here is a simple android application

androidApp/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

androidApp/app/.gitignore

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+/build
+.idea/

androidApp/app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    compileSdk 32
+    packagingOptions {
+        exclude 'META-INF/*'
+    }
+
+    defaultConfig {
+        applicationId "ru.svyat.ovf"
+        minSdk 16
+        targetSdk 32
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'com.google.android.material:material:1.5.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.0'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+}

androidApp/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

androidApp/app/src/main/AndroidManifest.xml

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+<?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="ru.svyat.ovf">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission
+        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        tools:ignore="ScopedStorage" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.OVFinder"
+        android:usesCleartextTraffic="true"
+        tools:targetApi="m">
+        <activity
+            android:name=".activity.OVFinder"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".activity.VpnLoad"
+            android:exported="true">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".activity.OVFinder" />
+        </activity>
+    </application>
+
+</manifest>

androidApp/app/src/main/java/ru/svyat/ovf/activity/OVFinder.kt

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+package ru.svyat.ovf.activity
+
+import android.content.Intent
+import android.os.Bundle
+import android.util.Log
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.floatingactionbutton.FloatingActionButton
+import ru.svyat.ovf.R
+import ru.svyat.ovf.services.getSavedConfigs
+import ru.svyat.ovf.ui.FileRVAdapter
+
+class OVFinder : AppCompatActivity(R.layout.init){
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        with(findViewById<RecyclerView>(R.id.file_list)){
+            adapter = FileRVAdapter(getSavedConfigs())
+            layoutManager = LinearLayoutManager(this@OVFinder)
+        }
+        findViewById<FloatingActionButton>(R.id.btn_get_vpns).setOnClickListener{
+            Log.i(null, "vpn updating gonna be started")
+            startActivity(Intent(this, VpnLoad::class.java))
+        }
+    }
+}

androidApp/app/src/main/java/ru/svyat/ovf/activity/VpnLoad.kt

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+package ru.svyat.ovf.activity
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import ru.svyat.ovf.R
+import ru.svyat.ovf.services.loadVpns
+import ru.svyat.ovf.ui.VpnRVAdapter
+
+class VpnLoad: AppCompatActivity(R.layout.vpns) {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val vpns = loadVpns()
+        with(findViewById<RecyclerView>(R.id.vpn_list)){
+            adapter = VpnRVAdapter(vpns)
+            layoutManager = LinearLayoutManager(this@VpnLoad)
+        }
+    }
+}

androidApp/app/src/main/java/ru/svyat/ovf/dto/VpnInfo.kt

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+@file:Suppress("MemberVisibilityCanBePrivate")
+
+package ru.svyat.ovf.dto
+
+import android.util.Base64
+
+data class VpnInfo(private val line: String) {
+    val name: String
+    val ip: String
+    val score: Int?
+    val ping: Int?
+    val speed: Long?
+    val countryName: String
+    val countryCode: String
+    val sessionsCount: Long?
+    val uptime: Long?
+    val usersCount: Long?
+    val totalTraffic: Long?
+    val logLevel: String
+    val operator: String
+    val message: String
+    val config: String
+
+    init {
+        val values = line.split(",")
+        name = values[0]
+        ip = values[1]
+        score = values[2].toIntOrNull()
+        ping = values[3].toIntOrNull()
+        speed = values[4].toLongOrNull()
+        countryName = values[5]
+        countryCode = values[6]
+        sessionsCount = values[7].toLongOrNull()
+        uptime = values[8].toLongOrNull()
+        usersCount = values[9].toLongOrNull()
+        totalTraffic = values[10].toLongOrNull()
+        logLevel = values[11]
+        operator = values[12]
+        message = values[13]
+        config = String(Base64.decode(values[14], Base64.DEFAULT))
+    }
+}

androidApp/app/src/main/java/ru/svyat/ovf/services/FileUtils.kt

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+package ru.svyat.ovf.services
+
+import android.os.Build.VERSION.SDK_INT
+import android.os.Build.VERSION_CODES.KITKAT
+import android.os.Environment.*
+import android.util.Log
+import java.io.File
+import java.io.FileWriter
+import java.util.concurrent.atomic.AtomicInteger
+
+const val EXTENSION = ".ovpn"
+const val DIR_NAME = "/OVFinder"
+
+val FILES_STORAGE =
+    if (SDK_INT >= KITKAT) "${getExternalStoragePublicDirectory(DIRECTORY_DOCUMENTS).absolutePath}$DIR_NAME"
+    else "${getExternalStorageDirectory().absolutePath}/Download/$DIR_NAME"
+
+fun getSavedConfigs(): List<File> = File(FILES_STORAGE).listFiles()?.asList() ?: emptyList()
+fun saveConfig(name: String, content: String) = createFile(name, content)
+fun deleteConfig(absPath: String){
+    val file = File(absPath)
+    file.delete()
+}
+
+private fun createFile(fileName: String, content: String): File {
+    createBaseDir()
+    var configFile = File("$FILES_STORAGE/$fileName$EXTENSION")
+    val counter = AtomicInteger()
+    while (configFile.exists()) {
+        configFile = File("$FILES_STORAGE/$fileName-${counter.incrementAndGet()}$EXTENSION")
+        Log.w("FILE", "${configFile.absolutePath} already exist, new file is")
+    }
+    configFile.createNewFile()
+    FileWriter(configFile).use { it.write(content) }
+    Log.i("FILE", configFile.absolutePath)
+    return configFile
+}
+private fun createBaseDir() {
+    val dir = File(FILES_STORAGE)
+    if (!dir.exists()) {
+        dir.mkdirs()
+        Log.i("FILE", "Created $FILES_STORAGE")
+    }
+}

androidApp/app/src/main/java/ru/svyat/ovf/services/SimpleWebClients.kt

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+package ru.svyat.ovf.services
+
+import android.util.Log
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.runBlocking
+import ru.svyat.ovf.dto.VpnInfo
+import java.io.InputStreamReader
+import java.net.HttpURLConnection
+import java.net.URL
+import java.util.*
+import java.util.concurrent.atomic.AtomicInteger
+
+const val URL = "http://www.vpngate.net/api/iphone/"
+
+fun loadVpns() = runBlocking(Dispatchers.IO) {
+    val start = Date()
+    val url = URL(URL)
+    Log.i("INTERNET", "$start start loading vpns from $URL")
+    (url.openConnection() as HttpURLConnection).run {
+        requestMethod = "GET"
+        doOutput = true
+        connectTimeout = 10000
+        val result = mutableListOf<VpnInfo>()
+        val counter = AtomicInteger()
+        inputStream.use {
+            InputStreamReader(it).forEachLine { line ->
+                if (counter.getAndIncrement() > 2 &&
+                    line != "*"
+                )
+                    result.add(VpnInfo(line))
+            }
+        }
+        Log.i("INTERNET", "downloaded in ${(Date().time - start.time)} seconds")
+        return@runBlocking result
+    }
+}

androidApp/app/src/main/java/ru/svyat/ovf/ui/FileRVAdapter.kt

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+package ru.svyat.ovf.ui
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import android.widget.TextView
+import android.widget.Toast
+import androidx.recyclerview.widget.RecyclerView
+import ru.svyat.ovf.R
+import ru.svyat.ovf.services.deleteConfig
+import java.io.File
+
+class FileRVAdapter(private val files: List<File>): RecyclerView.Adapter<FileRVAdapter.FileHolder>() {
+    inner class FileHolder(itemView: View): RecyclerView.ViewHolder(itemView){
+        init {
+            itemView.setOnClickListener{
+                Toast.makeText(itemView.context.applicationContext, "call connector app", Toast.LENGTH_LONG).show()
+            }
+            itemView.findViewById<Button>(R.id.btn_delete).setOnClickListener{
+                deleteConfig(files[adapterPosition].absolutePath)
+            }
+        }
+        val name: TextView = itemView.findViewById(R.id.txt_file_name)
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FileHolder =
+        FileHolder(LayoutInflater.from(parent.context)
+            .inflate(R.layout.file_item, parent, false))
+
+    override fun onBindViewHolder(holder: FileHolder, position: Int) {
+        holder.name.text = files[position].name
+    }
+
+    override fun getItemCount(): Int = files.size
+}

androidApp/app/src/main/java/ru/svyat/ovf/ui/VpnRVAdapter.kt

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+package ru.svyat.ovf.ui
+
+import android.graphics.Color
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import ru.svyat.ovf.R
+import ru.svyat.ovf.dto.VpnInfo
+import ru.svyat.ovf.services.saveConfig
+
+class VpnRVAdapter(private val vpns: List<VpnInfo>) :
+    RecyclerView.Adapter<VpnRVAdapter.VpnHolder>() {
+    inner class VpnHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        init {
+            itemView.setOnClickListener {
+                saveConfig(vpns[adapterPosition].name, vpns[adapterPosition].config)
+            }
+        }
+
+        private val ip: TextView = itemView.findViewById(R.id.txt_ip)
+        private val speed: TextView = itemView.findViewById(R.id.txt_speed)
+        private val ping: TextView = itemView.findViewById(R.id.txt_ping)
+        private val countryCode: TextView = itemView.findViewById(R.id.txt_country_code)
+        private val logLevel: TextView = itemView.findViewById(R.id.txt_log_level)
+
+        fun bind(vpn: VpnInfo) {
+            ip.text = vpn.ip
+            countryCode.text = vpn.countryCode
+            speed.text = vpn.speed?.let { "%.2fMB/s".format(it / (1024*1024F)) }?.toString() ?: "-"
+            ping.text = vpn.ping?.toString() ?: "-"
+            logLevel.text = vpn.logLevel
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VpnHolder =
+        VpnHolder(
+            LayoutInflater.from(parent.context)
+                .inflate(R.layout.vpn_item, parent, false)
+        )
+
+    override fun onBindViewHolder(holder: VpnHolder, position: Int) {
+        holder.bind(vpns[position])
+    }
+
+    override fun getItemCount(): Int = vpns.size
+}