diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/utils/BatteryHelper.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/utils/BatteryHelper.kt
index b42fb18..8b1120e 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/utils/BatteryHelper.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/utils/BatteryHelper.kt
@@ -16,7 +16,7 @@ object BatteryHelper {
     private var callbacks = mutableListOf<OnBatteryLevelCallback>()
     private var mLevel = -1;
     private var batteryManager: BatteryManager? = null
-//    private var charging = false;
+    private var mCharging = false;
 
     private val receiver = object : BroadcastReceiver() {
         override fun onReceive(context: Context?, intent: Intent?) {
@@ -26,6 +26,7 @@ object BatteryHelper {
                 val status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
                 val isCharging =
                     (status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL)
+                mCharging = isCharging
                 notifyUser(level)
                 mLevel = level
                 Log.i(
@@ -99,7 +100,7 @@ object BatteryHelper {
     fun addCallBack(callBack: OnBatteryLevelCallback) {
         callbacks.add(callBack)
         if (mLevel != -1) {
-            callBack.onLevel(mLevel, batteryManager?.isCharging == true)
+            callBack.onLevel(mLevel, mCharging)
         }
     }