diff --git a/app/src/main/java/io/legado/app/ui/readbook/ReadMenu.kt b/app/src/main/java/io/legado/app/ui/readbook/ReadMenu.kt
index eb6d67b29..dccdce01e 100644
--- a/app/src/main/java/io/legado/app/ui/readbook/ReadMenu.kt
+++ b/app/src/main/java/io/legado/app/ui/readbook/ReadMenu.kt
@@ -199,13 +199,13 @@ class ReadMenu : FrameLayout {
 
             override fun onAnimationEnd(animation: Animation) {
                 vw_menu_bg.onClick { runMenuOut() }
-                val lp = vwNavigationBar.layoutParams
-                lp.height =
-                    if (context.getPrefBoolean("hideNavigationBar")
-                        && Help.isNavigationBarExist(activity)
-                    ) context.getNavigationBarHeight()
-                    else 0
-                vwNavigationBar.layoutParams = lp
+                vwNavigationBar.layoutParams = vwNavigationBar.layoutParams.apply {
+                    height =
+                        if (context.getPrefBoolean("hideNavigationBar")
+                            && Help.isNavigationBarExist(activity)
+                        ) context.getNavigationBarHeight()
+                        else 0
+                }
             }
 
             override fun onAnimationRepeat(animation: Animation) {