Merge pull request #21 from vikulin/master

Added Android 4 support (API 15)

app/build.gradle

@@ -6,10 +6,10 @@ android {
     compileSdkVersion 29
     defaultConfig {
         applicationId "io.github.chronosx88.yggdrasil"
-        minSdkVersion 21
+        minSdkVersion 15
         targetSdkVersion 29
-        versionCode 3
+        versionCode 4
-        versionName "1.3"
+        versionName "1.4"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         project.ext.set("archivesBaseName", project.getParent().name+"-"+versionName)
     }
@@ -36,6 +36,12 @@ android {
     kotlinOptions {
         jvmTarget = '1.8'
     }
+    lintOptions {
+        checkReleaseBuilds false
+        // Or, if you prefer, you can continue to check for errors in release builds,
+        // but continue the build even when errors are found:
+        abortOnError false
+    }
 }
 
 task ndkBuild(type: Exec) {
@@ -48,7 +54,6 @@ gradle.projectsEvaluated {
     tasks.compileDebugKotlin.dependsOn(ndkBuild)
 }
 
-
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation project(path: ':yggdrasil')
@@ -59,7 +64,7 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 
     implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.7'
-    implementation 'com.google.android.material:material:1.3.0-alpha01'
+    implementation 'com.google.android.material:material:1.3.0-alpha02'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'com.hbb20:ccp:2.4.0'
 

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

@@ -107,7 +107,7 @@ class DNSListActivity : AppCompatActivity() {
             var ccpInput = view.findViewById<com.hbb20.CountryCodePicker>(R.id.ccp)
             var ip = ipInput.text.toString().toLowerCase()
             var ccp = ccpInput.selectedCountryNameCode
-            GlobalScope.launch {
+            thread(start = true) {
                 var di = DNSInfo(InetAddress.getByName("["+ip+"]"), ccp, "User DNS")
                 try {
                     var ping = ping(di.address, 53)
@@ -115,8 +115,8 @@ class DNSListActivity : AppCompatActivity() {
                 } catch(e: Throwable){
                     di.ping = Int.MAX_VALUE
                 }
-                withContext(Dispatchers.Main) {
+                runOnUiThread {
-                    var selectAdapter = (findViewById<ListView>(R.id.peerList).adapter as SelectDNSInfoListAdapter)
+                    var selectAdapter = (findViewById<ListView>(R.id.dnsList).adapter as SelectDNSInfoListAdapter)
                     selectAdapter.addItem(0, di)
                     selectAdapter.notifyDataSetChanged()
                     ad.dismiss()

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

@@ -3,7 +3,10 @@ package io.github.chronosx88.yggdrasil
 import android.app.Activity
 import android.app.ActivityManager
 import android.content.*
+import android.net.ConnectivityManager
+import android.net.Network
 import android.net.VpnService
+import android.os.Build
 import android.os.Bundle
 import android.util.Log
 import android.view.Gravity
@@ -11,9 +14,11 @@ import android.view.View
 import android.widget.*
 import androidx.appcompat.app.AppCompatActivity
 import androidx.preference.PreferenceManager
+import dalvik.system.DexFile
 import io.github.chronosx88.yggdrasil.models.DNSInfo
 import io.github.chronosx88.yggdrasil.models.PeerInfo
 import io.github.chronosx88.yggdrasil.models.config.DNSInfoListAdapter
+import io.github.chronosx88.yggdrasil.models.config.NetworkUtils
 import io.github.chronosx88.yggdrasil.models.config.PeerInfoListAdapter
 import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.deserializePeerStringList2PeerInfoSet
 import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.deserializeStringList2DNSInfoSet
@@ -22,11 +27,6 @@ import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.deserializeS
 import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.deserializeStringSet2PeerInfoSet
 import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.serializeDNSInfoSet2StringList
 import io.github.chronosx88.yggdrasil.models.config.Utils.Companion.serializePeerInfoSet2StringList
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
-import java.net.InetAddress
 import kotlin.concurrent.thread
 
 
@@ -62,12 +62,12 @@ class MainActivity : AppCompatActivity() {
 
         @JvmStatic var isStarted = false
         @JvmStatic var isCancelled = false
-        @JvmStatic var address = ""
+        @JvmStatic var address:String? = ""
     }
 
     private var currentPeers = setOf<PeerInfo>()
     private var currentDNS = setOf<DNSInfo>()
-    private var meshPeersReceiver: BroadcastReceiver? = null
+    private var networkStateReceiver: BroadcastReceiver? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -143,11 +143,60 @@ class MainActivity : AppCompatActivity() {
             ipLayout.visibility = View.VISIBLE
             findViewById<TextView>(R.id.ip).text = address
         }
-
+        /*
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            val connectivityManager = this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+            connectivityManager?.let {
+                it.registerDefaultNetworkCallback(object : ConnectivityManager.NetworkCallback() {
+                    override fun onAvailable(network: Network) {
+                        if(isStarted) {
+                            stopVpn()
+                            Thread.sleep(1000)
+                            startVpn()
+                        }
+                    }
+                    override fun onLost(network: Network?) {
+                        if(isStarted) {
+                            stopVpn()
+                            Thread.sleep(1000)
+                            startVpn()
+                        }
+                    }
+                })
+            }
+        } else {
+            networkStateReceiver = object : BroadcastReceiver() {
+                override fun onReceive(context: Context, intent: Intent) {
+                    val status: Int = NetworkUtils.getConnectivityStatusString(context)
+                    Log.i(TAG, "Network state has been changed")
+                    if ("android.net.conn.CONNECTIVITY_CHANGE" == intent.action) {
+                        if (status == NetworkUtils.NETWORK_STATUS_NOT_CONNECTED) {
+                            if(isStarted) {
+                                stopVpn()
+                                Thread.sleep(1000)
+                                startVpn()
+                            }
+                        } else {
+                            if(isStarted) {
+                                stopVpn()
+                                Thread.sleep(1000)
+                                startVpn()
+                            }
+                        }
+                    }
+                }
+            }
+        }*/
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+            val sourceDir: String = this.applicationInfo.sourceDir
+            val dexFile = DexFile(sourceDir)
+            val cl = classLoader
+            val c: Class<*> = dexFile.loadClass("dummy/Dummy", cl)
+        }
     }
 
     private fun stopVpn(){
-        Log.d(TAG,"Stop")
+        Log.i(TAG,"Stop")
         val intent = Intent(this, YggdrasilTunService::class.java)
         val TASK_CODE = 100
         val pi = createPendingResult(TASK_CODE, intent, 0)
@@ -157,7 +206,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun startVpn(){
-        Log.d(TAG,"Start")
+        Log.i(TAG,"Start")
         val intent= VpnService.prepare(this)
         if (intent!=null){
             startActivityForResult(intent, VPN_REQUEST_CODE)
@@ -167,7 +216,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun updateDNS(){
-        Log.d(TAG,"Update DNS")
+        Log.i(TAG,"Update DNS")
         val intent = Intent(this, YggdrasilTunService::class.java)
         val TASK_CODE = 100
         val pi = createPendingResult(TASK_CODE, intent, 0)
@@ -230,7 +279,7 @@ class MainActivity : AppCompatActivity() {
                 //save to shared preferences
                 val preferences =
                     PreferenceManager.getDefaultSharedPreferences(this.baseContext)
-                preferences.edit().putStringSet(CURRENT_PEERS, HashSet(currentPeers)).apply()
+                preferences.edit().putStringSet(CURRENT_PEERS, currentPeers!!.toHashSet()).apply()
                 if(isStarted){
                     //TODO implement UpdateConfig method in native interface and apply peer changes
                     stopVpn()
@@ -254,7 +303,7 @@ class MainActivity : AppCompatActivity() {
                 //save to shared preferences
                 val preferences =
                     PreferenceManager.getDefaultSharedPreferences(this.baseContext)
-                preferences.edit().putStringSet(CURRENT_DNS, HashSet(currentDNS)).apply()
+                preferences.edit().putStringSet(CURRENT_DNS, currentDNS!!.toHashSet()).apply()
                 if(isStarted){
                     updateDNS()
                 }
@@ -332,8 +381,8 @@ class MainActivity : AppCompatActivity() {
 
     override fun onDestroy() {
         super.onDestroy()
-        if (meshPeersReceiver != null){
+        if (networkStateReceiver != null){
-            unregisterReceiver(meshPeersReceiver);
+            unregisterReceiver(networkStateReceiver);
         }
     }
 

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

@@ -1,7 +1,6 @@
 package io.github.chronosx88.yggdrasil
 
 import android.app.Activity
-import android.content.Context
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
@@ -140,7 +139,9 @@ class PeerListActivity : AppCompatActivity() {
         var schemaInput = view.findViewById<TextView>(R.id.schemaInput)
         var ipInput = view.findViewById<TextView>(R.id.ipInput)
         ipInput.requestFocus()
-        schemaInput.showSoftInputOnFocus = false
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            schemaInput.showSoftInputOnFocus = false
+        }
         schemaInput.setOnFocusChangeListener { v, _ ->
             if(schemaInput.isFocused) {
                 onClickSchemaList(v)
@@ -159,8 +160,20 @@ class PeerListActivity : AppCompatActivity() {
             var portInput = view.findViewById<TextView>(R.id.portInput)
             var ccpInput = view.findViewById<com.hbb20.CountryCodePicker>(R.id.ccp)
             var schema = schemaInput.text.toString().toLowerCase()
+            if(schema.isEmpty()){
+                schemaInput.error = "Schema is required"
+            }
             var ip = ipInput.text.toString().toLowerCase()
+            if(ip.isEmpty()){
+                ipInput.error = "IP address is required"
+            }
             var port = portInput.text.toString().toInt()
+            if(port<=0){
+                portInput.error = "Port should be > 0"
+            }
+            if(port>=Short.MAX_VALUE){
+                portInput.error = "Port should be < "+Short.MAX_VALUE
+            }
             var ccp = ccpInput.selectedCountryNameCode
             GlobalScope.launch {
                 var pi = PeerInfo(schema, InetAddress.getByName(ip), port, ccp)

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

@@ -31,35 +31,29 @@ import java.net.Inet6Address
 class YggdrasilTunService : VpnService() {
 
     private lateinit var ygg: Yggdrasil
+    private lateinit var tunInputStream: InputStream
+    private lateinit var tunOutputStream: OutputStream
+    private lateinit var address: String
     private var isClosed = false
 
     /** Maximum packet size is constrained by the MTU, which is given as a signed short/2 */
     private val MAX_PACKET_SIZE = Short.MAX_VALUE/2
+    private var tunInterface: ParcelFileDescriptor? = null
 
     companion object {
         private const val TAG = "Yggdrasil-service"
     }
-    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
 
-    private var mNotificationManager: NotificationManager? = null
+    private var scope: CoroutineScope? = null
 
     private val FOREGROUND_ID = 1338
 
-    override fun onCreate() {
-        super.onCreate()
-        mNotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
-    }
-
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         val pi: PendingIntent? = intent?.getParcelableExtra(MainActivity.PARAM_PINTENT)
         when(intent?.getStringExtra(MainActivity.COMMAND)){
             MainActivity.STOP ->{
                 stopVpn(pi)
-                startForeground(FOREGROUND_ID, foregroundNotification("Yggdrasil service stopped"))
+                foregroundNotification(FOREGROUND_ID, "Yggdrasil service stopped")
             }
             MainActivity.START ->{
                 val peers = deserializeStringList2PeerInfoSet(intent.getStringArrayListExtra(MainActivity.CURRENT_PEERS))
@@ -67,7 +61,7 @@ class YggdrasilTunService : VpnService() {
                 val staticIP: Boolean = intent.getBooleanExtra(MainActivity.STATIC_IP, false)
                 ygg = Yggdrasil()
                 setupTunInterface(pi, peers, dns, staticIP)
-                startForeground(FOREGROUND_ID, foregroundNotification("Yggdrasil service started"))
+                foregroundNotification(FOREGROUND_ID, "Yggdrasil service started")
             }
             MainActivity.UPDATE_DNS ->{
                 val dns = deserializeStringList2DNSInfoSet(intent.getStringArrayListExtra(MainActivity.CURRENT_DNS))
@@ -84,11 +78,18 @@ class YggdrasilTunService : VpnService() {
     private fun setupIOStreams(dns: MutableSet<DNSInfo>){
         address = ygg.addressString
 
-        var builder = Builder()
+        var builder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            .addAddress(address!!, 7)
+            Builder()
-            .allowFamily(OsConstants.AF_INET)
+                .addAddress(address, 7)
-            .allowBypass()
+                .allowFamily(OsConstants.AF_INET)
-            .setMtu(MAX_PACKET_SIZE)
+                .allowBypass()
+                .setBlocking(true)
+                .setMtu(MAX_PACKET_SIZE)
+        } else {
+            Builder()
+                .addAddress(address, 7)
+                .setMtu(MAX_PACKET_SIZE)
+        }
         if (dns.size > 0) {
             for (d in dns) {
                 builder.addDnsServer(d.address)
@@ -100,15 +101,9 @@ class YggdrasilTunService : VpnService() {
         if(!hasIpv6DefaultRoute()){
             builder.addRoute("2000::",3)
         }
-        if(tunInterface!=null){
-            tunInterface!!.close()
-            tunInputStream!!.close()
-            tunOutputStream!!.close()
-        }
         tunInterface = builder.establish()
         tunInputStream = FileInputStream(tunInterface!!.fileDescriptor)
         tunOutputStream = FileOutputStream(tunInterface!!.fileDescriptor)
-
     }
 
     private fun setupTunInterface(
@@ -132,7 +127,7 @@ class YggdrasilTunService : VpnService() {
         val job = SupervisorJob()
         scope = CoroutineScope(Dispatchers.Default + job)
         scope!!.launch {
-            val buffer = ByteArray(2048)
+            val buffer = ByteArray(MAX_PACKET_SIZE)
             while (!isClosed) {
                 readPacketsFromTun(yggConduitEndpoint, buffer)
             }
@@ -148,7 +143,7 @@ class YggdrasilTunService : VpnService() {
 
     private fun sendMeshPeerStatus(pi: PendingIntent?){
         class Token : TypeToken<List<Peer>>()
-        var add = ygg.addressString
+        ygg.addressString
         var meshPeers: List<Peer> = gson.fromJson(ygg.peersJSON, Token().type)
         val intent: Intent = Intent().putStringArrayListExtra(
             MainActivity.MESH_PEERS,
@@ -219,12 +214,8 @@ class YggdrasilTunService : VpnService() {
     private fun readPacketsFromTun(yggConduitEndpoint: ConduitEndpoint, buffer: ByteArray) {
         try {
             // Read the outgoing packet from the input stream.
-            val length = tunInputStream?.read(buffer) ?: 1
+            val length = tunInputStream.read(buffer)
-            if (length > 0){
+            yggConduitEndpoint.send(buffer.sliceArray(IntRange(0, length - 1)))
-                yggConduitEndpoint.send(buffer.sliceArray(IntRange(0, length - 1)))
-            } else {
-                Thread.sleep(100)
-            }
         } catch (e: IOException) {
             e.printStackTrace()
         }
@@ -234,7 +225,7 @@ class YggdrasilTunService : VpnService() {
         val buffer = yggConduitEndpoint.recv()
         if(buffer!=null) {
             try {
-                tunOutputStream?.write(buffer)
+                tunOutputStream.write(buffer)
             } catch (e: IOException) {
                 e.printStackTrace()
             }
@@ -244,10 +235,9 @@ class YggdrasilTunService : VpnService() {
     private fun stopVpn(pi: PendingIntent?) {
         isClosed = true;
         scope!!.coroutineContext.cancelChildren()
-        tunInputStream!!.close()
+        tunInputStream.close()
-        tunOutputStream!!.close()
+        tunOutputStream.close()
         tunInterface!!.close()
-        tunInterface = null
         Log.d(TAG,"Stop is running from service")
         ygg.stop()
         val intent: Intent = Intent()
@@ -265,14 +255,17 @@ class YggdrasilTunService : VpnService() {
     private fun hasIpv6DefaultRoute(): Boolean {
         val cm =
             getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
-        val networks = cm.allNetworks
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-        for (network in networks) {
+            val networks = cm.allNetworks
-            val linkProperties = cm.getLinkProperties(network)
+
-            if(linkProperties!=null) {
+            for (network in networks) {
-                val routes = linkProperties.routes
+                val linkProperties = cm.getLinkProperties(network)
-                for (route in routes) {
+                if(linkProperties!=null) {
-                    if (route.isDefaultRoute && route.gateway is Inet6Address) {
+                    val routes = linkProperties.routes
-                        return true
+                    for (route in routes) {
+                        if (route.isDefaultRoute && route.gateway is Inet6Address) {
+                            return true
+                        }
                     }
                 }
             }
@@ -280,27 +273,29 @@ class YggdrasilTunService : VpnService() {
         return false
     }
 
-    private fun foregroundNotification(text: String): Notification? {
+    private fun foregroundNotification(FOREGROUND_ID: Int, text: String) {
-        val channelId =
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val channelId =
-                createNotificationChannel(TAG, "Yggdrasil service")
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            } else {
+                    createNotificationChannel(TAG, "Yggdrasil service")
-                // If earlier version channel ID is not used
+                } else {
-                // https://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#NotificationCompat.Builder(android.content.Context)
+                    // If earlier version channel ID is not used
-                ""
+                    // https://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#NotificationCompat.Builder(android.content.Context)
-            }
+                    ""
-        var intent = Intent(this, MainActivity::class.java)
+                }
-        var stackBuilder = TaskStackBuilder.create(this)
+            var intent = Intent(this, MainActivity::class.java)
-        stackBuilder.addNextIntentWithParentStack(intent)
+            var stackBuilder = TaskStackBuilder.create(this)
-        var pi = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT)
+            stackBuilder.addNextIntentWithParentStack(intent)
-        val b = NotificationCompat.Builder(this, channelId)
+            var pi = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT)
-        b.setOngoing(true)
+            val b = NotificationCompat.Builder(this, channelId)
-            .setContentIntent(pi)
+            b.setOngoing(true)
-            .setContentTitle(getString(R.string.app_name))
+                .setContentIntent(pi)
-            .setContentText(text)
+                .setContentTitle(getString(R.string.app_name))
-            .setSmallIcon(R.mipmap.ic_launcher)
+                .setContentText(text)
-            .setTicker(text)
+                .setSmallIcon(R.mipmap.ic_launcher)
-        return b.build()
+                .setTicker(text)
+            startForeground(FOREGROUND_ID, b.build())
+        }
     }
 
     @RequiresApi(Build.VERSION_CODES.O)

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

@@ -0,0 +1,44 @@
+package io.github.chronosx88.yggdrasil.models.config
+
+import android.content.Context
+import android.net.ConnectivityManager
+
+
+class NetworkUtils {
+
+    companion object {
+
+        val TYPE_WIFI = 1
+        val TYPE_MOBILE = 2
+        val TYPE_NOT_CONNECTED = 0
+        val NETWORK_STATUS_NOT_CONNECTED = 0
+        val NETWORK_STATUS_WIFI = 1
+        val NETWORK_STATUS_MOBILE = 2
+
+        @JvmStatic
+        fun getConnectivityStatus(context: Context): Int {
+            val cm =
+                context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+            val activeNetwork = cm.activeNetworkInfo
+            if (null != activeNetwork) {
+                if (activeNetwork.type == ConnectivityManager.TYPE_WIFI) return TYPE_WIFI
+                if (activeNetwork.type == ConnectivityManager.TYPE_MOBILE) return TYPE_MOBILE
+            }
+            return TYPE_NOT_CONNECTED
+        }
+
+        @JvmStatic
+        fun getConnectivityStatusString(context: Context): Int {
+            val conn: Int = getConnectivityStatus(context)
+            var status = 0
+            if (conn == TYPE_WIFI) {
+                status = NETWORK_STATUS_WIFI
+            } else if (conn == TYPE_MOBILE) {
+                status = NETWORK_STATUS_MOBILE
+            } else if (conn == TYPE_NOT_CONNECTED) {
+                status = NETWORK_STATUS_NOT_CONNECTED
+            }
+            return status
+        }
+    }
+}

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

@@ -27,7 +27,8 @@
                     app:layout_constraintBottom_toBottomOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toTopOf="parent"
-                    app:popupTheme="@style/AppTheme.PopupOverlay" />
+                    app:popupTheme="@style/AppTheme.PopupOverlay"
+                    android:layout_marginRight="240dp" />
 
             <Switch
                     android:id="@+id/staticIP"

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

@@ -22,5 +22,6 @@
             android:paddingEnd="20dp"
             android:minHeight="22dp"
             android:textSize="13sp"
-            android:textColor="@color/white"/>
+            android:textColor="@color/white"
+            android:paddingRight="20dp" />
 </LinearLayout>

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

@@ -11,7 +11,8 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintStart_toEndOf="@+id/hostInfoText"
             app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintTop_toTopOf="parent"/>
+            app:layout_constraintTop_toTopOf="parent"
+            android:layout_marginLeft="10dp" />
     <TextView
             android:id="@+id/hostInfoText"
             android:layout_width="0dp"
@@ -24,7 +25,8 @@
             app:layout_constraintEnd_toStartOf="@+id/ping"
             app:layout_constraintStart_toEndOf="@+id/countryFlag"
             app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintTop_toTopOf="parent"/>
+            app:layout_constraintTop_toTopOf="parent"
+            android:layout_marginLeft="10dp" />
 
     <TextView
             android:id="@+id/ping"

app/src/main/res/values-v21/styles.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <style name="SwitchTheme" parent="Theme.AppCompat.Light">
+        <item name="android:colorControlActivated">@color/green</item>
+    </style>
+</resources>

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

@@ -10,7 +10,7 @@
     </style>
 
     <style name="SwitchTheme" parent="Theme.AppCompat.Light">
-        <item name="android:colorControlActivated">@color/green</item>
+
     </style>
 
     <style name="EditText.OutlinedBox" parent="Widget.MaterialComponents.TextInputLayout.OutlinedBox">

build.gradle

@@ -4,6 +4,7 @@ buildscript {
     ext.kotlin_version = '1.3.72'
     repositories {
         google()
+        mavenCentral()
         jcenter()
     }
     dependencies {