackgroundDrawable(ContextCompat.getDrawable(this@EventManagementActivity, R.color.primary_color))
            } else {
                supportActionBar!!.setBackgroundDrawable(ContextCompat.getDrawable(this@EventManagementActivity, R.color.caldroid_transparent))
            }
        }
    })