From 0b9297097a87ff51e51193911f64c33b72cb44fd Mon Sep 17 00:00:00 2001
From: Anv0l <andrei.voloshin@live.com>
Date: Sat, 26 Apr 2025 15:04:40 +0300
Subject: [PATCH 1/5] =?UTF-8?q?=D0=A1=D0=B4=D0=B5=D0=BB=D0=B0=D0=BB=20?=
 =?UTF-8?q?=D0=B7=D0=B0=D0=B4=D0=B0=D0=BD=D0=B8=D0=B5=20=E2=84=961?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/build.gradle                              | 26 +++----
 .../java/otus/gpb/homework/fragments/Const.kt |  6 ++
 .../otus/gpb/homework/fragments/FragmentA.kt  | 72 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentAA.kt | 27 +++++++
 .../otus/gpb/homework/fragments/FragmentB.kt  | 19 +++++
 .../gpb/homework/fragments/MainActivity.kt    | 26 +++++++
 app/src/main/res/layout/activity_main.xml     | 40 +++++++++--
 app/src/main/res/layout/fragment_a.xml        | 38 ++++++++++
 app/src/main/res/layout/fragment_aa.xml       | 19 +++++
 app/src/main/res/layout/fragment_ab.xml       |  6 ++
 app/src/main/res/layout/fragment_b.xml        | 17 +++++
 11 files changed, 280 insertions(+), 16 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/Const.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/FragmentAA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
 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
 create mode 100644 app/src/main/res/layout/fragment_b.xml

diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..66b055d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -4,17 +4,17 @@ plugins {
 }
 
 kotlin {
-    jvmToolchain(17)
+    jvmToolchain(20)
 }
 
 android {
-    compileSdk 34
+    compileSdk 35
     namespace "otus.gpb.homework.fragments"
 
     defaultConfig {
         applicationId "otus.gpb.homework.fragments"
         minSdk 26
-        targetSdk 34
+        targetSdk 35
         versionCode 1
         versionName "1.0"
 
@@ -28,21 +28,23 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_17
+        sourceCompatibility JavaVersion.VERSION_20
+        targetCompatibility JavaVersion.VERSION_20
     }
     kotlinOptions {
-        jvmTarget = '17'
+        jvmTarget = '20'
     }
 }
 
 dependencies {
 
-    implementation 'androidx.core:core-ktx:1.7.0'
-    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.core:core-ktx:1.16.0"
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'com.google.android.material:material:1.12.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.2.1'
+    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'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Const.kt b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
new file mode 100644
index 0000000..b128b32
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
@@ -0,0 +1,6 @@
+package otus.gpb.homework.fragments
+
+const val RESULT_KEY_A = "key_color_a"
+const val RESULT_KEY_A_A = "key_color_a_a"
+const val RESUlT_BUNDLE = "bundle"
+
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..22cd9c9
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,72 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+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.core.os.bundleOf
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentA : Fragment() {
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 0) {
+                    childFragmentManager.popBackStack()
+                } else {
+                    isEnabled = false
+                    @Suppress("DEPRECATION")
+                    requireActivity().onBackPressed()
+                }
+            }
+        }
+
+        requireActivity().onBackPressedDispatcher.addCallback(callback)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.btn_open_fragment_aa).setOnClickListener {
+            val backgroundColor = ColorGenerator.generateColor()
+
+            childFragmentManager.setFragmentResult(
+                RESULT_KEY_A_A,
+                bundleOf(RESUlT_BUNDLE to backgroundColor)
+            )
+            childFragmentManager.popBackStackImmediate(
+                "fragmentA",
+                FragmentManager.POP_BACK_STACK_INCLUSIVE
+            )
+
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container_a, FragmentAA())
+                .addToBackStack("fragmentA")
+                .commit()
+        }
+
+        setFragmentResultListener(RESULT_KEY_A) { _, bundle ->
+            view.setBackgroundColor(bundle.getInt(RESUlT_BUNDLE))
+        }
+
+
+    }
+
+
+}
\ 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..cec3103
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,27 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentAA: Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_aa, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        view.setBackgroundColor(ColorGenerator.generateColor())
+        super.onViewCreated(view, savedInstanceState)
+
+        setFragmentResultListener(RESULT_KEY_A_A) {_,bundle ->
+            view.setBackgroundColor(bundle.getInt(RESUlT_BUNDLE))
+        }
+    }
+}
\ 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..86b34ec
--- /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 android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+
+class FragmentB : Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? = 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..c7611dc 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 +1,38 @@
 package otus.gpb.homework.fragments
 
 import android.os.Bundle
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.os.bundleOf
+import androidx.fragment.app.FragmentManager
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        findViewById<Button>(R.id.btn_open_fragment_a).setOnClickListener {
+            supportFragmentManager.popBackStackImmediate("fragmentA", FragmentManager.POP_BACK_STACK_INCLUSIVE)
+            val backgroundColor = ColorGenerator.generateColor()
+
+            supportFragmentManager.setFragmentResult(RESULT_KEY_A, bundleOf(RESUlT_BUNDLE to backgroundColor) )
+
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container, FragmentA())
+                .addToBackStack("fragmentA")
+                .commit()
+        }
+
+        findViewById<Button>(R.id.btn_open_fragment_b).setOnClickListener {
+            supportFragmentManager.popBackStackImmediate("fragmentB", FragmentManager.POP_BACK_STACK_INCLUSIVE)
+
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container, FragmentB())
+                .addToBackStack("fragmentB")
+                .commit()
+        }
     }
+
 }
\ 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..80c5401 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,15 +4,47 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:fitsSystemWindows="true"
     tools:context=".MainActivity">
 
-    <TextView
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/btn_open_fragment_a"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <androidx.constraintlayout.widget.Guideline
+        android:id="@+id/guideline"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:orientation="vertical"
+
+        app:layout_constraintGuide_percent="0.5" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_a"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="5dp"
+        android:layout_marginEnd="2.5dp"
+        android:layout_marginBottom="5dp"
+        android:text="Fragment A"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@id/guideline"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_b"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="2.5dp"
+        android:layout_marginEnd="5dp"
+        android:layout_marginBottom="5dp"
+        android:text="Fragment B"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintStart_toEndOf="@id/guideline" />
 
 </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..78898f0
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center_vertical"
+    android:orientation="vertical">
+
+    <TextView
+        android:id="@+id/txt_fragment_a_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="FragmentA"
+        android:textAlignment="center"
+        app:layout_constraintTop_toTopOf="parent"
+        android:textSize="26sp" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_aa"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_a_title"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginHorizontal="10dp"
+        android:text="Open fragment AA" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_a"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btn_open_fragment_aa"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
new file mode 100644
index 0000000..c90c6bb
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textSize="26sp"
+        android:text="Fragment AA"
+
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
new file mode 100644
index 0000000..77d9ef6
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,6 @@
+<?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">
+
+</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..0abd527
--- /dev/null
+++ b/app/src/main/res/layout/fragment_b.xml
@@ -0,0 +1,17 @@
+<?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">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="FragmentB"
+        android:textSize="26sp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

From 9dfd406dc98fdd93b52ccb654c14f1990a5877d7 Mon Sep 17 00:00:00 2001
From: Anv0l <andrei.voloshin@live.com>
Date: Sat, 26 Apr 2025 16:18:38 +0300
Subject: [PATCH 2/5] Fix

---
 .../otus/gpb/homework/fragments/FragmentA.kt  | 11 +------
 .../otus/gpb/homework/fragments/FragmentAA.kt | 33 +++++++++++++++++--
 .../otus/gpb/homework/fragments/FragmentAB.kt | 27 +++++++++++++++
 .../gpb/homework/fragments/MainActivity.kt    |  4 ---
 app/src/main/res/layout-land/fragment_b.xml   | 21 ++++++++++++
 app/src/main/res/layout/fragment_aa.xml       | 12 ++++++-
 app/src/main/res/layout/fragment_ab.xml       | 13 +++++++-
 app/src/main/res/layout/fragment_ba.xml       | 12 +++++++
 8 files changed, 114 insertions(+), 19 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
 create mode 100644 app/src/main/res/layout-land/fragment_b.xml
 create mode 100644 app/src/main/res/layout/fragment_ba.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 22cd9c9..9fbd6eb 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -10,7 +10,6 @@ import androidx.activity.OnBackPressedCallback
 import androidx.core.os.bundleOf
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentManager
-import androidx.fragment.app.setFragmentResultListener
 
 class FragmentA : Fragment() {
 
@@ -47,7 +46,7 @@ class FragmentA : Fragment() {
             val backgroundColor = ColorGenerator.generateColor()
 
             childFragmentManager.setFragmentResult(
-                RESULT_KEY_A_A,
+                RESULT_KEY_A,
                 bundleOf(RESUlT_BUNDLE to backgroundColor)
             )
             childFragmentManager.popBackStackImmediate(
@@ -60,13 +59,5 @@ class FragmentA : Fragment() {
                 .addToBackStack("fragmentA")
                 .commit()
         }
-
-        setFragmentResultListener(RESULT_KEY_A) { _, bundle ->
-            view.setBackgroundColor(bundle.getInt(RESUlT_BUNDLE))
-        }
-
-
     }
-
-
 }
\ 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
index cec3103..5da3e83 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -1,27 +1,54 @@
 package otus.gpb.homework.fragments
 
+import android.graphics.Color
 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 androidx.fragment.app.setFragmentResultListener
 
 class FragmentAA: Fragment() {
+    private val SAVED_COLOR = "saved_color"
+    private var savedBackgroundColor: Int = ColorGenerator.generateColor()
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
+        savedBackgroundColor = savedInstanceState?.getInt(SAVED_COLOR) ?: savedBackgroundColor
         return inflater.inflate(R.layout.fragment_aa, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        view.setBackgroundColor(ColorGenerator.generateColor())
         super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(savedBackgroundColor)
+
+        view.findViewById<Button>(R.id.btn_open_fragment_ab).setOnClickListener {
+            val backgroundColor = ColorGenerator.generateColor()
 
-        setFragmentResultListener(RESULT_KEY_A_A) {_,bundle ->
-            view.setBackgroundColor(bundle.getInt(RESUlT_BUNDLE))
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container_a, FragmentAB())
+                .addToBackStack("fragmentAB")
+                .commit()
+
+            parentFragmentManager.setFragmentResult(
+                RESULT_KEY_A_A,
+                bundleOf(RESUlT_BUNDLE to backgroundColor)
+            )
         }
+
+        setFragmentResultListener(RESULT_KEY_A) { _, bundle ->
+            savedBackgroundColor = bundle.getInt(RESUlT_BUNDLE)
+            view.setBackgroundColor(savedBackgroundColor)
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putInt(SAVED_COLOR, savedBackgroundColor)
     }
 }
\ 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..ad0bd39
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,27 @@
+package otus.gpb.homework.fragments
+
+import android.graphics.Color
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentAB: Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ab, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        setFragmentResultListener(RESULT_KEY_A_A) { _, bundle ->
+            view.setBackgroundColor(bundle.getInt(RESUlT_BUNDLE))
+        }
+    }
+}
\ 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 c7611dc..fa7ccbc 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -2,7 +2,6 @@ package otus.gpb.homework.fragments
 
 import android.os.Bundle
 import android.widget.Button
-import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.os.bundleOf
 import androidx.fragment.app.FragmentManager
@@ -15,9 +14,6 @@ class MainActivity : AppCompatActivity() {
 
         findViewById<Button>(R.id.btn_open_fragment_a).setOnClickListener {
             supportFragmentManager.popBackStackImmediate("fragmentA", FragmentManager.POP_BACK_STACK_INCLUSIVE)
-            val backgroundColor = ColorGenerator.generateColor()
-
-            supportFragmentManager.setFragmentResult(RESULT_KEY_A, bundleOf(RESUlT_BUNDLE to backgroundColor) )
 
             supportFragmentManager.beginTransaction()
                 .replace(R.id.fragment_view_container, FragmentA())
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..41b5dbf
--- /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"
+    android:layout_width="match_parent"
+    android:orientation="horizontal"
+    android:layout_height="match_parent">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_a"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1"
+        />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_b"
+        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/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
index c90c6bb..9f95b04 100644
--- a/app/src/main/res/layout/fragment_aa.xml
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -5,15 +5,25 @@
     android:layout_height="match_parent">
 
     <TextView
+        android:id="@+id/txt_fragment_aa_title"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:textSize="26sp"
         android:text="Fragment AA"
-
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toBottomOf="parent"
         />
 
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_ab"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_aa_title"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginHorizontal="10dp"
+        android:text="Open fragment AB" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
index 77d9ef6..c3f7fb0 100644
--- a/app/src/main/res/layout/fragment_ab.xml
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -1,6 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <TextView
+        android:id="@+id/txt_fragment_a_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="FragmentAB"
+        android:textAlignment="center"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:textSize="26sp" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ba.xml b/app/src/main/res/layout/fragment_ba.xml
new file mode 100644
index 0000000..694a78f
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <com.google.android.material.button.MaterialButton
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+
+        />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

From a0c52e17b5a910d22a485fe702952a383565b5d0 Mon Sep 17 00:00:00 2001
From: Anv0l <andrei.voloshin@live.com>
Date: Sat, 26 Apr 2025 16:20:27 +0300
Subject: [PATCH 3/5] Fix

---
 .../otus/gpb/homework/fragments/FragmentAA.kt |  1 -
 .../otus/gpb/homework/fragments/FragmentAB.kt |  1 -
 .../gpb/homework/fragments/MainActivity.kt    |  1 -
 app/src/main/res/layout/fragment_ba.xml       | 23 ++++++++++++++++---
 4 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
index 5da3e83..636e5bb 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -1,6 +1,5 @@
 package otus.gpb.homework.fragments
 
-import android.graphics.Color
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
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 ad0bd39..0b35b67 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -1,6 +1,5 @@
 package otus.gpb.homework.fragments
 
-import android.graphics.Color
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
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 fa7ccbc..6dc62ae 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -3,7 +3,6 @@ package otus.gpb.homework.fragments
 import android.os.Bundle
 import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.os.bundleOf
 import androidx.fragment.app.FragmentManager
 
 class MainActivity : AppCompatActivity() {
diff --git a/app/src/main/res/layout/fragment_ba.xml b/app/src/main/res/layout/fragment_ba.xml
index 694a78f..f0bce6b 100644
--- a/app/src/main/res/layout/fragment_ba.xml
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -1,12 +1,29 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
 
-    <com.google.android.material.button.MaterialButton
+    <TextView
+        android:id="@+id/txt_fragment_ba_title"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-
+        android:textSize="26sp"
+        android:text="Fragment BA"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
         />
 
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_open_fragment_bb"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_ba_title"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginHorizontal="10dp"
+        android:text="Open fragment BB" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

From 4bb42d3988fbe25a72207834e16d2a3193efaa36 Mon Sep 17 00:00:00 2001
From: Anv0l <andrei.voloshin@live.com>
Date: Sat, 26 Apr 2025 19:01:56 +0300
Subject: [PATCH 4/5] =?UTF-8?q?=D0=A1=D0=B4=D0=B5=D0=BB=D0=B0=D0=BB=20?=
 =?UTF-8?q?=D0=B7=D0=B0=D0=B4=D0=B0=D0=BD=D0=B8=D0=B5=20=E2=84=962?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/otus/gpb/homework/fragments/Const.kt |  4 +-
 .../otus/gpb/homework/fragments/FragmentA.kt  |  2 +-
 .../otus/gpb/homework/fragments/FragmentAA.kt |  6 +--
 .../otus/gpb/homework/fragments/FragmentAB.kt |  4 +-
 .../otus/gpb/homework/fragments/FragmentB.kt  | 30 ++++++++++++---
 .../otus/gpb/homework/fragments/FragmentBA.kt | 37 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentBB.kt | 37 +++++++++++++++++++
 .../otus/gpb/homework/fragments/Helper.kt     |  7 ++++
 .../gpb/homework/fragments/MainActivity.kt    | 10 ++++-
 app/src/main/res/layout-land/fragment_b.xml   | 15 ++++----
 app/src/main/res/layout-land/fragment_ba.xml  | 18 +++++++++
 app/src/main/res/layout/activity_main.xml     |  4 +-
 app/src/main/res/layout/fragment_a.xml        | 19 +++++-----
 app/src/main/res/layout/fragment_aa.xml       | 17 ++++-----
 app/src/main/res/layout/fragment_ab.xml       |  8 ++--
 app/src/main/res/layout/fragment_b.xml        | 17 +++------
 app/src/main/res/layout/fragment_ba.xml       | 21 +++++------
 app/src/main/res/layout/fragment_bb.xml       | 28 ++++++++++++++
 app/src/main/res/values-land/bools.xml        |  4 ++
 app/src/main/res/values/bools.xml             |  4 ++
 20 files changed, 221 insertions(+), 71 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/Helper.kt
 create mode 100644 app/src/main/res/layout-land/fragment_ba.xml
 create mode 100644 app/src/main/res/layout/fragment_bb.xml
 create mode 100644 app/src/main/res/values-land/bools.xml
 create mode 100644 app/src/main/res/values/bools.xml

diff --git a/app/src/main/java/otus/gpb/homework/fragments/Const.kt b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
index b128b32..44fd781 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/Const.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
@@ -2,5 +2,5 @@ package otus.gpb.homework.fragments
 
 const val RESULT_KEY_A = "key_color_a"
 const val RESULT_KEY_A_A = "key_color_a_a"
-const val RESUlT_BUNDLE = "bundle"
-
+const val RESULT_KEY_B = "key_color_b"
+const val RESULT_BUNDLE = "bundle"
\ 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
index 9fbd6eb..5b51b30 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -47,7 +47,7 @@ class FragmentA : Fragment() {
 
             childFragmentManager.setFragmentResult(
                 RESULT_KEY_A,
-                bundleOf(RESUlT_BUNDLE to backgroundColor)
+                bundleOf(RESULT_BUNDLE to backgroundColor)
             )
             childFragmentManager.popBackStackImmediate(
                 "fragmentA",
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
index 636e5bb..05c78a9 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -9,7 +9,7 @@ import androidx.core.os.bundleOf
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.setFragmentResultListener
 
-class FragmentAA: Fragment() {
+class FragmentAA : Fragment() {
     private val SAVED_COLOR = "saved_color"
     private var savedBackgroundColor: Int = ColorGenerator.generateColor()
 
@@ -36,12 +36,12 @@ class FragmentAA: Fragment() {
 
             parentFragmentManager.setFragmentResult(
                 RESULT_KEY_A_A,
-                bundleOf(RESUlT_BUNDLE to backgroundColor)
+                bundleOf(RESULT_BUNDLE to backgroundColor)
             )
         }
 
         setFragmentResultListener(RESULT_KEY_A) { _, bundle ->
-            savedBackgroundColor = bundle.getInt(RESUlT_BUNDLE)
+            savedBackgroundColor = bundle.getInt(RESULT_BUNDLE)
             view.setBackgroundColor(savedBackgroundColor)
         }
     }
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 0b35b67..1e9afc4 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -7,7 +7,7 @@ import android.view.ViewGroup
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.setFragmentResultListener
 
-class FragmentAB: Fragment() {
+class FragmentAB : Fragment() {
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
@@ -20,7 +20,7 @@ class FragmentAB: Fragment() {
         super.onViewCreated(view, savedInstanceState)
 
         setFragmentResultListener(RESULT_KEY_A_A) { _, bundle ->
-            view.setBackgroundColor(bundle.getInt(RESUlT_BUNDLE))
+            view.setBackgroundColor(bundle.getInt(RESULT_BUNDLE))
         }
     }
 }
\ 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
index 86b34ec..ec97763 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
@@ -6,14 +6,32 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
 
+
 class FragmentB : Fragment() {
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
-    ): View? = inflater.inflate(
-        R.layout.fragment_b,
-        container,
-        false
-    )
-}
\ No newline at end of file
+    ): View? {
+        return inflater.inflate(
+            R.layout.fragment_b,
+            container,
+            false
+        )
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        if (resources.getBoolean(R.bool.isLandscape)) {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_view_container_ba, FragmentBA())
+                .replace(R.id.fragment_view_container_bb, FragmentBB())
+                .commit()
+        } else {
+            childFragmentManager.beginTransaction()
+                .addToBackStack(null)
+                .replace(R.id.fragment_view_container_ba, FragmentBA())
+                .commit()
+        }
+        super.onViewCreated(view, savedInstanceState)
+    }
+}
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..075e8d3
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,37 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.setFragmentResultListener
+
+class FragmentBA : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ba, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        setFragmentResultListener(RESULT_KEY_B) { _, bundle ->
+            view.setBackgroundColor(bundle.getInt(RESULT_BUNDLE))
+        }
+
+        if (!requireContext().isLandscape()) {
+            view.findViewById<Button>(R.id.btn_open_fragment_bb).setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.fragment_view_container_ba, FragmentBB())
+                    .addToBackStack(null)
+                    .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..13d59c2
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,37 @@
+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.core.os.bundleOf
+import androidx.fragment.app.Fragment
+
+class FragmentBB : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_bb, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.btn_send_color_to_ba).setOnClickListener {
+            val backgroundColor = ColorGenerator.generateColor()
+
+            parentFragmentManager.setFragmentResult(
+                RESULT_KEY_B,
+                bundleOf(RESULT_BUNDLE to backgroundColor)
+            )
+
+            if (!requireContext().isLandscape()) {
+                parentFragmentManager.popBackStack()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Helper.kt b/app/src/main/java/otus/gpb/homework/fragments/Helper.kt
new file mode 100644
index 0000000..2ea6b19
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Helper.kt
@@ -0,0 +1,7 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.content.res.Configuration
+
+fun Context.isLandscape() =
+    resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE
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 6dc62ae..b6b515e 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -12,7 +12,10 @@ class MainActivity : AppCompatActivity() {
         setContentView(R.layout.activity_main)
 
         findViewById<Button>(R.id.btn_open_fragment_a).setOnClickListener {
-            supportFragmentManager.popBackStackImmediate("fragmentA", FragmentManager.POP_BACK_STACK_INCLUSIVE)
+            supportFragmentManager.popBackStackImmediate(
+                "fragmentA",
+                FragmentManager.POP_BACK_STACK_INCLUSIVE
+            )
 
             supportFragmentManager.beginTransaction()
                 .replace(R.id.fragment_view_container, FragmentA())
@@ -21,7 +24,10 @@ class MainActivity : AppCompatActivity() {
         }
 
         findViewById<Button>(R.id.btn_open_fragment_b).setOnClickListener {
-            supportFragmentManager.popBackStackImmediate("fragmentB", FragmentManager.POP_BACK_STACK_INCLUSIVE)
+            supportFragmentManager.popBackStackImmediate(
+                "fragmentB",
+                FragmentManager.POP_BACK_STACK_INCLUSIVE
+            )
 
             supportFragmentManager.beginTransaction()
                 .replace(R.id.fragment_view_container, FragmentB())
diff --git a/app/src/main/res/layout-land/fragment_b.xml b/app/src/main/res/layout-land/fragment_b.xml
index 41b5dbf..f491fe8 100644
--- a/app/src/main/res/layout-land/fragment_b.xml
+++ b/app/src/main/res/layout-land/fragment_b.xml
@@ -1,21 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:orientation="horizontal"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:orientation="horizontal">
+
 
     <androidx.fragment.app.FragmentContainerView
-        android:id="@+id/fragment_view_container_a"
+        android:id="@+id/fragment_view_container_ba"
         android:layout_width="0dp"
         android:layout_height="match_parent"
-        android:layout_weight="1"
-        />
+        android:layout_weight="1" />
 
     <androidx.fragment.app.FragmentContainerView
-        android:id="@+id/fragment_view_container_b"
+        android:id="@+id/fragment_view_container_bb"
         android:layout_width="0dp"
         android:layout_height="match_parent"
-        android:layout_weight="1"
-        />
+        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..fe39a87
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_ba.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/txt_fragment_ba_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Fragment BA"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="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 80c5401..ad93e45 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -11,9 +11,9 @@
         android:id="@+id/fragment_view_container"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toTopOf="@id/btn_open_fragment_a"
-        app:layout_constraintStart_toStartOf="parent" />
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
 
     <androidx.constraintlayout.widget.Guideline
         android:id="@+id/guideline"
diff --git a/app/src/main/res/layout/fragment_a.xml b/app/src/main/res/layout/fragment_a.xml
index 78898f0..afa29cf 100644
--- a/app/src/main/res/layout/fragment_a.xml
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -12,27 +12,26 @@
         android:layout_height="wrap_content"
         android:text="FragmentA"
         android:textAlignment="center"
-        app:layout_constraintTop_toTopOf="parent"
-        android:textSize="26sp" />
+        android:textSize="26sp"
+        app:layout_constraintTop_toTopOf="parent" />
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_open_fragment_aa"
-        android:layout_width="0dp"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        app:layout_constraintTop_toBottomOf="@id/txt_fragment_a_title"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
         android:layout_marginHorizontal="10dp"
-        android:text="Open fragment AA" />
+        android:text="Open fragment AA"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_a_title" />
 
     <androidx.fragment.app.FragmentContainerView
         android:id="@+id/fragment_view_container_a"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btn_open_fragment_aa"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        />
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/btn_open_fragment_aa" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
index 9f95b04..bcfdb22 100644
--- a/app/src/main/res/layout/fragment_aa.xml
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -8,22 +8,21 @@
         android:id="@+id/txt_fragment_aa_title"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:textSize="26sp"
         android:text="Fragment AA"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintBottom_toBottomOf="parent"
-        />
+        app:layout_constraintTop_toTopOf="parent" />
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_open_fragment_ab"
-        android:layout_width="0dp"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        app:layout_constraintTop_toBottomOf="@id/txt_fragment_aa_title"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
         android:layout_marginHorizontal="10dp"
-        android:text="Open fragment AB" />
+        android:text="Open fragment AB"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_aa_title" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
index c3f7fb0..88a5744 100644
--- a/app/src/main/res/layout/fragment_ab.xml
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
+    android:layout_height="match_parent">
 
     <TextView
         android:id="@+id/txt_fragment_a_title"
@@ -10,8 +10,8 @@
         android:layout_height="wrap_content"
         android:text="FragmentAB"
         android:textAlignment="center"
-        app:layout_constraintTop_toTopOf="parent"
+        android:textSize="26sp"
         app:layout_constraintBottom_toBottomOf="parent"
-        android:textSize="26sp" />
+        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 0abd527..72c1073 100644
--- a/app/src/main/res/layout/fragment_b.xml
+++ b/app/src/main/res/layout/fragment_b.xml
@@ -1,17 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
+    android:layout_height="match_parent">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="FragmentB"
-        android:textSize="26sp"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        />
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_view_container_ba"
+        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_ba.xml b/app/src/main/res/layout/fragment_ba.xml
index f0bce6b..39b345e 100644
--- a/app/src/main/res/layout/fragment_ba.xml
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -1,29 +1,28 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
+    android:layout_height="match_parent">
 
     <TextView
         android:id="@+id/txt_fragment_ba_title"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:textSize="26sp"
         android:text="Fragment BA"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintBottom_toBottomOf="parent"
-        />
+        app:layout_constraintTop_toTopOf="parent" />
 
     <com.google.android.material.button.MaterialButton
         android:id="@+id/btn_open_fragment_bb"
-        android:layout_width="0dp"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        app:layout_constraintTop_toBottomOf="@id/txt_fragment_ba_title"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
         android:layout_marginHorizontal="10dp"
-        android:text="Open fragment BB" />
+        android:text="Open fragment BB"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_ba_title" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_bb.xml b/app/src/main/res/layout/fragment_bb.xml
new file mode 100644
index 0000000..8c0c650
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/txt_fragment_bb_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Fragment BB"
+        android:textSize="26sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_send_color_to_ba"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginHorizontal="10dp"
+        android:text="Send Color"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/txt_fragment_bb_title" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values-land/bools.xml b/app/src/main/res/values-land/bools.xml
new file mode 100644
index 0000000..fc1d851
--- /dev/null
+++ b/app/src/main/res/values-land/bools.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <bool name="isLandscape">true</bool>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/bools.xml b/app/src/main/res/values/bools.xml
new file mode 100644
index 0000000..214d589
--- /dev/null
+++ b/app/src/main/res/values/bools.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <bool name="isLandscape">false</bool>
+</resources>
\ No newline at end of file

From fdf69f14cca9ee3dc9eba9d4e39bbf21b1c6078a Mon Sep 17 00:00:00 2001
From: Anv0l <andrei.voloshin@live.com>
Date: Sat, 26 Apr 2025 20:29:57 +0300
Subject: [PATCH 5/5] =?UTF-8?q?=D0=A1=D0=B4=D0=B5=D0=BB=D0=B0=D0=BB=20?=
 =?UTF-8?q?=D0=B7=D0=B0=D0=B4=D0=B0=D0=BD=D0=B8=D0=B5=20=E2=84=962=20fixed?=
 =?UTF-8?q?=20color=20for=20screen=20rotation?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../gpb/homework/fragments/ColorViewModel.kt  | 14 +++++++
 .../java/otus/gpb/homework/fragments/Const.kt |  2 +-
 .../otus/gpb/homework/fragments/FragmentB.kt  | 38 +++++++++++++++----
 .../otus/gpb/homework/fragments/FragmentBA.kt | 11 ++++--
 .../otus/gpb/homework/fragments/FragmentBB.kt |  9 ++---
 5 files changed, 56 insertions(+), 18 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ColorViewModel.kt

diff --git a/app/src/main/java/otus/gpb/homework/fragments/ColorViewModel.kt b/app/src/main/java/otus/gpb/homework/fragments/ColorViewModel.kt
new file mode 100644
index 0000000..100779e
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ColorViewModel.kt
@@ -0,0 +1,14 @@
+package otus.gpb.homework.fragments
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class ColorViewModel : ViewModel() {
+    private val _currentColor = MutableLiveData<Int>()
+    val currentColor: LiveData<Int> get() = _currentColor
+
+    fun setColor(color: Int) {
+        _currentColor.value = color
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Const.kt b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
index 44fd781..634ef16 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/Const.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/Const.kt
@@ -2,5 +2,5 @@ package otus.gpb.homework.fragments
 
 const val RESULT_KEY_A = "key_color_a"
 const val RESULT_KEY_A_A = "key_color_a_a"
-const val RESULT_KEY_B = "key_color_b"
+
 const val RESULT_BUNDLE = "bundle"
\ 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
index ec97763..a42b1df 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
@@ -5,9 +5,12 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
 
 
 class FragmentB : Fragment() {
+    private val viewModel: ColorViewModel by viewModels()
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
@@ -21,17 +24,36 @@ class FragmentB : Fragment() {
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        viewModel.currentColor.observe(viewLifecycleOwner) { color ->
+            updateFragments(color)
+        }
         if (resources.getBoolean(R.bool.isLandscape)) {
-            childFragmentManager.beginTransaction()
-                .replace(R.id.fragment_view_container_ba, FragmentBA())
-                .replace(R.id.fragment_view_container_bb, FragmentBB())
-                .commit()
+            showLandscape()
         } else {
-            childFragmentManager.beginTransaction()
-                .addToBackStack(null)
-                .replace(R.id.fragment_view_container_ba, FragmentBA())
-                .commit()
+            showPortrait()
         }
         super.onViewCreated(view, savedInstanceState)
     }
+
+    private fun showLandscape() {
+        childFragmentManager.beginTransaction()
+            .replace(R.id.fragment_view_container_ba, FragmentBA())
+            .replace(R.id.fragment_view_container_bb, FragmentBB())
+            .commit()
+    }
+
+    private fun showPortrait() {
+        childFragmentManager.beginTransaction()
+            .addToBackStack(null)
+            .replace(R.id.fragment_view_container_ba, FragmentBA())
+            .commit()
+    }
+
+    private fun updateFragments(color: Int) {
+        val fragmentBA = childFragmentManager.findFragmentById(R.id.fragment_view_container_ba)
+        if (fragmentBA is FragmentBA) {
+            fragmentBA.updateColor(color)
+        }
+    }
+
 }
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
index 075e8d3..be1dff6 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -6,9 +6,10 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
-import androidx.fragment.app.setFragmentResultListener
+import androidx.fragment.app.activityViewModels
 
 class FragmentBA : Fragment() {
+    private val parentViewModel: ColorViewModel by activityViewModels()
 
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -21,8 +22,8 @@ class FragmentBA : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        setFragmentResultListener(RESULT_KEY_B) { _, bundle ->
-            view.setBackgroundColor(bundle.getInt(RESULT_BUNDLE))
+        parentViewModel.currentColor.observe(viewLifecycleOwner) { color ->
+            view.setBackgroundColor(color)
         }
 
         if (!requireContext().isLandscape()) {
@@ -34,4 +35,8 @@ class FragmentBA : Fragment() {
             }
         }
     }
+
+    fun updateColor(color: Int) {
+        view?.setBackgroundColor(color)
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
index 13d59c2..7ba82ea 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -5,10 +5,11 @@ 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 androidx.fragment.app.activityViewModels
 
 class FragmentBB : Fragment() {
+    private val parentViewModel: ColorViewModel by activityViewModels()
 
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -23,11 +24,7 @@ class FragmentBB : Fragment() {
 
         view.findViewById<Button>(R.id.btn_send_color_to_ba).setOnClickListener {
             val backgroundColor = ColorGenerator.generateColor()
-
-            parentFragmentManager.setFragmentResult(
-                RESULT_KEY_B,
-                bundleOf(RESULT_BUNDLE to backgroundColor)
-            )
+            parentViewModel.setColor(backgroundColor)
 
             if (!requireContext().isLandscape()) {
                 parentFragmentManager.popBackStack()