diff --git a/app/src/main/java/io/legado/app/data/entities/rule/LogInRule.kt b/app/src/main/java/io/legado/app/data/entities/rule/LogInRule.kt
new file mode 100644
index 000000000..f8046237c
--- /dev/null
+++ b/app/src/main/java/io/legado/app/data/entities/rule/LogInRule.kt
@@ -0,0 +1,7 @@
+package io.legado.app.data.entities.rule
+
+data class LogInRule(
+    val ui: HashMap<String, String>,
+    val logInUrl: String,
+    val checkJs: String
+)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/PageView.kt b/app/src/main/java/io/legado/app/ui/book/read/page/PageView.kt
index 0d9c0c146..73fe4ca0c 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/page/PageView.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/page/PageView.kt
@@ -84,7 +84,9 @@ class PageView(context: Context) : FrameLayout(context) {
             vwTopDivider.visible(it.showHeaderLine)
             vwBottomDivider.visible(it.showFooterLine)
             pageNvBar.layoutParams = pageNvBar.layoutParams.apply {
-                height = if (it.hideNavigationBar) 0 else activity?.navigationBarHeight ?: 0
+                height =
+                    if (it.hideNavigationBar) 0
+                    else activity?.navigationBarHeight ?: 0
             }
         }
         contentTextView.upVisibleRect()
diff --git a/app/src/main/java/io/legado/app/utils/ActivityExtensions.kt b/app/src/main/java/io/legado/app/utils/ActivityExtensions.kt
index 842a95bbe..a1d9e02a4 100644
--- a/app/src/main/java/io/legado/app/utils/ActivityExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/ActivityExtensions.kt
@@ -3,6 +3,8 @@ package io.legado.app.utils
 import android.app.Activity
 import android.os.Build
 import android.util.DisplayMetrics
+import android.view.View
+import android.view.ViewGroup
 import android.view.WindowInsets
 import android.view.WindowMetrics
 
@@ -22,13 +24,39 @@ val Activity.windowSize: DisplayMetrics
         return displayMetrics
     }
 
+
+/**
+ * 返回NavigationBar是否存在
+ * 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
+ */
+val Activity.isNavigationBarExist: Boolean
+    get() {
+        val viewGroup = window.decorView as? ViewGroup
+        if (viewGroup != null) {
+            for (i in 0 until viewGroup.childCount) {
+                viewGroup.getChildAt(i).context.packageName
+                if (viewGroup.getChildAt(i).id != View.NO_ID
+                    && "navigationBarBackground" == resources.getResourceEntryName(
+                        viewGroup.getChildAt(
+                            i
+                        ).id
+                    )
+                ) {
+                    return true
+                }
+            }
+        }
+        return false
+    }
+
 /**
  * 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
  */
 val Activity.navigationBarHeight: Int
     get() {
-        if (SystemUtils.isNavigationBarExist(this)) {
+        if (isNavigationBarExist) {
             val resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android")
             return resources.getDimensionPixelSize(resourceId)
         }
diff --git a/app/src/main/java/io/legado/app/utils/SystemUtils.kt b/app/src/main/java/io/legado/app/utils/SystemUtils.kt
index 4625ebeb1..f1c135306 100644
--- a/app/src/main/java/io/legado/app/utils/SystemUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/SystemUtils.kt
@@ -8,15 +8,11 @@ import android.content.Intent
 import android.net.Uri
 import android.os.PowerManager
 import android.provider.Settings
-import android.view.View
-import android.view.ViewGroup
 
 
 @Suppress("unused")
 object SystemUtils {
 
-    private const val NAVIGATION = "navigationBarBackground"
-
     fun getScreenOffTime(context: Context): Int {
         var screenOffTime = 0
         kotlin.runCatching {
@@ -49,29 +45,4 @@ object SystemUtils {
         }
     }
 
-    /**
-     * 返回NavigationBar是否存在
-     * 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 viewGroup = it.window.decorView as? ViewGroup
-            if (viewGroup != null) {
-                for (i in 0 until viewGroup.childCount) {
-                    viewGroup.getChildAt(i).context.packageName
-                    if (viewGroup.getChildAt(i).id != View.NO_ID
-                        && NAVIGATION == activity.resources.getResourceEntryName(
-                            viewGroup.getChildAt(
-                                i
-                            ).id
-                        )
-                    ) {
-                        return true
-                    }
-                }
-            }
-        }
-        return false
-    }
 }