app/build.gradle.kts

@@ -1,8 +1,5 @@
 plugins {
     id(Plugins.ANDROID_APP_PLUGIN_WITH_DEFAULT_CONFIG)
-    id(libs.plugins.android.application.get().pluginId)
-    id(libs.plugins.kotlin.android.get().pluginId)
-    id(libs.plugins.kotlin.kapt.get().pluginId)
     alias(libs.plugins.google.services)
     alias(libs.plugins.firebase.crashlytics)
     alias(libs.plugins.firebase.perf)
@@ -91,6 +88,9 @@ dependencies {
     // Groupie
     implementation(libs.groupie)
     implementation(libs.groupie.viewbinding)
+
+    // Cicecrone
+    implementation(libs.cicerone)
 }
 
 apply(from = "${rootProject.ext["buildScriptsDir"]}/gradle/scripts/stringGenerator.gradle")

app/src/main/AndroidManifest.xml

@@ -11,12 +11,12 @@
         android:label="@string/common_app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="false"
-        tools:ignore="GoogleAppIndexingWarning">
+        tools:ignore="GoogleAppIndexingWarning"
+        android:theme="@style/AppTheme">
 
         <activity
-            android:name="ru.touchin.template.SingleActivity"
+            android:name=".feature.SingleActivity"
             android:screenOrientation="portrait"
-            android:theme="@style/AppTheme"
             android:windowSoftInputMode="adjustResize"
             android:exported="true">
             <intent-filter>

app/src/main/java/ru/touchin/template/App.kt

@@ -1,5 +1,18 @@
 package ru.touchin.template
 
 import android.app.Application
+import ru.touchin.template.di.DI
+import ru.touchin.template.di.SharedComponent
+import ru.touchin.template.di.SharedComponentProvider
 
-class App : Application()
+class App : Application(), SharedComponentProvider {
+
+    override fun onCreate() {
+        super.onCreate()
+
+        DI.init(applicationContext)
+        DI.getComponent().inject(this)
+    }
+
+    override fun getModule(): SharedComponent = DI.getComponent()
+}

app/src/main/java/ru/touchin/template/SingleActivity.kt

@@ -1,5 +0,0 @@
-package ru.touchin.template
-
-import androidx.appcompat.app.AppCompatActivity
-
-class SingleActivity : AppCompatActivity()

app/src/main/java/ru/touchin/template/base/activity/BaseActivity.kt

@@ -0,0 +1,17 @@
+package ru.touchin.template.base.activity
+
+import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.ViewModel
+import ru.touchin.template.di.SharedComponent
+import ru.touchin.template.di.getSharedModule
+
+abstract class BaseActivity<T : ViewModel> : AppCompatActivity() {
+
+    protected val viewModel: T by lazy { createViewModelLazy().value }
+
+    protected val viewModelFactory by lazy { getSharedComponent().viewModelFactory() }
+
+    abstract fun createViewModelLazy(): Lazy<T>
+
+    protected fun getSharedComponent(): SharedComponent = getSharedModule()
+}

app/src/main/java/ru/touchin/template/base/fragment/BaseFragment.kt

@@ -0,0 +1,23 @@
+package ru.touchin.template.base.fragment
+
+import androidx.annotation.LayoutRes
+import androidx.fragment.app.Fragment
+import ru.touchin.template.base.viewmodel.BaseViewModel
+import ru.touchin.template.di.SharedComponent
+import ru.touchin.template.di.getSharedModule
+import ru.touchin.template.navigation.backpress.OnBackPressedListener
+
+abstract class BaseFragment<T : BaseViewModel>(@LayoutRes layoutId: Int) : Fragment(layoutId), OnBackPressedListener {
+
+    protected val viewModel: T by lazy { createViewModelLazy().value }
+
+    protected val viewModelFactory by lazy { getSharedComponent().viewModelFactory() }
+
+    protected abstract fun createViewModelLazy(): Lazy<T>
+
+    protected fun getSharedComponent(): SharedComponent = getSharedModule()
+
+    override fun onBackPressed(): Boolean {
+        return viewModel.onBackClicked()
+    }
+}

app/src/main/java/ru/touchin/template/base/viewmodel/BaseController.kt

@@ -0,0 +1,6 @@
+package ru.touchin.template.base.viewmodel
+
+interface BaseController {
+
+    fun onBackClicked(): Boolean = true
+}

app/src/main/java/ru/touchin/template/base/viewmodel/BaseViewModel.kt

@@ -0,0 +1,5 @@
+package ru.touchin.template.base.viewmodel
+
+import androidx.lifecycle.ViewModel
+
+abstract class BaseViewModel : ViewModel(), BaseController

app/src/main/java/ru/touchin/template/di/AppComponent.kt

@@ -0,0 +1,37 @@
+package ru.touchin.template.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import ru.touchin.template.App
+import ru.touchin.template.di.auth.AuthComponent
+import ru.touchin.template.di.modules.AppModule
+import ru.touchin.template.di.modules.NavigationModule
+import ru.touchin.template.di.modules.ViewModelModule
+import ru.touchin.template.feature.SingleActivity
+
+@Component(
+        modules = [
+            AppModule::class,
+            ViewModelModule::class,
+            NavigationModule::class
+        ]
+)
+@AppScope
+interface AppComponent : SharedComponent {
+
+    fun authComponent(): AuthComponent.Builder
+
+    @Component.Builder
+    interface Builder {
+
+        @BindsInstance
+        fun appContext(appContext: Context): Builder
+
+        fun build(): AppComponent
+    }
+
+    fun inject(entry: App)
+
+    fun inject(entry: SingleActivity)
+}

app/src/main/java/ru/touchin/template/di/AppScope.kt

@@ -0,0 +1,6 @@
+package ru.touchin.template.di
+
+import javax.inject.Scope
+
+@Scope
+annotation class AppScope

app/src/main/java/ru/touchin/template/di/DI.kt

@@ -0,0 +1,16 @@
+package ru.touchin.template.di
+
+import android.content.Context
+
+object DI {
+
+    private lateinit var appComponent: AppComponent
+
+    fun init(context: Context) {
+        appComponent = DaggerAppComponent.builder()
+                .appContext(context)
+                .build()
+    }
+
+    fun getComponent(): AppComponent = appComponent
+}

app/src/main/java/ru/touchin/template/di/SharedComponentExt.kt

@@ -0,0 +1,17 @@
+package ru.touchin.template.di
+
+import android.app.Activity
+import android.content.Context
+import androidx.fragment.app.Fragment
+
+fun Context.getSharedModule(): SharedComponent {
+    return (applicationContext as SharedComponentProvider).getModule()
+}
+
+fun Activity.getSharedModule(): SharedComponent {
+    return (applicationContext as SharedComponentProvider).getModule()
+}
+
+fun Fragment.getSharedModule(): SharedComponent {
+    return requireContext().getSharedModule()
+}

app/src/main/java/ru/touchin/template/di/SharedComponentProvider.kt

@@ -0,0 +1,17 @@
+package ru.touchin.template.di
+
+import dagger.Module
+import ru.touchin.template.di.viewmodel.ViewModelFactory
+import ru.touchin.template.feature.second.SecondViewModel
+
+interface SharedComponent {
+    fun viewModelFactory(): ViewModelFactory
+    fun secondScreenViewModelFactory(): SecondViewModel.Factory
+}
+
+@Module
+class SharedModule
+
+interface SharedComponentProvider {
+    fun getModule(): SharedComponent
+}

app/src/main/java/ru/touchin/template/di/auth/AuthComponent.kt

@@ -0,0 +1,17 @@
+package ru.touchin.template.di.auth
+
+import dagger.Subcomponent
+import ru.touchin.template.feature.first.FirstFragment
+
+@Subcomponent(modules = [AuthModule::class])
+@AuthScope
+interface AuthComponent {
+
+    @Subcomponent.Builder
+    interface Builder {
+
+        fun build(): AuthComponent
+    }
+
+    fun inject(entry: FirstFragment)
+}

app/src/main/java/ru/touchin/template/di/auth/AuthModule.kt

@@ -0,0 +1,13 @@
+package ru.touchin.template.di.auth
+
+import dagger.Module
+
+@Module
+class AuthModule {
+
+//    @Provides
+//    @AuthScope
+//    internal fun providesSecondRepository(): SecondRepository {
+//        return SecondRepositoryImpl()
+//    }
+}

app/src/main/java/ru/touchin/template/di/auth/AuthScope.kt

@@ -0,0 +1,6 @@
+package ru.touchin.template.di.auth
+
+import javax.inject.Scope
+
+@Scope
+annotation class AuthScope

app/src/main/java/ru/touchin/template/di/modules/AppModule.kt

@@ -0,0 +1,13 @@
+package ru.touchin.template.di.modules
+
+import dagger.Module
+import ru.touchin.template.di.auth.AuthComponent
+
+@Module(
+        includes = [
+            RepositoryModule::class,
+            NetworkModule::class
+        ],
+        subcomponents = [AuthComponent::class]
+)
+class AppModule

app/src/main/java/ru/touchin/template/di/modules/NavigationModule.kt

@@ -0,0 +1,26 @@
+package ru.touchin.template.di.modules
+
+import com.github.terrakok.cicerone.Cicerone
+import com.github.terrakok.cicerone.NavigatorHolder
+import com.github.terrakok.cicerone.Router
+import dagger.Module
+import dagger.Provides
+import ru.touchin.template.di.AppScope
+
+@Module
+class NavigationModule {
+
+    private val cicerone: Cicerone<Router> = Cicerone.create()
+
+    @Provides
+    @AppScope
+    fun provideRouter(): Router {
+        return cicerone.router
+    }
+
+    @Provides
+    @AppScope
+    fun provideNavigatorHolder(): NavigatorHolder {
+        return cicerone.getNavigatorHolder()
+    }
+}

app/src/main/java/ru/touchin/template/di/modules/NetworkModule.kt

@@ -0,0 +1,7 @@
+package ru.touchin.template.di.modules
+
+import dagger.Module
+
+@Module
+class NetworkModule {
+}

app/src/main/java/ru/touchin/template/di/modules/RepositoryModule.kt

@@ -0,0 +1,7 @@
+package ru.touchin.template.di.modules
+
+import dagger.Module
+
+@Module
+class RepositoryModule {
+}

app/src/main/java/ru/touchin/template/di/modules/ViewModelModule.kt

@@ -0,0 +1,29 @@
+package ru.touchin.template.di.modules
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import dagger.Binds
+import dagger.Module
+import dagger.multibindings.IntoMap
+import ru.touchin.template.di.viewmodel.ViewModelFactory
+import ru.touchin.template.di.viewmodel.ViewModelKey
+import ru.touchin.template.feature.SingleViewModel
+import ru.touchin.template.feature.first.FirstViewModel
+
+@Module
+interface ViewModelModule {
+
+    @Binds
+    fun bindViewModelFactory(factory: ViewModelFactory): ViewModelProvider.Factory
+
+    @Binds
+    @IntoMap
+    @ViewModelKey(SingleViewModel::class)
+    fun bindsSingleViewModel(viewModel: SingleViewModel): ViewModel
+
+    @Binds
+    @IntoMap
+    @ViewModelKey(FirstViewModel::class)
+    fun bindsFirstViewModel(viewModel: FirstViewModel): ViewModel
+
+}

app/src/main/java/ru/touchin/template/di/viewmodel/ViewModelFactory.kt

@@ -0,0 +1,44 @@
+package ru.touchin.template.di.viewmodel
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+import androidx.lifecycle.AbstractSavedStateViewModelFactory
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.savedstate.SavedStateRegistryOwner
+import javax.inject.Inject
+import javax.inject.Provider
+
+class ViewModelFactory @Inject constructor(
+        private val viewModels: MutableMap<Class<out ViewModel>, Provider<ViewModel>>
+) : ViewModelProvider.Factory {
+
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        val viewModel = viewModels[modelClass]?.get()
+        return viewModel as T
+    }
+}
+
+inline fun <reified VM : ViewModel> Fragment.assistedViewModel(
+        crossinline creator: (SavedStateHandle) -> VM,
+): Lazy<VM> = viewModels { createAbstractSavedStateViewModelFactory(arguments, creator) }
+
+inline fun <reified T : ViewModel> SavedStateRegistryOwner.createAbstractSavedStateViewModelFactory(
+        arguments: Bundle? = Bundle(),
+        crossinline creator: (SavedStateHandle) -> T,
+): ViewModelProvider.Factory {
+    return object : AbstractSavedStateViewModelFactory(
+            owner = this@createAbstractSavedStateViewModelFactory,
+            defaultArgs = arguments,
+    ) {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel> create(
+                key: String,
+                modelClass: Class<T>,
+                handle: SavedStateHandle,
+        ): T = creator(handle) as T
+    }
+}

app/src/main/java/ru/touchin/template/di/viewmodel/ViewModelKey.kt

@@ -0,0 +1,9 @@
+package ru.touchin.template.di.viewmodel
+
+import androidx.lifecycle.ViewModel
+import dagger.MapKey
+import kotlin.reflect.KClass
+
+@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
+@MapKey
+annotation class ViewModelKey(val value: KClass<out ViewModel>)

app/src/main/java/ru/touchin/template/feature/SingleActivity.kt

@@ -0,0 +1,47 @@
+package ru.touchin.template.feature
+
+import android.os.Bundle
+import androidx.activity.viewModels
+import com.github.terrakok.cicerone.NavigatorHolder
+import com.github.terrakok.cicerone.androidx.AppNavigator
+import javax.inject.Inject
+import ru.touchin.template.R
+import ru.touchin.template.base.activity.BaseActivity
+import ru.touchin.template.databinding.ActivityMainBinding
+import ru.touchin.template.di.DI
+
+class SingleActivity : BaseActivity<SingleViewModel>() {
+
+    @Inject
+    lateinit var navigatorHolder: NavigatorHolder
+
+    private val rootNavigator by lazy {
+        AppNavigator(this, R.id.activityScreensContainer)
+    }
+
+    private lateinit var binding: ActivityMainBinding
+
+    override fun createViewModelLazy(): Lazy<SingleViewModel> = viewModels { viewModelFactory }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        DI.getComponent().inject(this)
+
+        viewModel.navigate()
+
+    }
+
+    override fun onResumeFragments() {
+        super.onResumeFragments()
+        navigatorHolder.setNavigator(rootNavigator)
+    }
+
+    override fun onPause() {
+        navigatorHolder.removeNavigator()
+        super.onPause()
+    }
+
+}

app/src/main/java/ru/touchin/template/feature/SingleViewModel.kt

@@ -0,0 +1,14 @@
+package ru.touchin.template.feature
+
+import androidx.lifecycle.ViewModel
+import com.github.terrakok.cicerone.Router
+import javax.inject.Inject
+import ru.touchin.template.navigation.Screens
+
+class SingleViewModel @Inject constructor(
+        private val router: Router,
+) : ViewModel() {
+    fun navigate() {
+        router.newRootScreen(Screens.First())
+    }
+}

app/src/main/java/ru/touchin/template/feature/first/FirstFragment.kt

@@ -0,0 +1,29 @@
+package ru.touchin.template.feature.first
+
+import android.os.Bundle
+import android.view.View
+import androidx.fragment.app.viewModels
+import ru.touchin.template.R
+import ru.touchin.template.base.fragment.BaseFragment
+import ru.touchin.template.databinding.FragmentFirstBinding
+import ru.touchin.template.utils.binding.viewBinding
+
+class FirstFragment : BaseFragment<FirstViewModel>(R.layout.fragment_first) {
+
+    private val binding by viewBinding { FragmentFirstBinding.bind(it) }
+
+    override fun createViewModelLazy() = viewModels<FirstViewModel> { viewModelFactory }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        with(binding) {
+            button.apply {
+                text = "Next"
+                setOnClickListener { viewModel.onNextButtonClicked(this@FirstFragment::class.toString()) }
+            }
+
+            textView.text = "First Fragment"
+        }
+    }
+}

app/src/main/java/ru/touchin/template/feature/first/FirstViewModel.kt

@@ -0,0 +1,16 @@
+package ru.touchin.template.feature.first
+
+import com.github.terrakok.cicerone.Router
+import javax.inject.Inject
+import ru.touchin.template.base.viewmodel.BaseViewModel
+import ru.touchin.template.navigation.Screens
+
+class FirstViewModel @Inject constructor(
+        private val router: Router
+) : BaseViewModel() {
+
+    fun onNextButtonClicked(from: String) {
+        router.navigateTo(Screens.Second(from))
+    }
+
+}

app/src/main/java/ru/touchin/template/feature/second/SecondFragment.kt

@@ -0,0 +1,64 @@
+package ru.touchin.template.feature.second
+
+import android.os.Bundle
+import android.view.View
+import androidx.core.os.bundleOf
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.flowWithLifecycle
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
+import ru.touchin.template.R
+import ru.touchin.template.base.fragment.BaseFragment
+import ru.touchin.template.databinding.FragmentSecondBinding
+import ru.touchin.template.di.viewmodel.assistedViewModel
+import ru.touchin.template.utils.binding.viewBinding
+
+class SecondFragment : BaseFragment<SecondViewModel>(R.layout.fragment_second) {
+
+    companion object {
+        private const val FROM_KEY = "FROM"
+        private const val SCREEN_NAME_KEY = "SCREEN_NAME"
+        private const val FRAGMENT_NAME = "Second Fragment"
+
+        fun newInstance(from: String): SecondFragment {
+            val args = bundleOf(FROM_KEY to from, SCREEN_NAME_KEY to FRAGMENT_NAME)
+
+            val fragment = SecondFragment().apply {
+                arguments = args
+            }
+
+            return fragment
+        }
+    }
+
+    private val binding by viewBinding { FragmentSecondBinding.bind(it) }
+
+    private val secondViewModelFactory by lazy { getSharedComponent().secondScreenViewModelFactory() }
+
+    override fun createViewModelLazy() = assistedViewModel {
+        secondViewModelFactory.create(
+                arguments?.getString(FROM_KEY) ?: "Unkown Fragment",
+                arguments?.getString(SCREEN_NAME_KEY) ?: "Unknown"
+        )
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        with(binding) {
+            button.apply {
+                text = "Back"
+                setOnClickListener { onBackPressed() }
+            }
+
+            viewLifecycleOwner.lifecycleScope.launch {
+                viewModel.state
+                        .flowWithLifecycle(lifecycle, Lifecycle.State.STARTED)
+                        .collect {
+                            textView.text = it
+                        }
+            }
+
+        }
+    }
+}

app/src/main/java/ru/touchin/template/feature/second/SecondViewModel.kt

@@ -0,0 +1,33 @@
+package ru.touchin.template.feature.second
+
+import com.github.terrakok.cicerone.Router
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import ru.touchin.template.base.viewmodel.BaseViewModel
+
+class SecondViewModel @AssistedInject constructor(
+        @Assisted("from") from: String,
+        @Assisted("screenName") screenName: String,
+        private val rootRouter: Router
+) : BaseViewModel() {
+
+    private val _state = MutableStateFlow("$from to $screenName")
+    val state: StateFlow<String> = _state.asStateFlow()
+
+    @AssistedFactory
+    interface Factory {
+        fun create(
+                @Assisted("from") from: String,
+                @Assisted("screenName") screenName: String
+        ): SecondViewModel
+    }
+
+    override fun onBackClicked(): Boolean {
+        rootRouter.exit()
+        return super.onBackClicked()
+    }
+}

app/src/main/java/ru/touchin/template/navigation/Screens.kt

@@ -0,0 +1,16 @@
+package ru.touchin.template.navigation
+
+import com.github.terrakok.cicerone.androidx.FragmentScreen
+import ru.touchin.template.feature.first.FirstFragment
+import ru.touchin.template.feature.second.SecondFragment
+
+object Screens {
+
+    fun First(): FragmentScreen = FragmentScreen {
+        FirstFragment()
+    }
+
+    fun Second(from: String): FragmentScreen = FragmentScreen {
+        SecondFragment.newInstance(from)
+    }
+}

app/src/main/java/ru/touchin/template/navigation/backpress/OnBackPressedListener.kt

@@ -0,0 +1,6 @@
+package ru.touchin.template.navigation.backpress
+
+interface OnBackPressedListener {
+
+    fun onBackPressed(): Boolean
+}

app/src/main/java/ru/touchin/template/navigation/router/RouterProvider.kt

@@ -0,0 +1,7 @@
+package ru.touchin.template.navigation.router
+
+import com.github.terrakok.cicerone.Router
+
+interface RouterProvider {
+    val router: Router
+}

app/src/main/java/ru/touchin/template/utils/binding/FragmentViewBindingDelegate.kt

@@ -0,0 +1,50 @@
+package ru.touchin.template.utils.binding
+
+import android.view.View
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleOwner
+import androidx.viewbinding.ViewBinding
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
+
+typealias ViewBindingFactory<T> = (View) -> T
+
+class FragmentViewBindingDelegate<T : ViewBinding>(
+        val fragment: Fragment,
+        val viewBindingFactory: ViewBindingFactory<T>,
+) : ReadOnlyProperty<Fragment, T> {
+    private var binding: T? = null
+
+    init {
+        fragment.lifecycle.addObserver(object : DefaultLifecycleObserver {
+            override fun onCreate(owner: LifecycleOwner) {
+                fragment.viewLifecycleOwnerLiveData.observe(fragment) { lifecylelOwner ->
+                    lifecylelOwner.lifecycle.addObserver(object : DefaultLifecycleObserver {
+                        override fun onDestroy(owner: LifecycleOwner) {
+                            binding = null
+                        }
+                    })
+                }
+            }
+        })
+    }
+
+    override fun getValue(thisRef: Fragment, property: KProperty<*>): T {
+        val binding = this.binding
+
+        if (binding != null) return binding
+
+        val lifecycle = fragment.viewLifecycleOwner.lifecycle
+
+        if (!lifecycle.currentState.isAtLeast(Lifecycle.State.INITIALIZED)) {
+            throw IllegalStateException("Should not attempt to get bindings when Fragment views are destroyed.")
+        }
+
+        return viewBindingFactory(thisRef.requireView()).also { this.binding = it }
+    }
+}
+
+fun <T : ViewBinding> Fragment.viewBinding(viewBindingFactory: ViewBindingFactory<T>) =
+        FragmentViewBindingDelegate(this, viewBindingFactory)

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

@@ -1,6 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
-
-<androidx.fragment.app.FragmentContainerView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/fragment_container"
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent" />
+    android:layout_height="match_parent"
+    android:background="@color/colorPrimaryDark">
+
+    <FrameLayout
+        android:id="@+id/activityScreensContainer"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginTop="40dp"
+        android:background="@color/colorPrimary"
+        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/layout/fragment_first.xml

@@ -0,0 +1,27 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintVertical_chainStyle="packed"
+        app:layout_constraintBottom_toTopOf="@+id/button"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintVertical_chainStyle="packed"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView" />
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,27 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintVertical_chainStyle="packed"
+        app:layout_constraintBottom_toTopOf="@+id/button"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintVertical_chainStyle="packed"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView" />
+</androidx.constraintlayout.widget.ConstraintLayout>

common-template

@@ -0,0 +1 @@
+Subproject commit d6f303bf879a2da1706cfdacaf2bbe0c326044bd