diff --git a/app/src/main/java/ch/dissem/apps/abit/ComposeMessageFragment.kt b/app/src/main/java/ch/dissem/apps/abit/ComposeMessageFragment.kt
index ff1b37b..bca4f5f 100644
--- a/app/src/main/java/ch/dissem/apps/abit/ComposeMessageFragment.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/ComposeMessageFragment.kt
@@ -35,7 +35,7 @@ import ch.dissem.apps.abit.ComposeMessageActivity.Companion.EXTRA_SUBJECT
 import ch.dissem.apps.abit.adapter.ContactAdapter
 import ch.dissem.apps.abit.dialog.SelectEncodingDialogFragment
 import ch.dissem.apps.abit.service.Singleton
-import ch.dissem.apps.abit.util.Preferences
+import ch.dissem.apps.abit.util.preferences
 import ch.dissem.bitmessage.entity.BitmessageAddress
 import ch.dissem.bitmessage.entity.Plaintext
 import ch.dissem.bitmessage.entity.Plaintext.Type.BROADCAST
@@ -94,8 +94,7 @@ class ComposeMessageFragment : Fragment() {
                 if (containsKey(EXTRA_CONTENT)) {
                     content = getString(EXTRA_CONTENT)
                 }
-                encoding = getSerializable(EXTRA_ENCODING) as? Plaintext.Encoding ?:
-                    Plaintext.Encoding.SIMPLE
+                encoding = getSerializable(EXTRA_ENCODING) as? Plaintext.Encoding ?: Plaintext.Encoding.SIMPLE
 
                 if (containsKey(EXTRA_PARENT)) {
                     val parent = getSerializable(EXTRA_PARENT) as Plaintext
@@ -221,7 +220,7 @@ class ComposeMessageFragment : Fragment() {
         }
         val sender = sender_input.selectedItem as? ch.dissem.bitmessage.entity.BitmessageAddress
         sender?.let { builder.from(it) }
-        if (!Preferences.requestAcknowledgements(ctx)) {
+        if (!ctx.preferences.requestAcknowledgements) {
             builder.preventAck()
         }
         when (encoding) {
diff --git a/app/src/main/java/ch/dissem/apps/abit/MainActivity.kt b/app/src/main/java/ch/dissem/apps/abit/MainActivity.kt
index 646579e..516e7bb 100644
--- a/app/src/main/java/ch/dissem/apps/abit/MainActivity.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/MainActivity.kt
@@ -31,10 +31,7 @@ import ch.dissem.apps.abit.listener.ListSelectionListener
 import ch.dissem.apps.abit.repository.AndroidLabelRepository.Companion.LABEL_ARCHIVE
 import ch.dissem.apps.abit.service.Singleton
 import ch.dissem.apps.abit.service.Singleton.currentLabel
-import ch.dissem.apps.abit.util.NetworkUtils
-import ch.dissem.apps.abit.util.Preferences
-import ch.dissem.apps.abit.util.getColor
-import ch.dissem.apps.abit.util.getIcon
+import ch.dissem.apps.abit.util.*
 import ch.dissem.bitmessage.BitmessageContext
 import ch.dissem.bitmessage.entity.BitmessageAddress
 import ch.dissem.bitmessage.entity.Conversation
@@ -253,11 +250,11 @@ class MainActivity : AppCompatActivity(), ListSelectionListener<Serializable> {
             .withIdentifier(ID_NODE_SWITCH)
             .withName(R.string.online)
             .withIcon(CommunityMaterial.Icon.cmd_cloud_outline)
-            .withChecked(Preferences.isOnline(this))
+            .withChecked(preferences.online)
             .withOnCheckedChangeListener { _, _, isChecked ->
-                Preferences.setOnline(this, isChecked)
+                preferences.online = isChecked
                 if (isChecked) {
-                    NetworkUtils.enableNode(this, true)
+                    network.enableNode(true)
                 }
             }
 
@@ -360,7 +357,7 @@ class MainActivity : AppCompatActivity(), ListSelectionListener<Serializable> {
     }
 
     override fun onResume() {
-        NetworkUtils.enableNode(this, false)
+        network.enableNode(false)
         updateUnread()
         Singleton.getMessageListener(this).resetNotification()
         currentLabel.addObserver(this) { label ->
diff --git a/app/src/main/java/ch/dissem/apps/abit/SettingsFragment.kt b/app/src/main/java/ch/dissem/apps/abit/SettingsFragment.kt
index 8c304dd..717a5cd 100644
--- a/app/src/main/java/ch/dissem/apps/abit/SettingsFragment.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/SettingsFragment.kt
@@ -17,7 +17,10 @@
 package ch.dissem.apps.abit
 
 import android.app.Activity
-import android.content.*
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.content.ServiceConnection
 import android.os.Bundle
 import android.os.IBinder
 import android.support.v4.app.Fragment
@@ -34,8 +37,8 @@ import ch.dissem.apps.abit.service.BatchProcessorService
 import ch.dissem.apps.abit.service.SimpleJob
 import ch.dissem.apps.abit.service.Singleton
 import ch.dissem.apps.abit.util.Exports
-import ch.dissem.apps.abit.util.NetworkUtils
-import ch.dissem.apps.abit.util.Preferences
+import ch.dissem.apps.abit.util.network
+import ch.dissem.apps.abit.util.preferences
 import ch.dissem.bitmessage.entity.Plaintext
 import com.mikepenz.aboutlibraries.Libs
 import com.mikepenz.aboutlibraries.LibsBuilder
@@ -99,7 +102,7 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceFragmentCompat.On
             val bmc = Singleton.getBitmessageContext(ctx)
             bmc.internals.nodeRegistry.clear()
             bmc.cleanup()
-            Preferences.cleanupExportDirectory(ctx)
+            ctx.preferences.cleanupExportDirectory()
 
             uiThread {
                 Toast.makeText(
@@ -118,7 +121,7 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceFragmentCompat.On
 
         indeterminateProgressDialog(R.string.export_data_summary, R.string.export_data).apply {
             doAsync {
-                val exportDirectory = Preferences.getExportDirectory(ctx)
+                val exportDirectory = ctx.preferences.exportDirectory
                 exportDirectory.mkdirs()
                 val file = Exports.exportData(exportDirectory, ctx)
                 val contentUri = getUriForFile(ctx, "ch.dissem.apps.abit.fileprovider", file)
@@ -157,7 +160,7 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceFragmentCompat.On
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         val ctx = context ?: throw IllegalStateException("No context available")
         when (requestCode) {
-            WRITE_EXPORT_REQUEST_CODE -> Preferences.cleanupExportDirectory(ctx)
+            WRITE_EXPORT_REQUEST_CODE -> ctx.preferences.cleanupExportDirectory()
             READ_IMPORT_REQUEST_CODE -> {
                 if (resultCode == Activity.RESULT_OK && data?.data != null) {
                     indeterminateProgressDialog(R.string.import_data_summary, R.string.import_data).apply {
@@ -228,7 +231,7 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceFragmentCompat.On
 
     private fun connectivityChangeListener() =
         OnPreferenceChangeListener { _, _ ->
-            context?.let { ctx -> NetworkUtils.scheduleNodeStart(ctx) }
+            context?.network?.scheduleNodeStart()
             true
         }
 
diff --git a/app/src/main/java/ch/dissem/apps/abit/dialog/FullNodeDialogActivity.kt b/app/src/main/java/ch/dissem/apps/abit/dialog/FullNodeDialogActivity.kt
index 985d6e4..9f86455 100644
--- a/app/src/main/java/ch/dissem/apps/abit/dialog/FullNodeDialogActivity.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/dialog/FullNodeDialogActivity.kt
@@ -19,8 +19,8 @@ package ch.dissem.apps.abit.dialog
 import android.app.Activity
 import android.os.Bundle
 import ch.dissem.apps.abit.R
-import ch.dissem.apps.abit.util.NetworkUtils
-import ch.dissem.apps.abit.util.Preferences
+import ch.dissem.apps.abit.util.network
+import ch.dissem.apps.abit.util.preferences
 import kotlinx.android.synthetic.main.dialog_full_node.*
 
 /**
@@ -31,12 +31,12 @@ class FullNodeDialogActivity : Activity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.dialog_full_node)
         ok.setOnClickListener {
-            Preferences.setWifiOnly(this@FullNodeDialogActivity, false)
-            NetworkUtils.enableNode(applicationContext)
+            preferences.wifiOnly = false
+            network.enableNode()
             finish()
         }
         dismiss.setOnClickListener {
-            NetworkUtils.scheduleNodeStart(applicationContext)
+            network.scheduleNodeStart()
             finish()
         }
     }
diff --git a/app/src/main/java/ch/dissem/apps/abit/listener/MessageListener.kt b/app/src/main/java/ch/dissem/apps/abit/listener/MessageListener.kt
index b4990a2..0ef4775 100644
--- a/app/src/main/java/ch/dissem/apps/abit/listener/MessageListener.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/listener/MessageListener.kt
@@ -19,7 +19,7 @@ package ch.dissem.apps.abit.listener
 import android.content.Context
 import ch.dissem.apps.abit.MainActivity
 import ch.dissem.apps.abit.notification.NewMessageNotification
-import ch.dissem.apps.abit.util.Preferences
+import ch.dissem.apps.abit.util.preferences
 import ch.dissem.bitmessage.BitmessageContext
 import ch.dissem.bitmessage.entity.Plaintext
 import ch.dissem.bitmessage.ports.MessageRepository
@@ -50,7 +50,7 @@ class MessageListener(ctx: Context) : BitmessageContext.Listener.WithContext {
     private lateinit var conversationService: ConversationService
 
     init {
-        emulateConversations = Preferences.isEmulateConversations(ctx)
+        emulateConversations = ctx.preferences.emulateConversations
     }
 
     override fun receive(plaintext: Plaintext) {
diff --git a/app/src/main/java/ch/dissem/apps/abit/service/BitmessageIntentService.kt b/app/src/main/java/ch/dissem/apps/abit/service/BitmessageIntentService.kt
index 7156ce9..46fcc94 100644
--- a/app/src/main/java/ch/dissem/apps/abit/service/BitmessageIntentService.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/service/BitmessageIntentService.kt
@@ -18,7 +18,7 @@ package ch.dissem.apps.abit.service
 
 import android.app.IntentService
 import android.content.Intent
-import ch.dissem.apps.abit.util.NetworkUtils
+import ch.dissem.apps.abit.util.network
 import ch.dissem.bitmessage.BitmessageContext
 import ch.dissem.bitmessage.entity.Plaintext
 
@@ -44,10 +44,10 @@ class BitmessageIntentService : IntentService("BitmessageIntentService") {
                 Singleton.getMessageListener(this).resetNotification()
             }
             if (it.hasExtra(EXTRA_STARTUP_NODE)) {
-                NetworkUtils.enableNode(this)
+                network.enableNode()
             }
             if (it.hasExtra(EXTRA_SHUTDOWN_NODE)) {
-                NetworkUtils.disableNode(this)
+                network.disableNode()
             }
         }
     }
diff --git a/app/src/main/java/ch/dissem/apps/abit/service/BitmessageService.kt b/app/src/main/java/ch/dissem/apps/abit/service/BitmessageService.kt
index e3b1345..0add64e 100644
--- a/app/src/main/java/ch/dissem/apps/abit/service/BitmessageService.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/service/BitmessageService.kt
@@ -23,10 +23,8 @@ import android.content.Intent
 import android.content.IntentFilter
 import android.net.ConnectivityManager
 import android.os.Handler
-import ch.dissem.apps.abit.R
-import ch.dissem.apps.abit.notification.ErrorNotification
 import ch.dissem.apps.abit.notification.NetworkNotification
-import ch.dissem.apps.abit.util.Preferences
+import ch.dissem.apps.abit.util.preferences
 import ch.dissem.bitmessage.BitmessageContext
 import ch.dissem.bitmessage.utils.Property
 import org.jetbrains.anko.doAsync
@@ -43,7 +41,7 @@ class BitmessageService : Service() {
 
     private val connectivityReceiver: BroadcastReceiver = object : BroadcastReceiver() {
         override fun onReceive(context: Context, intent: Intent?) {
-            if (bmc.isRunning() && !Preferences.isConnectionAllowed(this@BitmessageService)) {
+            if (bmc.isRunning() && !preferences.connectionAllowed) {
                 bmc.shutdown()
             }
         }
diff --git a/app/src/main/java/ch/dissem/apps/abit/service/NodeStartupService.kt b/app/src/main/java/ch/dissem/apps/abit/service/NodeStartupService.kt
index 3fb1512..97087fb 100644
--- a/app/src/main/java/ch/dissem/apps/abit/service/NodeStartupService.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/service/NodeStartupService.kt
@@ -2,8 +2,8 @@ package ch.dissem.apps.abit.service
 
 import android.app.job.JobParameters
 import android.app.job.JobService
-import ch.dissem.apps.abit.util.NetworkUtils
-import ch.dissem.apps.abit.util.Preferences
+import ch.dissem.apps.abit.util.network
+import ch.dissem.apps.abit.util.preferences
 
 /**
  * Starts the full node if
@@ -15,9 +15,8 @@ import ch.dissem.apps.abit.util.Preferences
 class NodeStartupService : JobService() {
 
     override fun onStartJob(params: JobParameters?): Boolean {
-        val bmc = Singleton.getBitmessageContext(this)
-        if (Preferences.isOnline(this) && !bmc.isRunning()) {
-            NetworkUtils.doStartBitmessageService(applicationContext)
+        if (preferences.online) {
+            network.scheduleNodeStart()
         }
         return true
     }
@@ -26,6 +25,9 @@ class NodeStartupService : JobService() {
      * Don't actually stop the service, otherwise it will be stopped after 1 or 10 minutes
      * depending on Android version.
      */
-    override fun onStopJob(params: JobParameters?) = false
+    override fun onStopJob(params: JobParameters?): Boolean {
+        network.scheduleNodeStart()
+        return false
+    }
 
 }
diff --git a/app/src/main/java/ch/dissem/apps/abit/service/StartServiceReceiver.kt b/app/src/main/java/ch/dissem/apps/abit/service/StartServiceReceiver.kt
index a811386..f5451ef 100644
--- a/app/src/main/java/ch/dissem/apps/abit/service/StartServiceReceiver.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/service/StartServiceReceiver.kt
@@ -4,16 +4,16 @@ import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.content.Intent.ACTION_BOOT_COMPLETED
-import ch.dissem.apps.abit.util.NetworkUtils
-import ch.dissem.apps.abit.util.Preferences
+import ch.dissem.apps.abit.util.network
+import ch.dissem.apps.abit.util.preferences
 
 /**
  * Starts the Bitmessage "full node" service if conditions allow it
  */
 class StartServiceReceiver : BroadcastReceiver() {
     override fun onReceive(context: Context, intent: Intent?) {
-        if (intent?.action == ACTION_BOOT_COMPLETED && Preferences.isOnline(context)) {
-            NetworkUtils.enableNode(context, false)
+        if (intent?.action == ACTION_BOOT_COMPLETED && context.preferences.online) {
+            context.network.enableNode(false)
         }
     }
 }
diff --git a/app/src/main/java/ch/dissem/apps/abit/util/NetworkUtils.kt b/app/src/main/java/ch/dissem/apps/abit/util/NetworkUtils.kt
index 67f4de4..9e0c81e 100644
--- a/app/src/main/java/ch/dissem/apps/abit/util/NetworkUtils.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/util/NetworkUtils.kt
@@ -10,14 +10,14 @@ import android.os.Build
 import ch.dissem.apps.abit.dialog.FullNodeDialogActivity
 import ch.dissem.apps.abit.service.BitmessageService
 import ch.dissem.apps.abit.service.NodeStartupService
+import java.lang.ref.WeakReference
 
+val Context.network get() = NetworkUtils.getInstance(this)
 
-object NetworkUtils {
+class NetworkUtils internal constructor(private val ctx: Context) {
 
-    fun enableNode(ctx: Context, ask: Boolean = true) {
-        if (Preferences.isConnectionAllowed(ctx) || !ask) {
-            scheduleNodeStart(ctx)
-        } else {
+    fun enableNode(ask: Boolean = true) {
+        if (ask && !ctx.preferences.connectionAllowed) {
             // Ask for connection
             val dialogIntent = Intent(ctx, FullNodeDialogActivity::class.java)
             if (ctx !is Activity) {
@@ -25,34 +25,42 @@ object NetworkUtils {
                 ctx.sendBroadcast(Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS))
             }
             ctx.startActivity(dialogIntent)
+        } else {
+            scheduleNodeStart()
         }
     }
 
-    fun doStartBitmessageService(ctx: Context) {
-        ctx.startService(Intent(ctx, BitmessageService::class.java))
-    }
-
-    fun disableNode(ctx: Context) {
+    fun disableNode() {
         ctx.stopService(Intent(ctx, BitmessageService::class.java))
     }
 
-    fun scheduleNodeStart(ctx: Context) {
+    fun scheduleNodeStart() {
         val jobScheduler = ctx.getSystemService(Context.JOB_SCHEDULER_SERVICE) as JobScheduler
         val serviceComponent = ComponentName(ctx, NodeStartupService::class.java)
         val builder = JobInfo.Builder(0, serviceComponent)
         when {
-            Preferences.isWifiOnly(ctx) ->
+            ctx.preferences.wifiOnly ->
                 builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_UNMETERED)
             Build.VERSION.SDK_INT >= Build.VERSION_CODES.N ->
                 builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_NOT_ROAMING)
             else ->
                 builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY)
         }
-        if (Preferences.requireCharging(ctx)) {
-            builder.setRequiresCharging(true)
-        }
-        builder.setPeriodic(15 * 60 * 1000L)
+        builder.setRequiresCharging(ctx.preferences.requireCharging)
         builder.setPersisted(true)
         jobScheduler.schedule(builder.build())
     }
+
+    companion object {
+        private var instance: WeakReference<NetworkUtils>? = null
+
+        internal fun getInstance(ctx: Context): NetworkUtils {
+            var networkUtils = instance?.get()
+            if (networkUtils == null) {
+                networkUtils = NetworkUtils(ctx.applicationContext)
+                instance = WeakReference(networkUtils)
+            }
+            return networkUtils
+        }
+    }
 }
diff --git a/app/src/main/java/ch/dissem/apps/abit/util/Preferences.kt b/app/src/main/java/ch/dissem/apps/abit/util/Preferences.kt
index 3067496..558a9ea 100644
--- a/app/src/main/java/ch/dissem/apps/abit/util/Preferences.kt
+++ b/app/src/main/java/ch/dissem/apps/abit/util/Preferences.kt
@@ -31,47 +31,49 @@ import org.jetbrains.anko.connectivityManager
 import org.jetbrains.anko.defaultSharedPreferences
 import org.slf4j.LoggerFactory
 import java.io.File
+import java.lang.ref.WeakReference
 
 
+val Context.preferences get() = Preferences.getInstance(this)
+
 /**
  * @author Christian Basler
  */
-object Preferences {
+class Preferences internal constructor(private val ctx: Context) {
     private val LOG = LoggerFactory.getLogger(Preferences::class.java)
 
-    fun isConnectionAllowed(ctx: Context) = isAllowedForWiFi(ctx) && isAllowedForCharging(ctx)
+    val connectionAllowed get() = isAllowedForWiFi && isAllowedForCharging
 
-    private fun isAllowedForWiFi(ctx: Context) = !isWifiOnly(ctx) || !ctx.connectivityManager.isActiveNetworkMetered
+    private val isAllowedForWiFi get() = !wifiOnly || !ctx.connectivityManager.isActiveNetworkMetered
 
-    private fun isAllowedForCharging(ctx: Context) = !requireCharging(ctx) || isCharging(ctx)
+    private val isAllowedForCharging get() = !requireCharging || isCharging
 
-    private fun isCharging(ctx: Context) = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-        ctx.batteryManager.isCharging
-    } else {
-        val intent = ctx.registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
-        val status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1)
-        status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL
-    }
+    private val isCharging
+        get() = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            ctx.batteryManager.isCharging
+        } else {
+            val intent = ctx.registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
+            val status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1)
+            status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL
+        }
 
-    fun isWifiOnly(ctx: Context) = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_WIFI_ONLY, true)
+    var wifiOnly
+        get() = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_WIFI_ONLY, true)
+        set(value) {
+            ctx.defaultSharedPreferences.edit()
+                .putBoolean(PREFERENCE_WIFI_ONLY, value)
+                .apply()
+        }
 
-    fun setWifiOnly(ctx: Context, status: Boolean) {
-        ctx.defaultSharedPreferences.edit()
-            .putBoolean(PREFERENCE_WIFI_ONLY, status)
-            .apply()
-    }
+    val requireCharging get() = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_REQUIRE_CHARGING, true)
 
-    fun requireCharging(ctx: Context) = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_REQUIRE_CHARGING, true)
+    val emulateConversations get() = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_EMULATE_CONVERSATIONS, true)
 
-    fun isEmulateConversations(ctx: Context) =
-        ctx.defaultSharedPreferences.getBoolean(PREFERENCE_EMULATE_CONVERSATIONS, true)
+    val exportDirectory by lazy { File(ctx.filesDir, "exports") }
 
-    fun getExportDirectory(ctx: Context) = File(ctx.filesDir, "exports")
+    val requestAcknowledgements = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_REQUEST_ACK, true)
 
-    fun requestAcknowledgements(ctx: Context) = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_REQUEST_ACK, true)
-
-    fun cleanupExportDirectory(ctx: Context) {
-        val exportDirectory = getExportDirectory(ctx)
+    fun cleanupExportDirectory() {
         if (exportDirectory.exists()) {
             exportDirectory.listFiles().forEach { file ->
                 try {
@@ -85,17 +87,29 @@ object Preferences {
         }
     }
 
-    fun isOnline(ctx: Context) = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_ONLINE, true)
+    var online
+        get() = ctx.defaultSharedPreferences.getBoolean(PREFERENCE_ONLINE, true)
+        set(value) {
+            ctx.defaultSharedPreferences.edit()
+                .putBoolean(PREFERENCE_ONLINE, value)
+                .apply()
+            if (value) {
+                ctx.network.enableNode(true)
+            } else {
+                ctx.network.disableNode()
+            }
+        }
 
-    fun setOnline(ctx: Context, status: Boolean) {
-        ctx.defaultSharedPreferences.edit()
-            .putBoolean(PREFERENCE_ONLINE, status)
-            .apply()
-        if (status) {
-            NetworkUtils.enableNode(ctx, true)
-        } else {
-            NetworkUtils.disableNode(ctx)
+    companion object {
+        private var instance: WeakReference<Preferences>? = null
+
+        internal fun getInstance(ctx: Context): Preferences {
+            var prefs = instance?.get()
+            if (prefs == null) {
+                prefs = Preferences(ctx.applicationContext)
+                instance = WeakReference(prefs)
+            }
+            return prefs
         }
     }
-
 }
diff --git a/build.gradle b/build.gradle
index bf3abe2..634522a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.2.50'
+    ext.kotlin_version = '1.2.51'
     ext.anko_version = '0.10.5'
     repositories {
         jcenter()