Creation of MVVM components:

- UI
- MainViewModel/MainViewModelFactory
- Repository/RepositoryImpl
- Data sources
    - Websocket networking with scarlet
    - Room Database

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+apply plugin: 'kotlin-kapt'
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "29.0.3"
+
+    defaultConfig {
+        applicationId "com.example.h_mal.messengerapp"
+        minSdkVersion 23
+        targetSdkVersion 30
+        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"
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.core:core-ktx:1.3.1'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+
+
+    // Networking
+    def scarlet_version = '0.1.9'
+    implementation "com.tinder.scarlet:scarlet:${scarlet_version}"
+    implementation "com.tinder.scarlet:websocket-okhttp:${scarlet_version}"
+    implementation "com.tinder.scarlet:message-adapter-gson:${scarlet_version}"
+    implementation "com.tinder.scarlet:stream-adapter-coroutines:${scarlet_version}"
+    implementation "com.tinder.scarlet:lifecycle-android:${scarlet_version}"
+    def okhttp3_version = '4.9.0'
+    implementation "com.squareup.okhttp3:okhttp:${okhttp3_version}"
+    implementation "com.squareup.okhttp3:logging-interceptor:${okhttp3_version}"
+    implementation "com.google.code.gson:gson:2.8.6"
+    // Kodein Dependency Injection
+    implementation "org.kodein.di:kodein-di-generic-jvm:6.2.1"
+    implementation "org.kodein.di:kodein-di-framework-android-x:6.2.1"
+    // Room database
+    def room_version = "2.2.5"
+    implementation "androidx.room:room-runtime:$room_version"
+    kapt "androidx.room:room-compiler:$room_version"
+    implementation "androidx.room:room-ktx:$room_version"
+}

app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# 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

app/src/androidTest/java/com/example/h_mal/messengerapp/ExampleInstrumentedTest.kt

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+package com.example.h_mal.messengerapp
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.h_mal.messengerapp", appContext.packageName)
+    }
+}

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"
+    package="com.example.h_mal.messengerapp">
+
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:name=".application.AppClass"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:usesCleartextTraffic="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/example/h_mal/messengerapp/MainActivity.kt

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+package com.example.h_mal.messengerapp
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import com.example.h_mal.messengerapp.ui.main.MainFragment
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.main_activity)
+        if (savedInstanceState == null) {
+            supportFragmentManager.beginTransaction()
+                    .replace(R.id.container, MainFragment.newInstance())
+                    .commitNow()
+        }
+    }
+}

app/src/main/java/com/example/h_mal/messengerapp/application/AppClass.kt

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+package com.example.h_mal.messengerapp.application
+
+import android.app.Application
+import com.example.h_mal.messengerapp.data.network.MessengerApi
+import com.example.h_mal.messengerapp.data.network.NetworkConnectionInterceptor
+import com.example.h_mal.messengerapp.data.network.okHttpClient
+import com.example.h_mal.messengerapp.data.repository.RepositoryImpl
+import com.example.h_mal.messengerapp.data.room.AppRoomDatabase
+import com.example.h_mal.messengerapp.ui.main.MainViewModelFactory
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import org.kodein.di.Kodein
+import org.kodein.di.KodeinAware
+import org.kodein.di.android.x.androidXModule
+import org.kodein.di.generic.bind
+import org.kodein.di.generic.instance
+import org.kodein.di.generic.provider
+import org.kodein.di.generic.singleton
+
+class AppClass: Application(), KodeinAware{
+
+    // Kodein aware to initialise the classes used for DI
+    @ExperimentalCoroutinesApi
+    override val kodein = Kodein.lazy {
+        import(androidXModule(this@AppClass))
+
+        bind() from singleton {
+            NetworkConnectionInterceptor(
+                instance()
+            )
+        }
+        bind() from singleton {
+            okHttpClient(
+                instance()
+            )
+        }
+        bind() from singleton {
+            MessengerApi(
+                instance()
+            )
+        }
+        bind() from singleton { AppRoomDatabase(instance()) }
+        bind() from singleton { RepositoryImpl(instance()) }
+        bind() from provider { MainViewModelFactory(instance()) }
+    }
+}

app/src/main/java/com/example/h_mal/messengerapp/data/network/MessengerApi.kt

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+package com.example.h_mal.messengerapp.data.network
+
+import com.tinder.scarlet.Scarlet
+import com.tinder.scarlet.Stream
+import com.tinder.scarlet.WebSocket
+import com.tinder.scarlet.messageadapter.gson.GsonMessageAdapter
+import com.tinder.scarlet.websocket.okhttp.newWebSocketFactory
+import com.tinder.scarlet.ws.Receive
+import com.tinder.scarlet.ws.Send
+import com.tinder.streamadapter.coroutines.CoroutinesStreamAdapterFactory
+import kotlinx.coroutines.channels.ReceiveChannel
+import okhttp3.OkHttpClient
+
+
+interface MessengerApi {
+
+    @Receive
+    fun observerMessage(): ReceiveChannel<String>
+
+    @Receive
+    fun observerFailure(): ReceiveChannel<WebSocket.Event.OnConnectionFailed>
+
+    @Send
+    fun send(message: Any): Boolean
+
+
+    // invoke method creating an invocation of the api call
+    companion object{
+        operator fun invoke(
+            okkHttpClient: OkHttpClient
+        ) : MessengerApi {
+
+            val webSocketUrl = "ws://echo.websocket.org/"
+
+            // creation of retrofit class
+            return Scarlet.Builder()
+                .webSocketFactory(okkHttpClient.newWebSocketFactory(webSocketUrl))
+                .addMessageAdapterFactory(GsonMessageAdapter.Factory())
+                .addStreamAdapterFactory(CoroutinesStreamAdapterFactory())
+                .build()
+                .create()
+
+        }
+    }
+}

app/src/main/java/com/example/h_mal/messengerapp/data/network/NetworkConnectionInterceptor.kt

@@ -0,0 +1,42 @@
+package com.example.h_mal.messengerapp.data.network
+
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
+import okhttp3.Interceptor
+import okhttp3.Response
+import java.io.IOException
+
+/**
+ * Network interceptor to verify valid network connection
+ * Throws an [IOException] if there no valid internet connection
+ */
+class NetworkConnectionInterceptor(
+    context: Context
+): Interceptor {
+    private val applicationContext = context.applicationContext
+
+    override fun intercept(chain: Interceptor.Chain): Response {
+        if (!isInternetAvailable()) {
+            throw IOException("Make sure you have an active data connection")
+        }
+
+        return chain.proceed(chain.request())
+    }
+
+    private fun isInternetAvailable(): Boolean {
+        var result = false
+        val connectivityManager =
+            applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
+        connectivityManager?.let {
+            it.getNetworkCapabilities(connectivityManager.activeNetwork)?.apply {
+                result = when {
+                    hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> true
+                    hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> true
+                    else -> false
+                }
+            }
+        }
+        return result
+    }
+}

app/src/main/java/com/example/h_mal/messengerapp/data/network/OkHttpClient.kt

@@ -0,0 +1,21 @@
+package com.example.h_mal.messengerapp.data.network
+
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import java.util.concurrent.TimeUnit
+
+fun okHttpClient(
+    networkInterceptor: NetworkConnectionInterceptor
+): OkHttpClient {
+    val logging: HttpLoggingInterceptor = HttpLoggingInterceptor().apply {
+        level = HttpLoggingInterceptor.Level.BODY
+    }
+
+    return OkHttpClient.Builder()
+        .addInterceptor(logging)
+        .addNetworkInterceptor(networkInterceptor)
+        .readTimeout(60, TimeUnit.SECONDS)
+        .writeTimeout(60, TimeUnit.SECONDS)
+        .connectTimeout(60, TimeUnit.SECONDS)
+        .build()
+}

app/src/main/java/com/example/h_mal/messengerapp/data/repository/Repository.kt

@@ -0,0 +1,11 @@
+package com.example.h_mal.messengerapp.data.repository
+
+import com.tinder.scarlet.WebSocket
+import kotlinx.coroutines.channels.ReceiveChannel
+
+interface Repository {
+
+    fun observeText(): ReceiveChannel<String>
+    fun submitMessage(message: String)
+    fun getEvent(): ReceiveChannel<WebSocket.Event>
+}

app/src/main/java/com/example/h_mal/messengerapp/data/repository/RepositoryImpl.kt

@@ -0,0 +1,29 @@
+package com.example.h_mal.messengerapp.data.repository
+
+import android.util.Log
+import com.example.h_mal.messengerapp.data.network.MessengerApi
+import com.tinder.scarlet.WebSocket
+import kotlinx.coroutines.channels.ReceiveChannel
+import kotlinx.coroutines.channels.consumeEach
+import java.io.IOException
+
+class RepositoryImpl(
+    private val messengerApi: MessengerApi
+) : Repository{
+
+    override fun observeText(): ReceiveChannel<String> {
+        return messengerApi.observerMessage()
+    }
+
+    override fun submitMessage(message: String){
+        val send = messengerApi.send(message)
+        if (!send){
+            throw IOException("Could not send message")
+        }
+    }
+
+    override fun getEvent(): ReceiveChannel<WebSocket.Event.OnConnectionFailed> {
+        return messengerApi.observerFailure()
+    }
+
+}

app/src/main/java/com/example/h_mal/messengerapp/data/room/MessageDao.kt

@@ -0,0 +1,26 @@
+package com.example.h_mal.messengerapp.data.room
+
+import androidx.lifecycle.LiveData
+import androidx.room.*
+
+@Dao
+interface MessageDao {
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    fun saveAllItems(messages : List<MessageEntity>)
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    fun saveSingleItem(message : MessageEntity)
+
+    @Query("SELECT * FROM MessageEntity")
+    fun getAllItems() : LiveData<List<MessageEntity>>
+
+    @Query("SELECT * FROM MessageEntity WHERE id = :id")
+    fun getItem(id: Int) : LiveData<MessageEntity>
+
+    @Query("DELETE FROM MessageEntity")
+    suspend fun deleteAllEntries()
+
+    @Delete
+    fun deleteSingleEntry(message: MessageEntity)
+}

app/src/main/java/com/example/h_mal/messengerapp/data/room/MessageEntity.kt

@@ -0,0 +1,12 @@
+package com.example.h_mal.messengerapp.data.room
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity
+data class MessageEntity(
+    @PrimaryKey(autoGenerate = true)
+    val id: Int,
+    val sender: Boolean,
+    val message: String
+)

app/src/main/java/com/example/h_mal/messengerapp/data/room/RoomDatabase.kt

@@ -0,0 +1,34 @@
+package com.example.h_mal.messengerapp.data.room
+
+import android.content.Context
+import androidx.room.*
+
+@Database(
+    entities = [MessageEntity::class],
+    version = 1
+)
+abstract class AppRoomDatabase : RoomDatabase() {
+
+    abstract fun getMessageDao(): MessageDao
+
+    companion object {
+
+        @Volatile
+        private var instance: AppRoomDatabase? = null
+        private val LOCK = Any()
+
+        // create an instance of room database or use previously created instance
+        operator fun invoke(context: Context) = instance ?: synchronized(LOCK) {
+            instance ?: buildDatabase(context).also {
+                instance = it
+            }
+        }
+
+        private fun buildDatabase(context: Context) =
+            Room.databaseBuilder(
+                context.applicationContext,
+                AppRoomDatabase::class.java,
+                "MyDatabase.db"
+            ).build()
+    }
+}

app/src/main/java/com/example/h_mal/messengerapp/ui/main/MainFragment.kt

@@ -0,0 +1,49 @@
+package com.example.h_mal.messengerapp.ui.main
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.lifecycle.ViewModelProvider
+import com.example.h_mal.messengerapp.R
+import kotlinx.android.synthetic.main.main_fragment.*
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.InternalCoroutinesApi
+import org.kodein.di.KodeinAware
+import org.kodein.di.android.x.kodein
+import org.kodein.di.generic.instance
+
+class MainFragment : Fragment(), KodeinAware {
+    override val kodein by kodein()
+    private val factory by instance<MainViewModelFactory>()
+
+    companion object {
+        fun newInstance() = MainFragment()
+    }
+
+
+    @InternalCoroutinesApi
+    @ExperimentalCoroutinesApi
+    private lateinit var viewModel: MainViewModel
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
+                              savedInstanceState: Bundle?): View {
+        return inflater.inflate(R.layout.main_fragment, container, false)
+    }
+
+    @InternalCoroutinesApi
+    @ExperimentalCoroutinesApi
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+
+
+        viewModel = ViewModelProvider(this, factory).get(MainViewModel::class.java)
+
+
+        message.setOnClickListener {
+            viewModel.submitMessage("dsfsdfsdjf")
+        }
+    }
+
+}

app/src/main/java/com/example/h_mal/messengerapp/ui/main/MainViewModel.kt

@@ -0,0 +1,32 @@
+package com.example.h_mal.messengerapp.ui.main
+
+import android.util.Log
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.h_mal.messengerapp.data.repository.Repository
+import com.tinder.scarlet.Stream
+import com.tinder.scarlet.WebSocket
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.InternalCoroutinesApi
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.launch
+
+
+@InternalCoroutinesApi
+@ExperimentalCoroutinesApi
+class MainViewModel(
+    private val repository: Repository
+) : ViewModel() {
+
+    init {
+        viewModelScope.launch {
+            repository.observeText().consumeEach {
+                Log.i("WebsocketOut", it)
+            }
+        }
+    }
+
+    fun submitMessage(message: String){
+        repository.submitMessage(message)
+    }
+}

app/src/main/java/com/example/h_mal/messengerapp/ui/main/MainViewModelFactory.kt

@@ -0,0 +1,27 @@
+package com.example.h_mal.messengerapp.ui.main
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import com.example.h_mal.messengerapp.data.repository.RepositoryImpl
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.InternalCoroutinesApi
+
+/**
+ * ViewModel provider factory to instantiate MainViewModel.
+ */
+class MainViewModelFactory(
+    private val repositoryImpl: RepositoryImpl
+) : ViewModelProvider.Factory {
+
+    @InternalCoroutinesApi
+    @ExperimentalCoroutinesApi
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(MainViewModel::class.java)) {
+            return (
+                    MainViewModel(repositoryImpl)
+                    ) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel class")
+    }
+}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

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

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity" />

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

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.main.MainFragment">
+
+    <TextView
+        android:id="@+id/message"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="MainFragment"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

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

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#6200EE</color>
+    <color name="colorPrimaryDark">#3700B3</color>
+    <color name="colorAccent">#03DAC5</color>
+</resources>

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

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">MessengerApp</string>
+</resources>

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

@@ -0,0 +1,10 @@
+<resources>
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>

app/src/test/java/com/example/h_mal/messengerapp/ExampleUnitTest.kt

@@ -0,0 +1,17 @@
+package com.example.h_mal.messengerapp
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}