diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..66b055d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -4,17 +4,17 @@ plugins {
 }
 
 kotlin {
-    jvmToolchain(17)
+    jvmToolchain(20)
 }
 
 android {
-    compileSdk 34
+    compileSdk 35
     namespace "otus.gpb.homework.fragments"
 
     defaultConfig {
         applicationId "otus.gpb.homework.fragments"
         minSdk 26
-        targetSdk 34
+        targetSdk 35
         versionCode 1
         versionName "1.0"
 
@@ -28,21 +28,23 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_17
+        sourceCompatibility JavaVersion.VERSION_20
+        targetCompatibility JavaVersion.VERSION_20
     }
     kotlinOptions {
-        jvmTarget = '17'
+        jvmTarget = '20'
     }
 }
 
 dependencies {
 
-    implementation 'androidx.core:core-ktx:1.7.0'
-    implementation 'androidx.appcompat:appcompat:1.5.1'
-    implementation 'com.google.android.material:material:1.6.1'
-    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation "androidx.core:core-ktx:1.16.0"
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'com.google.android.material:material:1.12.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.2.1'
+    implementation "androidx.fragment:fragment-ktx:1.8.6"
     testImplementation 'junit:junit:4.13.2'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ColorViewModel.kt b/app/src/main/java/otus/gpb/homework/fragments/ColorViewModel.kt
new file mode 100644
index 0000000..100779e
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ColorViewModel.kt
@@ -0,0 +1,14 @@
+package otus.gpb.homework.fragments
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class ColorViewModel : ViewModel() {
+    private val _currentColor = MutableLiveData<Int>()
+    val currentColor: LiveData<Int> get() = _currentColor
+
+    fun setColor(color: Int) {
+        _currentColor.value = color
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Const.kt b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
new file mode 100644
index 0000000..634ef16
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
@@ -0,0 +1,6 @@
+package otus.gpb.homework.fragments
+
+const val RESULT_KEY_A = "key_color_a"
+const val RESULT_KEY_A_A = "key_color_a_a"
+
+const val RESULT_BUNDLE = "bundle"
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
new file mode 100644
index 0000000..5b51b30
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,63 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import androidx.core.os.bundleOf
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
+
+class FragmentA : Fragment() {
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 0) {
+                    childFragmentManager.popBackStack()
+                } else {
+                    isEnabled = false
+                    @Suppress("DEPRECATION")
+                    requireActivity().onBackPressed()
+                }
+            }
+        }
+
+        requireActivity().onBackPressedDispatcher.addCallback(callback)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.btn_open_fragment_aa).setOnClickListener {
+            val backgroundColor = ColorGenerator.generateColor()
+
+            childFragmentManager.setFragmentResult(
+                RESULT_KEY_A,
+                bundleOf(RESULT_BUNDLE to backgroundColor)
+            )
+            childFragmentManager.popBackStackImmediate(
+                "fragmentA",
+                FragmentManager.POP_BACK_STACK_INCLUSIVE
+            )
+
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container_a, FragmentAA())
+                .addToBackStack("fragmentA")
+                .commit()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
new file mode 100644
index 0000000..05c78a9
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,53 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.core.os.bundleOf
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentAA : Fragment() {
+    private val SAVED_COLOR = "saved_color"
+    private var savedBackgroundColor: Int = ColorGenerator.generateColor()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        savedBackgroundColor = savedInstanceState?.getInt(SAVED_COLOR) ?: savedBackgroundColor
+        return inflater.inflate(R.layout.fragment_aa, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(savedBackgroundColor)
+
+        view.findViewById<Button>(R.id.btn_open_fragment_ab).setOnClickListener {
+            val backgroundColor = ColorGenerator.generateColor()
+
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container_a, FragmentAB())
+                .addToBackStack("fragmentAB")
+                .commit()
+
+            parentFragmentManager.setFragmentResult(
+                RESULT_KEY_A_A,
+                bundleOf(RESULT_BUNDLE to backgroundColor)
+            )
+        }
+
+        setFragmentResultListener(RESULT_KEY_A) { _, bundle ->
+            savedBackgroundColor = bundle.getInt(RESULT_BUNDLE)
+            view.setBackgroundColor(savedBackgroundColor)
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putInt(SAVED_COLOR, savedBackgroundColor)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
new file mode 100644
index 0000000..1e9afc4
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,26 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentAB : Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ab, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        setFragmentResultListener(RESULT_KEY_A_A) { _, bundle ->
+            view.setBackgroundColor(bundle.getInt(RESULT_BUNDLE))
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
new file mode 100644
index 0000000..a42b1df
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
@@ -0,0 +1,59 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+
+
+class FragmentB : Fragment() {
+    private val viewModel: ColorViewModel by viewModels()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(
+            R.layout.fragment_b,
+            container,
+            false
+        )
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        viewModel.currentColor.observe(viewLifecycleOwner) { color ->
+            updateFragments(color)
+        }
+        if (resources.getBoolean(R.bool.isLandscape)) {
+            showLandscape()
+        } else {
+            showPortrait()
+        }
+        super.onViewCreated(view, savedInstanceState)
+    }
+
+    private fun showLandscape() {
+        childFragmentManager.beginTransaction()
+            .replace(R.id.fragment_view_container_ba, FragmentBA())
+            .replace(R.id.fragment_view_container_bb, FragmentBB())
+            .commit()
+    }
+
+    private fun showPortrait() {
+        childFragmentManager.beginTransaction()
+            .addToBackStack(null)
+            .replace(R.id.fragment_view_container_ba, FragmentBA())
+            .commit()
+    }
+
+    private fun updateFragments(color: Int) {
+        val fragmentBA = childFragmentManager.findFragmentById(R.id.fragment_view_container_ba)
+        if (fragmentBA is FragmentBA) {
+            fragmentBA.updateColor(color)
+        }
+    }
+
+}
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
new file mode 100644
index 0000000..be1dff6
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,42 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+
+class FragmentBA : Fragment() {
+    private val parentViewModel: ColorViewModel by activityViewModels()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ba, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        parentViewModel.currentColor.observe(viewLifecycleOwner) { color ->
+            view.setBackgroundColor(color)
+        }
+
+        if (!requireContext().isLandscape()) {
+            view.findViewById<Button>(R.id.btn_open_fragment_bb).setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.fragment_view_container_ba, FragmentBB())
+                    .addToBackStack(null)
+                    .commit()
+            }
+        }
+    }
+
+    fun updateColor(color: Int) {
+        view?.setBackgroundColor(color)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
new file mode 100644
index 0000000..7ba82ea
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,34 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+
+class FragmentBB : Fragment() {
+    private val parentViewModel: ColorViewModel by activityViewModels()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_bb, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.btn_send_color_to_ba).setOnClickListener {
+            val backgroundColor = ColorGenerator.generateColor()
+            parentViewModel.setColor(backgroundColor)
+
+            if (!requireContext().isLandscape()) {
+                parentFragmentManager.popBackStack()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Helper.kt b/app/src/main/java/otus/gpb/homework/fragments/Helper.kt
new file mode 100644
index 0000000..2ea6b19
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Helper.kt
@@ -0,0 +1,7 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.content.res.Configuration
+
+fun Context.isLandscape() =
+    resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE
diff --git a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
index 5e89c44..b6b515e 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -1,12 +1,39 @@
 package otus.gpb.homework.fragments
 
 import android.os.Bundle
+import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.FragmentManager
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        findViewById<Button>(R.id.btn_open_fragment_a).setOnClickListener {
+            supportFragmentManager.popBackStackImmediate(
+                "fragmentA",
+                FragmentManager.POP_BACK_STACK_INCLUSIVE
+            )
+
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container, FragmentA())
+                .addToBackStack("fragmentA")
+                .commit()
+        }
+
+        findViewById<Button>(R.id.btn_open_fragment_b).setOnClickListener {
+            supportFragmentManager.popBackStackImmediate(
+                "fragmentB",
+                FragmentManager.POP_BACK_STACK_INCLUSIVE
+            )
+
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container, FragmentB())
+                .addToBackStack("fragmentB")
+                .commit()
+        }
     }
+
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/fragment_b.xml b/app/src/main/res/layout-land/fragment_b.xml
new file mode 100644
index 0000000..f491fe8
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_b.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="horizontal">
+
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_ba"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_bb"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/fragment_ba.xml b/app/src/main/res/layout-land/fragment_ba.xml
new file mode 100644
index 0000000..fe39a87
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_ba.xml
@@ -0,0 +1,18 @@
+<?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/txt_fragment_ba_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Fragment BA"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 17eab17..ad93e45 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,15 +4,47 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:fitsSystemWindows="true"
     tools:context=".MainActivity">
 
-    <TextView
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@id/btn_open_fragment_a"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <androidx.constraintlayout.widget.Guideline
+        android:id="@+id/guideline"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:orientation="vertical"
+
+        app:layout_constraintGuide_percent="0.5" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_a"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="5dp"
+        android:layout_marginEnd="2.5dp"
+        android:layout_marginBottom="5dp"
+        android:text="Fragment A"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@id/guideline"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_b"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="2.5dp"
+        android:layout_marginEnd="5dp"
+        android:layout_marginBottom="5dp"
+        android:text="Fragment B"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintStart_toEndOf="@id/guideline" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_a.xml b/app/src/main/res/layout/fragment_a.xml
new file mode 100644
index 0000000..afa29cf
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,37 @@
+<?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"
+    android:gravity="center_vertical"
+    android:orientation="vertical">
+
+    <TextView
+        android:id="@+id/txt_fragment_a_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="FragmentA"
+        android:textAlignment="center"
+        android:textSize="26sp"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_aa"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginHorizontal="10dp"
+        android:text="Open fragment AA"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_a_title" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_a"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btn_open_fragment_aa" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
new file mode 100644
index 0000000..bcfdb22
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,28 @@
+<?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/txt_fragment_aa_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Fragment AA"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_ab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginHorizontal="10dp"
+        android:text="Open fragment AB"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_aa_title" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
new file mode 100644
index 0000000..88a5744
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,17 @@
+<?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/txt_fragment_a_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="FragmentAB"
+        android:textAlignment="center"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_b.xml b/app/src/main/res/layout/fragment_b.xml
new file mode 100644
index 0000000..72c1073
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b.xml
@@ -0,0 +1,12 @@
+<?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">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_ba"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ba.xml b/app/src/main/res/layout/fragment_ba.xml
new file mode 100644
index 0000000..39b345e
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,28 @@
+<?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/txt_fragment_ba_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Fragment BA"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_bb"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginHorizontal="10dp"
+        android:text="Open fragment BB"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_ba_title" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_bb.xml b/app/src/main/res/layout/fragment_bb.xml
new file mode 100644
index 0000000..8c0c650
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,28 @@
+<?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/txt_fragment_bb_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Fragment BB"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_send_color_to_ba"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginHorizontal="10dp"
+        android:text="Send Color"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_bb_title" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values-land/bools.xml b/app/src/main/res/values-land/bools.xml
new file mode 100644
index 0000000..fc1d851
--- /dev/null
+++ b/app/src/main/res/values-land/bools.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <bool name="isLandscape">true</bool>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/bools.xml b/app/src/main/res/values/bools.xml
new file mode 100644
index 0000000..214d589
--- /dev/null
+++ b/app/src/main/res/values/bools.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <bool name="isLandscape">false</bool>
+</resources>
\ No newline at end of file