diff --git a/app/build.gradle b/app/build.gradle
index c84a4ec..e91a165 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
     defaultConfig {
         applicationId "nl.devluuk.sleepywifi"
-        minSdkVersion 23
-        targetSdkVersion 27
-        versionCode 8
-        versionName '1.7'
+        minSdkVersion 26
+        targetSdkVersion 28
+        versionCode 10
+        versionName '1.9'
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -16,20 +16,17 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
-    productFlavors {
-
-    }
 }
 
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
-    implementation 'com.android.support:support-v4:27.1.1'
+    implementation 'com.android.support:support-v4:28.0.0'
     implementation 'com.karumi:dexter:4.2.0'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
-    implementation 'com.android.support:preference-v7:27.1.1'
-    implementation 'com.android.support:design:27.1.1'
+    implementation 'com.android.support:preference-v7:28.0.0'
+    implementation 'com.android.support:design:28.0.0'
 }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 81a4ed3..b63bdc6 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -8,6 +8,7 @@
     <uses-permission android:name="android.permission.QUICKBOOT_POWERON"/>
     <uses-permission android:name="android.permission.BLUETOOTH"/>
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-feature android:name="android.hardware.bluetooth" android:required="false" />
 
     <application
diff --git a/app/src/main/java/nl/devluuk/sleepywifi/BackgroundService.java b/app/src/main/java/nl/devluuk/sleepywifi/BackgroundService.java
index 2a5b283..a098eff 100755
--- a/app/src/main/java/nl/devluuk/sleepywifi/BackgroundService.java
+++ b/app/src/main/java/nl/devluuk/sleepywifi/BackgroundService.java
@@ -7,21 +7,17 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.content.SharedPreferences;
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.IBinder;
-import android.preference.PreferenceManager;
 import android.support.v4.app.NotificationCompat;
-import android.util.Log;
 
 import java.lang.ref.WeakReference;
-import java.net.URL;
 import java.util.concurrent.TimeUnit;
 
 public class BackgroundService extends Service {
 
-    protected ScreenReceiver screenReciever;
+    protected ScreenReceiver screenReceiver;
 
     @Override
     public void onCreate() {
@@ -47,10 +43,10 @@ public void onCreate() {
 
 
         final IntentFilter filter = new IntentFilter();
-        this.screenReciever = new ScreenReceiver();
+        this.screenReceiver = new ScreenReceiver();
         filter.addAction(Intent.ACTION_SCREEN_OFF);
         filter.addAction(Intent.ACTION_SCREEN_ON);
-        registerReceiver(this.screenReciever, filter);
+        registerReceiver(this.screenReceiver, filter);
         new DismissNotification(this).execute();
     }
 
@@ -77,18 +73,15 @@ protected Void doInBackground(Void... params) {
 
     @Override
     public void onDestroy() {
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
-        if (screenReciever != null) {
-            unregisterReceiver(screenReciever);
-            screenReciever = null;
+        if (screenReceiver != null) {
+            unregisterReceiver(screenReceiver);
+            screenReceiver = null;
         }
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             stopForeground(true);
         } else {
             stopSelf();
         }
-        //setPreference(false);
-        //Log.i(TAG, "BackgroundService is off");
         super.onDestroy();
     }
 
diff --git a/app/src/main/java/nl/devluuk/sleepywifi/MainActivity.java b/app/src/main/java/nl/devluuk/sleepywifi/MainActivity.java
index b600822..a737224 100644
--- a/app/src/main/java/nl/devluuk/sleepywifi/MainActivity.java
+++ b/app/src/main/java/nl/devluuk/sleepywifi/MainActivity.java
@@ -1,7 +1,6 @@
 package nl.devluuk.sleepywifi;
 
 import android.app.Activity;
-import android.app.ActivityManager;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -10,6 +9,7 @@
 import android.graphics.ColorMatrix;
 import android.graphics.ColorMatrixColorFilter;
 import android.graphics.drawable.Drawable;
+import android.net.Uri;
 import android.os.Bundle;
 import android.os.PowerManager;
 import android.preference.PreferenceManager;
@@ -38,6 +38,7 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.activity_main);
 
         final ImageView imageButton = findViewById(R.id.powerButton);
+        powerManager = (PowerManager) this.getSystemService(Context.POWER_SERVICE);
         checkPrefOnStart(imageButton);
 
         imageButton.setOnClickListener(new View.OnClickListener() {
@@ -109,7 +110,7 @@ public void playOrPauseService(ImageView image) {
             setStateText(stateText, stateDesc);
 
         } else {
-            startService(new Intent(this, BackgroundService.class));
+            startForegroundService(new Intent(this, BackgroundService.class));
             setPreference(true);
 
             playIcon = getResources().getDrawable(R.drawable.ic_launcher_round, null);
@@ -122,9 +123,16 @@ public void playOrPauseService(ImageView image) {
 
     private void checkIgnoringBattery() {
         String packageName = this.getPackageName();
-        if (!powerManager.isIgnoringBatteryOptimizations(packageName)) {
-            showAlertDialog(this);
+        PowerManager pm = getSystemService(PowerManager.class);
+
+        if (!pm.isIgnoringBatteryOptimizations(packageName)) {
+            Intent i =
+                    new Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS)
+                            .setData(Uri.parse("package:" + packageName));
+
+            startActivity(i);
         }
+
     }
 
     public void checkPrefOnStart(ImageView image) {
@@ -133,11 +141,10 @@ public void checkPrefOnStart(ImageView image) {
 
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
         prefs.registerOnSharedPreferenceChangeListener(this);
-        powerManager = (PowerManager) this.getSystemService(Context.POWER_SERVICE);
 
         if (checkPrefStatus(getResources().getString(R.string.app_state))) {
             checkIgnoringBattery();
-            startService(new Intent(this, BackgroundService.class));
+            startForegroundService(new Intent(this, BackgroundService.class));
             playIcon = getResources().getDrawable(R.drawable.ic_launcher_round, null);
 
             image.setImageDrawable(playIcon);
@@ -153,16 +160,6 @@ public void checkPrefOnStart(ImageView image) {
 
     }
 
-    private boolean isMyServiceRunning(Class<?> serviceClass) {
-        ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
-        for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
-            if (serviceClass.getName().equals(service.service.getClassName())) {
-                return true;
-            }
-        }
-        return false;
-    }
-
     private void showAlertDialog(Context context) {
         final Intent batteryIntent = new Intent();
         AlertDialog.Builder batteryDialog = new AlertDialog.Builder(context);
@@ -191,10 +188,6 @@ public void onClick(DialogInterface dialog, int id) {
         alert.show();
     }
 
-    public boolean getBackgroundStatus() {
-        return status = isMyServiceRunning(BackgroundService.class);
-    }
-
     public boolean checkPrefStatus(String key) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
         return status = prefs.getBoolean(key, false);
diff --git a/app/src/main/java/nl/devluuk/sleepywifi/OnStart.java b/app/src/main/java/nl/devluuk/sleepywifi/OnStart.java
index 54d1c76..447f896 100644
--- a/app/src/main/java/nl/devluuk/sleepywifi/OnStart.java
+++ b/app/src/main/java/nl/devluuk/sleepywifi/OnStart.java
@@ -1,13 +1,9 @@
 package nl.devluuk.sleepywifi;
 
 import android.content.BroadcastReceiver;
-import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
-import android.content.pm.PackageManager;
 import android.os.Build;
-import android.support.v4.content.ContextCompat;
-import android.util.Log;
 
 public class OnStart extends BroadcastReceiver {
 
@@ -15,7 +11,7 @@ public class OnStart extends BroadcastReceiver {
     public void onReceive(Context context, Intent intent) {
         if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
             Intent i = new Intent(context, BackgroundService.class);
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                 context.startForegroundService(i);
             } else {
                 context.startService(i);
diff --git a/app/src/main/java/nl/devluuk/sleepywifi/ScreenReceiver.java b/app/src/main/java/nl/devluuk/sleepywifi/ScreenReceiver.java
index 521e95a..8a3dfa0 100755
--- a/app/src/main/java/nl/devluuk/sleepywifi/ScreenReceiver.java
+++ b/app/src/main/java/nl/devluuk/sleepywifi/ScreenReceiver.java
@@ -7,32 +7,23 @@
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.net.wifi.WifiManager;
-import android.os.AsyncTask;
 import android.preference.PreferenceManager;
-import android.util.Log;
-
-import java.lang.ref.WeakReference;
-import java.util.concurrent.TimeUnit;
 
 public class ScreenReceiver extends BroadcastReceiver {
 
-    private WifiManager wifiManager;
-    private BluetoothAdapter bluetoothAdapter;
+    WifiManager wifiManager;
     boolean wifiWasOn = false;
     boolean bluetoothWasOn = false;
     boolean bluetoothState;
-    int delayTime;
     boolean appState = false;
-    private static final String TAG = ScreenReceiver.class.getSimpleName();
 
     @Override
     public void onReceive(final Context context, final Intent intent) {
         wifiManager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
-        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         bluetoothState = prefs.getBoolean(context.getResources().getString(R.string.bluetooth_state), false);
         appState = prefs.getBoolean(context.getResources().getString(R.string.app_state), false);
-        delayTime = prefs.getInt(context.getResources().getString(R.string.key_power_off_time), 1);
 
         PackageManager pm = context.getPackageManager();
         final boolean deviceHasBluetooth = pm.hasSystemFeature(PackageManager.FEATURE_BLUETOOTH);
@@ -40,59 +31,33 @@ public void onReceive(final Context context, final Intent intent) {
         if (appState) {
             if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                 if (wifiManager.isWifiEnabled()) {
-                    //new Sleep(this).execute();
                     wifiManager.setWifiEnabled(false);
                     wifiWasOn = true;
                 } else {
                     wifiWasOn = false;
                 }
-                if (bluetoothState) {
-                    if (deviceHasBluetooth) {
-                        if (bluetoothAdapter.isEnabled()) {
-                            bluetoothAdapter.disable();
-                            bluetoothWasOn = true;
-                        } else {
-                            bluetoothWasOn = false;
-                        }
+                if (bluetoothState && deviceHasBluetooth) {
+                    if (bluetoothAdapter.isEnabled()) {
+                        bluetoothAdapter.disable();
+                        bluetoothWasOn = true;
+                    } else {
+                        bluetoothWasOn = false;
                     }
+
                 }
             } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                 if (wifiWasOn) {
                     wifiManager.setWifiEnabled(true);
                 }
-                if (bluetoothState) {
-                    if (deviceHasBluetooth) {
-                        if (bluetoothWasOn) {
-                            bluetoothAdapter.enable();
-                        }
+                if (bluetoothState && deviceHasBluetooth) {
+                    if (bluetoothWasOn) {
+                        bluetoothAdapter.enable();
                     }
                 }
             }
         }
     }
 
-    private class Sleep extends AsyncTask<Void, Void, Void> {
-
-        private WeakReference<ScreenReceiver> activityReference;
-
-        // only retain a weak reference to the activity
-        Sleep(ScreenReceiver context) {
-            activityReference = new WeakReference<>(context);
-        }
-
-        protected Void doInBackground(Void... params) {
-            try {
-                Log.v(TAG, "Sleeping.......");
-                TimeUnit.SECONDS.sleep(delayTime);
-                wifiManager.setWifiEnabled(false);
-                Log.v(TAG, "Wifi is offfff");
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
-            return null;
-        }
-    }
-
 }
 
 
diff --git a/app/src/main/java/nl/devluuk/sleepywifi/SettingsActivity.java b/app/src/main/java/nl/devluuk/sleepywifi/SettingsActivity.java
index e16b2c6..b658aed 100755
--- a/app/src/main/java/nl/devluuk/sleepywifi/SettingsActivity.java
+++ b/app/src/main/java/nl/devluuk/sleepywifi/SettingsActivity.java
@@ -1,9 +1,9 @@
 package nl.devluuk.sleepywifi;
 
 import android.app.ActionBar;
+import android.os.Bundle;
 import android.support.v4.app.NavUtils;
 import android.support.v7.app.AppCompatActivity;
-import android.os.Bundle;
 import android.view.MenuItem;
 
 public class SettingsActivity extends AppCompatActivity {
diff --git a/app/src/main/res/values-nl-rNL/strings.xml b/app/src/main/res/values-nl-rNL/strings.xml
index db787b9..fb0c6b4 100644
--- a/app/src/main/res/values-nl-rNL/strings.xml
+++ b/app/src/main/res/values-nl-rNL/strings.xml
@@ -18,13 +18,10 @@
     <string name="pref_header_general">Standaard</string>
     <string name="pref_description_enable_bluetooth">Zet Bluetooth uit in slaapmodus</string>
     <string name="pref_bluetooth_title">Zet Bluetooth slapen aan</string>
-    <string name="pref_keep_wifi_on">Hou de Wifi aan tijdens slaapmodus</string>
     <string name="app_state_desc1">Wifi staat</string>
     <string name="app_state_desc2">Wanneer de telefoon in slaapmodus is</string>
     <string name="no">Nee</string>
     <string name="yes">Ja</string>
     <string name="warning_battery_opt">Deze app werkt niet goed todat je deze app toestemming geeft om batterij optimalizatie te negeren</string>
     <string name="request_battery_opt">Verzoek negeer batterij-optimalisatie voor deze app</string>
-    <string name="pref_delay_power_off">Stel het uitgaan van de WiFi uit</string>
-    <string name="pref_delay_power_off_detail">Kies hoe lang het duurt voordat de wifi uit gaat</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0eb8063..67d2b0e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -23,13 +23,12 @@
     <string name="about_info">SleepyWifi Info</string>
     <string name="about_license">License</string>
     <string name="about_author">Author</string>
-    <string name="about_infoT">This Android app brings back the \'turn wifi off when the phone is in sleepmode\' option for Android 8.1 or newer.</string>
+    <string name="about_infoT">This Android app brings back the \'turn wifi off when the phone is in sleepmode\' option for Android 8.1 and Android 9.0.</string>
     <string name="about_licenseT">SleepyWifi is licensed under GPL-3.0 or later.</string>
     <string name="about_authorT">SleepyWifi is developed by <u>Devluuk</u></string>
     <string name="title_activity_settings">Settings</string>
 
     <!-- Strings related to Settings -->
-    <!-- Example General settings -->
     <string name="pref_header_general">General</string>
 
     <!--Bluetooth Key -->
@@ -38,36 +37,4 @@
     <string name="pref_bluetooth_title">Enable Bluetooth Sleeping</string>
     <string name="pref_description_enable_bluetooth">Turn Bluetooth off when the phone is in sleepmode
     </string>
-
-    <string name="pref_keep_wifi_on">Keep Wifi on during sleep</string>
-    <!-- Wifi Key -->
-    <string name="key_wifi_setting" translatable="false">wifi_state</string>
-    <!-- /Key -->
-    <string-array name="pref_list_titles" translatable="false">
-        <item>Always</item>
-        <item>Only when plugged in</item>
-        <item>Never</item>
-    </string-array>
-    <string-array name="pref_list_values" translatable="false">
-        <item>1</item>
-        <item>0</item>
-        <item>-1</item>
-    </string-array>
-    <!--Power off Key -->
-    <string name="key_power_off_time" translatable="false">power_off</string>
-    <!-- /Key -->
-    <string name="pref_delay_power_off">Delay Wifi turning off</string>
-    <string name="pref_delay_power_off_detail">Choose how long the delay is for turning off the wifi</string>
-    <string-array name="pref_power_off_time">
-        <item>1 second</item>
-        <item>5 seconds</item>
-        <item>20 seconds</item>
-        <item>60 seconds</item>
-    </string-array>
-    <string-array name="pref_power_off_values">
-        <item>1</item>
-        <item>5</item>
-        <item>20</item>
-        <item>60</item>
-    </string-array>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/xml/pref_visualizer.xml b/app/src/main/res/xml/pref_visualizer.xml
index d212559..39ca791 100644
--- a/app/src/main/res/xml/pref_visualizer.xml
+++ b/app/src/main/res/xml/pref_visualizer.xml
@@ -3,14 +3,6 @@
     <SwitchPreference
         android:defaultValue="false"
         android:key="@string/bluetooth_state"
-        android:title="@string/pref_bluetooth_title"
-        android:summary="@string/pref_description_enable_bluetooth"/>
-
-<!--    <ListPreference-->
-<!--        android:defaultValue="1"-->
-<!--        android:entries="@array/pref_power_off_time"-->
-<!--        android:entryValues="@array/pref_power_off_values"-->
-<!--        android:key="@string/key_power_off_time"-->
-<!--        android:summary="@string/pref_delay_power_off_detail"-->
-<!--        android:title="@string/pref_delay_power_off" />-->
+        android:summary="@string/pref_description_enable_bluetooth"
+        android:title="@string/pref_bluetooth_title" />
 </PreferenceScreen>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index fdfb867..a64add5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,14 +1,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    
+
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.2'
-        
+        classpath 'com.android.tools.build:gradle:3.5.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files