diff --git a/app/src/main/java/io/legado/app/receiver/TimeElectricityReceiver.kt b/app/src/main/java/io/legado/app/receiver/TimeBatteryReceiver.kt
similarity index 85%
rename from app/src/main/java/io/legado/app/receiver/TimeElectricityReceiver.kt
rename to app/src/main/java/io/legado/app/receiver/TimeBatteryReceiver.kt
index 765d05b3e..ce2e04fbe 100644
--- a/app/src/main/java/io/legado/app/receiver/TimeElectricityReceiver.kt
+++ b/app/src/main/java/io/legado/app/receiver/TimeBatteryReceiver.kt
@@ -9,12 +9,12 @@ import io.legado.app.constant.EventBus
 import io.legado.app.utils.postEvent
 
 
-class TimeElectricityReceiver : BroadcastReceiver() {
+class TimeBatteryReceiver : BroadcastReceiver() {
 
     companion object {
 
-        fun register(context: Context): TimeElectricityReceiver {
-            val receiver = TimeElectricityReceiver()
+        fun register(context: Context): TimeBatteryReceiver {
+            val receiver = TimeBatteryReceiver()
             val filter = IntentFilter()
             filter.addAction(Intent.ACTION_TIME_TICK)
             filter.addAction(Intent.ACTION_BATTERY_CHANGED)
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 11602b208..3ba0c965c 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -26,7 +26,7 @@ import io.legado.app.lib.dialogs.alert
 import io.legado.app.lib.dialogs.noButton
 import io.legado.app.lib.dialogs.okButton
 import io.legado.app.lib.theme.accentColor
-import io.legado.app.receiver.TimeElectricityReceiver
+import io.legado.app.receiver.TimeBatteryReceiver
 import io.legado.app.service.BaseReadAloudService
 import io.legado.app.service.help.ReadAloud
 import io.legado.app.service.help.ReadBook
@@ -81,7 +81,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
     private val keepScreenRunnable: Runnable = Runnable { Help.keepScreenOn(window, false) }
 
     private var screenTimeOut: Long = 0
-    private var timeElectricityReceiver: TimeElectricityReceiver? = null
+    private var timeBatteryReceiver: TimeBatteryReceiver? = null
     override val pageFactory: TextPageFactory get() = page_view.pageFactory
     override val headerHeight: Int get() = page_view.curPage.headerHeight
 
@@ -106,15 +106,15 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
     override fun onResume() {
         super.onResume()
         upSystemUiVisibility()
-        timeElectricityReceiver = TimeElectricityReceiver.register(this)
+        timeBatteryReceiver = TimeBatteryReceiver.register(this)
         page_view.upTime()
     }
 
     override fun onPause() {
         super.onPause()
-        timeElectricityReceiver?.let {
+        timeBatteryReceiver?.let {
             unregisterReceiver(it)
-            timeElectricityReceiver = null
+            timeBatteryReceiver = null
         }
         upSystemUiVisibility()
     }
@@ -719,7 +719,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
             Help.keepScreenOn(window, true)
             return
         }
-        val t = screenTimeOut - getScreenOffTime()
+        val t = screenTimeOut - sysScreenOffTime
         if (t > 0) {
             mHandler.removeCallbacks(keepScreenRunnable)
             Help.keepScreenOn(window, true)
diff --git a/app/src/main/java/io/legado/app/utils/ContextExtensions.kt b/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
index cb1eb6fe9..90415484a 100644
--- a/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/ContextExtensions.kt
@@ -1,3 +1,4 @@
+@file:Suppress("unused")
 package io.legado.app.utils
 
 import android.annotation.SuppressLint
@@ -68,26 +69,27 @@ fun Context.getCompatColorStateList(@ColorRes id: Int): ColorStateList? =
 /**
  * 系统息屏时间
  */
-fun Context.getScreenOffTime(): Int {
-    var screenOffTime = 0
-    try {
-        screenOffTime = Settings.System.getInt(contentResolver, Settings.System.SCREEN_OFF_TIMEOUT)
-    } catch (e: Exception) {
-        e.printStackTrace()
-    }
-    return screenOffTime
+val Context.sysScreenOffTime: Int
+    get() {
+        var screenOffTime = 0
+        try {
+            screenOffTime = Settings.System.getInt(contentResolver, Settings.System.SCREEN_OFF_TIMEOUT)
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        return screenOffTime
 }
 
 val Context.statusBarHeight: Int
     get() {
-    val resourceId = resources.getIdentifier("status_bar_height", "dimen", "android")
-    return resources.getDimensionPixelSize(resourceId)
+        val resourceId = resources.getIdentifier("status_bar_height", "dimen", "android")
+        return resources.getDimensionPixelSize(resourceId)
 }
 
 val Context.navigationBarHeight: Int
     get() {
-    val resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android")
-    return resources.getDimensionPixelSize(resourceId)
+        val resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android")
+        return resources.getDimensionPixelSize(resourceId)
 }
 
 fun Context.shareText(title: String, text: String) {
@@ -150,10 +152,11 @@ fun Context.sysIsDarkMode(): Boolean {
 /**
  * 获取电量
  */
-fun Context.getBettery(): Int {
-    val iFilter = IntentFilter(Intent.ACTION_BATTERY_CHANGED)
-    val batteryStatus = registerReceiver(null, iFilter)
-    return batteryStatus?.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) ?: -1
+val Context.sysBattery: Int
+    get() {
+        val iFilter = IntentFilter(Intent.ACTION_BATTERY_CHANGED)
+        val batteryStatus = registerReceiver(null, iFilter)
+        return batteryStatus?.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) ?: -1
 }
 
 fun Context.openUrl(url: String) {