diff --git a/app/src/main/java/io/legado/app/App.kt b/app/src/main/java/io/legado/app/App.kt
index 019325cd0..6908c5715 100644
--- a/app/src/main/java/io/legado/app/App.kt
+++ b/app/src/main/java/io/legado/app/App.kt
@@ -10,9 +10,9 @@ import com.jeremyliao.liveeventbus.LiveEventBus
 import io.legado.app.constant.AppConst.channelIdDownload
 import io.legado.app.constant.AppConst.channelIdReadAloud
 import io.legado.app.constant.AppConst.channelIdWeb
-import io.legado.app.help.ActivityHelp
 import io.legado.app.help.AppConfig
 import io.legado.app.help.CrashHandler
+import io.legado.app.help.LifecycleHelp
 import io.legado.app.help.ThemeConfig.applyDayNight
 import io.legado.app.utils.LanguageUtils
 import io.legado.app.utils.defaultSharedPreferences
@@ -28,7 +28,7 @@ class App : MultiDexApplication() {
         LiveEventBus.config()
             .lifecycleObserverAlwaysActive(true)
             .autoClear(false)
-        registerActivityLifecycleCallbacks(ActivityHelp)
+        registerActivityLifecycleCallbacks(LifecycleHelp)
         defaultSharedPreferences.registerOnSharedPreferenceChangeListener(AppConfig)
     }
 
diff --git a/app/src/main/java/io/legado/app/help/ActivityHelp.kt b/app/src/main/java/io/legado/app/help/LifecycleHelp.kt
similarity index 67%
rename from app/src/main/java/io/legado/app/help/ActivityHelp.kt
rename to app/src/main/java/io/legado/app/help/LifecycleHelp.kt
index b5e1dbe28..bf03bd87c 100644
--- a/app/src/main/java/io/legado/app/help/ActivityHelp.kt
+++ b/app/src/main/java/io/legado/app/help/LifecycleHelp.kt
@@ -11,18 +11,18 @@ import java.util.*
  * Activity管理器,管理项目中Activity的状态
  */
 @Suppress("unused")
-object ActivityHelp : Application.ActivityLifecycleCallbacks {
+object LifecycleHelp : Application.ActivityLifecycleCallbacks {
 
     private val activities: MutableList<WeakReference<Activity>> = arrayListOf()
 
-    fun size(): Int {
+    fun activitySize(): Int {
         return activities.size
     }
 
     /**
      * 判断指定Activity是否存在
      */
-    fun isExist(activityClass: Class<*>): Boolean {
+    fun isExistActivity(activityClass: Class<*>): Boolean {
         activities.forEach { item ->
             if (item.get()?.javaClass == activityClass) {
                 return true
@@ -31,47 +31,6 @@ object ActivityHelp : Application.ActivityLifecycleCallbacks {
         return false
     }
 
-    /**
-     * 添加Activity
-     */
-    fun add(activity: Activity) {
-        activities.add(WeakReference(activity))
-    }
-
-    /**
-     * 移除Activity
-     */
-    fun remove(activity: Activity) {
-        for (temp in activities) {
-            if (null != temp.get() && temp.get() === activity) {
-                activities.remove(temp)
-                break
-            }
-        }
-    }
-
-    /**
-     * 移除Activity
-     */
-    fun remove(activityClass: Class<*>) {
-        val iterator = activities.iterator()
-        while (iterator.hasNext()) {
-            val item = iterator.next()
-            if (item.get()?.javaClass == activityClass) {
-                iterator.remove()
-            }
-        }
-    }
-
-    /**
-     * 关闭指定 activity
-     */
-    fun finishActivity(vararg activities: Activity) {
-        activities.forEach { activity ->
-            activity.finish()
-        }
-    }
-
     /**
      * 关闭指定 activity(class)
      */
@@ -101,7 +60,12 @@ object ActivityHelp : Application.ActivityLifecycleCallbacks {
     }
 
     override fun onActivityDestroyed(activity: Activity) {
-        remove(activity)
+        for (temp in activities) {
+            if (temp.get() === activity) {
+                activities.remove(temp)
+                break
+            }
+        }
     }
 
     override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {
@@ -111,7 +75,7 @@ object ActivityHelp : Application.ActivityLifecycleCallbacks {
     }
 
     override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
-        add(activity)
+        activities.add(WeakReference(activity))
         if (!LanguageUtils.isSameWithSetting(activity)){
             LanguageUtils.setConfiguration(activity)
         }
diff --git a/app/src/main/java/io/legado/app/receiver/MediaButtonReceiver.kt b/app/src/main/java/io/legado/app/receiver/MediaButtonReceiver.kt
index c25ebf2f1..d32e4934c 100644
--- a/app/src/main/java/io/legado/app/receiver/MediaButtonReceiver.kt
+++ b/app/src/main/java/io/legado/app/receiver/MediaButtonReceiver.kt
@@ -6,8 +6,8 @@ import android.content.Intent
 import android.view.KeyEvent
 import io.legado.app.constant.EventBus
 import io.legado.app.data.appDb
-import io.legado.app.help.ActivityHelp
 import io.legado.app.help.AppConfig
+import io.legado.app.help.LifecycleHelp
 import io.legado.app.service.AudioPlayService
 import io.legado.app.service.BaseReadAloudService
 import io.legado.app.service.help.AudioPlay
@@ -69,13 +69,13 @@ class MediaButtonReceiver : BroadcastReceiver() {
                 } else {
                     AudioPlay.pause(context)
                 }
-                ActivityHelp.isExist(ReadBookActivity::class.java) ->
+                LifecycleHelp.isExistActivity(ReadBookActivity::class.java) ->
                     postEvent(EventBus.MEDIA_BUTTON, true)
-                ActivityHelp.isExist(AudioPlayActivity::class.java) ->
+                LifecycleHelp.isExistActivity(AudioPlayActivity::class.java) ->
                     postEvent(EventBus.MEDIA_BUTTON, true)
                 else -> if (AppConfig.mediaButtonOnExit || !isMediaKey) {
                     appDb.bookDao.lastReadBook?.let {
-                        if (!ActivityHelp.isExist(MainActivity::class.java)) {
+                        if (!LifecycleHelp.isExistActivity(MainActivity::class.java)) {
                             Intent(context, MainActivity::class.java).let {
                                 it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                                 context.startActivity(it)