1. VPN DNS refactoring, GUI refactoring

app/src/main/AndroidManifest.xml

@@ -12,7 +12,6 @@
             android:label="@string/app_name"
             android:roundIcon="@mipmap/ic_launcher_round"
             android:supportsRtl="true"
-            android:theme="@style/AppTheme"
             tools:ignore="GoogleAppIndexingWarning">
         <activity
                 android:name=".PeerListActivity"
@@ -35,6 +34,8 @@
         </service>
 
         <activity android:name=".MainActivity"
+                android:label="@string/app_name"
+                android:theme="@style/AppTheme.NoActionBar"
                 android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/io/github/chronosx88/yggdrasil/MainActivity.kt

@@ -10,8 +10,6 @@ import android.net.VpnService
 import android.os.Bundle
 import android.util.Log
 import android.view.Gravity
-import android.view.Menu
-import android.view.MenuItem
 import android.view.View
 import android.widget.*
 import androidx.appcompat.app.AppCompatActivity
@@ -34,6 +32,7 @@ class MainActivity : AppCompatActivity() {
         const val COMMAND = "COMMAND"
         const val STOP = "STOP"
         const val START = "START"
+        const val UPDATE_DNS = "UPDATE_DNS"
         const val PARAM_PINTENT = "pendingIntent"
         const val STATUS_START = 7
         const val STATUS_FINISH = 8
@@ -52,6 +51,7 @@ class MainActivity : AppCompatActivity() {
         private const val VPN_REQUEST_CODE = 0x0F
 
         @JvmStatic var isStarted = false
+        @JvmStatic var isCancelled = false
 
     }
 
@@ -62,19 +62,41 @@ class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        setSupportActionBar(findViewById(R.id.toolbar))
         if(intent.extras!==null) {
             startVpnFlag = intent.extras!!.getBoolean(START_VPN, false)
             isStarted = true
+            //startVpn()
         } else {
             isStarted = isYggServiceRunning(this)
         }
-        val listView = findViewById<ListView>(R.id.peers)
+
+        val switchOn = findViewById<Switch>(R.id.switchOn)
+        switchOn.isChecked = isStarted
+        switchOn.setOnCheckedChangeListener { _, isChecked ->
+            if(currentPeers.isEmpty()){
+                switchOn.isChecked = false
+                return@setOnCheckedChangeListener
+            }
+            if(isCancelled){
+                switchOn.isChecked = false
+                isCancelled = false
+                return@setOnCheckedChangeListener
+            }
+            if (isChecked) {
+                startVpn()
+            } else {
+                stopVpn()
+            }
+        }
+
+        val peersListView = findViewById<ListView>(R.id.peers)
         //save to shared preferences
         val preferences =
             PreferenceManager.getDefaultSharedPreferences(this.baseContext)
         currentPeers = deserializeStringSet2PeerInfoSet(preferences.getStringSet(CURRENT_PEERS, HashSet())!!)
         val adapter = PeerInfoListAdapter(this, currentPeers.sortedWith(compareBy { it.ping }))
-        listView.adapter = adapter
+        peersListView.adapter = adapter
 
         val copyAddressButton = findViewById<Button>(R.id.copyIp)
         copyAddressButton.setOnClickListener {
@@ -133,6 +155,17 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
+    private fun updateDNS(){
+        Log.d(TAG,"Update DNS")
+        val intent = Intent(this, YggdrasilTunService::class.java)
+        val TASK_CODE = 100
+        val pi = createPendingResult(TASK_CODE, intent, 0)
+        intent.putExtra(PARAM_PINTENT, pi)
+        intent.putExtra(COMMAND, UPDATE_DNS)
+        intent.putStringArrayListExtra(DNS, serializeDNSInfoSet2StringList(currentDNS))
+        startService(intent)
+    }
+
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
 
@@ -151,7 +184,7 @@ class MainActivity : AppCompatActivity() {
             startService(intent)
         }
         if (requestCode == VPN_REQUEST_CODE && resultCode== Activity.RESULT_CANCELED){
-            //TODO implement
+            isCancelled = true
         }
         if (requestCode == PEER_LIST_CODE && resultCode== Activity.RESULT_OK){
             if(data!!.extras!=null){
@@ -197,15 +230,7 @@ class MainActivity : AppCompatActivity() {
                         PreferenceManager.getDefaultSharedPreferences(this.baseContext)
                     preferences.edit().putStringSet(CURRENT_DNS, HashSet(currentDNS)).apply()
                     if(isStarted){
-                        //TODO implement UpdateConfig method in native interface and apply peer changes
+                        updateDNS()
-                        stopVpn()
-                        finish()
-                        val i = baseContext.packageManager
-                            .getLaunchIntentForPackage(baseContext.packageName)
-                        i!!.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
-                        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
-                        i.putExtra(START_VPN, true)
-                        startActivity(i)
                     }
                 }
             }
@@ -231,34 +256,6 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
-    override fun onCreateOptionsMenu(menu: Menu): Boolean {
-        // Inflate the menu; this adds items to the action bar if it is present.
-        menuInflater.inflate(R.menu.main_menu, menu)
-        val item = menu.findItem(R.id.switchId) as MenuItem
-        item.setActionView(R.layout.menu_switch)
-        val switchOn = item
-            .actionView.findViewById<Switch>(R.id.switchOn)
-        if(isStarted){
-            switchOn.isChecked = true
-            if(startVpnFlag) {
-                startVpn()
-            }
-        }
-        switchOn.setOnCheckedChangeListener { _, isChecked ->
-            if(currentPeers.isEmpty()){
-                switchOn.isChecked = false
-                return@setOnCheckedChangeListener
-            }
-            if (isChecked) {
-                startVpn()
-            } else {
-                stopVpn()
-            }
-
-        }
-        return true
-    }
-
     private fun showToast(text: String){
         val duration = Toast.LENGTH_SHORT
         val toast = Toast.makeText(applicationContext, text, duration)

app/src/main/java/io/github/chronosx88/yggdrasil/YggdrasilTunService.kt

@@ -10,6 +10,7 @@ import com.google.gson.Gson
 import dummy.ConduitEndpoint
 import io.github.chronosx88.yggdrasil.models.DNSInfo
 import io.github.chronosx88.yggdrasil.models.PeerInfo
+import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.convertPeerInfoSet2PeerIdSet
 import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.deserializeStringList2DNSInfoSet
 import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.deserializeStringList2PeerInfoSet
 import kotlinx.coroutines.*
@@ -29,20 +30,12 @@ class YggdrasilTunService : VpnService() {
 
     companion object {
         private const val TAG = "Yggdrasil-service"
-
-        @JvmStatic
-        fun convertPeerInfoSet2PeerIdSet(list: Set<PeerInfo>): Set<String> {
-            var out = mutableSetOf<String>()
-            for(p in list) {
-                out.add(p.toString())
-            }
-            return out
-        }
     }
     private var tunInterface: ParcelFileDescriptor? = null
     private var tunInputStream: InputStream? = null
     private var tunOutputStream: OutputStream? = null
     private var scope: CoroutineScope? = null
+    private var address: String? = null
 
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
 
@@ -57,10 +50,37 @@ class YggdrasilTunService : VpnService() {
             ygg = Yggdrasil()
             setupTunInterface(pi, peers, dns)
         }
+        if (intent?.getStringExtra(MainActivity.COMMAND) == MainActivity.UPDATE_DNS) {
+            val pi: PendingIntent = intent.getParcelableExtra(MainActivity.PARAM_PINTENT)
+            val dns = deserializeStringList2DNSInfoSet(intent.getStringArrayListExtra(MainActivity.DNS))
+            setupIOStreams(dns)
+        }
 
         return super.onStartCommand(intent, flags, startId)
     }
 
+    private fun setupIOStreams(dns: MutableSet<DNSInfo>){
+        address = ygg.addressString
+        var builder = Builder()
+            .addAddress(address, 7)
+            .allowFamily(OsConstants.AF_INET)
+            .setMtu(MAX_PACKET_SIZE)
+        if (dns.size > 0) {
+            for (d in dns) {
+                builder.addDnsServer(d.address)
+            }
+        }
+        if(tunInterface!=null){
+            tunInterface!!.close()
+            tunInputStream!!.close()
+            tunOutputStream!!.close()
+        }
+        tunInterface = builder.establish()
+        tunInputStream = FileInputStream(tunInterface!!.fileDescriptor)
+        tunOutputStream = FileOutputStream(tunInterface!!.fileDescriptor)
+
+    }
+
     private fun setupTunInterface(
         pi: PendingIntent,
         peers: Set<PeerInfo>,
@@ -74,32 +94,16 @@ class YggdrasilTunService : VpnService() {
         configJson = gson.toJson(config).toByteArray()
 
         var yggConduitEndpoint = ygg.startJSON(configJson)
-        val address = ygg.addressString // hack for getting generic ipv6 string from NodeID
 
-        var builder = Builder()
+        setupIOStreams(dns)
-            .addAddress(address, 7)
+
-            .allowFamily(OsConstants.AF_INET)
-            .setMtu(MAX_PACKET_SIZE)
-        if (dns.size > 0) {
-            for (d in dns) {
-                builder.addDnsServer(d.address)
-            }
-        }
-        tunInterface = builder.establish()
-        tunInputStream = FileInputStream(tunInterface!!.fileDescriptor)
-        tunOutputStream = FileOutputStream(tunInterface!!.fileDescriptor)
         val job = SupervisorJob()
         scope = CoroutineScope(Dispatchers.Default + job)
         scope!!.launch {
             val buffer = ByteArray(2048)
-            try {
             while (!isClosed) {
                 readPacketsFromTun(yggConduitEndpoint, buffer)
             }
-            } catch (e: IOException) {
-                e.printStackTrace()
-                tunInputStream!!.close()
-            }
         }
         scope!!.launch {
             while (!isClosed) {
@@ -144,6 +148,7 @@ class YggdrasilTunService : VpnService() {
 
     private fun readPacketsFromTun(yggConduitEndpoint: ConduitEndpoint, buffer: ByteArray) {
         // Read the outgoing packet from the input stream.
+         try{
             val length = tunInputStream!!.read(buffer)
             if (length > 0) {
                 val byteBuffer = ByteBuffer.allocate(length)
@@ -152,10 +157,12 @@ class YggdrasilTunService : VpnService() {
             } else {
                 Thread.sleep(10)
             }
+        }catch(e: IOException){
+            e.printStackTrace()
+        }
     }
 
     private fun writePacketsToTun(yggConduitEndpoint: ConduitEndpoint) {
-        if(tunOutputStream != null) {
         val buffer = yggConduitEndpoint.recv()
         if(buffer!=null) {
             try {
@@ -165,7 +172,6 @@ class YggdrasilTunService : VpnService() {
             }
         }
     }
-    }
 
     private fun stopVpn(pi: PendingIntent) {
         isClosed = true;

app/src/main/java/io/github/chronosx88/yggdrasil/models/config/Utils.kt

@@ -86,5 +86,14 @@ class Utils {
             return (System.currentTimeMillis() - start).toInt()
         }
 
+        @JvmStatic
+        fun convertPeerInfoSet2PeerIdSet(list: Set<PeerInfo>): Set<String> {
+            var out = mutableSetOf<String>()
+            for(p in list) {
+                out.add(p.toString())
+            }
+            return out
+        }
+
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -1,158 +1,48 @@
-<androidx.constraintlayout.widget.ConstraintLayout
+<?xml version="1.0" encoding="utf-8"?>
-        xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         xmlns:tools="http://schemas.android.com/tools"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:background="@color/grey"
+        tools:context=".MainActivity"
-        tools:context=".MainActivity">
+        android:background="@color/grey">
 
-    <LinearLayout
+    <com.google.android.material.appbar.AppBarLayout
-            android:id="@+id/ipLayout"
+            android:id="@+id/appBarLayout"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_margin="20dp"
+            android:theme="@style/AppTheme.AppBarOverlay">
-            android:background="@drawable/info_panel_rounded_corner"
+
-            android:gravity="left"
-            android:paddingLeft="20dp"
-            android:orientation="vertical"
-            app:layout_constraintTop_toTopOf="parent"
-            android:animateLayoutChanges="true"
-            android:visibility="gone">
         <androidx.constraintlayout.widget.ConstraintLayout
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                app:layout_constraintTop_toTopOf="parent">
-            <TextView
-                    android:id="@+id/ipLabel"
-                    android:layout_width="match_parent"
-                    android:layout_height="40dp"
-                    android:background="@android:color/transparent"
-                    android:elevation="8dp"
-                    android:gravity="center_vertical"
-                    android:text="IP address:"
-                    app:layout_constraintBottom_toBottomOf="parent"
-                    app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toTopOf="parent"
-                    android:textColor="@color/dark_30"
-                    />
-            <Button
-                    android:id="@+id/copyIp"
-                    android:layout_width="wrap_content"
                 android:layout_height="match_parent"
-                    android:text="COPY"
+                android:orientation="horizontal">
-                    app:layout_constraintEnd_toEndOf="parent"
-                    android:background="@android:color/transparent"/>
-        </androidx.constraintlayout.widget.ConstraintLayout>
 
-            <TextView
+            <androidx.appcompat.widget.Toolbar
-                    android:id="@+id/ip"
+                    android:id="@+id/toolbar"
                     android:layout_width="match_parent"
-                    android:layout_height="30dp"
+                    android:layout_height="?attr/actionBarSize"
-                    android:background="@android:color/transparent"
+                    android:layout_marginEnd="70dp"
-                    android:elevation="8dp"
+                    android:background="?attr/colorPrimary"
-                    android:gravity="center_vertical"
                     app:layout_constraintBottom_toBottomOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toTopOf="parent"
-                    app:layout_constraintEnd_toStartOf="@+id/copyIp"
+                    app:popupTheme="@style/AppTheme.PopupOverlay" />
-                    android:text=""
-                    android:textColor="@color/white"/>
-    </LinearLayout>
 
-    <LinearLayout
+            <Switch
-            android:id="@+id/peerLayout"
+                    android:id="@+id/switchOn"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_margin="20dp"
-            android:background="@drawable/info_panel_rounded_corner"
-            android:gravity="left"
-            android:paddingLeft="20dp"
-            android:orientation="vertical"
-            app:layout_constraintTop_toBottomOf="@id/ipLayout">
-        <androidx.constraintlayout.widget.ConstraintLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                app:layout_constraintTop_toTopOf="parent">
-
-            <TextView
-                    android:id="@+id/ipPeers"
                     android:layout_width="wrap_content"
-                    android:layout_height="40dp"
+                    android:layout_height="wrap_content"
-                    android:background="@android:color/transparent"
+                    android:layout_margin="10dp"
-                    android:elevation="8dp"
+                    android:theme="@style/SwitchTheme"
-                    android:gravity="center_vertical"
-                    android:text="Peers:"
-                    android:textColor="@color/dark_30"
                     app:layout_constraintBottom_toBottomOf="parent"
-                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintEnd_toEndOf="parent"
+
                     app:layout_constraintTop_toTopOf="parent" />
-            <Button
-                    android:id="@+id/edit"
-                    android:layout_width="wrap_content"
-                    android:layout_height="match_parent"
-                    android:text="EDIT"
-                    app:layout_constraintEnd_toEndOf="parent"
-                    android:background="@android:color/transparent"/>
         </androidx.constraintlayout.widget.ConstraintLayout>
 
-        <ListView
+    </com.google.android.material.appbar.AppBarLayout>
-                android:id="@+id/peers"
-                android:layout_width="match_parent"
-                android:layout_height="match_parent"
-                android:gravity="center_vertical"
-                android:layout_marginBottom="10dp"
-                android:dividerHeight="0dp"
-                android:divider="@null"
-                app:layout_constraintTop_toTopOf="parent"/>
 
-    </LinearLayout>
+    <include layout="@layout/content_main" />
 
-    <LinearLayout
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_margin="20dp"
-            android:background="@drawable/info_panel_rounded_corner"
-            android:gravity="left"
-            android:paddingLeft="20dp"
-            android:orientation="vertical"
-            app:layout_constraintTop_toBottomOf="@id/peerLayout">
-        <androidx.constraintlayout.widget.ConstraintLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                app:layout_constraintTop_toTopOf="parent">
-
-            <TextView
-                    android:id="@+id/dnsLabel"
-                    android:layout_width="wrap_content"
-                    android:layout_height="40dp"
-                    android:background="@android:color/transparent"
-                    android:elevation="8dp"
-                    android:gravity="center_vertical"
-                    android:text="DNS:"
-                    android:textColor="@color/dark_30"
-                    app:layout_constraintBottom_toBottomOf="parent"
-                    app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toTopOf="parent" />
-            <Button
-                    android:id="@+id/editDNS"
-                    android:layout_width="wrap_content"
-                    android:layout_height="match_parent"
-                    android:text="EDIT"
-                    app:layout_constraintEnd_toEndOf="parent"
-                    android:background="@android:color/transparent"/>
-
-        </androidx.constraintlayout.widget.ConstraintLayout>
-        <ListView
-                android:id="@+id/dns"
-                android:layout_width="match_parent"
-                android:layout_height="match_parent"
-                android:gravity="center_vertical"
-                android:layout_marginBottom="10dp"
-                android:dividerHeight="0dp"
-                android:divider="@null"
-                app:layout_constraintTop_toTopOf="parent"/>
-
-    </LinearLayout>
-
-</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/content_main.xml

@@ -0,0 +1,156 @@
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior"
+        android:background="@color/grey">
+
+    <LinearLayout
+            android:id="@+id/ipLayout"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_margin="20dp"
+            android:background="@drawable/info_panel_rounded_corner"
+            android:gravity="left"
+            android:paddingLeft="20dp"
+            android:orientation="vertical"
+            app:layout_constraintTop_toTopOf="parent"
+            android:animateLayoutChanges="true"
+            android:visibility="gone">
+        <androidx.constraintlayout.widget.ConstraintLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                app:layout_constraintTop_toTopOf="parent">
+            <TextView
+                    android:id="@+id/ipLabel"
+                    android:layout_width="match_parent"
+                    android:layout_height="40dp"
+                    android:background="@android:color/transparent"
+                    android:elevation="8dp"
+                    android:gravity="center_vertical"
+                    android:text="IP address:"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent"
+                    android:textColor="@color/dark_30"
+                    />
+            <Button
+                    android:id="@+id/copyIp"
+                    android:layout_width="wrap_content"
+                    android:layout_height="match_parent"
+                    android:text="COPY"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    android:background="@android:color/transparent"/>
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
+        <TextView
+                android:id="@+id/ip"
+                android:layout_width="match_parent"
+                android:layout_height="30dp"
+                android:background="@android:color/transparent"
+                android:elevation="8dp"
+                android:gravity="center_vertical"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintEnd_toStartOf="@+id/copyIp"
+                android:text=""
+                android:textColor="@color/white"/>
+    </LinearLayout>
+
+    <LinearLayout
+            android:id="@+id/peerLayout"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_margin="20dp"
+            android:background="@drawable/info_panel_rounded_corner"
+            android:gravity="left"
+            android:paddingLeft="20dp"
+            android:orientation="vertical"
+            app:layout_constraintTop_toBottomOf="@id/ipLayout">
+        <androidx.constraintlayout.widget.ConstraintLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                app:layout_constraintTop_toTopOf="parent">
+
+            <TextView
+                    android:id="@+id/ipPeers"
+                    android:layout_width="wrap_content"
+                    android:layout_height="40dp"
+                    android:background="@android:color/transparent"
+                    android:elevation="8dp"
+                    android:gravity="center_vertical"
+                    android:text="Peers:"
+                    android:textColor="@color/dark_30"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent" />
+            <Button
+                    android:id="@+id/edit"
+                    android:layout_width="wrap_content"
+                    android:layout_height="match_parent"
+                    android:text="EDIT"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    android:background="@android:color/transparent"/>
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
+        <ListView
+                android:id="@+id/peers"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:gravity="center_vertical"
+                android:layout_marginBottom="10dp"
+                android:dividerHeight="0dp"
+                android:divider="@null"
+                app:layout_constraintTop_toTopOf="parent"/>
+
+    </LinearLayout>
+
+    <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_margin="20dp"
+            android:background="@drawable/info_panel_rounded_corner"
+            android:gravity="left"
+            android:paddingLeft="20dp"
+            android:orientation="vertical"
+            app:layout_constraintTop_toBottomOf="@id/peerLayout">
+        <androidx.constraintlayout.widget.ConstraintLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                app:layout_constraintTop_toTopOf="parent">
+
+            <TextView
+                    android:id="@+id/dnsLabel"
+                    android:layout_width="wrap_content"
+                    android:layout_height="40dp"
+                    android:background="@android:color/transparent"
+                    android:elevation="8dp"
+                    android:gravity="center_vertical"
+                    android:text="DNS:"
+                    android:textColor="@color/dark_30"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent" />
+            <Button
+                    android:id="@+id/editDNS"
+                    android:layout_width="wrap_content"
+                    android:layout_height="match_parent"
+                    android:text="EDIT"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    android:background="@android:color/transparent"/>
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+        <ListView
+                android:id="@+id/dns"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:gravity="center_vertical"
+                android:layout_marginBottom="10dp"
+                android:dividerHeight="0dp"
+                android:divider="@null"
+                app:layout_constraintTop_toTopOf="parent"/>
+
+    </LinearLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/menu_switch.xml

@@ -3,12 +3,5 @@
         xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
-    <Switch
+
-            android:id="@+id/switchOn"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_centerHorizontal="true"
-            android:layout_centerVertical="true"
-            android:layout_margin="10dp"
-            android:theme="@style/SwitchTheme"/>
 </RelativeLayout>