更新界面

app/src/main/res/layout/fragment_bookshelf3.xml

@@ -0,0 +1,45 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/title_bar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:fitsSystemWindows="true"
+        app:liftOnScroll="false"
+        android:stateListAnimator="@null">
+
+        <com.google.android.material.appbar.CollapsingToolbarLayout
+            android:id="@+id/coll_top_bar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/collapsingToolbarLayoutLargeSize"
+            style="?attr/collapsingToolbarLayoutLargeStyle"
+            app:collapsedTitleTextAppearance="?attr/textAppearanceTitleLarge"
+            app:expandedTitleTextAppearance="?attr/textAppearanceHeadlineLarge"
+            app:titleCollapseMode="scale"
+            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
+
+            <com.google.android.material.appbar.MaterialToolbar
+                android:id="@+id/top_bar"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:title="@string/bookshelf"
+                app:layout_collapseMode="pin" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <!-- ViewPager -->
+    <androidx.viewpager2.widget.ViewPager2
+        android:id="@+id/view_pager_bookshelf"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:paddingHorizontal="8dp"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>