优化

app/src/main/java/io/legado/app/App.kt

@@ -89,4 +89,8 @@ class App : MultiDexApplication() {
         }
     }
 
+    companion object {
+        var navigationBarHeight = 0
+    }
+
 }

app/src/main/java/io/legado/app/base/BaseActivity.kt

@@ -11,6 +11,7 @@ import android.view.View
 import android.widget.FrameLayout
 import androidx.appcompat.app.AppCompatActivity
 import androidx.viewbinding.ViewBinding
+import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.constant.AppConst
 import io.legado.app.constant.Theme
@@ -81,7 +82,7 @@ abstract class BaseActivity<VB : ViewBinding>(
     override fun onWindowFocusChanged(hasFocus: Boolean) {
         super.onWindowFocusChanged(hasFocus)
         if (hasFocus) {
-            AppConst.navigationBarHeight = navigationBarHeight
+            App.navigationBarHeight = navigationBarHeight
         }
     }
 

app/src/main/java/io/legado/app/constant/AppConst.kt

@@ -18,8 +18,6 @@ object AppConst {
 
     const val UA_NAME = "User-Agent"
 
-    var navigationBarHeight = 0
-
     val SCRIPT_ENGINE: ScriptEngine by lazy {
         ScriptEngineManager().getEngineByName("rhino")
     }

app/src/main/java/io/legado/app/ui/book/read/page/PageView.kt

@@ -7,9 +7,9 @@ import android.view.LayoutInflater
 import android.widget.FrameLayout
 import androidx.core.view.isGone
 import androidx.core.view.isInvisible
+import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.BaseActivity
-import io.legado.app.constant.AppConst
 import io.legado.app.constant.AppConst.timeFormat
 import io.legado.app.data.entities.Bookmark
 import io.legado.app.databinding.ViewBookPageBinding
@@ -85,7 +85,7 @@ 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 AppConst.navigationBarHeight
+                height = if (it.hideNavigationBar) 0 else App.navigationBarHeight
             }
         }
         contentTextView.upVisibleRect()