优化

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

@@ -108,7 +108,8 @@
         android:text="@string/cancel"
         android:textColor="@color/secondaryText"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintRight_toLeftOf="@+id/tv_ok" />
+        app:layout_constraintRight_toLeftOf="@+id/tv_ok"
+        app:layout_constraintTop_toBottomOf="@+id/book_info" />
 
     <io.legado.app.ui.widget.text.AccentTextView
         android:id="@+id/tv_read"