From 309993eec6085cfa0e112cd5f45c8c55beeee5db Mon Sep 17 00:00:00 2001
From: Daniel Weipert <code@drogueronin.de>
Date: Mon, 15 May 2023 17:20:15 +0200
Subject: works as intended :)

---
 Readme.md                              |   4 +
 app/java/AndroidManifest.xml           |   7 +-
 app/java/res/layout/main.xml           |  16 +++-
 app/java/res/menu/settings.xml         |   3 +-
 app/java/res/values/strings.xml        |   4 +-
 app/java/res/xml/settings.xml          |  25 ++++--
 app/java/src/DNSProxyService.java      |  59 ++++++++++++--
 app/java/src/MainActivity.java         |  78 +++++++++---------
 app/java/src/SettingsActivity.java     | 118 +++++++++++++++++++++++++--
 app/java/src/WifiListenerReceiver.java |  23 ++++--
 app/java/src/WifiListenerService.java  | 145 +++++++++++++++++++++++++++++++--
 11 files changed, 404 insertions(+), 78 deletions(-)

diff --git a/Readme.md b/Readme.md
index 9e6fbd6..5e1064e 100644
--- a/Readme.md
+++ b/Readme.md
@@ -28,3 +28,7 @@
 - https://www.geeksforgeeks.org/how-to-implement-preferences-settings-screen-in-android/
 - https://google-developer-training.github.io/android-developer-fundamentals-course-practicals/en/Unit%204/92_p_adding_settings_to_an_app.html
 - https://github.com/google-developer-training/android-fundamentals/tree/master/DroidCafeWithSettings
+- https://stackoverflow.com/questions/5505472/android-anyone-know-the-filename-for-the-settings-icon/44862397#44862397
+
+### Location
+- https://stackoverflow.com/questions/25175522/how-to-enable-location-access-programmatically-in-android
diff --git a/app/java/AndroidManifest.xml b/app/java/AndroidManifest.xml
index e295ed4..8312571 100644
--- a/app/java/AndroidManifest.xml
+++ b/app/java/AndroidManifest.xml
@@ -8,7 +8,7 @@
 >
     <uses-sdk
         android:minSdkVersion="28"
-        android:targetSdkVersion="31"
+        android:targetSdkVersion="30"
     />
 
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
@@ -32,9 +32,8 @@
 
         <service
             android:name=".WifiListenerService"
-        >
-        </service>
-
+            android:foregroundServiceType="location"
+        ></service>
 
         <activity
             android:name=".MainActivity"
diff --git a/app/java/res/layout/main.xml b/app/java/res/layout/main.xml
index cc1780c..d3bbcf5 100644
--- a/app/java/res/layout/main.xml
+++ b/app/java/res/layout/main.xml
@@ -24,6 +24,20 @@
         android:id="@+id/button_start"
         android:layout_gravity="center"
         android:onClick="onClickButtonStart"
-        android:text="@string/button_start__start"
+        android:text="@string/button_start"
+        android:background="#22B225"
+        android:textColor="@android:color/white"
+        android:textSize="96sp"
+    />
+    <Button
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:id="@+id/button_stop"
+        android:layout_gravity="center"
+        android:onClick="onClickButtonStop"
+        android:text="@string/button_stop"
+        android:background="#96060C"
+        android:textColor="@android:color/white"
+        android:textSize="96sp"
     />
 </FrameLayout>
diff --git a/app/java/res/menu/settings.xml b/app/java/res/menu/settings.xml
index 2d86504..3af94ef 100644
--- a/app/java/res/menu/settings.xml
+++ b/app/java/res/menu/settings.xml
@@ -4,7 +4,8 @@
 >
     <item
         android:id="@+id/menu__settings"
+        android:icon="@android:drawable/ic_menu_preferences"
         android:title="@string/menu__settings"
-        android:orderInCategory="100"
+        android:showAsAction="always"
     />
 </menu>
diff --git a/app/java/res/values/strings.xml b/app/java/res/values/strings.xml
index bd4f88b..b34abae 100644
--- a/app/java/res/values/strings.xml
+++ b/app/java/res/values/strings.xml
@@ -11,10 +11,10 @@
         stopping
     </string>
 
-    <string name="button_start__start">
+    <string name="button_start">
         Start
     </string>
-    <string name="button_start__stop">
+    <string name="button_stop">
         Stop
     </string>
 
diff --git a/app/java/res/xml/settings.xml b/app/java/res/xml/settings.xml
index ea44ce0..0cd7034 100644
--- a/app/java/res/xml/settings.xml
+++ b/app/java/res/xml/settings.xml
@@ -9,14 +9,32 @@
         android:summary="Whether to use the automatic discovery mechanism to set the DNS server"
     />
 
+    <EditTextPreference
+        android:key="dns_server_address"
+        android:title="Pihole IP address"
+    />
+
     <SwitchPreference
         android:key="use_wifi_listener"
         android:defaultValue="false"
         android:title="Use WiFi listener"
-        android:summary="Automatically de/activates the proxy on WiFi dis/connect"
+        android:summary="Automatically deactivates the proxy on WiFi disconnect"
+    />
+
+    <SwitchPreference
+        android:key="use_wifi_listener_for_activation"
+        android:dependency="use_wifi_listener"
+        android:defaultValue="false"
+        android:title="Use WiFi listener for activation"
+        android:summary="Automatically activates the proxy on WiFi connect when connecting to specific WLAN. Needs location services to function!"
+    />
+
+    <EditTextPreference
+        android:key="wifi_listener_ssid"
+        android:dependency="use_wifi_listener_for_activation"
+        android:title="WLAN SSID"
     />
 
-    <!-- USE_WIFI_LISTENER -->
     <!-- SELECT_FROM_KNOWN_SSIDS -->
     <!-- <MultiSelectListPreference -->
     <!--     android:id="@+id/known_ssids" -->
@@ -24,7 +42,4 @@
     <!--     android:entries="" -->
     <!--     android:entryValues="" -->
     <!-- /> -->
-
-    <!-- USE_AUTOMATIC_DNS/PIHOLE_SERVER_DISCOVERY -->
-    <!-- SET_MANUAL_DNS/PIHOLE_SERVER_IP -->
 </PreferenceScreen>
diff --git a/app/java/src/DNSProxyService.java b/app/java/src/DNSProxyService.java
index 8911036..2b2147f 100644
--- a/app/java/src/DNSProxyService.java
+++ b/app/java/src/DNSProxyService.java
@@ -5,6 +5,7 @@ import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;
+import android.content.SharedPreferences;
 
 import android.content.Context;
 import android.content.Intent;
@@ -13,6 +14,8 @@ import android.net.DhcpInfo;
 import android.net.VpnService;
 import android.net.wifi.WifiManager;
 
+import android.preference.PreferenceManager;
+
 import android.util.Log;
 
 import java.net.InetAddress;
@@ -32,11 +35,11 @@ public class DNSProxyService extends VpnService {
     @Override
     public int onStartCommand(Intent intent, int flags, int startId)    {
         if (intent.getAction().equals(DNSProxyService.ACTION_START)) {
-            this.start();
+            this.connect();
 
             return Service.START_STICKY;
         } else {
-            this.stop();
+            this.disconnect();
 
             return Service.START_NOT_STICKY;
         }
@@ -44,7 +47,7 @@ public class DNSProxyService extends VpnService {
 
     @Override
     public void onDestroy() {
-        this.stop();
+        this.disconnect();
 
         super.onDestroy();
     }
@@ -58,7 +61,24 @@ public class DNSProxyService extends VpnService {
         return DNSProxyService.connection != null;
     }
 
-    public void start() {
+    /**
+     * Start this service
+     */
+    public static void start(Context context) {
+        context.startService((new Intent(context, DNSProxyService.class)).setAction(DNSProxyService.ACTION_START));
+    }
+
+    /**
+     * Stop this service
+     */
+    public static void stop(Context context) {
+        context.startService((new Intent(context, DNSProxyService.class)).setAction(DNSProxyService.ACTION_STOP));
+    }
+
+    /**
+     * Setup connection
+     */
+    private void connect() {
         this.setPiholeAddress();
 
         DNSProxyService.connection = new DNSProxyConnection(this);
@@ -71,7 +91,10 @@ public class DNSProxyService extends VpnService {
         sendBroadcast(notification);
     }
 
-    public void stop() {
+    /**
+     * Disconnect from connection
+     */
+    private void disconnect() {
         DNSProxyService.connection.stop();
         DNSProxyService.connection = null;
 
@@ -82,7 +105,16 @@ public class DNSProxyService extends VpnService {
         sendBroadcast(notification);
     }
 
+    /**
+     * Get and set IP address of Pihole DNS server
+     */
     private void setPiholeAddress() {
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
+        if (!sharedPreferences.getBoolean("use_automatic_dns_server_discovery", true)) {
+            DNSProxyService.PIHOLE_ADDRESS = sharedPreferences.getString("dns_server_address", "");
+            return;
+        }
+
         WifiManager manager = (WifiManager) getSystemService(WIFI_SERVICE);
         DhcpInfo info = manager.getDhcpInfo();
 
@@ -100,11 +132,16 @@ public class DNSProxyService extends VpnService {
         }
     }
 
+    /**
+     * Start the Foreground notification process
+     */
     private void startForeground() {
         NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
 
         NotificationChannel channel = new NotificationChannel(
-            DNSProxyService.NOTIFICATION_CHANNEL_ID, DNSProxyService.NOTIFICATION_CHANNEL_ID, NotificationManager.IMPORTANCE_DEFAULT
+            DNSProxyService.NOTIFICATION_CHANNEL_ID,
+            DNSProxyService.NOTIFICATION_CHANNEL_ID,
+            NotificationManager.IMPORTANCE_DEFAULT
         );
         manager.createNotificationChannel(channel);
 
@@ -112,7 +149,15 @@ public class DNSProxyService extends VpnService {
             .setSmallIcon(R.drawable.logo)
             .setContentTitle("Pihole DNS Proxy")
             .setContentText("Running with " + DNSProxyService.PIHOLE_ADDRESS)
-            // .setContentIntent(PendingIntent.getActivity(this, 0, new Intent(MainActivity.class), PendingIntent.FLAG_IMMUTABLE))
+            .setContentIntent(PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), Intent.FLAG_ACTIVITY_NEW_TASK))
+            .addAction(
+                R.drawable.logo,
+                "Stop",
+                PendingIntent.getService(this, 0,
+                    (new Intent(this, DNSProxyService.class)).setAction(DNSProxyService.ACTION_STOP),
+                    PendingIntent.FLAG_IMMUTABLE
+                )
+            )
             .build();
 
         startForeground(1, notification);
diff --git a/app/java/src/MainActivity.java b/app/java/src/MainActivity.java
index 6d232b9..f30f91c 100644
--- a/app/java/src/MainActivity.java
+++ b/app/java/src/MainActivity.java
@@ -33,7 +33,7 @@ import android.provider.Settings;
 public class MainActivity extends Activity {
 
     private Button buttonStart;
-    private Intent dnsProxyService;
+    private Button buttonStop;
 
     private BroadcastReceiver receiveDNSProxyService = new BroadcastReceiver() {
 
@@ -42,7 +42,7 @@ public class MainActivity extends Activity {
          */
         @Override
         public void onReceive(Context context, Intent intent) {
-            setStateButtonStart();
+            setStateButtonStartStop();
         }
     };
 
@@ -53,7 +53,7 @@ public class MainActivity extends Activity {
          */
         @Override
         public void onReceive(Context context, Intent intent) {
-            setStateButtonStart();
+            setStateButtonStartStop();
         }
     };
 
@@ -64,17 +64,19 @@ public class MainActivity extends Activity {
         setContentView(R.layout.main);
 
         this.buttonStart = (Button) findViewById(R.id.button_start);
-        this.dnsProxyService = new Intent(this, DNSProxyService.class);
+        this.buttonStop = (Button) findViewById(R.id.button_stop);
     }
 
     @Override
     public void onResume() {
         super.onResume();
 
-        this.setStateButtonStart();
-        this.toggleWifiListenerService();
+        this.setStateButtonStartStop();
         registerReceiver(this.receiveDNSProxyService, new IntentFilter(DNSProxyService.NOTIFICATION));
         registerReceiver(this.receiveNetworkChange, new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION));
+
+        WifiListenerService.toggle(this);
+        WifiListenerService.OnActivationListener.askLocationIfNeeded(this);
     }
 
     @Override
@@ -98,8 +100,7 @@ public class MainActivity extends Activity {
         int itemId = item.getItemId();
 
         if (itemId == R.id.menu__settings) {
-            Intent intent = new Intent(MainActivity.this, SettingsActivity.class);
-            startActivity(intent);
+            startActivity(new Intent(this, SettingsActivity.class));
 
             return true;
         }
@@ -121,46 +122,57 @@ public class MainActivity extends Activity {
      * button_start is clicked
      */
     public void onClickButtonStart(View view) {
-        if (!DNSProxyService.isRunning()) { //start
-            Intent intent = VpnService.prepare(this);
-
-            if (intent != null) {
-                startActivityForResult(intent, 0);
-            } else {
-                this.onActivityResult(0, RESULT_OK, null);
-            }
-        }
-        else { // stop
-            this.stopDNSProxyService();
+        this.prepareVpnService();
+    }
+
+    /**
+     * button_stop is clicked
+     */
+    public void onClickButtonStop(View view) {
+        this.stopDNSProxyService();
+    }
+
+    /**
+     * prepare VpnService properly
+     * and ask for confirmation
+     */
+    private void prepareVpnService() {
+        Intent intent = VpnService.prepare(this);
+
+        if (intent != null) {
+            startActivityForResult(intent, 0);
+        } else {
+            this.onActivityResult(0, RESULT_OK, null);
         }
     }
 
     /**
      * Set button_start state
      */
-    private void setStateButtonStart() {
-        // change text
+    private void setStateButtonStartStop() {
         if (!DNSProxyService.isRunning()) {
-            this.buttonStart.setText(getString(R.string.button_start__start));
+            this.buttonStart.setVisibility(View.VISIBLE);
+            this.buttonStop.setVisibility(View.GONE);
         } else {
-            this.buttonStart.setText(getString(R.string.button_start__stop));
+            this.buttonStart.setVisibility(View.GONE);
+            this.buttonStop.setVisibility(View.VISIBLE);
         }
 
-        // toggle enabled
-        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
+        // toggle whether enabled
+        /* ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
         if (networkInfo.isConnected() || DNSProxyService.isRunning()) {
             this.buttonStart.setEnabled(true);
         } else if (!networkInfo.isConnected() && !DNSProxyService.isRunning()) {
             this.buttonStart.setEnabled(false);
-        }
+        } */
     }
 
     /**
      * Start DNSProxyService
      */
     private void startDNSProxyService() {
-        startService(this.dnsProxyService.setAction(DNSProxyService.ACTION_START));
+        DNSProxyService.start(this);
 
         Toast
             .makeText(
@@ -175,7 +187,7 @@ public class MainActivity extends Activity {
      * Stop DNSProxyService
      */
     private void stopDNSProxyService() {
-        startService(this.dnsProxyService.setAction(DNSProxyService.ACTION_STOP));
+        DNSProxyService.stop(this);
 
         Toast
             .makeText(
@@ -185,14 +197,4 @@ public class MainActivity extends Activity {
             )
             .show();
     }
-
-    private void toggleWifiListenerService() {
-        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
-
-        if (sharedPreferences.getBoolean("use_wifi_listener", false)) {
-            startService(new Intent(this, WifiListenerService.class));
-        } else {
-            stopService(new Intent(this, WifiListenerService.class));
-        }
-    }
 }
diff --git a/app/java/src/SettingsActivity.java b/app/java/src/SettingsActivity.java
index c71693a..d04e2ba 100644
--- a/app/java/src/SettingsActivity.java
+++ b/app/java/src/SettingsActivity.java
@@ -7,8 +7,12 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 
 import android.net.VpnService;
+import android.net.wifi.WifiManager;
+import android.net.wifi.WifiInfo;
 
 import android.os.Bundle;
 
@@ -39,15 +43,9 @@ public class SettingsActivity extends PreferenceActivity {
         super.onCreate(savedInstanceState);
 
         getFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();
-
-        // if (setting.get(USE_WIFI_LISTENER))
-        // requestPermissions(new String[]{
-        //     android.Manifest.permission.ACCESS_FINE_LOCATION,
-        // }, 1234);
-        // startService(WifiListenerService);
     }
 
-    public static class SettingsFragment extends PreferenceFragment {
+    public static class SettingsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener {
 
         @Override
         public void onCreate(Bundle savedInstanceState) {
@@ -55,5 +53,111 @@ public class SettingsActivity extends PreferenceActivity {
 
             addPreferencesFromResource(R.xml.settings);
         }
+
+        @Override
+        public void onResume() {
+            super.onResume();
+
+            getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
+
+            DNSServerAddress.toggleEnabled(this);
+            DNSServerAddress.displayValue(this);
+            WifiListener.SSID.displayValue(this);
+        }
+
+        @Override
+        public void onPause() {
+            super.onPause();
+
+            getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
+        }
+
+        @Override
+        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+            if (key.equals("use_automatic_dns_server_discovery")) {
+                DNSServerAddress.toggleEnabled(this);
+            }
+
+            else if (key.equals("dns_server_address")) {
+                DNSServerAddress.displayValue(this);
+            }
+
+            else if (key.equals("use_wifi_listener")) {
+                WifiListener.toggle(this);
+            }
+
+            else if (key.equals("use_wifi_listener_for_activation")) {
+                if (sharedPreferences.getBoolean("use_wifi_listener_for_activation", false)) {
+                    WifiListener.Activation.enable(this);
+                }
+            }
+
+            else if (key.equals("wifi_listener_ssid")) {
+                WifiListener.SSID.displayValue(this);
+            }
+        }
+
+        static class DNSServerAddress {
+            public static void toggleEnabled(PreferenceFragment context) {
+                context.findPreference("dns_server_address").setEnabled(
+                    !context.getPreferenceScreen().getSharedPreferences().getBoolean("use_automatic_dns_server_discovery", true)
+                );
+            }
+
+            public static void displayValue(PreferenceFragment context) {
+                context.findPreference("dns_server_address").setSummary(
+                    context.getPreferenceScreen().getSharedPreferences().getString("dns_server_address", "")
+                );
+            }
+        }
+
+        static class WifiListener {
+            public static void toggle(PreferenceFragment context) {
+                SharedPreferences sharedPreferences = context.getPreferenceScreen().getSharedPreferences();
+
+                if (sharedPreferences.getBoolean("use_wifi_listener", false)) {
+                    WifiListenerService.start(context.getActivity());
+                } else {
+                    disable(context);
+                }
+            }
+
+            public static void disable(PreferenceFragment context) {
+                SharedPreferences sharedPreferences = context.getPreferenceScreen().getSharedPreferences();
+
+                WifiListenerService.disable(context.getActivity());
+            }
+
+            static class Activation {
+                public static void enable(PreferenceFragment context) {
+                    SharedPreferences sharedPreferences = context.getPreferenceScreen().getSharedPreferences();
+
+                    WifiListenerService.OnActivationListener.askLocationIfNeeded(context.getActivity());
+
+                    if (sharedPreferences.getString("wifi_listener_ssid", "").equals("")) {
+                        WifiManager wifiManager = (WifiManager) context.getActivity().getSystemService(Context.WIFI_SERVICE);
+                        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
+                        String ssid = wifiInfo.getSSID();
+
+                        // remove quotes around ssid
+                        ssid = ssid.substring(1, ssid.length() - 1);
+
+                        if (!ssid.equals("unknown ssid")) {
+                            SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();
+                            sharedPreferencesEditor.putString("wifi_listener_ssid", ssid);
+                            sharedPreferencesEditor.commit();
+                        }
+                    }
+                }
+            }
+
+            static class SSID {
+                public static void displayValue(PreferenceFragment context) {
+                    context.findPreference("wifi_listener_ssid").setSummary(
+                        context.getPreferenceScreen().getSharedPreferences().getString("wifi_listener_ssid", "")
+                    );
+                }
+            }
+        }
     }
 }
diff --git a/app/java/src/WifiListenerReceiver.java b/app/java/src/WifiListenerReceiver.java
index d34df2b..6bf93bd 100644
--- a/app/java/src/WifiListenerReceiver.java
+++ b/app/java/src/WifiListenerReceiver.java
@@ -5,6 +5,7 @@ import android.provider.Settings;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.SharedPreferences;
 
 import android.net.NetworkInfo;
 import android.net.wifi.WifiManager;
@@ -13,6 +14,8 @@ import android.net.wifi.WifiInfo;
 import android.os.Bundle;
 import android.os.Handler;
 
+import android.preference.PreferenceManager;
+
 import android.util.Log;
 
 public class WifiListenerReceiver extends BroadcastReceiver
@@ -24,23 +27,33 @@ public class WifiListenerReceiver extends BroadcastReceiver
 
         // start
         if (networkInfo.getState().equals(NetworkInfo.State.CONNECTED)) {
+            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
+
+            if (!sharedPreferences.getBoolean("use_wifi_listener_for_activation", false)) {
+                return;
+            }
+
             // wait a few moments for wifi to be fully there
-            /* (new Handler()).postDelayed(new Runnable() {
+            (new Handler()).postDelayed(new Runnable() {
                 @Override
                 public void run() {
                     WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
                     WifiInfo wifiInfo = wifiManager.getConnectionInfo();
+                    String ssid = wifiInfo.getSSID();
 
-                    // if (wifiInfo.getSSID() == setting.get(LOCAL_HOME_WIFI_SSID))
+                    // remove quotes around ssid
+                    ssid = ssid.substring(1, ssid.length() - 1);
 
-                    context.startService(dnsProxyService.setAction(DNSProxyService.ACTION_START));
+                    if (ssid.equals(sharedPreferences.getString("wifi_listener_ssid", ""))) {
+                        DNSProxyService.start(context);
+                    }
                 }
-            }, 1000); */
+            }, 1000);
         }
 
         // stop
         else if (networkInfo.getState().equals(NetworkInfo.State.DISCONNECTED) && DNSProxyService.isRunning()) {
-            context.startService(dnsProxyService.setAction(DNSProxyService.ACTION_STOP));
+            DNSProxyService.stop(context);
         }
     }
 }
diff --git a/app/java/src/WifiListenerService.java b/app/java/src/WifiListenerService.java
index e25c325..1bf89eb 100644
--- a/app/java/src/WifiListenerService.java
+++ b/app/java/src/WifiListenerService.java
@@ -1,27 +1,37 @@
 package org.pihole.dnsproxy;
 
+import android.app.Activity;
 import android.app.Notification;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;
+import android.content.SharedPreferences;
 
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 
+import android.location.LocationManager;
+
 import android.net.ConnectivityManager;
 import android.net.wifi.WifiManager;
 
 import android.os.IBinder;
 
+import android.preference.PreferenceFragment;
+import android.preference.PreferenceManager;
+
 import android.util.Log;
 
 public class WifiListenerService extends Service
 {
 
     public static String NOTIFICATION_CHANNEL_ID = "org.pihole.dnsproxy.service.wifiListener";
+    public static String ACTION_START = "org.pihole.dnsproxy.service.wifiListener.START";
+    public static String ACTION_STOP = "org.pihole.dnsproxy.service.wifiListener.STOP";
+    public static String ACTION_STOP_SET_PREFERENCE = "org.pihole.dnsproxy.service.wifiListener.STOP_SET_PREFERENCE";
 
     private BroadcastReceiver receiver;
 
@@ -34,14 +44,28 @@ public class WifiListenerService extends Service
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
-        this.start();
+        if (intent.getAction().equals(WifiListenerService.ACTION_START)) {
+            this.listen();
+
+            return Service.START_STICKY;
+        } else if (intent.getAction().equals(WifiListenerService.ACTION_STOP)) {
+            try {
+                this.deafen();
+            } catch (Exception exception) {}
+
+            return Service.START_NOT_STICKY;
+        } else if (intent.getAction().equals(WifiListenerService.ACTION_STOP_SET_PREFERENCE)) {
+            WifiListenerService.disable(this);
+
+            return Service.START_NOT_STICKY;
+        }
 
-        return START_STICKY;
+        return Service.START_NOT_STICKY;
     }
 
     @Override
     public void onDestroy() {
-        this.stop();
+        this.deafen();
 
         super.onDestroy();
     }
@@ -49,10 +73,66 @@ public class WifiListenerService extends Service
     @Override
     public IBinder onBind(Intent intent) { return null; }
 
-    public void start() {
-        // registerReceiver(this.receiver, new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION));
+    /**
+     * start this service
+     */
+    public static void start(Context context) {
+        context.startService((new Intent(context, WifiListenerService.class)).setAction(WifiListenerService.ACTION_START));
+    }
+
+    /**
+     * stop this service
+     */
+    public static void stop(Context context) {
+        context.startService((new Intent(context, WifiListenerService.class)).setAction(WifiListenerService.ACTION_STOP));
+    }
+
+    public static void toggle(Context context) {
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
+
+        if (sharedPreferences.getBoolean("use_wifi_listener", false)) {
+            WifiListenerService.start(context);
+        } else {
+            WifiListenerService.stop(context);
+        }
+    }
+
+    /**
+     * Stop Wifi Listener and disable completely
+     */
+    public static void disable(Context context) {
+        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
+        SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();
+
+        WifiListenerService.stop(context);
+        sharedPreferencesEditor.putBoolean("use_wifi_listener", false);
+        sharedPreferencesEditor.commit();
+
+        WifiListenerService.OnActivationListener.disable(context);
+    }
+
+    /**
+     * setup listener
+     */
+    private void listen() {
         registerReceiver(this.receiver, new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION));
 
+        this.startForeground();
+    }
+
+    /**
+     * stop listening
+     */
+    private void deafen() {
+        unregisterReceiver(this.receiver);
+
+        stopForeground(true);
+    }
+
+    /**
+     * Start the Foreground notification process
+     */
+    private void startForeground() {
         NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
 
         NotificationChannel channel = new NotificationChannel(
@@ -66,13 +146,62 @@ public class WifiListenerService extends Service
             .setSmallIcon(R.drawable.logo)
             .setContentTitle("Pihole DNS Proxy - WiFi Listener")
             .setContentText("Listening for WiFi connection change")
+            .setContentIntent(PendingIntent.getActivity(this, 0, new Intent(this, SettingsActivity.class), Intent.FLAG_ACTIVITY_NEW_TASK))
+            .addAction(
+                R.drawable.logo,
+                "Stop Listener",
+                PendingIntent.getService(this, 0,
+                    (new Intent(this, WifiListenerService.class)).setAction(WifiListenerService.ACTION_STOP_SET_PREFERENCE),
+                    PendingIntent.FLAG_IMMUTABLE
+                )
+            )
+            .addAction(
+                R.drawable.logo,
+                "Start Proxy",
+                PendingIntent.getService(this, 0,
+                    (new Intent(this, DNSProxyService.class)).setAction(DNSProxyService.ACTION_START),
+                    PendingIntent.FLAG_IMMUTABLE
+                )
+            )
             .build();
 
         startForeground(2, notification);
     }
 
-    public void stop() {
-        unregisterReceiver(this.receiver);
-        stopForeground(true);
+    public static class OnActivationListener {
+        public static void disable(Context context) {
+            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
+            SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();
+            LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
+
+            sharedPreferencesEditor.putBoolean("use_wifi_listener_for_activation", false);
+            sharedPreferencesEditor.commit();
+
+            if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
+                context.startActivity((new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS)).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
+            }
+        }
+
+        public static boolean checkLocationNeeded(Context context) {
+            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
+
+            if (!sharedPreferences.getBoolean("use_wifi_listener_for_activation", false)) {
+                return false;
+            }
+
+            LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
+
+            return !locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
+        }
+
+        public static void askLocationIfNeeded(Activity context) {
+            if (checkLocationNeeded(context)) {
+                context.requestPermissions(new String[]{
+                    android.Manifest.permission.ACCESS_FINE_LOCATION,
+                }, 3765);
+
+                context.startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
+            }
+        }
     }
 }
-- 
cgit v1.2.3