diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9604b34..c2e9051 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -21,6 +21,19 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <activity
+            android:name=".ActivityA"
+            android:exported="false"
+            android:launchMode="standard"
+            />
+
+        <activity
+            android:name=".ActivityB"
+            android:exported="false"
+            android:launchMode="standard"
+            />
+
     </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..447e3dd
--- /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.appcompat.app.AppCompatActivity
+
+class ActivityA : AppCompatActivity() {
+
+    //private lateinit var fragmentA: FragmentA
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_a)
+        // По клику на кнопку запустите фрагмент транзакцию которая открывает FragmentA.
+        // в нашем случае "По клику на кнопку" === "при запуске Actity A"
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.container_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..9d95c7d
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
@@ -0,0 +1,35 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.View
+import android.widget.FrameLayout
+import androidx.appcompat.app.AppCompatActivity
+import java.util.Objects
+
+class ActivityB : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_b)
+
+        // ландшафтный режим - отобразить оба фрагмента одновременно
+        if (Objects.equals(Configuration.ORIENTATION_LANDSCAPE, resources.configuration.orientation)) {
+            findViewById<FrameLayout>(R.id.frameLayout_bb).visibility = View.VISIBLE
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.frameLayout_ba, FragmentBA())
+                .replace(R.id.frameLayout_bb, FragmentBB())
+                .commit()
+        }
+        else {
+            // портретный режим режим - отобразить только один фрагмент
+            findViewById<FrameLayout>(R.id.frameLayout_bb).visibility = View.GONE
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.frameLayout_ba, FragmentBA())
+                .commit()
+        }
+    }
+
+    private fun isLandscape() =
+        Objects.equals(Configuration.ORIENTATION_LANDSCAPE, resources.configuration.orientation)
+}
\ 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..14a1f91
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.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 android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+
+
+class FragmentA : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?,
+    ): View? {
+        val view = inflater.inflate(R.layout.fragment_a, container, false)
+        val btnOpenFragmentAA = view.findViewById<Button>(R.id.btn_open_FragmentAA)
+
+        // Реализуйте обработку нажатия на кнопку “Назад”, используя OnBackPressedDispatcher,
+        requireActivity().onBackPressedDispatcher.addCallback(
+            viewLifecycleOwner,
+            object : OnBackPressedCallback(true) {
+                override fun handleOnBackPressed() {
+                    // таким образом, что
+                    if (childFragmentManager.backStackEntryCount == 1) {
+                        // После того как размер стека = 1, закрывайте активити.
+                        requireActivity().finish()
+                    } else {
+                        //по нажатию из стека фрагментов удаляется один фрагмент
+                        childFragmentManager.popBackStack()
+                    }
+                }
+            }
+        )
+
+        //В FragmentA добавьте кнопку, которая открывает фрагмент FragmentAA,
+        // при этом он должен быть child фрагментом для FragmentA.
+        btnOpenFragmentAA.setOnClickListener {
+            // проверяем стек транзакций
+            if (childFragmentManager.backStackEntryCount == 0) {
+                // стек пустой - создадим FragmentAA
+                val fragmentAa = FragmentAA()
+                val args = Bundle()
+                // При открытии FragmentAA, передайте в него цвет, полученный из рандомайзера ColorGenerator
+                args.putInt("color", ColorGenerator.generateColor())
+                fragmentAa.arguments = args
+                childFragmentManager.beginTransaction()
+                    .add(R.id.layout_FragmentA, fragmentAa)
+                    .addToBackStack(null)
+                    .commit()
+            }
+        }
+
+        return view
+    }
+}
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..37fdae4
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,35 @@
+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
+
+class FragmentAA : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?,
+    ): View? {
+        val view = inflater.inflate(R.layout.fragment_aa, container, false)
+        // ...покрасьте FragmentAA в этот цвет.
+        arguments?.getInt("color")?.let { view.setBackgroundColor(it) }
+
+        view.findViewById<Button>(R.id.btn_open_FragmentAB).setOnClickListener {
+            val fragmentAb = FragmentAB()
+            val args = Bundle()
+            args.putInt("color", ColorGenerator.generateColor())
+            fragmentAb.arguments = args
+
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.layout_FragmentA, fragmentAb, "fragmentAb")
+                .addToBackStack(null)
+                .commit()
+        }
+
+        return view
+    }
+}
\ 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..5acc61b
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,23 @@
+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
+
+class FragmentAB : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?,
+    ): View? {
+        val view = inflater.inflate(R.layout.fragment_ab, container, false)
+        // и покрасьте FragmentAA в этот цвет
+        arguments?.getInt("color")?.let { view.setBackgroundColor(it) }
+
+        return view
+    }
+}
\ 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..243bc0c
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,55 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+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 java.util.Objects
+
+private const val KEY_COLOR = "key_color"
+
+class FragmentBA: Fragment() {
+
+    private var color: Int = 0
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?, ): View? {
+        val view = inflater.inflate(R.layout.fragment_ba, container, false)
+
+        // Покрасте фон FragmentBA в полученный цвет.
+        parentFragmentManager.setFragmentResultListener(KEY_COLOR, this) { _, bundle ->
+            color = bundle.getInt(KEY_COLOR)
+            view.setBackgroundColor(color)
+        }
+
+        val btnOpenFragmentBB = view.findViewById<Button>(R.id.btn_open_FragmentBB)
+
+        // Если девайс находится в portrait ориентации, добавьте в FragmentBA кнопку,
+        // в данном случае кнопку скрываем / показываем
+        btnOpenFragmentBB.visibility = when (isPortrait()) {
+            true -> View.VISIBLE
+            false -> View.GONE
+        }
+        // по нажатию на которой будет открываться FragmentBB, на том же уровне иерархии, что и FragmentBA.
+        btnOpenFragmentBB.setOnClickListener {
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.frameLayout_ba, FragmentBB(), "FragmentBB")
+                .commit()
+        }
+        return view
+    }
+    // ориентация экрана
+    private fun isPortrait(): Boolean =
+        Objects.equals(Configuration.ORIENTATION_PORTRAIT, resources.configuration.orientation)
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putInt(KEY_COLOR, 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..c905cd1
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,55 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+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 java.util.Objects
+
+private const val KEY_COLOR = "key_color"
+
+class FragmentBB: Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?,
+    ): View? {
+        val view = inflater.inflate(R.layout.fragment_bb, container, false)
+
+        // перерисуем fragmentBA с новым цветом
+        view.findViewById<Button>(R.id.btn_SendColor)
+            .setOnClickListener {
+                val args = Bundle()
+                args.putInt(KEY_COLOR, ColorGenerator.generateColor())
+                if (isPortrait()) {
+                    // Если девайс находится в portrait ориентации,
+                    // В FragmentBB добавьте кнопку, которая получит цвет из рандомайзера ColorGenerator
+                    // и вернет результат в FragmentBA. Как и в пункте 1, покрасте фон FragmentBA в полученный цвет.
+                    val fragmentBA = FragmentBA()
+                    fragmentBA.arguments = args
+                    parentFragmentManager.beginTransaction()
+                        .replace(R.id.frameLayout_ba, fragmentBA).apply {
+                            fragmentBA.arguments = args
+                            parentFragmentManager.setFragmentResult(KEY_COLOR, args)
+                        }
+                        .commit()
+                }
+                else {
+                    // Если девайс находится в landscape ориентации, то расположите фрагменты на одном уровне иерархии.
+                    // В фрагмент FragmentBB добавьте кнопку, по нажатию на которую программа получит цвет из рандомайзера ColorGenerator
+                    // и передаст его в FragmentBA, используя FragmentResultListener.
+                    parentFragmentManager.setFragmentResult(KEY_COLOR, args)
+                }
+            }
+
+        return view
+    }
+    // ориентация экрана
+    private fun isPortrait(): Boolean =
+        Objects.equals(Configuration.ORIENTATION_PORTRAIT, resources.configuration.orientation)
+}
\ 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..a927875 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 +10,15 @@ class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        // Реализуйте кнопки перехода в активити с фрагментами в MainActivity.
+        findViewById<Button>(R.id.btn_open_ActivityA).setOnClickListener {
+            startActivity(Intent(this, ActivityA::class.java))
+        }
+
+        // Реализуйте кнопки перехода в активити с фрагментами в MainActivity.
+        findViewById<Button>(R.id.btn_open_ActivityB).setOnClickListener {
+            startActivity(Intent(this, ActivityB::class.java))
+        }
     }
 }
\ 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..a80e0be
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout 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:orientation="vertical"
+    tools:context=".ActivityA">
+
+    <TextView
+        android:id="@+id/textView3"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Activity A"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/container_FragmentA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@android:color/transparent" />
+
+</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..2e482fa
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout 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"
+    tools:context=".ActivityB">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/frameLayout_ba"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_weight="1"
+        />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/frameLayout_bb"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_weight="1"
+        />
+
+</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..6c91913 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -6,13 +6,27 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
+    <Button
+        android:id="@+id/btn_open_ActivityA"
+        android:layout_width="200dp"
+        android:layout_height="48dp"
+        android:layout_marginBottom="44dp"
+        android:text="Open Activity A"
+        app:layout_constraintBottom_toTopOf="@+id/btn_open_ActivityB"
+        app:layout_constraintHorizontal_bias="0.502"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent" />
+
+    <Button
+        android:id="@+id/btn_open_ActivityB"
+        android:layout_width="200dp"
+        android:layout_height="48dp"
+        android:text="Open Activity B"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintHorizontal_bias="0.497"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.407" />
 
 </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..7326b10
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,28 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Fragment A"
+        android:textAlignment="gravity"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large" />
+
+    <Button
+        android:id="@+id/btn_open_FragmentAA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:layout_gravity="center_horizontal"
+        android:text="Open FragmentAA"
+        android:textAllCaps="false" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/layout_FragmentA"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@id/btn_open_FragmentAA" />
+</LinearLayout>
\ 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..69c302c
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,24 @@
+<?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">
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="Fragment AA"
+        android:textAlignment="gravity"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large" />
+
+    <Button
+        android:id="@+id/btn_open_FragmentAB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="Open FragmentAB"
+        android:textAllCaps="false" />
+
+</LinearLayout>
\ 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..aec90a2
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,16 @@
+<?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">
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="84dp"
+        android:text="Fragment AB"
+        android:textAlignment="gravity"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"
+        android:visibility="visible" />
+
+</LinearLayout>
\ 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..6edf981
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,23 @@
+<?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="vertical">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="top|left"
+        android:text="Fragment BA"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large" />
+
+    <Button
+        android:id="@+id/btn_open_FragmentBB"
+        style="@style/Widget.AppCompat.Button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="Open FragmentBB"
+        android:textAllCaps="false" />
+
+</FrameLayout>
\ 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..73bd08f
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,22 @@
+<?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="vertical">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:text="Fragment BB"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large" />
+
+    <Button
+        android:id="@+id/btn_SendColor"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="SendColor"
+        android:textAllCaps="false" />
+
+</FrameLayout>
\ No newline at end of file