WattsAppPowerService2.kt

    private fun buildNotification(batteryStatus: Intent): Notification {
        val level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1)

        return NotificationCompat.Builder(this)
                .setContentTitle(getString(R.string.app_name))
                .setContentText("Phone is $level% charged.")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setOnlyAlertOnce(true)
                .build()
    }