Display local IP addresses & Safe messages parsing

README.md

@@ -1,5 +1,5 @@
 # AIRA Android
-AIRA is peer-to-peer encrypted communication tool for local networks built on the [PSEC protocol](https://forge.chapril.org/hardcoresushi/PSEC). It allows to securely send text messages and files without any server or Internet access.
+AIRA is peer-to-peer encrypted communication tool for local networks built on the [PSEC protocol](https://forge.chapril.org/hardcoresushi/PSEC). It allows to securely send text messages and files without any server or Internet access. AIRA automatically discovers and connects to other peers on your network, so you don't need any prior configuration to start communicating.
 
 Here is the Android version. You can find the original AIRA desktop version [here](https://forge.chapril.org/hardcoresushi/AIRA).
 

app/build.gradle

@@ -40,7 +40,7 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     implementation 'androidx.core:core-ktx:1.3.2'
     implementation 'androidx.appcompat:appcompat:1.2.0'
-    implementation "androidx.fragment:fragment-ktx:1.3.2"
+    implementation "androidx.fragment:fragment-ktx:1.3.3"
     implementation "androidx.preference:preference-ktx:1.1.1"
     implementation 'com.google.android.material:material:1.3.0'
     //implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

app/src/main/AndroidManifest.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    package="sushi.hardcore.aira">
+    package="sushi.hardcore.aira"
+    android:installLocation="auto">
 
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
     <uses-permission android:name="android.permission.INTERNET"/>

app/src/main/java/sushi/hardcore/aira/ChatActivity.kt

@@ -7,8 +7,6 @@ import android.provider.OpenableColumns
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
-import android.widget.LinearLayout
-import android.widget.TextView
 import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AlertDialog
@@ -21,6 +19,8 @@ import sushi.hardcore.aira.background_service.AIRAService
 import sushi.hardcore.aira.background_service.Protocol
 import sushi.hardcore.aira.background_service.ReceiveFileTransfer
 import sushi.hardcore.aira.databinding.ActivityChatBinding
+import sushi.hardcore.aira.databinding.DialogFingerprintsBinding
+import sushi.hardcore.aira.databinding.DialogInfoBinding
 import sushi.hardcore.aira.utils.FileUtils
 import sushi.hardcore.aira.utils.StringUtils
 import java.util.*
@@ -36,7 +36,7 @@ class ChatActivity : AppCompatActivity() {
     private var lastLoadedMessageOffset = 0
     private var isActivityInForeground = false
     private val filePicker = registerForActivityResult(ActivityResultContracts.GetContent()) { uri ->
-        if (::airaService.isInitialized) {
+        if (::airaService.isInitialized && uri != null) {
             contentResolver.query(uri, null, null, null, null)?.let { cursor ->
                 if (cursor.moveToFirst()) {
                     contentResolver.openInputStream(uri)?.let { inputStream ->
@@ -238,13 +238,14 @@ class ChatActivity : AppCompatActivity() {
                 val contact = airaService.contacts[sessionId]
                 val session = airaService.sessions[sessionId]
                 val publicKey = contact?.publicKey ?: session?.peerPublicKey
-                val dialogView = layoutInflater.inflate(R.layout.dialog_info, null)
+                val dialogBinding = DialogInfoBinding.inflate(layoutInflater)
-                dialogView.findViewById<TextView>(R.id.text_fingerprint).text = StringUtils.beautifyFingerprint(generateFingerprint(publicKey!!))
+                dialogBinding.textAvatar.setLetterFrom(sessionName)
+                dialogBinding.textFingerprint.text = StringUtils.beautifyFingerprint(generateFingerprint(publicKey!!))
                 if (session == null) {
-                    dialogView.findViewById<LinearLayout>(R.id.online_fields).visibility = View.GONE
+                    dialogBinding.onlineFields.visibility = View.GONE
                 } else {
-                    dialogView.findViewById<TextView>(R.id.text_ip).text = session.ip
+                    dialogBinding.textIp.text = session.ip
-                    dialogView.findViewById<TextView>(R.id.text_outgoing).text = getString(if (session.outgoing) {
+                    dialogBinding.textOutgoing.text = getString(if (session.outgoing) {
                         R.string.outgoing
                     } else {
                         R.string.incoming
@@ -252,7 +253,7 @@ class ChatActivity : AppCompatActivity() {
                 }
                 AlertDialog.Builder(this)
                         .setTitle(sessionName)
-                        .setView(dialogView)
+                        .setView(dialogBinding.root)
                         .setPositiveButton(R.string.ok, null)
                         .show()
                 true
@@ -282,12 +283,12 @@ class ChatActivity : AppCompatActivity() {
                 airaService.contacts[sessionId]?.let { contact ->
                     val localFingerprint = StringUtils.beautifyFingerprint(AIRADatabase.getIdentityFingerprint())
                     val peerFingerprint = StringUtils.beautifyFingerprint(generateFingerprint(contact.publicKey))
-                    val dialogView = layoutInflater.inflate(R.layout.dialog_fingerprints, null)
+                    val dialogBinding = DialogFingerprintsBinding.inflate(layoutInflater)
-                    dialogView.findViewById<TextView>(R.id.text_local_fingerprint).text = localFingerprint
+                    dialogBinding.textLocalFingerprint.text = localFingerprint
-                    dialogView.findViewById<TextView>(R.id.text_peer_fingerprint).text = peerFingerprint
+                    dialogBinding.textPeerFingerprint.text = peerFingerprint
                     AlertDialog.Builder(this)
                         .setTitle(R.string.verifying_contact)
-                        .setView(dialogView)
+                        .setView(dialogBinding.root)
                         .setPositiveButton(R.string.they_match) { _, _ ->
                             if (airaService.setVerified(sessionId)) {
                                 invalidateOptionsMenu()

app/src/main/java/sushi/hardcore/aira/MainActivity.kt

@@ -10,6 +10,7 @@ import android.os.IBinder
 import android.provider.OpenableColumns
 import android.view.Menu
 import android.view.MenuItem
+import android.widget.AbsListView
 import android.widget.AdapterView
 import android.widget.Toast
 import androidx.appcompat.app.AlertDialog
@@ -19,13 +20,31 @@ import sushi.hardcore.aira.adapters.SessionAdapter
 import sushi.hardcore.aira.background_service.AIRAService
 import sushi.hardcore.aira.background_service.ReceiveFileTransfer
 import sushi.hardcore.aira.databinding.ActivityMainBinding
+import sushi.hardcore.aira.databinding.DialogIpAddressesBinding
 import sushi.hardcore.aira.utils.FileUtils
+import sushi.hardcore.aira.utils.StringUtils
+import java.lang.StringBuilder
+import java.net.NetworkInterface
 
 class MainActivity : AppCompatActivity() {
     private lateinit var binding: ActivityMainBinding
     private lateinit var airaService: AIRAService
     private lateinit var onlineSessionAdapter: SessionAdapter
     private lateinit var offlineSessionAdapter: SessionAdapter
+    private val onSessionsItemClick = AdapterView.OnItemClickListener { adapter, _, position, _ ->
+        launchChatActivity(adapter.getItemAtPosition(position) as Session)
+    }
+    private val onSessionsItemClickSendFile = AdapterView.OnItemClickListener { adapter, _, position, _ ->
+        askShareFileTo(adapter.getItemAtPosition(position) as Session)
+    }
+    private val onSessionsScrollListener = object : AbsListView.OnScrollListener {
+        override fun onScrollStateChanged(view: AbsListView?, scrollState: Int) {}
+        override fun onScroll(listView: AbsListView, firstVisibleItem: Int, visibleItemCount: Int, totalItemCount: Int) {
+            if (listView.getChildAt(0) != null) {
+                binding.refresher.isEnabled = listView.firstVisiblePosition == 0 && listView.getChildAt(0).top == 0
+            }
+        }
+    }
     private val uiCallbacks = object : AIRAService.UiCallbacks {
         override fun onNewSession(sessionId: Int, ip: String) {
             runOnUiThread {
@@ -75,27 +94,21 @@ class MainActivity : AppCompatActivity() {
         binding.onlineSessions.apply {
             adapter = onlineSessionAdapter
             onItemClickListener = if (openedToShareFile) {
-                    AdapterView.OnItemClickListener { _, _, position, _ ->
+                    onSessionsItemClickSendFile
-                        askShareFileTo(onlineSessionAdapter.getItem(position))
-                    }
                 } else {
-                    AdapterView.OnItemClickListener { _, _, position, _ ->
+                    onSessionsItemClick
-                        launchChatActivity(onlineSessionAdapter.getItem(position))
-                    }
                 }
+            setOnScrollListener(onSessionsScrollListener)
         }
         offlineSessionAdapter = SessionAdapter(this)
         binding.offlineSessions.apply {
             adapter = offlineSessionAdapter
             onItemClickListener = if (openedToShareFile) {
-                AdapterView.OnItemClickListener { _, _, position, _ ->
+                    onSessionsItemClickSendFile
-                    askShareFileTo(offlineSessionAdapter.getItem(position))
+                } else {
+                    onSessionsItemClick
                 }
-            } else {
+            setOnScrollListener(onSessionsScrollListener)
-                AdapterView.OnItemClickListener { _, _, position, _ ->
-                    launchChatActivity(offlineSessionAdapter.getItem(position))
-                }
-            }
         }
         Intent(this, AIRAService::class.java).also { serviceIntent ->
             bindService(serviceIntent, object : ServiceConnection {
@@ -121,6 +134,23 @@ class MainActivity : AppCompatActivity() {
             }, Context.BIND_AUTO_CREATE)
         }
 
+        binding.buttonShowIp.setOnClickListener {
+            val ipAddresses = StringBuilder()
+            for (iface in NetworkInterface.getNetworkInterfaces()) {
+                for (addr in iface.inetAddresses) {
+                    if (!addr.isLoopbackAddress) {
+                        ipAddresses.appendLine(StringUtils.getIpFromInetAddress(addr)+" ("+iface.displayName+')')
+                    }
+                }
+            }
+            val dialogBinding = DialogIpAddressesBinding.inflate(layoutInflater)
+            dialogBinding.textIpAddresses.text = ipAddresses.substring(0, ipAddresses.length-1) //remove last LF
+            AlertDialog.Builder(this)
+                    .setTitle(R.string.your_addresses)
+                    .setView(dialogBinding.root)
+                    .setPositiveButton(R.string.ok, null)
+                    .show()
+        }
         binding.editPeerIp.setOnEditorActionListener { _, _, _ ->
             if (::airaService.isInitialized){
                 airaService.connectTo(binding.editPeerIp.text.toString())

app/src/main/java/sushi/hardcore/aira/adapters/SessionAdapter.kt

@@ -31,14 +31,15 @@ class SessionAdapter(context: Context): BaseAdapter() {
         val view: View = convertView ?: inflater.inflate(R.layout.adapter_session, parent, false)
         val currentSession = getItem(position)
         view.findViewById<TextView>(R.id.text_name).apply {
-            if (currentSession.name == null) {
+            view.findViewById<TextAvatar>(R.id.text_avatar).setLetterFrom(if (currentSession.name == null) {
                 text = currentSession.ip
                 setTextColor(Color.RED)
+                "?"
             } else {
                 text = currentSession.name
                 setTextColor(Color.WHITE)
-            }
+                currentSession.name!!
-            view.findViewById<TextAvatar>(R.id.text_avatar).setLetterFrom(text.toString())
+            })
         }
         view.findViewById<ImageView>(R.id.image_trust_level).apply {
             if (currentSession.isVerified) {

app/src/main/java/sushi/hardcore/aira/background_service/AIRAService.kt

@@ -610,42 +610,42 @@ class AIRAService : Service() {
                                                 }
                                                 Protocol.ASK_LARGE_FILE -> {
                                                     if (receiveFileTransfers[sessionId] == null) {
-                                                        val fileSize = ByteBuffer.wrap(buffer.sliceArray(1..8)).long
+                                                        Protocol.parseAskFile(buffer)?.let { fileInfo ->
-                                                        val fileName = buffer.sliceArray(9 until buffer.size).decodeToString()
+                                                            val fileTransfer = ReceiveFileTransfer(fileInfo.fileName, fileInfo.fileSize, { fileTransfer ->
-                                                        val fileTransfer = ReceiveFileTransfer(fileName, fileSize, { fileTransfer ->
+                                                                createFileTransferNotification(sessionId, fileTransfer)
-                                                            createFileTransferNotification(sessionId, fileTransfer)
+                                                                sendTo(sessionId, Protocol.acceptLargeFile())
-                                                            sendTo(sessionId, Protocol.acceptLargeFile())
+                                                            }, {
-                                                        }, {
+                                                                receiveFileTransfers.remove(sessionId)
-                                                            receiveFileTransfers.remove(sessionId)
+                                                                sendTo(sessionId, Protocol.abortFileTransfer())
-                                                            sendTo(sessionId, Protocol.abortFileTransfer())
+                                                                notificationManager.cancel(notificationIdManager.getFileTransferNotificationId(sessionId))
-                                                            notificationManager.cancel(notificationIdManager.getFileTransferNotificationId(sessionId))
+                                                            })
-                                                        })
+                                                            receiveFileTransfers[sessionId] = fileTransfer
-                                                        receiveFileTransfers[sessionId] = fileTransfer
+                                                            val name = getNameOf(sessionId)
-                                                        val name = getNameOf(sessionId)
+                                                            var shouldSendNotification = true
-                                                        var shouldSendNotification = true
+                                                            if (!isAppInBackground) {
-                                                        if (!isAppInBackground) {
+                                                                if (uiCallbacks?.onAskLargeFile(sessionId, name, fileTransfer) == true) {
-                                                            if (uiCallbacks?.onAskLargeFile(sessionId, name, fileTransfer) == true) {
+                                                                    shouldSendNotification = false
-                                                                shouldSendNotification = false
+                                                                }
+                                                            }
+                                                            if (shouldSendNotification) {
+                                                                val notificationBuilder = NotificationCompat.Builder(this, ASK_FILE_TRANSFER_NOTIFICATION_CHANNEL_ID)
+                                                                        .setCategory(NotificationCompat.CATEGORY_EVENT)
+                                                                        .setSmallIcon(R.drawable.ic_launcher)
+                                                                        .setContentTitle(getString(R.string.download_file_request))
+                                                                        .setContentText(getString(R.string.want_to_send_a_file, name, ": "+fileInfo.fileName))
+                                                                        .setOngoing(true) //not cancelable
+                                                                        .setContentIntent(
+                                                                                PendingIntent.getActivity(this, 0, Intent(this, ChatActivity::class.java).apply {
+                                                                                    putExtra("sessionId", sessionId)
+                                                                                    putExtra("sessionName", name)
+                                                                                }, 0)
+                                                                        )
+                                                                        .setDefaults(Notification.DEFAULT_ALL)
+                                                                        .apply {
+                                                                            priority = NotificationCompat.PRIORITY_HIGH
+                                                                        }
+                                                                notificationManager.notify(notificationIdManager.getFileTransferNotificationId(sessionId), notificationBuilder.build())
                                                             }
-                                                        }
-                                                        if (shouldSendNotification) {
-                                                            val notificationBuilder = NotificationCompat.Builder(this, ASK_FILE_TRANSFER_NOTIFICATION_CHANNEL_ID)
-                                                                    .setCategory(NotificationCompat.CATEGORY_EVENT)
-                                                                    .setSmallIcon(R.drawable.ic_launcher)
-                                                                    .setContentTitle(getString(R.string.download_file_request))
-                                                                    .setContentText(getString(R.string.want_to_send_a_file, name, ": $fileName"))
-                                                                    .setOngoing(true) //not cancelable
-                                                                    .setContentIntent(
-                                                                            PendingIntent.getActivity(this, 0, Intent(this, ChatActivity::class.java).apply {
-                                                                                putExtra("sessionId", sessionId)
-                                                                                putExtra("sessionName", name)
-                                                                            }, 0)
-                                                                    )
-                                                                    .setDefaults(Notification.DEFAULT_ALL)
-                                                                    .apply {
-                                                                        priority = NotificationCompat.PRIORITY_HIGH
-                                                                    }
-                                                            notificationManager.notify(notificationIdManager.getFileTransferNotificationId(sessionId), notificationBuilder.build())
                                                         }
                                                     }
                                                 }
@@ -653,13 +653,16 @@ class AIRAService : Service() {
                                                     when (buffer[0]){
                                                         Protocol.MESSAGE -> buffer
                                                         Protocol.FILE -> {
-                                                            val filenameLen = ByteBuffer.wrap(ByteArray(2) +buffer.sliceArray(1..2)).int
+                                                            val smallFile = Protocol.parseSmallFile(buffer)
-                                                            val filename = buffer.sliceArray(3 until 3+filenameLen)
+                                                            if (smallFile == null) {
-                                                            val rawFileUuid = AIRADatabase.storeFile(contacts[sessionId]?.uuid, buffer.sliceArray(3+filenameLen until buffer.size))
-                                                            if (rawFileUuid == null) {
                                                                 null
                                                             } else {
-                                                                byteArrayOf(Protocol.FILE)+rawFileUuid+filename
+                                                                val rawFileUuid = AIRADatabase.storeFile(contacts[sessionId]?.uuid, smallFile.fileContent)
+                                                                if (rawFileUuid == null) {
+                                                                    null
+                                                                } else {
+                                                                    byteArrayOf(Protocol.FILE)+rawFileUuid+smallFile.rawFileName
+                                                                }
                                                             }
                                                         }
                                                         else -> {

app/src/main/java/sushi/hardcore/aira/background_service/Protocol.kt

@@ -45,5 +45,30 @@ class Protocol {
         fun ackChunk(): ByteArray {
             return byteArrayOf(ACK_CHUNK)
         }
+
+        class SmallFile(val rawFileName: ByteArray, val fileContent: ByteArray)
+
+        fun parseSmallFile(buffer: ByteArray): SmallFile? {
+            if (buffer.size > 3) {
+                val filenameLen = ByteBuffer.wrap(ByteArray(2) +buffer.sliceArray(1..2)).int
+                if (buffer.size > 3+filenameLen) {
+                    val rawFileName = buffer.sliceArray(3 until 3+filenameLen)
+                    return SmallFile(rawFileName, buffer.sliceArray(3+filenameLen until buffer.size))
+                }
+            }
+            return null
+        }
+
+        class FileInfo(val fileName: String, val fileSize: Long)
+
+        fun parseAskFile(buffer: ByteArray): FileInfo? {
+            return if (buffer.size > 9) {
+                val fileSize = ByteBuffer.wrap(buffer.sliceArray(1..8)).long
+                val fileName = buffer.sliceArray(9 until buffer.size).decodeToString()
+                FileInfo(fileName, fileSize)
+            } else {
+                null
+            }
+        }
     }
 }

app/src/main/java/sushi/hardcore/aira/utils/FileUtils.kt

@@ -46,7 +46,7 @@ object FileUtils {
             }
         } else {
             @Suppress("Deprecation")
-            File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), datedFilename).outputStream()
+            File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), File(datedFilename).name).outputStream()
         }
     }
 }

app/src/main/java/sushi/hardcore/aira/utils/StringUtils.kt

@@ -1,5 +1,7 @@
 package sushi.hardcore.aira.utils
 
+import java.net.InetAddress
+
 object StringUtils {
     fun beautifyFingerprint(fingerprint: String): String {
         val newFingerprint = StringBuilder(fingerprint.length+7)
@@ -9,4 +11,14 @@ object StringUtils {
         newFingerprint.append(fingerprint.slice(fingerprint.length-4 until fingerprint.length))
         return newFingerprint.toString()
     }
+
+    fun getIpFromInetAddress(addr: InetAddress): String {
+        val rawIp = addr.hostAddress
+        val i = rawIp.lastIndexOf('%')
+        return if (i == -1) {
+            rawIp
+        } else {
+            rawIp.substring(0, i)
+        }
+    }
 }

app/src/main/java/sushi/hardcore/aira/widgets/TextAvatar.kt

@@ -33,6 +33,8 @@ class TextAvatar @JvmOverloads constructor(
     }
 
     fun setLetterFrom(name: String) {
-        view.findViewById<TextView>(R.id.text_letter).text = name[0].toUpperCase().toString()
+        if (name.isNotEmpty()) {
+            view.findViewById<TextView>(R.id.text_letter).text = name[0].toUpperCase().toString()
+        }
     }
 }

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

@@ -22,7 +22,7 @@
         <ListView
             android:id="@+id/online_sessions"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
+            android:layout_height="0dp"
             app:layout_constraintTop_toBottomOf="@id/text_online_sessions"/>
 
         <TextView
@@ -36,19 +36,46 @@
         <ListView
             android:id="@+id/offline_sessions"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
+            android:layout_height="0dp"
-            app:layout_constraintTop_toBottomOf="@id/text_offline_sessions"/>
+            app:layout_constraintTop_toBottomOf="@id/text_offline_sessions"
+            app:layout_constraintBottom_toTopOf="@+id/bottom_panel"/>
 
-        <EditText
+        <androidx.constraintlayout.widget.ConstraintLayout
-            android:id="@+id/edit_peer_ip"
+            android:id="@+id/bottom_panel"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:inputType="text"
+            android:orientation="horizontal"
-            android:maxLines="1"
+            android:layout_marginHorizontal="20dp"
-            android:imeOptions="actionGo"
+            app:layout_constraintBottom_toBottomOf="parent">
-            android:hint="@string/add_peer_ip"
+
-            android:layout_margin="30dp"
+            <EditText
-            app:layout_constraintBottom_toBottomOf="parent"/>
+                android:id="@+id/edit_peer_ip"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:inputType="text"
+                android:maxLines="1"
+                android:imeOptions="actionGo"
+                android:hint="@string/add_peer_ip"
+                android:layout_marginEnd="10dp"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintEnd_toStartOf="@id/button_show_ip"/>
+
+            <ImageButton
+                android:id="@+id/button_show_ip"
+                android:layout_width="30dp"
+                android:layout_height="30dp"
+                android:src="@drawable/ic_info"
+                android:scaleType="fitXY"
+                android:background="#00000000"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toEndOf="@id/edit_peer_ip"
+                app:layout_constraintEnd_toEndOf="parent"/>
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
     </androidx.constraintlayout.widget.ConstraintLayout>
 
 </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

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

@@ -1,9 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="vertical" android:layout_width="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingHorizontal="20dp">
 
+    <sushi.hardcore.aira.widgets.TextAvatar
+        android:id="@+id/text_avatar"
+        android:layout_width="100dp"
+        android:layout_height="100dp"
+        app:textSize="20sp"
+        android:layout_gravity="center_horizontal"/>
+
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"

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

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/your_addresses"
+        style="@style/Label"/>
+
+    <TextView
+        android:id="@+id/text_ip_addresses"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textAlignment="center"/>
+
+</LinearLayout>

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

@@ -70,4 +70,5 @@
     <string name="add_contact">Add contact</string>
     <string name="remove_contact">Remove contact</string>
     <string name="details">Details</string>
+    <string name="your_addresses">Your IP addresses:</string>
 </resources>

build.gradle

@@ -1,6 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = "1.4.21"
+    ext.kotlin_version = "1.4.32"
     repositories {
         google()
         jcenter()