From 8c13216745caeb3f463e0ad4d8a7ad5fe0ecfbf7 Mon Sep 17 00:00:00 2001
From: v_kopychko <v_kopychko@inpas.ru>
Date: Fri, 6 Mar 2026 03:16:36 +0300
Subject: [PATCH 1/2] =?UTF-8?q?=D0=94=D0=BE=D0=BC=D0=B0=D1=88=D0=BD=D0=B5?=
 =?UTF-8?q?=D0=B5=20=D0=B7=D0=B0=D0=B4=D0=B0=D0=BD=D0=B8=D0=B5=20Fragments?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/build.gradle                              |  4 ++
 app/src/main/AndroidManifest.xml              |  7 ++-
 .../otus/gpb/homework/fragments/ActivityA.kt  | 29 ++++++++++
 .../otus/gpb/homework/fragments/ActivityB.kt  | 46 ++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentA.kt  | 52 ++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentAA.kt | 55 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentAB.kt | 25 +++++++++
 .../otus/gpb/homework/fragments/FragmentB.kt  |  6 ++
 .../otus/gpb/homework/fragments/FragmentBA.kt | 34 ++++++++++++
 .../otus/gpb/homework/fragments/FragmentBB.kt | 32 +++++++++++
 .../gpb/homework/fragments/MainActivity.kt    | 19 ++++++-
 app/src/main/res/layout/activity_a.xml        | 13 +++++
 app/src/main/res/layout/activity_b.xml        | 35 ++++++++++++
 app/src/main/res/layout/activity_main.xml     | 18 ++++--
 app/src/main/res/layout/fragment_a.xml        | 33 +++++++++++
 app/src/main/res/layout/fragment_aa.xml       | 23 ++++++++
 app/src/main/res/layout/fragment_ab.xml       | 15 +++++
 app/src/main/res/layout/fragment_b.xml        | 14 +++++
 app/src/main/res/layout/fragment_ba.xml       | 16 ++++++
 app/src/main/res/layout/fragment_bb.xml       | 16 ++++++
 app/src/main/res/values/strings.xml           | 18 ++++++
 21 files changed, 502 insertions(+), 8 deletions(-)
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/ActivityB.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/FragmentAB.kt
 create mode 100644 app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
 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/res/layout/activity_a.xml
 create mode 100644 app/src/main/res/layout/activity_b.xml
 create mode 100644 app/src/main/res/layout/fragment_a.xml
 create mode 100644 app/src/main/res/layout/fragment_aa.xml
 create mode 100644 app/src/main/res/layout/fragment_ab.xml
 create mode 100644 app/src/main/res/layout/fragment_b.xml
 create mode 100644 app/src/main/res/layout/fragment_ba.xml
 create mode 100644 app/src/main/res/layout/fragment_bb.xml

diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..5ed27e0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -34,6 +34,9 @@ android {
     kotlinOptions {
         jvmTarget = '17'
     }
+    buildFeatures {
+        viewBinding = true
+    }
 }
 
 dependencies {
@@ -45,4 +48,5 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    implementation 'androidx.activity:activity:1.9.3'
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9604b34..bee542a 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,12 +12,17 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Fragments"
         tools:targetApi="31">
+        <activity
+            android:name=".ActivityA"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityB"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
new file mode 100644
index 0000000..25f08fa
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
@@ -0,0 +1,29 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.window.OnBackInvokedDispatcher
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import otus.gpb.homework.fragments.databinding.ActivityABinding
+import otus.gpb.homework.fragments.databinding.ActivityMainBinding
+import otus.gpb.homework.fragments.fragments.FragmentA
+
+class ActivityA : AppCompatActivity() {
+    private lateinit var binding: ActivityABinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        binding = ActivityABinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        if (savedInstanceState == null) {
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragmentContainerA, FragmentA(), "FragmentA")
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
new file mode 100644
index 0000000..2e22493
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
@@ -0,0 +1,46 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.isVisible
+import otus.gpb.homework.fragments.databinding.ActivityBBinding
+import otus.gpb.homework.fragments.fragments.FragmentBA
+import otus.gpb.homework.fragments.fragments.FragmentBB
+
+class ActivityB : AppCompatActivity() {
+
+    private lateinit var binding: ActivityBBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        binding = ActivityBBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragmentContainerBA, FragmentBA())
+            .replace(R.id.fragmentContainerBB, FragmentBB())
+            .commit()
+
+        switchFragments()
+    }
+
+    private fun switchFragments() {
+
+        val currentOrientation = resources.configuration.orientation
+        if (currentOrientation == Configuration.ORIENTATION_PORTRAIT) {
+            with(binding) {
+                fragmentContainerBA.isVisible = true
+                fragmentContainerBB.isVisible = false
+            }
+
+        } else {
+            with(binding) {
+                fragmentContainerBA.isVisible = true
+                fragmentContainerBB.isVisible = true
+            }
+        }
+    }
+}
\ 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..b7296fe
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,52 @@
+package otus.gpb.homework.fragments.fragments
+
+import android.os.Bundle
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.ColorGenerator
+import otus.gpb.homework.fragments.R
+import otus.gpb.homework.fragments.databinding.ActivityMainBinding
+import otus.gpb.homework.fragments.databinding.FragmentABinding
+
+private const val KEY = "color"
+class FragmentA : Fragment( ) {
+
+    private lateinit var binding: FragmentABinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding = FragmentABinding.inflate(inflater, container, false)
+        binding.openFragmentAA.isEnabled = true
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+
+        val bundle = Bundle()
+        bundle.putInt(KEY, ColorGenerator.generateColor())
+        val fragmentAA = FragmentAA()
+        fragmentAA.arguments = bundle
+
+        binding.openFragmentAA.setOnClickListener {
+            childFragmentManager.beginTransaction()
+                .add(R.id.fragmentContainerAA, fragmentAA)
+                .addToBackStack("fragmentA")
+                .commit()
+            binding.openFragmentAA.isEnabled = false
+        }
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+               activity?.finish()
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, callback)
+    }
+}
\ 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..61ee84a
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,55 @@
+package otus.gpb.homework.fragments.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.ColorGenerator
+import otus.gpb.homework.fragments.R
+import otus.gpb.homework.fragments.databinding.FragmentAaBinding
+
+
+private const val KEY = "color"
+class FragmentAA : Fragment() {
+
+    private lateinit var binding: FragmentAaBinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding = FragmentAaBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val color = arguments?.getInt(KEY)
+        if (color != null) {
+            this.view?.setBackgroundColor(color)
+        }
+
+        val bundle = Bundle()
+        bundle.putInt(KEY, ColorGenerator.generateColor())
+        val fragmentAB = FragmentAB()
+        fragmentAB.arguments = bundle
+
+        binding.openFragmentAB.setOnClickListener {
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.fragmentContainerAB, fragmentAB)
+                .addToBackStack("fragmentAA")
+                .commit()
+        }
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                parentFragmentManager.popBackStack()
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, callback)
+    }
+}
\ 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..eddd8e2
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,25 @@
+package otus.gpb.homework.fragments.fragments
+
+import android.os.Bundle
+import android.view.View
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.R
+private const val KEY = "color"
+class FragmentAB : Fragment(R.layout.fragment_ab) {
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val color = arguments?.getInt(KEY)
+
+        if (color != null) {
+            this.view?.setBackgroundColor(color)
+        }
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                parentFragmentManager.popBackStack("fragmentAA", 1)
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, callback)
+    }
+}
\ 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..8808be3
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
@@ -0,0 +1,6 @@
+package otus.gpb.homework.fragments.fragments
+
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.R
+
+class FragmentB : Fragment(R.layout.fragment_b)
\ 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..22bced7
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,34 @@
+package otus.gpb.homework.fragments.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import androidx.core.view.isVisible
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.R
+
+private const val KEY = "color"
+private const val REQUEST_KEY = "colorBundle"
+class FragmentBA : Fragment(R.layout.fragment_ba) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        parentFragmentManager.setFragmentResultListener(REQUEST_KEY, this) { _, bundle ->
+            val color = bundle.getInt(KEY)
+            this.view?.setBackgroundColor(color)
+        }
+
+        with(view.findViewById<Button>(R.id.openFragmentBB)) {
+
+            setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.fragmentContainerBA, FragmentBB())
+                    .commit()
+            }
+            val currentOrientation = resources.configuration.orientation
+            isVisible = currentOrientation == Configuration.ORIENTATION_PORTRAIT
+        }
+    }
+}
\ 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..d0d5c8c
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,32 @@
+package otus.gpb.homework.fragments.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.ColorGenerator
+import otus.gpb.homework.fragments.R
+
+private const val KEY = "color"
+private const val REQUEST_KEY = "colorBundle"
+class FragmentBB : Fragment(R.layout.fragment_bb) {
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.sendColor).setOnClickListener {
+
+            val bundle = Bundle()
+            bundle.putInt(KEY, ColorGenerator.generateColor())
+
+            parentFragmentManager.setFragmentResult(REQUEST_KEY, bundle)
+
+            val currentOrientation = resources.configuration.orientation
+            if (currentOrientation == Configuration.ORIENTATION_PORTRAIT) {
+                parentFragmentManager.beginTransaction()
+                    .add(R.id.fragmentContainerBA, FragmentBA())
+                    .commit()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
index 5e89c44..8c67384 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 +1,27 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import otus.gpb.homework.fragments.databinding.ActivityMainBinding
 
 class MainActivity : AppCompatActivity() {
 
+    private lateinit var binding: ActivityMainBinding
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
+
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        binding.openActivityA.setOnClickListener {
+            startActivity(Intent(this, ActivityA::class.java))
+        }
+
+        binding.openActivityB.setOnClickListener {
+            startActivity(Intent(this, ActivityB::class.java))
+        }
     }
-}
\ No newline at end of file
+}
+
diff --git a/app/src/main/res/layout/activity_a.xml b/app/src/main/res/layout/activity_a.xml
new file mode 100644
index 0000000..9fc8b56
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.xml
@@ -0,0 +1,13 @@
+<?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"
+    tools:context=".ActivityA">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentContainerA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_b.xml b/app/src/main/res/layout/activity_b.xml
new file mode 100644
index 0000000..f6c3fea
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,35 @@
+<?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=".ActivityB">
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="match_parent"
+        android:orientation="horizontal"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.5">
+
+        <androidx.fragment.app.FragmentContainerView
+            android:id="@+id/fragmentContainerBA"
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1" />
+
+        <androidx.fragment.app.FragmentContainerView
+            android:id="@+id/fragmentContainerBB"
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1" />
+
+    </LinearLayout>
+
+
+</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..59de17f 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,15 +4,23 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:padding="20dp"
     tools:context=".MainActivity">
 
-    <TextView
+    <Button
+        android:id="@+id/openActivityA"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text="@string/open_activity_a"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <Button
+        android:id="@+id/openActivityB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_activity_b"
+        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_a.xml b/app/src/main/res/layout/fragment_a.xml
new file mode 100644
index 0000000..f8c4c56
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,33 @@
+<?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=".fragments.FragmentA">
+
+    <Button
+        android:id="@+id/openFragmentAA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/open_fragment_aa" />
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:textColor="@color/black"
+        android:layout_gravity="center"
+        android:text="TextView1" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentContainerAA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentContainerAB"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
new file mode 100644
index 0000000..885cb58
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/fragmentAA"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/black"
+    tools:context=".fragments.FragmentAA">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="@string/fragment_a_a" />
+
+    <Button
+        android:id="@+id/openFragmentAB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_margin="20dp"
+        android:text="@string/open_fragment_ab" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
new file mode 100644
index 0000000..4534341
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".fragments.FragmentAB">
+
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:textColor="@color/white"
+        android:text="@string/fragment_a_b" />
+
+</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..ab23bbf
--- /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"
+    android:background="@color/black"
+    tools:context=".fragments.FragmentB">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:text="@string/fragment_b" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ba.xml b/app/src/main/res/layout/fragment_ba.xml
new file mode 100644
index 0000000..75cf94c
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,16 @@
+<?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=".fragments.FragmentBA">
+
+    <Button
+        android:id="@+id/openFragmentBB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="20dp"
+        android:layout_gravity="center"
+        android:text="@string/open_fragment_bb" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_bb.xml b/app/src/main/res/layout/fragment_bb.xml
new file mode 100644
index 0000000..d2a4969
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,16 @@
+<?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=".fragments.FragmentBB">
+
+    <Button
+        android:id="@+id/sendColor"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="20dp"
+        android:layout_gravity="center"
+        android:text="@string/send_color" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 34277aa..b009214 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,21 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <!-- TODO: Remove or change this placeholder text -->
+    <string name="hello_blank_fragment">Hello blank fragment</string>
+    <string name="fragment_a_a">Fragment A A</string>
+    <string name="fragment_a_b">Fragment A B</string>
+    <string name="fragment_b_b">Fragment B B</string>
+    <string name="fragment_b_a">Fragment B A</string>
+    <string name="main_activity">Main Activity!</string>
+    <string name="open_activity_a">Open Activity A</string>
+    <string name="open_activity_b">Open Activity B</string>
+    <string name="activity_a">Activity A</string>
+    <string name="activity_b">Activity B</string>
+    <string name="fragment_a">Fragment A</string>
+    <string name="fragment_b">Fragment B</string>
+    <string name="open_fragment_aa">Open fragment AA</string>
+    <string name="open_fragment_a">Open fragment A</string>
+    <string name="open_fragment_ab">Open fragment AB</string>
+    <string name="open_fragment_bb">Open Fragment BB</string>
+    <string name="send_color">send Color</string>
 </resources>
\ No newline at end of file

From 59bd08d399bd46e61bb6132826a12d9457c65963 Mon Sep 17 00:00:00 2001
From: v_kopychko <v_kopychko@inpas.ru>
Date: Fri, 6 Mar 2026 19:14:55 +0300
Subject: [PATCH 2/2] =?UTF-8?q?=D0=94=D0=BE=D0=BF=D0=BE=D0=BB=D0=BD=D0=B5?=
 =?UTF-8?q?=D0=BD=D0=B8=D0=B5?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../otus/gpb/homework/fragments/FragmentBA.kt | 19 +++++++++--
 .../otus/gpb/homework/fragments/FragmentBB.kt | 17 ++++++++--
 app/src/main/res/layout/fragment_a.xml        | 17 +++++++---
 app/src/main/res/layout/fragment_aa.xml       | 32 ++++++++++++-------
 app/src/main/res/layout/fragment_ab.xml       | 20 +++++++++---
 app/src/main/res/values/strings.xml           |  8 ++---
 6 files changed, 85 insertions(+), 28 deletions(-)

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 22bced7..1497536 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -2,15 +2,30 @@ package otus.gpb.homework.fragments.fragments
 
 import android.content.res.Configuration
 import android.os.Bundle
+import android.view.LayoutInflater
 import android.view.View
+import android.view.ViewGroup
 import android.widget.Button
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import otus.gpb.homework.fragments.R
+import otus.gpb.homework.fragments.databinding.FragmentABinding
+import otus.gpb.homework.fragments.databinding.FragmentBaBinding
 
 private const val KEY = "color"
 private const val REQUEST_KEY = "colorBundle"
-class FragmentBA : Fragment(R.layout.fragment_ba) {
+class FragmentBA : Fragment() {
+
+    private lateinit var binding: FragmentBaBinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding = FragmentBaBinding.inflate(inflater, container, false)
+        return binding.root
+    }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
@@ -20,7 +35,7 @@ class FragmentBA : Fragment(R.layout.fragment_ba) {
             this.view?.setBackgroundColor(color)
         }
 
-        with(view.findViewById<Button>(R.id.openFragmentBB)) {
+        with(binding.openFragmentBB) {
 
             setOnClickListener {
                 parentFragmentManager.beginTransaction()
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 d0d5c8c..dfee6d3 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -2,20 +2,33 @@ package otus.gpb.homework.fragments.fragments
 
 import android.content.res.Configuration
 import android.os.Bundle
+import android.view.LayoutInflater
 import android.view.View
+import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
 import otus.gpb.homework.fragments.ColorGenerator
 import otus.gpb.homework.fragments.R
+import otus.gpb.homework.fragments.databinding.FragmentBbBinding
 
 private const val KEY = "color"
 private const val REQUEST_KEY = "colorBundle"
 class FragmentBB : Fragment(R.layout.fragment_bb) {
+
+    private lateinit var binding: FragmentBbBinding
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        binding = FragmentBbBinding.inflate(inflater, container, false)
+        return binding.root
+    }
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        view.findViewById<Button>(R.id.sendColor).setOnClickListener {
-
+        binding.sendColor.setOnClickListener {
             val bundle = Bundle()
             bundle.putInt(KEY, ColorGenerator.generateColor())
 
diff --git a/app/src/main/res/layout/fragment_a.xml b/app/src/main/res/layout/fragment_a.xml
index f8c4c56..fe31524 100644
--- a/app/src/main/res/layout/fragment_a.xml
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -5,6 +5,13 @@
     android:layout_height="match_parent"
     tools:context=".fragments.FragmentA">
 
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:gravity="center"
+         >
+
     <Button
         android:id="@+id/openFragmentAA"
         android:layout_width="wrap_content"
@@ -14,11 +21,13 @@
 
     <TextView
         android:id="@+id/textView"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:textColor="@color/black"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_a"
+        android:textSize="30sp"
         android:layout_gravity="center"
-        android:text="TextView1" />
+        android:textColor="@color/black" />
+    </LinearLayout>
 
     <androidx.fragment.app.FragmentContainerView
         android:id="@+id/fragmentContainerAA"
diff --git a/app/src/main/res/layout/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
index 885cb58..09472eb 100644
--- a/app/src/main/res/layout/fragment_aa.xml
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -7,17 +7,27 @@
     android:background="@color/black"
     tools:context=".fragments.FragmentAA">
 
-    <TextView
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:text="@string/fragment_a_a" />
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:gravity="center"
+        >
 
-    <Button
-        android:id="@+id/openFragmentAB"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="center"
-        android:layout_margin="20dp"
-        android:text="@string/open_fragment_ab" />
+        <Button
+            android:id="@+id/openFragmentAB"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:text="@string/open_fragment_ab" />
 
+        <TextView
+            android:id="@+id/textView"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/fragment_a_a"
+            android:textSize="30sp"
+            android:layout_gravity="center"
+            android:textColor="@color/black" />
+    </LinearLayout>
 </FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
index 4534341..49e17f1 100644
--- a/app/src/main/res/layout/fragment_ab.xml
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -5,11 +5,21 @@
     android:layout_height="match_parent"
     tools:context=".fragments.FragmentAB">
 
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:gravity="center"
+        >
 
-    <TextView
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:textColor="@color/white"
-        android:text="@string/fragment_a_b" />
+        <TextView
+            android:id="@+id/textView"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/fragment_a_b"
+            android:textSize="30sp"
+            android:layout_gravity="center"
+            android:textColor="@color/black" />
+    </LinearLayout>
 
 </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 b009214..05a8be4 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -2,10 +2,10 @@
     <string name="app_name">Fragments</string>
     <!-- TODO: Remove or change this placeholder text -->
     <string name="hello_blank_fragment">Hello blank fragment</string>
-    <string name="fragment_a_a">Fragment A A</string>
-    <string name="fragment_a_b">Fragment A B</string>
-    <string name="fragment_b_b">Fragment B B</string>
-    <string name="fragment_b_a">Fragment B A</string>
+    <string name="fragment_a_a">Fragment AA</string>
+    <string name="fragment_a_b">Fragment AB</string>
+    <string name="fragment_b_b">Fragment BB</string>
+    <string name="fragment_b_a">Fragment BA</string>
     <string name="main_activity">Main Activity!</string>
     <string name="open_activity_a">Open Activity A</string>
     <string name="open_activity_b">Open Activity B</string>