From d3f6fac98542f50959dcae3d6e3f83f1bc9bd218 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=90=D0=BB=D1=8C=D0=B1=D0=B5=D1=80=D1=82?=
 <rubberbigpepper@gmail.com>
Date: Sun, 16 Mar 2025 14:08:19 +0500
Subject: [PATCH 1/2] Task 0-1

---
 app/build.gradle                              |  8 +-
 app/src/main/AndroidManifest.xml              |  6 ++
 .../gpb/homework/fragments/ColorGenerator.kt  |  4 +-
 .../gpb/homework/fragments/MainActivity.kt    | 13 +++
 .../gpb/homework/fragments/ui/ActivityA.kt    | 24 ++++++
 .../gpb/homework/fragments/ui/ActivityB.kt    | 21 +++++
 .../gpb/homework/fragments/ui/FragmentA.kt    | 80 +++++++++++++++++++
 .../gpb/homework/fragments/ui/FragmentAA.kt   | 55 +++++++++++++
 .../gpb/homework/fragments/ui/FragmentAB.kt   | 42 ++++++++++
 app/src/main/res/layout/activity_a.xml        | 15 ++++
 app/src/main/res/layout/activity_b.xml        | 10 +++
 app/src/main/res/layout/activity_main.xml     | 21 ++++-
 app/src/main/res/layout/fragment_a.xml        | 17 ++++
 app/src/main/res/layout/fragment_aa.xml       | 15 ++++
 app/src/main/res/layout/fragment_ab.xml       | 14 ++++
 app/src/main/res/values/strings.xml           |  6 ++
 16 files changed, 340 insertions(+), 11 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/ActivityA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAB.kt
 create mode 100644 app/src/main/res/layout/activity_a.xml
 create mode 100644 app/src/main/res/layout/activity_b.xml
 create mode 100644 app/src/main/res/layout/fragment_a.xml
 create mode 100644 app/src/main/res/layout/fragment_aa.xml
 create mode 100644 app/src/main/res/layout/fragment_ab.xml

diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..7976d9d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,12 +3,8 @@ plugins {
     id 'org.jetbrains.kotlin.android'
 }
 
-kotlin {
-    jvmToolchain(17)
-}
-
 android {
-    compileSdk 34
+    compileSdk 35
     namespace "otus.gpb.homework.fragments"
 
     defaultConfig {
@@ -42,6 +38,8 @@ 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:1.10.1'
+    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'
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9604b34..5b4cb53 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=".ui.ActivityB"
+            android:exported="false" />
+        <activity
+            android:name=".ui.ActivityA"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ColorGenerator.kt b/app/src/main/java/otus/gpb/homework/fragments/ColorGenerator.kt
index 3a4a5ac..b5c1517 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/ColorGenerator.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/ColorGenerator.kt
@@ -1,13 +1,13 @@
 package otus.gpb.homework.fragments
 
-import android.graphics.Color
 import java.util.Random
+import androidx.core.graphics.toColorInt
 
 object ColorGenerator {
 
     fun generateColor(): Int {
         val nextInt = Random().nextInt(0xffffff + 1)
         val colorCode = String.format("#%06x", nextInt)
-        return Color.parseColor(colorCode)
+        return colorCode.toColorInt()
     }
 }
\ 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..d726baf 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 +1,25 @@
 package otus.gpb.homework.fragments
 
 import android.os.Bundle
+import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
+import otus.gpb.homework.fragments.ui.ActivityA
+import otus.gpb.homework.fragments.ui.ActivityB
+import android.content.Intent
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        findViewById<Button>(R.id.buttonOpenActivityA).setOnClickListener{
+            startActivity(Intent(this@MainActivity, ActivityA::class.java))
+        }
+
+        findViewById<Button>(R.id.buttonOpenActivityB).setOnClickListener{
+            startActivity(Intent(this@MainActivity, ActivityB::class.java))
+        }
     }
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityA.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityA.kt
new file mode 100644
index 0000000..cadf303
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityA.kt
@@ -0,0 +1,24 @@
+package otus.gpb.homework.fragments.ui
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import otus.gpb.homework.fragments.R
+
+class ActivityA : AppCompatActivity() {
+    private lateinit var fragmentA: FragmentA
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_a)
+
+        if (savedInstanceState == null) {
+            fragmentA = FragmentA()
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_container, fragmentA, "fragmentA")
+                .commit()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt
new file mode 100644
index 0000000..147157c
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt
@@ -0,0 +1,21 @@
+package otus.gpb.homework.fragments.ui
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import otus.gpb.homework.fragments.R
+
+class ActivityB : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_b)
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt
new file mode 100644
index 0000000..d3878fa
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt
@@ -0,0 +1,80 @@
+package otus.gpb.homework.fragments.ui
+
+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
+import otus.gpb.homework.fragments.ColorGenerator
+import otus.gpb.homework.fragments.R
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentA : Fragment() {
+
+    private lateinit var openButton: Button
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        val rootView = inflater.inflate(R.layout.fragment_a, container, false)
+        openButton = rootView.findViewById(R.id.buttonOpenAA)
+        rootView.findViewById<Button>(R.id.buttonOpenAA).setOnClickListener {
+            val color = ColorGenerator.generateColor()
+            val fragmentAA = FragmentAA.newInstance(color)
+            childFragmentManager.beginTransaction()
+                .replace(R.id.container, fragmentAA, "fragmentAA")
+                .addToBackStack("fragmentAA")
+                .commit()
+            openButton.visibility = View.GONE
+        }
+        return rootView
+    }
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 0) {
+                    childFragmentManager.popBackStack()
+                    if (childFragmentManager.backStackEntryCount == 1)
+                        openButton.visibility = View.VISIBLE
+                } else {
+                    requireActivity().finish()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(callback)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        setFragmentResultListener(SHOW_FRAGMENT_AB) { _, _ ->
+            val color = ColorGenerator.generateColor()
+            val fragmentAB = FragmentAB.newInstance(color)
+            childFragmentManager.beginTransaction()
+                .replace(R.id.container, fragmentAB, "fragmentAB")
+                .addToBackStack("fragmentAB")
+                .commit()
+            openButton.visibility = View.GONE
+        }
+    }
+
+
+    companion object{
+        const val SHOW_FRAGMENT_AB = "show fragmentAB"
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt
new file mode 100644
index 0000000..68eb03b
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt
@@ -0,0 +1,55 @@
+package otus.gpb.homework.fragments.ui
+
+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 otus.gpb.homework.fragments.R
+import androidx.core.graphics.drawable.toDrawable
+import androidx.core.os.bundleOf
+import androidx.fragment.app.setFragmentResult
+import otus.gpb.homework.fragments.ColorGenerator
+
+private const val COLOR = "color"
+
+/**
+ * A simple [Fragment] subclass.
+ * Use the [FragmentAA.newInstance] factory method to
+ * create an instance of this fragment.
+ */
+class FragmentAA : Fragment() {
+    private var color: Int? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(COLOR)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        val rootView =  inflater.inflate(R.layout.fragment_aa, container, false)
+        rootView.background = color?.toDrawable()
+        rootView.findViewById<Button>(R.id.buttonOpenAB).setOnClickListener{
+            rootView.findViewById<Button>(R.id.buttonOpenAB).visibility = View.GONE
+            setFragmentResult(FragmentA.SHOW_FRAGMENT_AB, bundleOf())
+        }
+        return rootView
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(COLOR, color)
+                }
+            }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAB.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAB.kt
new file mode 100644
index 0000000..fd09ba4
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAB.kt
@@ -0,0 +1,42 @@
+package otus.gpb.homework.fragments.ui
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.core.graphics.drawable.toDrawable
+import otus.gpb.homework.fragments.R
+
+
+private const val COLOR = "color"
+
+class FragmentAB : Fragment() {
+    private var color: Int? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(COLOR)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        val rootView =  inflater.inflate(R.layout.fragment_aa, container, false)
+        rootView.background = color?.toDrawable()
+        return rootView
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(COLOR, color)
+                }
+            }
+    }
+}
\ 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..16b8e16
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.xml
@@ -0,0 +1,15 @@
+<?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"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.ActivityA">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_container"
+        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/activity_b.xml b/app/src/main/res/layout/activity_b.xml
new file mode 100644
index 0000000..4b245f7
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,10 @@
+<?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"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.ActivityB">
+
+</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..44ee43f 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -6,13 +6,26 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
+    <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:id="@+id/buttonOpenActivityA"
+        android:text="@string/open_activity_a"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/buttonOpenActivityB"
+        />
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:id="@+id/buttonOpenActivityB"
+        android:text="@string/open_activity_b"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/buttonOpenActivityA"
+        />
 
 </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..f0bf4f9
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,17 @@
+<?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/container"
+    tools:context=".ui.FragmentA">
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:id="@+id/buttonOpenAA"
+        android:text="@string/open_fragment_aa"
+        />
+
+</FrameLayout>
\ 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..222482c
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.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"
+    tools:context=".ui.FragmentAA">
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:id="@+id/buttonOpenAB"
+        android:text="@string/open_fragment_ab" />
+
+</FrameLayout>
\ 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..0378661
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,14 @@
+<?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"
+    tools:context=".ui.FragmentAB">
+
+    <!-- TODO: Update blank fragment layout -->
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="@string/hello_blank_fragment" />
+
+</FrameLayout>
\ 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..2eedb55 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,9 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <!-- TODO: Remove or change this placeholder text -->
+    <string name="hello_blank_fragment">Hello blank fragment</string>
+    <string name="open_fragment_aa">Open FragmentAA</string>
+    <string name="open_activity_a">Open Activity A</string>
+    <string name="open_activity_b">OpenActivityB</string>
+    <string name="open_fragment_ab">Open FragmentAB</string>
 </resources>
\ No newline at end of file

From ecd4ed0cbfea57fbe2f7190c7e2b409d657fd797 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=90=D0=BB=D1=8C=D0=B1=D0=B5=D1=80=D1=82?=
 <rubberbigpepper@gmail.com>
Date: Sun, 16 Mar 2025 16:50:26 +0500
Subject: [PATCH 2/2] Task 2

---
 .../gpb/homework/fragments/ui/ActivityB.kt    |  6 ++
 .../gpb/homework/fragments/ui/FragmentA.kt    |  2 +-
 .../gpb/homework/fragments/ui/FragmentAA.kt   |  5 --
 .../gpb/homework/fragments/ui/FragmentB.kt    | 62 +++++++++++++++++
 .../gpb/homework/fragments/ui/FragmentBA.kt   | 66 +++++++++++++++++++
 .../gpb/homework/fragments/ui/FragmentBB.kt   | 38 +++++++++++
 app/src/main/res/layout-land/fragment_b.xml   | 21 ++++++
 app/src/main/res/layout-land/fragment_ba.xml  |  8 +++
 app/src/main/res/layout/activity_b.xml        |  5 ++
 app/src/main/res/layout/fragment_b.xml        | 13 ++++
 app/src/main/res/layout/fragment_ba.xml       | 15 +++++
 app/src/main/res/layout/fragment_bb.xml       | 15 +++++
 app/src/main/res/values/strings.xml           |  8 ++-
 13 files changed, 255 insertions(+), 9 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/FragmentB.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBB.kt
 create mode 100644 app/src/main/res/layout-land/fragment_b.xml
 create mode 100644 app/src/main/res/layout-land/fragment_ba.xml
 create mode 100644 app/src/main/res/layout/fragment_b.xml
 create mode 100644 app/src/main/res/layout/fragment_ba.xml
 create mode 100644 app/src/main/res/layout/fragment_bb.xml

diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt
index 147157c..bcd2b7e 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/ActivityB.kt
@@ -17,5 +17,11 @@ class ActivityB : AppCompatActivity() {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
             insets
         }
+        if (savedInstanceState == null) {
+            val fragmentB = FragmentB()
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_container, fragmentB, "fragmentB")
+                .commit()
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt
index d3878fa..023f120 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentA.kt
@@ -62,7 +62,7 @@ class FragmentA : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        setFragmentResultListener(SHOW_FRAGMENT_AB) { _, _ ->
+        childFragmentManager.setFragmentResultListener(SHOW_FRAGMENT_AB, this) { _, _ ->
             val color = ColorGenerator.generateColor()
             val fragmentAB = FragmentAB.newInstance(color)
             childFragmentManager.beginTransaction()
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt
index 68eb03b..14d7307 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentAA.kt
@@ -14,11 +14,6 @@ import otus.gpb.homework.fragments.ColorGenerator
 
 private const val COLOR = "color"
 
-/**
- * A simple [Fragment] subclass.
- * Use the [FragmentAA.newInstance] factory method to
- * create an instance of this fragment.
- */
 class FragmentAA : Fragment() {
     private var color: Int? = null
 
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentB.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentB.kt
new file mode 100644
index 0000000..d049067
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentB.kt
@@ -0,0 +1,62 @@
+package otus.gpb.homework.fragments.ui
+
+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 androidx.activity.OnBackPressedCallback
+import otus.gpb.homework.fragments.ColorGenerator
+import otus.gpb.homework.fragments.R
+
+class FragmentB : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        val rootView = inflater.inflate(R.layout.fragment_b, container, false)
+        rootView.findViewById<View>(R.id.container)?.let {
+            createFragmentBA(it.id)
+        }
+        rootView.findViewById<View>(R.id.containerLeft)?.let {
+            createFragmentBA(it.id)
+        }
+        rootView.findViewById<View>(R.id.containerRight)?.let {
+            createFragmentBB(it.id)
+        }
+        return rootView
+    }
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 1) {
+                    childFragmentManager.popBackStack()
+                } else {
+                    requireActivity().finish()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(callback)
+    }
+
+    private fun createFragmentBA(containerId: Int){
+        val fragmentBA = FragmentBA()
+        childFragmentManager.beginTransaction()
+            .replace(containerId, fragmentBA, "fragmentBA")
+            .addToBackStack("fragmentBA")
+            .commit()
+    }
+
+    private fun createFragmentBB(containerId: Int){
+        val fragmentBB = FragmentBB()
+        childFragmentManager.beginTransaction()
+            .replace(containerId, fragmentBB, "fragmentBB")
+            .commit()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBA.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBA.kt
new file mode 100644
index 0000000..920d4e1
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBA.kt
@@ -0,0 +1,66 @@
+package otus.gpb.homework.fragments.ui
+
+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.core.graphics.drawable.toDrawable
+import otus.gpb.homework.fragments.ColorGenerator
+import otus.gpb.homework.fragments.R
+import otus.gpb.homework.fragments.ui.FragmentA.Companion.SHOW_FRAGMENT_AB
+
+private const val COLOR = "color"
+
+class FragmentBA : Fragment() {
+    private var color: Int? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(COLOR)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        val rootView = inflater.inflate(R.layout.fragment_ba, container, false)
+        rootView.findViewById<Button>(R.id.buttonOpenBB)?.let { button ->
+            button.setOnClickListener {
+                createFragmentBB()
+                button.visibility = View.GONE
+            }
+        }
+        return rootView
+    }
+
+    private fun createFragmentBB(){
+        val fragmentBB = FragmentBB.newInstance()
+        parentFragmentManager.beginTransaction()
+            .replace(R.id.container, fragmentBB, "fragmentBB")
+            .addToBackStack("fragmentBB")
+            .commit()
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        parentFragmentManager.setFragmentResultListener(FragmentBB.SEND_COLOR, this) { _, bundle ->
+            val color = bundle.getInt(FragmentBB.COLOR)
+            view.background = color.toDrawable()
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(COLOR, color)
+                }
+            }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBB.kt b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBB.kt
new file mode 100644
index 0000000..998f7a6
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ui/FragmentBB.kt
@@ -0,0 +1,38 @@
+package otus.gpb.homework.fragments.ui
+
+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.core.os.bundleOf
+import androidx.fragment.app.setFragmentResult
+import otus.gpb.homework.fragments.ColorGenerator
+import otus.gpb.homework.fragments.R
+
+class FragmentBB : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        val rootView = inflater.inflate(R.layout.fragment_bb, container, false)
+        rootView.findViewById<Button>(R.id.buttonSendColor).setOnClickListener {
+            parentFragmentManager.setFragmentResult(
+                SEND_COLOR,
+                bundleOf(COLOR to ColorGenerator.generateColor())
+            )
+        }
+        return rootView
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance() = FragmentBB()
+
+        const val SEND_COLOR = "sendColor"
+        const val COLOR = "color"
+    }
+}
\ 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..b2bc9a4
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_b.xml
@@ -0,0 +1,21 @@
+<?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="horizontal"
+    tools:context=".ui.FragmentB">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/containerLeft"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1"/>
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/containerRight"
+        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..383f95f
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_ba.xml
@@ -0,0 +1,8 @@
+<?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"
+    tools:context=".ui.FragmentBA">
+
+</FrameLayout>
\ 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
index 4b245f7..22c73cb 100644
--- a/app/src/main/res/layout/activity_b.xml
+++ b/app/src/main/res/layout/activity_b.xml
@@ -7,4 +7,9 @@
     android:layout_height="match_parent"
     tools:context=".ui.ActivityB">
 
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_container"
+        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_b.xml b/app/src/main/res/layout/fragment_b.xml
new file mode 100644
index 0000000..609eafe
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b.xml
@@ -0,0 +1,13 @@
+<?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"
+    tools:context=".ui.FragmentB">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/container"
+        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_ba.xml b/app/src/main/res/layout/fragment_ba.xml
new file mode 100644
index 0000000..40b6fab
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.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"
+    tools:context=".ui.FragmentBA">
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:id="@+id/buttonOpenBB"
+        android:text="@string/open_fragment_bb" />
+
+</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..dc00e72
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.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"
+    tools:context=".ui.FragmentBB">
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:id="@+id/buttonSendColor"
+        android:text="@string/send_color" />
+
+</FrameLayout>
\ 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 2eedb55..fa8836f 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -2,8 +2,10 @@
     <string name="app_name">Fragments</string>
     <!-- TODO: Remove or change this placeholder text -->
     <string name="hello_blank_fragment">Hello blank fragment</string>
-    <string name="open_fragment_aa">Open FragmentAA</string>
+    <string name="open_fragment_aa">Open Fragment AA</string>
     <string name="open_activity_a">Open Activity A</string>
-    <string name="open_activity_b">OpenActivityB</string>
-    <string name="open_fragment_ab">Open FragmentAB</string>
+    <string name="open_activity_b">Open Activity B</string>
+    <string name="open_fragment_ab">Open Fragment AB</string>
+    <string name="open_fragment_bb">Open fragment BB</string>
+    <string name="send_color">Send color</string>
 </resources>
\ No newline at end of file