Added saving of enabled state, added some fixes and refactorings.

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
 
     <application
         android:name=".GlobalApplication"

app/src/main/java/eu/neilalexander/yggdrasil/DnsActivity.kt

@@ -9,6 +9,7 @@ import android.view.ContextThemeWrapper
 import android.view.LayoutInflater
 import android.view.View
 import android.widget.*
+import androidx.preference.PreferenceManager
 import com.google.android.material.textfield.TextInputEditText
 
 const val KEY_DNS_SERVERS = "dns_servers"
@@ -85,7 +86,7 @@ class DnsActivity : AppCompatActivity() {
             enableChromeFix.toggle()
         }
 
-        preferences = androidx.preference.PreferenceManager.getDefaultSharedPreferences(this.baseContext)
+        preferences = PreferenceManager.getDefaultSharedPreferences(this.baseContext)
         val serverString = preferences.getString(KEY_DNS_SERVERS, "")
         servers = if (serverString!!.isNotEmpty()) {
             serverString.split(",").toMutableList()

app/src/main/java/eu/neilalexander/yggdrasil/GlobalApplication.kt

@@ -1,10 +1,15 @@
 package eu.neilalexander.yggdrasil
 
-import android.app.Application
+import android.app.*
 import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
 import android.os.Build
 import android.service.quicksettings.TileService
 import androidx.annotation.RequiresApi
+import androidx.core.app.NotificationCompat
+
+const val PREF_KEY_ENABLED = "enabled"
 
 class GlobalApplication: Application(), YggStateReceiver.StateReceiver {
     private lateinit var config: ConfigurationProxy
@@ -15,6 +20,7 @@ class GlobalApplication: Application(), YggStateReceiver.StateReceiver {
         super.onCreate()
         config = ConfigurationProxy(applicationContext)
         val callback = NetworkStateCallback(this)
+        callback.register()
         val receiver = YggStateReceiver(this)
         receiver.register(this)
     }
@@ -42,7 +48,53 @@ class GlobalApplication: Application(), YggStateReceiver.StateReceiver {
         if (state != currentState) {
             val componentName = ComponentName(this, YggTileService::class.java)
             TileService.requestListeningState(this, componentName)
+
+            if (state != State.Disabled) {
+                val notification = createServiceNotification(this, state)
+                val notificationManager: NotificationManager =
+                    this.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+                notificationManager.notify(SERVICE_NOTIFICATION_ID, notification)
+            }
+
             currentState = state
         }
     }
 }
+
+fun createServiceNotification(context: Context, state: State): Notification {
+    // Create the NotificationChannel, but only on API 26+ because
+    // the NotificationChannel class is new and not in the support library
+    val channelId = "Foreground Service"
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+        val name = context.getString(R.string.channel_name)
+        val descriptionText = context.getString(R.string.channel_description)
+        val importance = NotificationManager.IMPORTANCE_MIN
+        val channel = NotificationChannel(channelId, name, importance).apply {
+            description = descriptionText
+        }
+        // Register the channel with the system
+        val notificationManager: NotificationManager =
+            context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+        notificationManager.createNotificationChannel(channel)
+    }
+
+    val intent = Intent(context, MainActivity::class.java).apply {
+        this.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+    }
+    val pendingIntent: PendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
+
+    val text = when (state) {
+        State.Disabled -> context.getText(R.string.tile_disabled)
+        State.Enabled -> context.getText(R.string.tile_enabled)
+        State.Connected -> context.getText(R.string.tile_connected)
+        else -> context.getText(R.string.tile_disabled)
+    }
+
+    return NotificationCompat.Builder(context, channelId)
+        .setContentTitle(context.getText(R.string.app_name))
+        .setContentText(text)
+        .setSmallIcon(R.drawable.ic_tile_icon)
+        .setContentIntent(pendingIntent)
+        .setPriority(NotificationCompat.PRIORITY_MIN)
+        .build()
+}

app/src/main/java/eu/neilalexander/yggdrasil/MainActivity.kt

@@ -11,7 +11,9 @@ import android.widget.TextView
 import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.edit
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import androidx.preference.PreferenceManager
 import eu.neilalexander.yggdrasil.PacketTunnelProvider.Companion.STATE_INTENT
 import mobile.Mobile
 import org.json.JSONArray
@@ -76,6 +78,8 @@ class MainActivity : AppCompatActivity() {
                     startService(intent)
                 }
             }
+            val preferences = PreferenceManager.getDefaultSharedPreferences(this.baseContext)
+            preferences.edit(commit = true) { putBoolean(PREF_KEY_ENABLED, isChecked) }
         }
 
         val enableYggdrasilPanel = findViewById<TableRow>(R.id.enableYggdrasilPanel)
@@ -123,7 +127,7 @@ class MainActivity : AppCompatActivity() {
         LocalBroadcastManager.getInstance(this).registerReceiver(
             receiver, IntentFilter(STATE_INTENT)
         )
-        val preferences = androidx.preference.PreferenceManager.getDefaultSharedPreferences(this.baseContext)
+        val preferences = PreferenceManager.getDefaultSharedPreferences(this.baseContext)
         val serverString = preferences.getString(KEY_DNS_SERVERS, "")
         if (serverString!!.isNotEmpty()) {
             val servers = serverString.split(",")

app/src/main/java/eu/neilalexander/yggdrasil/NetworkStateCallback.kt

@@ -3,14 +3,43 @@ package eu.neilalexander.yggdrasil
 import android.content.Context
 import android.content.Intent
 import android.net.*
+import android.os.Build
 import android.util.Log
+import androidx.preference.PreferenceManager
 
 
 private const val TAG = "Network"
 
 class NetworkStateCallback(val context: Context) : ConnectivityManager.NetworkCallback() {
 
-    init {
+    override fun onAvailable(network: Network) {
+        super.onAvailable(network)
+        Log.d(TAG, "onAvailable")
+
+        val preferences = PreferenceManager.getDefaultSharedPreferences(context)
+        if (preferences.getBoolean(PREF_KEY_ENABLED, false)) {
+            Thread {
+                // The message often arrives before the connection is fully established
+                Thread.sleep(1000)
+                val intent = Intent(context, PacketTunnelProvider::class.java)
+                intent.action = PacketTunnelProvider.ACTION_CONNECT
+                try {
+                    context.startService(intent)
+                } catch (e: IllegalStateException) {
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                        context.startForegroundService(intent)
+                    }
+                }
+            }.start()
+        }
+    }
+
+    override fun onLost(network: Network) {
+        super.onLost(network)
+        Log.d(TAG, "onLost")
+    }
+
+    fun register() {
         val request = NetworkRequest.Builder()
             .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
             .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
@@ -20,22 +49,4 @@ class NetworkStateCallback(val context: Context) : ConnectivityManager.NetworkCa
         val manager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
         manager.registerNetworkCallback(request, this)
     }
-
-    override fun onAvailable(network: Network) {
-        super.onAvailable(network)
-        Log.d(TAG, "onAvailable")
-
-        Thread {
-            // The message often arrives before the connection is fully established
-            Thread.sleep(1000)
-            val intent = Intent(context, PacketTunnelProvider::class.java)
-            intent.action = PacketTunnelProvider.ACTION_CONNECT
-            context.startService(intent)
-        }.start()
-    }
-
-    override fun onLost(network: Network) {
-        super.onLost(network)
-        Log.d(TAG, "onLost")
-    }
 }

app/src/main/java/eu/neilalexander/yggdrasil/PacketTunnelProvider.kt

@@ -2,10 +2,12 @@ package eu.neilalexander.yggdrasil
 
 import android.content.*
 import android.net.VpnService
+import android.os.Build
 import android.os.ParcelFileDescriptor
 import android.system.OsConstants
 import android.util.Log
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import androidx.preference.PreferenceManager
 import eu.neilalexander.yggdrasil.YggStateReceiver.Companion.YGG_STATE_INTENT
 import mobile.Yggdrasil
 import org.json.JSONArray
@@ -16,6 +18,7 @@ import kotlin.concurrent.thread
 
 
 private const val TAG = "PacketTunnelProvider"
+const val SERVICE_NOTIFICATION_ID = 1000
 
 class PacketTunnelProvider: VpnService() {
     companion object {
@@ -55,6 +58,11 @@ class PacketTunnelProvider: VpnService() {
             Log.d(TAG, "Intent is null")
             return START_NOT_STICKY
         }
+        val preferences = PreferenceManager.getDefaultSharedPreferences(this.baseContext)
+        if (!preferences.getBoolean(PREF_KEY_ENABLED, false)) {
+            Log.d(TAG, "Service is disabled")
+            return START_NOT_STICKY
+        }
         return when (intent.action ?: ACTION_STOP) {
             ACTION_STOP -> {
                 Log.d(TAG, "Stopping...")
@@ -89,6 +97,9 @@ class PacketTunnelProvider: VpnService() {
             return
         }
 
+        val notification = createServiceNotification(this, State.Enabled)
+        startForeground(SERVICE_NOTIFICATION_ID, notification)
+
         Log.d(TAG, config.getJSON().toString())
         yggdrasil.startJSON(config.getJSONByteArray())
 
@@ -112,11 +123,11 @@ class PacketTunnelProvider: VpnService() {
         // If we don't set metered status of VPN it is considered as metered.
         // If we set it to false, then it will inherit this status from underlying network.
         // See: https://developer.android.com/reference/android/net/VpnService.Builder#setMetered(boolean)
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
             builder.setMetered(false)
         }
 
-        val preferences = androidx.preference.PreferenceManager.getDefaultSharedPreferences(this.baseContext)
+        val preferences = PreferenceManager.getDefaultSharedPreferences(this.baseContext)
         val serverString = preferences.getString(KEY_DNS_SERVERS, "")
         if (serverString!!.isNotEmpty()) {
             val servers = serverString.split(",")
@@ -207,6 +218,7 @@ class PacketTunnelProvider: VpnService() {
         intent.putExtra("state", STATE_DISABLED)
         LocalBroadcastManager.getInstance(this).sendBroadcast(intent)
 
+        stopForeground(true)
         stopSelf()
     }
 
@@ -236,10 +248,12 @@ class PacketTunnelProvider: VpnService() {
                 val intent = Intent(YGG_STATE_INTENT)
                 var state = STATE_ENABLED
                 val dht = yggdrasil.dhtjson
+                if (dht != null && dht != "null") {
                     val dhtState = JSONArray(dht)
                     val count = dhtState.length()
                     if (count > 1)
                         state = STATE_CONNECTED
+                }
                 intent.putExtra("state", state)
                 LocalBroadcastManager.getInstance(this).sendBroadcast(intent)
                 lastStateUpdate = curTime

app/src/main/java/eu/neilalexander/yggdrasil/YggTileService.kt

@@ -8,6 +8,8 @@ import android.service.quicksettings.Tile
 import android.service.quicksettings.TileService
 import android.util.Log
 import androidx.annotation.RequiresApi
+import androidx.core.content.edit
+import androidx.preference.PreferenceManager
 
 private const val TAG = "TileService"
 
@@ -63,6 +65,11 @@ class YggTileService: TileService(), YggStateReceiver.StateReceiver {
 
     override fun onClick() {
         super.onClick()
+        // Saving new state
+        val preferences = PreferenceManager.getDefaultSharedPreferences(this.baseContext)
+        val enabled = preferences.getBoolean(PREF_KEY_ENABLED, false)
+        preferences.edit(commit = true) { putBoolean(PREF_KEY_ENABLED, !enabled) }
+        // Starting or stopping VPN service
         val intent = Intent(this, PacketTunnelProvider::class.java)
         intent.action = PacketTunnelProvider.ACTION_TOGGLE
         startService(intent)
@@ -71,12 +78,11 @@ class YggTileService: TileService(), YggStateReceiver.StateReceiver {
     private fun updateTileState(state: State) {
         val tile = qsTile ?: return
         val oldState = tile.state
-        tile.state = when (state) {
+        val preferences = PreferenceManager.getDefaultSharedPreferences(this.baseContext)
-            State.Unknown -> Tile.STATE_UNAVAILABLE
+        val enabled = preferences.getBoolean(PREF_KEY_ENABLED, false)
-            State.Disabled -> Tile.STATE_INACTIVE
+        tile.state = when (enabled) {
-            State.Enabled -> Tile.STATE_ACTIVE
+            false -> Tile.STATE_INACTIVE
-            State.Connected -> Tile.STATE_ACTIVE
+            true -> Tile.STATE_ACTIVE
-            State.Reconnecting -> Tile.STATE_ACTIVE
         }
         var changed = oldState != tile.state
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {

app/src/main/res/values-ru/strings.xml

@@ -22,8 +22,8 @@
     <string name="dns_one_server">1 сервер</string>
     <string name="dns_many_servers">%d сервера/серверов</string>
     <string name="dns_remove_title">Убрать %s?</string>
-    <string name="main_no_connectivity">Нет подключения</string>
+    <string name="main_no_connectivity">Включено (Нет подключения)</string>
-    <string name="main_enabled">Включено</string>
+    <string name="main_enabled">Подключено</string>
     <string name="main_disabled">Выключено</string>
     <string name="main_no_peers">Нет пиров</string>
     <string name="main_one_peer">1 пир</string>
@@ -66,10 +66,12 @@
     <string name="reset_configuration">Сбросить настройки</string>
     <string name="reset_configuration_hint">Сброс создаст полностью новые настройки. Это изменит ваш публичный ключ и адрес IP.</string>
     <string name="tile_disabled">Выключено</string>
-    <string name="tile_enabled">Включено</string>
+    <string name="tile_enabled">Включено (Нет подключения)</string>
     <string name="tile_connected">Подключено</string>
     <string name="location_amsterdam">Амстердам, Нидерланды</string>
     <string name="location_prague">Прага, Чехия</string>
     <string name="location_bratislava">Братислава, Словакия</string>
     <string name="location_buffalo">Баффало, США</string>
+    <string name="channel_name">Сервис VPN</string>
+    <string name="channel_description">Главный канал нотификаций сервиса</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -22,8 +22,8 @@
     <string name="dns_one_server">1 server</string>
     <string name="dns_many_servers">%d server</string>
     <string name="dns_remove_title">Remove %s?</string>
-    <string name="main_no_connectivity">No connectivity</string>
+    <string name="main_no_connectivity">Enabled (No connectivity)</string>
-    <string name="main_enabled">Enabled</string>
+    <string name="main_enabled">Connected</string>
     <string name="main_disabled">Not enabled</string>
     <string name="main_no_peers">No peers</string>
     <string name="main_one_peer">1 peer</string>
@@ -66,10 +66,12 @@
     <string name="reset_configuration">Reset configuration</string>
     <string name="reset_configuration_hint">Resetting will overwrite with newly generated configuration. Your public keys and IP address on the network will change.</string>
     <string name="tile_disabled">Disabled</string>
-    <string name="tile_enabled">Enabled</string>
+    <string name="tile_enabled">Enabled (No connectivity)</string>
     <string name="tile_connected">Connected</string>
     <string name="location_amsterdam">Amsterdam, NL</string>
     <string name="location_prague">Prague, CZ</string>
     <string name="location_bratislava">Bratislava, SK</string>
     <string name="location_buffalo">Buffalo, US</string>
+    <string name="channel_name">VPN Service</string>
+    <string name="channel_description">Main channel for foreground notification</string>
 </resources>