Android 可折叠工具栏未显示完全错误

今天我决定在我的应用程序中添加一个可折叠的工具栏。我遵循了一个指南（因为我对可折叠工具栏一无所知），它完全变了。一切都显示不正确。请原谅我对这些类型的布局缺乏经验。提前感谢你们这些优秀的美国人民

以下是我的布局：

<?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:id="@+id/list_coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/list_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="256dp"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/list_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|exitUntilCollapsed">

        <ImageView
            android:id="@+id/toolbar_image"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            android:scaleType="centerCrop"
            app:layout_collapseMode="parallax"
            tools:ignore="ContentDescription" />

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin" />

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/list_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="12dp">

    </android.support.v7.widget.RecyclerView>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/list_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:onClick="addItem"
        android:visibility="gone"
        app:fabSize="normal"
        app:layout_anchor="@+id/list_main"
        app:layout_anchorGravity="bottom|end" />

    <LinearLayout
        android:id="@+id/list_sheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

        <TextView
            android:id="@+id/list_sheet_share"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_share"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/share" />

        <TextView
            android:id="@+id/list_sheet_copy"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_content_copy"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/copy" />

        <TextView
            android:id="@+id/list_sheet_edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_mode_edit"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/edit_literal" />

        <TextView
            android:id="@+id/list_sheet_delete"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_delete"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/delete" />

    </LinearLayout>

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

好的，我想好了。这是因为我（愚蠢地）没有将appbar布局作为折叠工具栏的父级，而是它本身。正确的布局如下所示：

<?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:id="@+id/list_coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical"
    tools:context=".ui.ListCollapseActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/list_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="256dp"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/list_collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                android:id="@+id/toolbar_image"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"
                tools:ignore="ContentDescription" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="parallax" />

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

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/list_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="fill_vertical" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/list_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:onClick="addItem"
        android:visibility="gone"
        app:fabSize="normal"
        app:layout_anchor="@+id/list_main"
        app:layout_anchorGravity="bottom|end" />

    <LinearLayout
        android:id="@+id/list_sheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

        <TextView
            android:id="@+id/list_sheet_share"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_share"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/share" />

        <TextView
            android:id="@+id/list_sheet_copy"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_content_copy"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/copy" />

        <TextView
            android:id="@+id/list_sheet_edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_mode_edit"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/edit_literal" />

        <TextView
            android:id="@+id/list_sheet_delete"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_delete"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/delete" />

    </LinearLayout>

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

好的，我想出来了。这是因为我（愚蠢地）没有将appbar布局作为折叠工具栏的父级，而是它本身。正确的布局如下所示：

<?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:id="@+id/list_coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical"
    tools:context=".ui.ListCollapseActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/list_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="256dp"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/list_collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                android:id="@+id/toolbar_image"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"
                tools:ignore="ContentDescription" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="parallax" />

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

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/list_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="fill_vertical" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/list_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:onClick="addItem"
        android:visibility="gone"
        app:fabSize="normal"
        app:layout_anchor="@+id/list_main"
        app:layout_anchorGravity="bottom|end" />

    <LinearLayout
        android:id="@+id/list_sheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

        <TextView
            android:id="@+id/list_sheet_share"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_share"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/share" />

        <TextView
            android:id="@+id/list_sheet_copy"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_content_copy"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/copy" />

        <TextView
            android:id="@+id/list_sheet_edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_mode_edit"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/edit_literal" />

        <TextView
            android:id="@+id/list_sheet_delete"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:selectableItemBackground"
            android:drawablePadding="10dp"
            android:drawableStart="@drawable/ic_delete"
            android:gravity="center_vertical"
            android:padding="10dp"
            android:text="@string/delete" />

    </LinearLayout>

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