diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..4dda39e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,10 +3,6 @@ plugins {
     id 'org.jetbrains.kotlin.android'
 }
 
-kotlin {
-    jvmToolchain(17)
-}
-
 android {
     compileSdk 34
     namespace "otus.gpb.homework.fragments"
@@ -34,6 +30,9 @@ android {
     kotlinOptions {
         jvmTarget = '17'
     }
+    buildFeatures {
+        viewBinding true
+    }
 }
 
 dependencies {
@@ -42,6 +41,7 @@ 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.fragment:fragment-ktx:1.8.5'
     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..e17e9ba 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -21,6 +21,16 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".ActivityA"
+            android:launchMode="standard"
+            android:exported="false">
+        </activity>
+        <activity
+            android:name=".ActivityB"
+            android:launchMode="standard"
+            android:exported="false">
+        </activity>
     </application>
 
 </manifest>
\ No newline at end of file
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..550b7a8
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
@@ -0,0 +1,16 @@
+package otus.gpb.homework.fragments
+
+import android.annotation.SuppressLint
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityA: AppCompatActivity(R.layout.activity_a) {
+
+    @SuppressLint("ResourceType")
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        supportFragmentManager.beginTransaction()
+            .add(R.id.containerActivityA, FragmentMainActivityA())
+            .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..0990cf4
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
@@ -0,0 +1,26 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityB: AppCompatActivity() {
+
+    private val fragmentBA = FragmentBA()
+    private val fragmentBB = FragmentBB()
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_b)
+        val fm = supportFragmentManager.beginTransaction()
+        fm.add(R.id.containerBA, fragmentBB)
+        fm.add(R.id.containerBB, fragmentBA)
+        if(resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+            fm.hide(fragmentBB)
+        }
+        fm.commit()
+    }
+
+    fun getFragmentBA() = fragmentBA
+    fun getFragmentBB() = fragmentBB
+}
\ 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..900e5df
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,41 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.View
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import androidx.core.os.bundleOf
+import androidx.fragment.app.setFragmentResult
+
+class FragmentA : Fragment(R.layout.fragment_a) {
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        val backPressedCallBack = object : OnBackPressedCallback(true)
+        {
+            override fun handleOnBackPressed() {
+                if(parentFragmentManager.backStackEntryCount <= 1)
+                    requireActivity().finish()
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, backPressedCallBack)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val button = view.findViewById<Button>(R.id.buttonOpenFragmentAA)
+        button.setOnClickListener{
+            val bundle = Bundle()
+            bundle.putInt("toFragmentAA", ColorGenerator.generateColor())
+            val fragment = FragmentAA()
+            fragment.setArguments(bundle)
+
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.containerActivityA, fragment)
+                .addToBackStack("")
+                .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..c759203
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,42 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.View
+import android.widget.Button
+import androidx.core.os.bundleOf
+import androidx.fragment.app.setFragmentResult
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentAA : Fragment(R.layout.fragment_aa) {
+
+    private var color: Int? = null
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        if( savedInstanceState != null ) {
+            color = savedInstanceState.getInt("color")
+        } else {
+            color = getArguments()?.getInt("toFragmentAA")
+        }
+        color?.let{ view.setBackgroundColor(it) }
+
+       val button = view.findViewById<Button>(R.id.buttonOpenFragmentAB)
+       button.setOnClickListener(){
+           val bundle = Bundle()
+           bundle.putInt("colorToFragmentAB", ColorGenerator.generateColor())
+           val fragment = FragmentAB()
+           fragment.setArguments(bundle)
+           parentFragmentManager.beginTransaction()
+               .replace(R.id.containerActivityA, fragment)
+               .addToBackStack("")
+               .commit()
+       }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        color?.let{ outState.putInt("color", it) }
+    }
+}
\ 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..1039861
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,27 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.View
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentAB : Fragment(R.layout.fragment_ab) {
+
+    private var color: Int? = null
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        if(savedInstanceState != null) {
+            color = savedInstanceState.getInt("color")
+        } else {
+            color = getArguments()?.getInt("colorToFragmentAB")
+        }
+        color?.let{view.setBackgroundColor(it)}
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        color?.let{ outState.putInt("color", it) }
+    }
+}
\ 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..0f9dfe5
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,41 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.View
+import android.widget.Button
+import androidx.fragment.app.setFragmentResult
+import androidx.core.os.bundleOf
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentBA : Fragment(R.layout.fragment_ba) {
+
+    private var color: Int = 0
+    private lateinit var button: Button
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        button = view.findViewById<Button>(R.id.buttonOpenFragmentBB)
+        button.setOnClickListener() {
+            setFragmentResult("toFragmentBB", bundleOf("color" to color))
+            val fm = parentFragmentManager.beginTransaction()
+            if(resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+                fm.hide((requireActivity() as ActivityB).getFragmentBA())
+            }
+            fm.show((requireActivity() as ActivityB).getFragmentBB())
+            fm.commit()
+        }
+        setColorOfButton()
+        setFragmentResultListener("toFragmentBA") { _, bundle ->
+            val color = bundle.getInt("color")
+            getView()?.setBackgroundColor(color)
+            setColorOfButton()
+        }
+    }
+
+    private fun setColorOfButton(){
+        color = ColorGenerator.generateColor()
+        button.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..740e7f4
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,41 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.View
+import android.widget.Button
+import androidx.fragment.app.setFragmentResult
+import androidx.core.os.bundleOf
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentBB : Fragment(R.layout.fragment_bb) {
+
+    private var color: Int = 0
+    private lateinit var button: Button
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        button = view.findViewById<Button>(R.id.buttonOpenFragmentBA)
+        button.setOnClickListener(){
+            setFragmentResult("toFragmentBA", bundleOf("color" to color))
+            val fm = parentFragmentManager.beginTransaction()
+            if(resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+                fm.hide((requireActivity() as ActivityB).getFragmentBB())
+            }
+            fm.show((requireActivity() as ActivityB).getFragmentBA())
+            fm.commit()
+        }
+        setColorOfButton()
+        setFragmentResultListener("toFragmentBB") { _, bundle ->
+           val color = bundle.getInt("color")
+           getView()?.setBackgroundColor(color)
+           setColorOfButton()
+       }
+    }
+
+    private fun setColorOfButton(){
+        color = ColorGenerator.generateColor()
+        button.setBackgroundColor(color)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentMainActivityA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentMainActivityA.kt
new file mode 100644
index 0000000..87fc0a2
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentMainActivityA.kt
@@ -0,0 +1,20 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.View
+import android.widget.Button
+
+class FragmentMainActivityA : Fragment(R.layout.fragment_main_activity_a) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+            val button = view.findViewById<Button>(R.id.buttonOpenFragmentA)
+            button.setOnClickListener(){
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.containerActivityA, FragmentA())
+                    .addToBackStack("")
+                    .commit()
+        }
+    }
+}
\ 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..9ebacee 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 +1,28 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import otus.gpb.homework.fragments.databinding.ActivityMainBinding
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityMainBinding
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        binding.buttonFragmentA.setOnClickListener {
+            val intent = Intent(this, ActivityA::class.java)
+            //intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            startActivity(intent)
+        }
+        binding.buttonFragmentB.setOnClickListener {
+            val intent = Intent(this, ActivityB::class.java)
+            //intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            startActivity(intent)
+        }
     }
-}
\ No newline at end of file
+}
+
+
diff --git a/app/src/main/res/layout-land/activity_b.xml b/app/src/main/res/layout-land/activity_b.xml
new file mode 100644
index 0000000..49f2ccb
--- /dev/null
+++ b/app/src/main/res/layout-land/activity_b.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:baselineAligned="false"
+    android:orientation="horizontal"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/containerBB"
+        android:layout_weight="1"
+        android:layout_height="match_parent"
+        android:layout_width="match_parent" />
+
+    <FrameLayout
+        android:id="@+id/containerBA"
+        android:layout_weight="1"
+        android:layout_height="match_parent"
+        android:layout_width="match_parent" />
+
+</LinearLayout>
\ 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..7cdfa40
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/containerActivityA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
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..11a6040
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/containerBA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+    <FrameLayout
+        android:id="@+id/containerBB"
+        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/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 17eab17..04f8184 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -7,12 +7,38 @@
     tools:context=".MainActivity">
 
     <TextView
+        android:id="@+id/textView"
+        style="@style/TextAppearance.AppCompat.Title"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text="@string/a_m_main_activity"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.4" />
+
+    <Button
+        android:id="@+id/button_FragmentA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_activity_a"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintVertical_bias="0.5" />
+
+    <Button
+        android:id="@+id/button_FragmentB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_activity_b"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintVertical_bias="0.6" />
+
 
 </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..9227136
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,36 @@
+<?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/containerFragmentAA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <TextView
+        android:id="@+id/text"
+        style="@style/TextAppearance.AppCompat.Title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/i_m_fragment_a"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+    <Button
+        android:id="@+id/buttonOpenFragmentAA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_fragment_aa"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.4" />
+
+</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..e11a0ae
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,31 @@
+<?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/text"
+        style="@style/TextAppearance.AppCompat.Title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/i_m_fragment_aa"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+    <Button
+        android:id="@+id/buttonOpenFragmentAB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_fragment_ab"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.4" />
+
+</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..d49f55b
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/text"
+        style="@style/TextAppearance.AppCompat.Title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/i_m_fragment_ab"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+</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..7737080
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,31 @@
+<?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/text"
+        style="@style/TextAppearance.AppCompat.Title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/i_m_fragment_ba"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+    <Button
+        android:id="@+id/buttonOpenFragmentBB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/send_this_color_to_fragment_bb"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.4" />
+
+</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..aefc004
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,31 @@
+<?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/text"
+        style="@style/TextAppearance.AppCompat.Title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/i_m_fragment_bb"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+    <Button
+        android:id="@+id/buttonOpenFragmentBA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/send_this_color_to_fragment_ba"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.4" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_main_activity_a.xml b/app/src/main/res/layout/fragment_main_activity_a.xml
new file mode 100644
index 0000000..c9f4ec3
--- /dev/null
+++ b/app/src/main/res/layout/fragment_main_activity_a.xml
@@ -0,0 +1,36 @@
+<?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/containerFragmentA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <TextView
+        android:id="@+id/text"
+        style="@style/TextAppearance.AppCompat.Title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/i_m_fragment_main_activity_a"
+        app:layout_constraintBottom_toBottomOf="@+id/containerFragmentA"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+    <Button
+        android:id="@+id/buttonOpenFragmentA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_fragment_a"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.4" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 34277aa..0edd971 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,17 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <string name="open_activity_a">Open Activity A</string>
+    <string name="open_activity_b">Open Activity B</string>
+    <string name="i_m_fragment_a">I\'m Fragment A</string>
+    <string name="open_fragment_aa">Open Fragment AA</string>
+    <string name="a_m_main_activity">A\'m Main Activity</string>
+    <string name="i_m_fragment_aa">I\'m Fragment AA</string>
+    <string name="open_fragment_ab">Open Fragment AB</string>
+    <string name="i_m_fragment_ab">I\'m Fragment AB</string>
+    <string name="i_m_fragment_ba">I\'m Fragment BA</string>
+    <string name="send_this_color_to_fragment_bb">Send This Color To Fragment BB</string>
+    <string name="i_m_fragment_bb">I\'m Fragment BB</string>
+    <string name="send_this_color_to_fragment_ba">Send This Color To Fragment BA</string>
+    <string name="i_m_fragment_main_activity_a">I\'m Fragment Main Activity A</string>
+    <string name="open_fragment_a">Open Fragment A</string>
 </resources>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index bd20018..6818023 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 '8.7.3' apply false
+    id 'com.android.library' version '8.7.3' apply false
     id 'org.jetbrains.kotlin.android' version '2.0.21' apply false
 }