diff --git a/app/src/main/java/io/legado/app/constant/Bus.kt b/app/src/main/java/io/legado/app/constant/Bus.kt
new file mode 100644
index 000000000..1dd73ab1a
--- /dev/null
+++ b/app/src/main/java/io/legado/app/constant/Bus.kt
@@ -0,0 +1,5 @@
+package io.legado.app.constant
+
+object Bus {
+    val recreate = "recreate"
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
index c48b510f4..8efcaca17 100644
--- a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
@@ -9,6 +9,7 @@ import androidx.preference.PreferenceFragmentCompat
 import com.jeremyliao.liveeventbus.LiveEventBus
 import io.legado.app.App
 import io.legado.app.R
+import io.legado.app.constant.Bus
 import io.legado.app.lib.theme.ColorUtils
 import io.legado.app.utils.getCompatColor
 import io.legado.app.utils.getPrefBoolean
@@ -85,7 +86,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
     private fun upTheme(isNightTheme: Boolean) {
         if (App.INSTANCE.getPrefBoolean("isNightTheme", false) == isNightTheme) {
             App.INSTANCE.upThemeStore()
-            LiveEventBus.get().with("recreate").post("")
+            LiveEventBus.get().with(Bus.recreate).post("")
             Handler().postDelayed({activity?.recreate()}, 300)
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
index 7bd796f12..ae30e38c8 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
@@ -12,6 +12,7 @@ import com.google.android.material.bottomnavigation.BottomNavigationView
 import com.jeremyliao.liveeventbus.LiveEventBus
 import io.legado.app.R
 import io.legado.app.base.BaseActivity
+import io.legado.app.constant.Bus
 import io.legado.app.help.permission.Permissions
 import io.legado.app.help.permission.PermissionsCompat
 import io.legado.app.help.storage.Restore
@@ -87,7 +88,7 @@ class MainActivity : BaseActivity<MainViewModel>(), BottomNavigationView.OnNavig
     }
 
     override fun observeLiveBus() {
-        LiveEventBus.get().with("recreate", String::class.java)
+        LiveEventBus.get().with(Bus.recreate, String::class.java)
             .observe(this, Observer {
                 recreate()
             })