CoordinatorLayout

布局

<?xml version="1.0" encoding="utf-8"?>
<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=".Main2Activity">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:id="@+id/toolbar"
            android:layout_height="250dp"
            app:contentScrim="@color/colorAccent"
            app:collapsedTitleGravity="left"
            app:expandedTitleGravity="bottom|right"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="300dp"
                android:src="@mipmap/shuai"
                android:scaleType="centerCrop"></ImageView>

            <androidx.appcompat.widget.Toolbar
                android:layout_width="match_parent"
                android:layout_height="50dp"
                app:title="标题"></androidx.appcompat.widget.Toolbar>

        </com.google.android.material.appbar.CollapsingToolbarLayout>
    </com.google.android.material.appbar.AppBarLayout>

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

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <TextView
                android:layout_width="match_parent"
                android:layout_height="500dp"
                android:background="#03A9F4"></TextView>

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="300dp"
                android:src="@drawable/ic_launcher_background"></ImageView>
        </LinearLayout>
    </androidx.core.widget.NestedScrollView>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/shuai"
        app:layout_anchor="@id/toolbar"
        app:layout_anchorGravity="bottom|right"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"></com.google.android.material.floatingactionbutton.FloatingActionButton>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

效果