diff --git a/app/src/main/java/io/legado/app/base/BaseActivity.kt b/app/src/main/java/io/legado/app/base/BaseActivity.kt
index 78915a534..3f6873a44 100644
--- a/app/src/main/java/io/legado/app/base/BaseActivity.kt
+++ b/app/src/main/java/io/legado/app/base/BaseActivity.kt
@@ -28,6 +28,7 @@ abstract class BaseActivity<VM : ViewModel> : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(layoutID)
         onViewModelCreated(viewModel, savedInstanceState)
+        observeLiveBus()
     }
 
     abstract fun onViewModelCreated(viewModel: VM, savedInstanceState: Bundle?)
@@ -59,7 +60,7 @@ abstract class BaseActivity<VM : ViewModel> : AppCompatActivity() {
         return super.onOptionsItemSelected(item)
     }
 
-    protected fun initTheme() {
+    private fun initTheme() {
         window.decorView.setBackgroundColor(ThemeStore.backgroundColor(this))
         if (ColorUtils.isColorLight(ThemeStore.primaryColor(this))) {
             setTheme(R.style.AppTheme_Light)
@@ -68,7 +69,7 @@ abstract class BaseActivity<VM : ViewModel> : AppCompatActivity() {
         }
     }
 
-    protected fun setupSystemBar() {
+    private fun setupSystemBar() {
         window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS or WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION)
         window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
         window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
@@ -78,4 +79,8 @@ abstract class BaseActivity<VM : ViewModel> : AppCompatActivity() {
             window.statusBarColor = getCompatColor(R.color.status_bar_bag)
         }
     }
+
+    open fun observeLiveBus() {
+
+    }
 }
\ No newline at end of file
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 775523d59..7bd796f12 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
@@ -36,7 +36,6 @@ class MainActivity : BaseActivity<MainViewModel>(), BottomNavigationView.OnNavig
         view_pager_main.adapter = TabFragmentPageAdapter(supportFragmentManager)
         view_pager_main.addOnPageChangeListener(this)
         bottom_navigation_view.setOnNavigationItemSelectedListener(this)
-        observeLiveBus()
     }
 
     override fun onNavigationItemSelected(item: MenuItem): Boolean {
@@ -87,7 +86,7 @@ class MainActivity : BaseActivity<MainViewModel>(), BottomNavigationView.OnNavig
         }
     }
 
-    private fun observeLiveBus() {
+    override fun observeLiveBus() {
         LiveEventBus.get().with("recreate", String::class.java)
             .observe(this, Observer {
                 recreate()