diff --git a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
index 0dc5e2f18..d3f6c69a3 100644
--- a/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
+++ b/app/src/main/java/io/legado/app/help/ReadBookConfig.kt
@@ -17,31 +17,37 @@ import java.io.IOException
  * 阅读界面配置
  */
 object ReadBookConfig {
-    private val configList: ArrayList<Config> by lazy {
-        val list: ArrayList<Config> = arrayListOf()
-        val configFile = File(App.INSTANCE.filesDir.absolutePath + File.separator + "config")
+    const val fileName = "readConfig.json"
+    private val configList: ArrayList<Config> = arrayListOf<Config>()
+        .apply {
+            upConfig(this)
+        }
+
+    var styleSelect
+        get() = App.INSTANCE.getPrefInt("readStyleSelect")
+        set(value) = App.INSTANCE.putPrefInt("readStyleSelect", value)
+    var bg: Drawable? = null
+
+    fun getConfig(index: Int = styleSelect): Config {
+        return configList[index]
+    }
+
+    fun upConfig(list: ArrayList<Config> = configList) {
+        val configFile = File(App.INSTANCE.filesDir.absolutePath + File.separator + fileName)
         val json = if (configFile.exists()) {
             String(configFile.readBytes())
         } else {
-            String(App.INSTANCE.assets.open("readConfig.json").readBytes())
+            String(App.INSTANCE.assets.open(fileName).readBytes())
         }
         try {
             GSON.fromJsonArray<Config>(json)?.let {
+                list.clear()
                 list.addAll(it)
             }
         } catch (e: Exception) {
+            list.clear()
             list.addAll(getOnError())
         }
-        list
-    }
-
-    var styleSelect
-        get() = App.INSTANCE.getPrefInt("readStyleSelect")
-        set(value) = App.INSTANCE.putPrefInt("readStyleSelect", value)
-    var bg: Drawable? = null
-
-    fun getConfig(index: Int = styleSelect): Config {
-        return configList[index]
     }
 
     fun upBg() {
@@ -50,7 +56,7 @@ object ReadBookConfig {
 
     fun save() {
         val json = GSON.toJson(configList)
-        val configFile = File(App.INSTANCE.filesDir.absolutePath + File.separator + "config")
+        val configFile = File(App.INSTANCE.filesDir.absolutePath + File.separator + fileName)
         //获取流并存储
         try {
             BufferedWriter(FileWriter(configFile)).use { writer ->
@@ -64,7 +70,7 @@ object ReadBookConfig {
 
     fun reset() {
         try {
-            val json = String(App.INSTANCE.assets.open("readConfig.json").readBytes())
+            val json = String(App.INSTANCE.assets.open(fileName).readBytes())
             GSON.fromJsonArray<Config>(json)?.let {
                 configList.clear()
                 configList.addAll(it)
@@ -109,7 +115,10 @@ object ReadBookConfig {
             when (bgType) {
                 0 -> bgDrawable = ColorDrawable(Color.parseColor(bgStr))
                 1 -> bgDrawable =
-                    Drawable.createFromStream(App.INSTANCE.assets.open("bg" + File.separator + bgStr), "bg")
+                    Drawable.createFromStream(
+                        App.INSTANCE.assets.open("bg" + File.separator + bgStr),
+                        "bg"
+                    )
                 else -> runCatching {
                     bgDrawable = Drawable.createFromPath(bgStr)
                 }
diff --git a/app/src/main/java/io/legado/app/ui/readbook/Help.kt b/app/src/main/java/io/legado/app/ui/readbook/Help.kt
index 3f5a4cd2f..13bdebf50 100644
--- a/app/src/main/java/io/legado/app/ui/readbook/Help.kt
+++ b/app/src/main/java/io/legado/app/ui/readbook/Help.kt
@@ -1,12 +1,18 @@
 package io.legado.app.ui.readbook
 
+import android.app.Activity
 import android.view.View
+import android.view.View.NO_ID
+import android.view.ViewGroup
 import android.view.Window
 import io.legado.app.App
 import io.legado.app.utils.getPrefBoolean
 
+
 object Help {
 
+    private const val NAVIGATION = "navigationBarBackground"
+
     fun upSystemUiVisibility(window: Window, hide: Boolean = true) {
         var flag = (View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                 or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
@@ -28,4 +34,24 @@ object Help {
         window.decorView.systemUiVisibility = flag
     }
 
+    // 该方法需要在View完全被绘制出来之后调用，否则判断不了
+    //在比如 onWindowFocusChanged（）方法中可以得到正确的结果
+    fun isNavigationBarExist(activity: Activity?): Boolean {
+        activity?.let {
+            val vp = it.window.decorView as? ViewGroup
+            if (vp != null) {
+                for (i in 0 until vp.childCount) {
+                    vp.getChildAt(i).context.packageName
+                    if (vp.getChildAt(i).id != NO_ID && NAVIGATION == activity.resources.getResourceEntryName(
+                            vp.getChildAt(i).id
+                        )
+                    ) {
+                        return true
+                    }
+                }
+            }
+        }
+        return false
+    }
+
 }
\ No newline at end of file
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 7ed2418b2..81bdb2616 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
@@ -182,7 +182,11 @@ class ReadMenu : FrameLayout {
             override fun onAnimationEnd(animation: Animation) {
                 vw_menu_bg.onClick { runMenuOut() }
                 val lp = vwNavigationBar.layoutParams
-                lp.height = if (context.getPrefBoolean("hideNavigationBar"))
+                lp.height =
+                    if (context.getPrefBoolean("hideNavigationBar") and Help.isNavigationBarExist(
+                            activity
+                        )
+                    )
                     context.getNavigationBarHeight() else 0
                 vwNavigationBar.layoutParams = lp
             }
diff --git a/app/src/main/res/layout/dialog_read_book_style.xml b/app/src/main/res/layout/dialog_read_book_style.xml
index 83fc3f585..76b32aa5b 100644
--- a/app/src/main/res/layout/dialog_read_book_style.xml
+++ b/app/src/main/res/layout/dialog_read_book_style.xml
@@ -14,6 +14,22 @@
         android:background="@color/btn_bg_press"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <TextView
+        android:id="@+id/tv_anim"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:paddingStart="10dp"
+        android:paddingEnd="10dp"
+        android:text="@string/page_anim"
+        app:layout_constraintTop_toBottomOf="@+id/vw_bg_fg" />
+
+    <View
+        android:id="@+id/vw_bg_fg1"
+        android:layout_width="match_parent"
+        android:layout_height="0.8dp"
+        android:background="@color/btn_bg_press"
+        app:layout_constraintTop_toBottomOf="@+id/tv_anim" />
+
     <TextView
         android:id="@+id/tv_bg_ts"
         android:layout_width="match_parent"
@@ -21,7 +37,7 @@
         android:paddingStart="10dp"
         android:paddingEnd="10dp"
         android:text="@string/text_bg_style"
-        app:layout_constraintTop_toBottomOf="@+id/vw_bg_fg" />
+        app:layout_constraintTop_toBottomOf="@+id/vw_bg_fg1" />
 
     <io.legado.app.ui.widget.image.CircleImageView
         android:id="@+id/bg0"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 40b0ddca9..0444743b2 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -169,7 +169,7 @@
     <string name="volume_key_page">音量键翻页</string>
     <string name="click_open_page">点击翻页</string>
     <string name="click_all_next_page">点击总是翻下一页</string>
-    <string name="open_page_anim">翻页动画</string>
+    <string name="page_anim">翻页动画</string>
     <string name="keep_light">屏幕超时</string>
     <string name="back">返回</string>
     <string name="menu">菜单</string>