diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..ec84345 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -42,6 +42,7 @@ dependencies {
     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.activity:activity:1.9.3'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9604b34..46bc072 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,6 +12,12 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Fragments"
         tools:targetApi="31">
+        <activity
+            android:name=".ActivityB"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityA"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
new file mode 100644
index 0000000..1bcc69f
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
@@ -0,0 +1,20 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityA : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_a)
+
+        if (savedInstanceState == null) {
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragmentA, FragmentA())
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
new file mode 100644
index 0000000..dedfa79
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
@@ -0,0 +1,31 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration.ORIENTATION_PORTRAIT
+import android.os.Bundle
+import android.util.Log
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+
+
+class ActivityB : AppCompatActivity() {
+    var fragmentBA = FragmentBA()
+    var fragmentBB = FragmentBB()
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_b)
+
+        val transaction =
+            supportFragmentManager.beginTransaction().replace(R.id.fragmentBA, fragmentBA)
+                .replace(R.id.fragmentBB, fragmentBB)
+        val orientation = resources.configuration.orientation
+
+        Log.d("TAG", orientation.toString())
+        Log.d("TAG", (orientation == ORIENTATION_PORTRAIT).toString())
+
+        if (orientation == ORIENTATION_PORTRAIT) {
+            transaction.hide(fragmentBB)
+        }
+        transaction.commit()
+    }
+}
\ 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..380df5c
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,48 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+
+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
+                    activity?.finish()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, callback)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        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.buttonFragmentA).setOnClickListener {
+            val color = ColorGenerator.generateColor()
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragmentAA, FragmentAA.newInstance(color))
+                .addToBackStack(null)
+                .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..0429aad
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,76 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import android.widget.FrameLayout
+import androidx.activity.OnBackPressedCallback
+
+private const val ARG_COLOR = "color"
+class FragmentAA : Fragment() {
+    private var color: Int? = null
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 0) {
+                    childFragmentManager.popBackStack()
+                }
+                else {
+                    parentFragmentManager.popBackStack()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, callback)
+    }
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(ARG_COLOR)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_a_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val layout = view.findViewById<FrameLayout>(R.id.fragmentAALayout)
+        val value = arguments?.getInt(ARG_COLOR)
+        if (value != null) {
+            layout.setBackgroundColor(value)
+        }
+
+        view.findViewById<Button>(R.id.buttonFragmentAA).setOnClickListener {
+            val color = ColorGenerator.generateColor()
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragmentAB, FragmentAB.newInstance(color))
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(ARG_COLOR, color)
+                }
+            }
+    }
+}
\ 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..6b38841
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,53 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.FrameLayout
+
+private const val ARG_COLOR = "color"
+/**
+ * A simple [Fragment] subclass.
+ * Use the [FragmentAB.newInstance] factory method to
+ * create an instance of this fragment.
+ */
+class FragmentAB : Fragment() {
+    private var color: Int? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(ARG_COLOR)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_a_b, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val layout = view.findViewById<FrameLayout>(R.id.fragmentABLayout)
+        val value = arguments?.getInt(ARG_COLOR)
+        if (value != null) {
+            layout.setBackgroundColor(value)
+        }
+    }
+
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAB().apply {
+                arguments = Bundle().apply {
+                    putInt(ARG_COLOR, color)
+                }
+            }
+    }
+}
\ No newline at end of file
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..571d103
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,37 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import android.widget.FrameLayout
+class FragmentBA : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_b_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.buttonFragmentBA)?.setOnClickListener {
+            val activityB = requireActivity() as ActivityB
+
+            parentFragmentManager.beginTransaction()
+                .hide(activityB.fragmentBA)
+                .show(activityB.fragmentBB)
+                .commit()
+        }
+
+        parentFragmentManager.setFragmentResultListener("result", this) { _, result ->
+            val value = result.getInt("color")
+            view.findViewById<FrameLayout>(R.id.fragmentBALayout).setBackgroundColor(value)
+        }
+    }
+}
\ 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..963fd71
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,38 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+
+class FragmentBB : Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_b_b, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.buttonFragmentBB).setOnClickListener {
+            val orientation =  resources.configuration.orientation
+            if (orientation == Configuration.ORIENTATION_PORTRAIT) {
+                val activityB = requireActivity() as ActivityB
+                parentFragmentManager.beginTransaction()
+                    .hide(activityB.fragmentBB)
+                    .show(activityB.fragmentBA)
+                    .commit()
+            }
+
+            val result = Bundle()
+            result.putInt("color", ColorGenerator.generateColor())
+            parentFragmentManager.setFragmentResult("result", result)
+        }
+    }
+}
\ No newline at end of file
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..cd1de77 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -1,6 +1,8 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
+import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
 
 class MainActivity : AppCompatActivity() {
@@ -8,5 +10,13 @@ class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        findViewById<Button>(R.id.buttonA).setOnClickListener {
+            startActivity(Intent(this, ActivityA::class.java))
+        }
+
+        findViewById<Button>(R.id.buttonB).setOnClickListener {
+            startActivity(Intent(this, ActivityB::class.java))
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout-port/activity_b.xml b/app/src/main/res/layout-port/activity_b.xml
new file mode 100644
index 0000000..340d4a3
--- /dev/null
+++ b/app/src/main/res/layout-port/activity_b.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout 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/fragmentBA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentBB"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout-port/fragment_b_a.xml b/app/src/main/res/layout-port/fragment_b_a.xml
new file mode 100644
index 0000000..48730a1
--- /dev/null
+++ b/app/src/main/res/layout-port/fragment_b_a.xml
@@ -0,0 +1,28 @@
+<?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:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/purple_700"
+    android:id="@+id/fragmentBALayout"
+    tools:context=".FragmentBA">
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="50dp">
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:text="@string/fragment_ba" />
+
+        <Button
+            android:id="@+id/buttonFragmentBA"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/open_fragment_bb" />
+    </LinearLayout>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_a.xml b/app/src/main/res/layout/activity_a.xml
new file mode 100644
index 0000000..81d6a78
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.xml
@@ -0,0 +1,11 @@
+<?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="vertical">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_b.xml b/app/src/main/res/layout/activity_b.xml
new file mode 100644
index 0000000..bf05a5b
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,26 @@
+<?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:baselineAligned="false"
+    android:orientation="horizontal"
+    android:showDividers="middle">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentBA"
+        android:layout_width="0dp"
+        android:layout_weight="1"
+        android:layout_height="match_parent" />
+
+    <View
+        android:layout_width="1dp"
+        android:layout_height="wrap_content"
+        android:background="#000000" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentBB"
+        android:layout_width="0dp"
+        android:layout_weight="1"
+        android:layout_height="match_parent" />
+
+</LinearLayout>
\ 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..e038e55 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -7,12 +7,34 @@
     tools:context=".MainActivity">
 
     <TextView
+        android:id="@+id/textview"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text="@string/hello_fragments"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <Button
+        android:id="@+id/buttonA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/activity_a"
+        app:layout_constraintTop_toBottomOf="@id/textview"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        />
+
+    <Button
+        android:id="@+id/buttonB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/activity_b"
+        app:layout_constraintTop_toBottomOf="@id/buttonA"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        />
+
+
 </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..84a005b
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,33 @@
+<?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/fragmentALayout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentA">
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="50dp">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/fragment_a" />
+
+        <Button
+            android:id="@+id/buttonFragmentA"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/open_fragment_aa" />
+
+
+    </LinearLayout>
+
+    <FrameLayout
+        android:id="@+id/fragmentAA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_a_a.xml b/app/src/main/res/layout/fragment_a_a.xml
new file mode 100644
index 0000000..9e45e14
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a_a.xml
@@ -0,0 +1,32 @@
+<?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/fragmentAALayout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentAA">
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="50dp">
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:text="@string/fragment_aa" />
+
+        <Button
+            android:id="@+id/buttonFragmentAA"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/open_fragment_ab" />
+
+    </LinearLayout>
+
+    <FrameLayout
+        android:id="@+id/fragmentAB"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_a_b.xml b/app/src/main/res/layout/fragment_a_b.xml
new file mode 100644
index 0000000..a9c559d
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a_b.xml
@@ -0,0 +1,15 @@
+<?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:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:id="@+id/fragmentABLayout"
+    android:padding="50dp"
+    tools:context=".FragmentAB">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="@string/fragment_ab" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_b_a.xml b/app/src/main/res/layout/fragment_b_a.xml
new file mode 100644
index 0000000..5684cbd
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b_a.xml
@@ -0,0 +1,16 @@
+<?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:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/purple_700"
+    android:id="@+id/fragmentBALayout"
+    tools:context=".FragmentBA">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:padding="50dp"
+        android:text="@string/fragment_ba" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_b_b.xml b/app/src/main/res/layout/fragment_b_b.xml
new file mode 100644
index 0000000..ff30438
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b_b.xml
@@ -0,0 +1,27 @@
+<?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:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/purple_200"
+    tools:context=".FragmentBB">
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="50dp">
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:text="@string/fragment_bb" />
+
+        <Button
+            android:id="@+id/buttonFragmentBB"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/send_color" />
+
+    </LinearLayout>
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index 44ed4ea..8d681e9 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,6 +1,6 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
-    <style name="Theme.Fragments" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+    <style name="Theme.Fragments" parent="Theme.MaterialComponents.DayNight.NoActionBar">
         <!-- Primary brand color. -->
         <item name="colorPrimary">@color/purple_200</item>
         <item name="colorPrimaryVariant">@color/purple_700</item>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 34277aa..a01e0e7 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,15 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <string name="hello_fragments">Hello Fragments!</string>
+    <string name="activity_a">Activity A</string>
+    <string name="activity_b">Activity B</string>
+    <string name="fragment_a">Fragment A</string>
+    <string name="open_fragment_aa">Open fragment AA</string>
+    <string name="fragment_aa">Fragment AA</string>
+    <string name="open_fragment_ab">Open fragment AB</string>
+    <string name="fragment_ab">Fragment AB</string>
+    <string name="fragment_bb">Fragment BB</string>
+    <string name="fragment_ba">Fragment BA</string>
+    <string name="open_fragment_bb">Open Fragment BB</string>
+    <string name="send_color">Send color</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9a64f26..c1a4865 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,6 +1,6 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
-    <style name="Theme.Fragments" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+    <style name="Theme.Fragments" parent="Theme.MaterialComponents.DayNight.NoActionBar">
         <!-- Primary brand color. -->
         <item name="colorPrimary">@color/purple_500</item>
         <item name="colorPrimaryVariant">@color/purple_700</item>
diff --git a/build.gradle b/build.gradle
index bd20018..f56c8db 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '8.7.2' apply false
-    id 'com.android.library' version '8.7.2' apply false
+    id 'com.android.application' version '8.4.0' apply false
+    id 'com.android.library' version '8.4.0' apply false
     id 'org.jetbrains.kotlin.android' version '2.0.21' apply false
 }