From 6c32be024154b5ae92699a48fd5d2b9b941d4328 Mon Sep 17 00:00:00 2001
From: xenia <xenia@test.ru>
Date: Sat, 6 Dec 2025 20:41:52 +0300
Subject: [PATCH 1/3] TASK 0

---
 app/build.gradle                              |  1 +
 app/src/main/AndroidManifest.xml              |  6 +++++
 .../otus/gpb/homework/fragments/Activity1.kt  | 26 +++++++++++++++++++
 .../otus/gpb/homework/fragments/Activity2.kt  | 26 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentA.kt  | 18 +++++++++++++
 .../otus/gpb/homework/fragments/FragmentB.kt  | 19 ++++++++++++++
 .../gpb/homework/fragments/MainActivity.kt    | 15 +++++++++++
 app/src/main/res/layout/activity_1.xml        | 15 +++++++++++
 app/src/main/res/layout/activity_2.xml        | 15 +++++++++++
 app/src/main/res/layout/activity_main.xml     | 18 ++++++++++---
 app/src/main/res/layout/fragment_a.xml        | 14 ++++++++++
 app/src/main/res/layout/fragment_b.xml        | 14 ++++++++++
 app/src/main/res/values/strings.xml           |  5 ++++
 13 files changed, 189 insertions(+), 3 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/Activity1.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/Activity2.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
 create mode 100644 app/src/main/res/layout/activity_1.xml
 create mode 100644 app/src/main/res/layout/activity_2.xml
 create mode 100644 app/src/main/res/layout/fragment_a.xml
 create mode 100644 app/src/main/res/layout/fragment_b.xml

diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..70ba3b5 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:1.8.0'
     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..ca775ee 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=".Activity2"
+            android:exported="false" />
+        <activity
+            android:name=".Activity1"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Activity1.kt b/app/src/main/java/otus/gpb/homework/fragments/Activity1.kt
new file mode 100644
index 0000000..ee0ad65
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Activity1.kt
@@ -0,0 +1,26 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class Activity1 : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_1)
+        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
+        }
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragment_a, FragmentA())
+            .setReorderingAllowed(true)
+            .commit()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Activity2.kt b/app/src/main/java/otus/gpb/homework/fragments/Activity2.kt
new file mode 100644
index 0000000..05167ec
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Activity2.kt
@@ -0,0 +1,26 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class Activity2 : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_2)
+        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
+        }
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragment_b, FragmentB())
+            .setReorderingAllowed(true)
+            .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..ad0fa0f
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,18 @@
+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
+
+class FragmentA : Fragment() {
+
+    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)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
new file mode 100644
index 0000000..fbd69e0
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
@@ -0,0 +1,19 @@
+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
+
+
+class FragmentB : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_b, container, false)
+    }
+}
\ 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..276421b 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 +10,18 @@ class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        val button1 = findViewById<Button>(R.id.btn_open_activity1)
+        val button2 = findViewById<Button>(R.id.btn_open_activity2)
+
+        button1.setOnClickListener {
+            val intent = Intent(this, Activity1::class.java)
+            startActivity(intent)
+        }
+
+        button2.setOnClickListener {
+            val intent = Intent(this, Activity2::class.java)
+            startActivity(intent)
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_1.xml b/app/src/main/res/layout/activity_1.xml
new file mode 100644
index 0000000..fa5e9ff
--- /dev/null
+++ b/app/src/main/res/layout/activity_1.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=".Activity1">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_a"
+        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_2.xml b/app/src/main/res/layout/activity_2.xml
new file mode 100644
index 0000000..3273d70
--- /dev/null
+++ b/app/src/main/res/layout/activity_2.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=".Activity2">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_b"
+        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_main.xml b/app/src/main/res/layout/activity_main.xml
index 17eab17..5fd49be 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -6,13 +6,25 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
+
+    <Button
+        android:id="@+id/btn_open_activity1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="@string/activity_1"
+        app:layout_constraintBottom_toTopOf="@id/btn_open_activity2"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <Button
+        android:id="@+id/btn_open_activity2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/activity_2"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btn_open_activity1" />
+
 </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..e8f0a2f
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.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=".FragmentA">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:text="@string/fragment_a" />
+
+</FrameLayout>
\ 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..c5d8f63
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b.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=".FragmentB">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:text="@string/fragment_b" />
+
+</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..1445e73 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,8 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <!-- TODO: Remove or change this placeholder text -->
+    <string name="fragment_a">FRAGMENT A</string>
+    <string name="fragment_b">FRAGMENT B</string>
+    <string name="activity_2">Activity 2</string>
+    <string name="activity_1">Activity 1</string>
 </resources>
\ No newline at end of file

From b6ae82bfdde207fddc20050be2dc9e58129d4af6 Mon Sep 17 00:00:00 2001
From: xenia <xenia@test.ru>
Date: Tue, 9 Dec 2025 14:10:39 +0300
Subject: [PATCH 2/3] TASK 1

---
 .../otus/gpb/homework/fragments/FragmentA.kt  | 33 +++++++++++
 .../otus/gpb/homework/fragments/FragmentAA.kt | 56 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentAB.kt | 44 +++++++++++++++
 app/src/main/res/layout/fragment_a.xml        | 35 ++++++++++--
 app/src/main/res/layout/fragment_a_a.xml      | 29 ++++++++++
 app/src/main/res/layout/fragment_a_b.xml      | 14 +++++
 app/src/main/res/values/strings.xml           |  2 +
 7 files changed, 208 insertions(+), 5 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
 create mode 100644 app/src/main/res/layout/fragment_a_a.xml
 create mode 100644 app/src/main/res/layout/fragment_a_b.xml

diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
index ad0fa0f..c1fa385 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -1,13 +1,31 @@
 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{
+                    requireActivity().finish()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, callback)
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
@@ -15,4 +33,19 @@ class FragmentA : Fragment() {
         // 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)
+
+        val btnFragmentAA = view.findViewById<Button>(R.id.btn_open_fragmentAA)
+
+        btnFragmentAA.setOnClickListener {
+            val color = ColorGenerator.generateColor()
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_aa_container, FragmentAA.newInstance(color))
+                .setReorderingAllowed(true)
+                .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..edb85ef
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,56 @@
+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
+
+private const val ARG_BCK_COLOR = "background_color"
+
+class FragmentAA : Fragment() {
+    private var backgroundColor: Int? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            backgroundColor = it.getInt(ARG_BCK_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)
+
+        backgroundColor?.let { backgroundColor -> view.setBackgroundColor(backgroundColor) }
+
+        val btnFragmentAB = view.findViewById<Button>(R.id.btn_open_fragmentAB)
+
+        btnFragmentAB.setOnClickListener {
+            val color = ColorGenerator.generateColor()
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.fragment_aa_container, FragmentAB.newInstance(color))
+                .setReorderingAllowed(true)
+                .addToBackStack("")
+                .commit()
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(bckColor: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(ARG_BCK_COLOR, bckColor)
+                }
+            }
+    }
+}
\ 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..d18cdc1
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,44 @@
+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
+
+private const val ARG_BCK_COLOR = "background_color"
+
+class FragmentAB : Fragment() {
+    private var backgroundColor: Int? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            backgroundColor = it.getInt(ARG_BCK_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)
+
+        backgroundColor?.let { backgroundColor -> view.setBackgroundColor(backgroundColor) }
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(bckColor: Int) =
+            FragmentAB().apply {
+                arguments = Bundle().apply {
+                    putInt(ARG_BCK_COLOR, bckColor)
+                }
+            }
+    }
+}
\ 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
index e8f0a2f..7b9b6b1 100644
--- a/app/src/main/res/layout/fragment_a.xml
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -1,14 +1,39 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<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:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".FragmentA">
 
     <TextView
+        android:id="@+id/fragment_a_label"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_a"
+        app:layout_constraintBottom_toTopOf="@id/btn_open_fragmentAA"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/btn_open_fragmentAA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_aa"
+        app:layout_constraintBottom_toTopOf="@id/fragment_aa_container"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/fragment_a_label" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_aa_container"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:gravity="center"
-        android:text="@string/fragment_a" />
+        android:layout_height="500dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btn_open_fragmentAA" />
+
 
-</FrameLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ 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..f50a7a2
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a_a.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    tools:context=".FragmentAA">
+
+    <TextView
+        android:id="@+id/fragment_aa_label"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_aa"
+        app:layout_constraintBottom_toTopOf="@id/btn_open_fragmentAB"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/btn_open_fragmentAB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_ab"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/fragment_aa_label" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ 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..165428e
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a_b.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=".FragmentAB">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:text="@string/fragment_ab" />
+
+</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 1445e73..135f1d7 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -5,4 +5,6 @@
     <string name="fragment_b">FRAGMENT B</string>
     <string name="activity_2">Activity 2</string>
     <string name="activity_1">Activity 1</string>
+    <string name="fragment_aa">FRAGMENT AA</string>
+    <string name="fragment_ab">FRAGMENT AB</string>
 </resources>
\ No newline at end of file

From 54a7f7b29244d4e48aa2425148dbb7925df2a33b Mon Sep 17 00:00:00 2001
From: xenia <xenia@test.ru>
Date: Tue, 9 Dec 2025 16:03:19 +0300
Subject: [PATCH 3/3] TASK 2

---
 .../otus/gpb/homework/fragments/FragmentAB.kt |  1 -
 .../otus/gpb/homework/fragments/FragmentB.kt  | 21 ++++++++-
 .../otus/gpb/homework/fragments/FragmentBA.kt | 46 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentBB.kt | 41 +++++++++++++++++
 .../fragments/FragmentResultExtensions.kt     | 21 +++++++++
 app/src/main/res/layout-land/fragment_b.xml   | 25 ++++++++++
 app/src/main/res/layout/fragment_b.xml        | 14 ++++--
 app/src/main/res/layout/fragment_b_a.xml      | 29 ++++++++++++
 app/src/main/res/layout/fragment_b_b.xml      | 29 ++++++++++++
 app/src/main/res/values/strings.xml           |  3 ++
 10 files changed, 223 insertions(+), 7 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentResultExtensions.kt
 create mode 100644 app/src/main/res/layout-land/fragment_b.xml
 create mode 100644 app/src/main/res/layout/fragment_b_a.xml
 create mode 100644 app/src/main/res/layout/fragment_b_b.xml

diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
index d18cdc1..16fb57a 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -28,7 +28,6 @@ class FragmentAB : Fragment() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-
         backgroundColor?.let { backgroundColor -> view.setBackgroundColor(backgroundColor) }
     }
 
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
index fbd69e0..5bf8edc 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
@@ -1,12 +1,12 @@
 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
 
-
 class FragmentB : Fragment() {
 
     override fun onCreateView(
@@ -16,4 +16,23 @@ class FragmentB : Fragment() {
         // Inflate the layout for this fragment
         return inflater.inflate(R.layout.fragment_b, container, false)
     }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        val orientation = requireActivity().resources.configuration.orientation
+
+        if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.container_fragment_ba, FragmentBA())
+                .replace(R.id.container_fragment_bb, FragmentBB())
+                .setReorderingAllowed(true)
+                .commit()
+        } else {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.container_fragment_ba, FragmentBA())
+                .setReorderingAllowed(true)
+                .commit()
+        }
+    }
 }
\ 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..4173de3
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,46 @@
+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 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)
+
+        observeResult { color ->
+            view.setBackgroundColor(color)
+        }
+
+        val orientation = requireActivity().resources.configuration.orientation
+
+        val btnFragmentBb = view.findViewById<Button>(R.id.btn_open_fragmentBB)
+
+        if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            btnFragmentBb.visibility = View.GONE
+        } else {
+            btnFragmentBb.visibility = View.VISIBLE
+
+            btnFragmentBb.setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.container_fragment_ba, FragmentBB())
+                    .setReorderingAllowed(true)
+                    .addToBackStack("")
+                    .commit()
+            }
+        }
+    }
+}
\ 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..07b949b
--- /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.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)
+
+        val orientation = requireActivity().resources.configuration.orientation
+
+        val btnSendColor = view.findViewById<Button>(R.id.btn_send_color)
+
+        if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            btnSendColor.setOnClickListener {
+                val color = ColorGenerator.generateColor()
+                sendResult(color = color)
+            }
+        } else {
+            btnSendColor.setOnClickListener {
+                val color = ColorGenerator.generateColor()
+                sendResult(color = color)
+                parentFragmentManager.popBackStack()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentResultExtensions.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentResultExtensions.kt
new file mode 100644
index 0000000..f051c2e
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentResultExtensions.kt
@@ -0,0 +1,21 @@
+package otus.gpb.homework.fragments
+
+import androidx.core.os.bundleOf
+import androidx.fragment.app.Fragment
+
+private const val REQUEST_KEY = "fragment_bb_request_key"
+private const val RESULT_BUNDLE_KEY = "fragment_bb_result_bundle_key"
+
+fun Fragment.sendResult(color: Int) {
+    parentFragmentManager.setFragmentResult(
+        REQUEST_KEY,
+        bundleOf(RESULT_BUNDLE_KEY to color)
+    )
+}
+
+fun Fragment.observeResult(callback: (Int) -> Unit) {
+    parentFragmentManager.setFragmentResultListener(REQUEST_KEY, this) { _, result ->
+        val backgroundColor = result.getInt(RESULT_BUNDLE_KEY)
+        callback(backgroundColor)
+    }
+}
\ 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..bdd038c
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_b.xml
@@ -0,0 +1,25 @@
+<?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"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/container_fragment_ba"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/container_fragment_bb"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/container_fragment_bb"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@id/container_fragment_ba"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_b.xml b/app/src/main/res/layout/fragment_b.xml
index c5d8f63..00f022f 100644
--- a/app/src/main/res/layout/fragment_b.xml
+++ b/app/src/main/res/layout/fragment_b.xml
@@ -1,14 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<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:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".FragmentB">
 
-    <TextView
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/container_fragment_ba"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:gravity="center"
-        android:text="@string/fragment_b" />
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
 
-</FrameLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ 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..d9b42c4
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b_a.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    tools:context=".FragmentBA">
+
+    <TextView
+        android:id="@+id/fragment_ba_label"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_ba"
+        app:layout_constraintBottom_toTopOf="@id/btn_open_fragmentBB"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/btn_open_fragmentBB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_bb"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/fragment_ba_label" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ 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..3381117
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b_b.xml
@@ -0,0 +1,29 @@
+<?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:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentBB">
+
+    <TextView
+        android:id="@+id/fragment_bb_label"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_bb"
+        app:layout_constraintBottom_toTopOf="@id/btn_send_color"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/btn_send_color"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/send_color"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/fragment_bb_label" />
+
+</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 135f1d7..f781c47 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -7,4 +7,7 @@
     <string name="activity_1">Activity 1</string>
     <string name="fragment_aa">FRAGMENT AA</string>
     <string name="fragment_ab">FRAGMENT AB</string>
+    <string name="fragment_ba">FRAGMENT BA</string>
+    <string name="fragment_bb">FRAGMENT BB</string>
+    <string name="send_color">Send color</string>
 </resources>
\ No newline at end of file