From 01aab3bc5d9708f6e80c5521b7449a404db9595d Mon Sep 17 00:00:00 2001
From: Sergei Korotaev <zergwsmt@gmail.com>
Date: Fri, 2 May 2025 00:47:24 +0300
Subject: [PATCH] Initial commit.

---
 app/build.gradle                              | 23 +++++----
 app/src/main/AndroidManifest.xml              |  8 +++
 .../otus/gpb/homework/fragments/ActivityA.kt  | 20 ++++++++
 .../otus/gpb/homework/fragments/ActivityB.kt  | 42 ++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentA.kt  | 50 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentAA.kt | 50 +++++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentAB.kt | 43 ++++++++++++++++
 .../otus/gpb/homework/fragments/FragmentBA.kt | 38 ++++++++++++++
 .../otus/gpb/homework/fragments/FragmentBB.kt | 31 ++++++++++++
 .../gpb/homework/fragments/FragmentResult.kt  | 29 +++++++++++
 .../gpb/homework/fragments/MainActivity.kt    | 10 ++++
 app/src/main/res/layout-land/activity_b.xml   | 19 +++++++
 app/src/main/res/layout/activity_a.xml        | 11 ++++
 app/src/main/res/layout/activity_b.xml        | 11 ++++
 app/src/main/res/layout/activity_main.xml     | 18 +++++--
 app/src/main/res/layout/fragment_a.xml        | 39 +++++++++++++++
 app/src/main/res/layout/fragment_aa.xml       | 29 +++++++++++
 app/src/main/res/layout/fragment_ab.xml       | 15 ++++++
 app/src/main/res/layout/fragment_ba.xml       | 31 ++++++++++++
 app/src/main/res/layout/fragment_bb.xml       | 31 ++++++++++++
 app/src/main/res/values/colors.xml            |  1 +
 app/src/main/res/values/strings.xml           |  6 +++
 build.gradle                                  |  4 +-
 gradle/wrapper/gradle-wrapper.properties      |  2 +-
 24 files changed, 544 insertions(+), 17 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/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/FragmentResult.kt
 create mode 100644 app/src/main/res/layout-land/activity_b.xml
 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_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..44c4f89 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,12 +3,8 @@ plugins {
     id 'org.jetbrains.kotlin.android'
 }
 
-kotlin {
-    jvmToolchain(17)
-}
-
 android {
-    compileSdk 34
+    compileSdk 35
     namespace "otus.gpb.homework.fragments"
 
     defaultConfig {
@@ -34,15 +30,20 @@ android {
     kotlinOptions {
         jvmTarget = '17'
     }
+
+    buildFeatures {
+        viewBinding = true
+    }
 }
 
 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/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9604b34..c8e63bf 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -21,6 +21,14 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".ActivityA"
+            android:label="Activity A"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityB"
+            android:label="Activity B"
+            android:exported="false" />
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
new file mode 100644
index 0000000..2525e79
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
@@ -0,0 +1,20 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityA : AppCompatActivity() {
+
+    private lateinit var fragmentA: FragmentA
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_a)
+        if (savedInstanceState == null) {
+            fragmentA = FragmentA()
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.activity_a_container, fragmentA)
+                .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..b09523a
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
@@ -0,0 +1,42 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityB : AppCompatActivity() {
+    private val saveColor = "saveColor"
+    private var baColor: Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_b)
+
+        if (savedInstanceState != null) {
+            baColor = savedInstanceState.getInt(saveColor)
+        }
+
+        val fba = FragmentBA()
+
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.activity_ba_container, fba)
+                .replace(R.id.activity_bb_container, FragmentBB())
+                .commit()
+        } else {
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.activity_b_container, fba)
+                .commit()
+        }
+
+        fba.sendColor(baColor)
+        supportFragmentManager.observeColor(this) {color ->
+            baColor = color
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putInt(saveColor, baColor)
+    }
+}
\ 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..cbb1da6
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,50 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import otus.gpb.homework.fragments.ColorGenerator.generateColor
+
+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.open_fragment_aa).setOnClickListener {
+
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_a_container, FragmentAA.newInstance(generateColor()))
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
new file mode 100644
index 0000000..f503a31
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,50 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import otus.gpb.homework.fragments.ColorGenerator.generateColor
+
+private const val SET_COLOR = "setColor"
+
+open class FragmentAA : Fragment() {
+    private var color: Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(SET_COLOR)
+        }
+    }
+
+    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?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(color)
+        view.findViewById<Button>(R.id.open_fragment_ab).setOnClickListener {
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.fragment_a_container, FragmentAB.newInstance(generateColor()))
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(SET_COLOR, color)
+                }
+            }
+    }
+}
\ 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..ddf334a
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,43 @@
+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
+
+private const val SET_COLOR = "setColor"
+
+class FragmentAB : Fragment() {
+    private var color: Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(SET_COLOR)
+        }
+    }
+
+    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)
+        view.setBackgroundColor(color)
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAB().apply {
+                arguments = Bundle().apply {
+                    putInt(SET_COLOR, color)
+                }
+            }
+    }
+}
\ 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..a488b58
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,38 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.core.view.isVisible
+import androidx.fragment.app.Fragment
+
+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)
+
+        applyColor {
+            c->view.setBackgroundColor(c)
+        }
+
+        val openBB = view.findViewById<Button>(R.id.open_fragment_bb)
+        openBB?.isVisible =
+            resources.configuration.orientation != Configuration.ORIENTATION_LANDSCAPE
+
+        openBB.setOnClickListener{
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.activity_b_container, FragmentBB())
+                .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..d46c5ce
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,31 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.ColorGenerator.generateColor
+
+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.send_color).setOnClickListener {
+            if (resources.configuration.orientation != Configuration.ORIENTATION_LANDSCAPE) {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.activity_b_container, FragmentBA())
+                    .commit()
+            }
+            sendColor(generateColor())
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentResult.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentResult.kt
new file mode 100644
index 0000000..b4fea64
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentResult.kt
@@ -0,0 +1,29 @@
+package otus.gpb.homework.fragments
+
+import androidx.core.os.bundleOf
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
+import androidx.fragment.app.setFragmentResult
+import androidx.fragment.app.setFragmentResultListener
+import androidx.lifecycle.LifecycleOwner
+
+private const val F_RESULT_KEY = "fResult"
+private const val FM_RESULT_KEY = "fmResult"
+private const val COLOR_KEY = "color"
+
+fun Fragment.sendColor(color: Int) {
+    setFragmentResult(F_RESULT_KEY, bundleOf(COLOR_KEY to color))
+    setFragmentResult(FM_RESULT_KEY, bundleOf(COLOR_KEY to color))
+}
+
+fun Fragment.applyColor(callback: (Int)->Unit) {
+    setFragmentResultListener(F_RESULT_KEY) { _, bundle ->
+        callback(bundle.getInt(COLOR_KEY, 0))
+    }
+}
+
+fun FragmentManager.observeColor(lifecycleOwner: LifecycleOwner, callback: (Int)->Unit) {
+    setFragmentResultListener(FM_RESULT_KEY, lifecycleOwner) {_, bundle ->
+        callback(bundle.getInt(COLOR_KEY, 0))
+    }
+}
\ 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..ffcac96 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -1,6 +1,8 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
+import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
 
 class MainActivity : AppCompatActivity() {
@@ -8,5 +10,13 @@ class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        findViewById<Button>(R.id.open_activity_a).setOnClickListener {
+            startActivity(Intent(this, ActivityA::class.java))
+        }
+
+        findViewById<Button>(R.id.open_activity_b).setOnClickListener {
+            startActivity(Intent(this, ActivityB::class.java))
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/activity_b.xml b/app/src/main/res/layout-land/activity_b.xml
new file mode 100644
index 0000000..12ee5a8
--- /dev/null
+++ b/app/src/main/res/layout-land/activity_b.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="horizontal">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/activity_ba_container"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/activity_bb_container"
+        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/activity_a.xml b/app/src/main/res/layout/activity_a.xml
new file mode 100644
index 0000000..f8ad680
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.xml
@@ -0,0 +1,11 @@
+<?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.fragment.app.FragmentContainerView
+        android:id="@+id/activity_a_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_b.xml b/app/src/main/res/layout/activity_b.xml
new file mode 100644
index 0000000..d295ea5
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/activity_b_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 17eab17..cc473d9 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -6,13 +6,25 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
+    <Button
+        android:id="@+id/open_activity_a"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="@string/open_activity_a"
+        app:layout_constraintVertical_chainStyle="packed"
+        app:layout_constraintBottom_toTopOf="@id/open_activity_b"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <Button
+        android:id="@+id/open_activity_b"
+        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="@+id/open_activity_a"
+        app:layout_constraintStart_toStartOf="@+id/open_activity_a"
+        app:layout_constraintTop_toBottomOf="@+id/open_activity_a" />
+
 </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..1ccf4d1
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,39 @@
+<?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=".FragmentA">
+
+    <TextView
+        android:id="@+id/fragment_a_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Fragment A"
+        android:textAlignment="center"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_a_container"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_margin="10dp"
+        app:layout_constraintBottom_toTopOf="@id/open_fragment_aa"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/fragment_a_name" />
+
+    <Button
+        android:id="@+id/open_fragment_aa"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_fragment_aa"
+        android:layout_marginBottom="20dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/fragment_a_container" />
+
+</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..4c907d8
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentAA">
+
+    <TextView
+        android:id="@+id/fragment_aa_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Fragment AA"
+        android:textAlignment="center"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/open_fragment_ab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_fragment_ab"
+        android:layout_marginBottom="20dp"
+        app:layout_constraintStart_toStartOf="parent"
+        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_ab.xml b/app/src/main/res/layout/fragment_ab.xml
new file mode 100644
index 0000000..1221e0a
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentAB">
+
+    <TextView
+        android:id="@+id/fragment_ab_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Fragment AB"
+        android:textAlignment="center"/>
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ba.xml b/app/src/main/res/layout/fragment_ba.xml
new file mode 100644
index 0000000..0c86d5c
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/fragment_ba_layout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentBA">
+
+    <TextView
+        android:id="@+id/fragment_ba_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Fragment BA"
+        android:textAlignment="center"
+        app:layout_constraintBottom_toTopOf="@+id/open_fragment_bb"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/open_fragment_bb"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_fragment_bb"
+        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/fragment_bb.xml b/app/src/main/res/layout/fragment_bb.xml
new file mode 100644
index 0000000..fdaf246
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,31 @@
+<?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:background="@color/yellow"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentBB">
+
+    <TextView
+        android:id="@+id/fragment_bb_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Fragment BB"
+        android:textAlignment="center"
+        app:layout_constraintBottom_toTopOf="@id/send_color"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/send_color"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/send_color"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index f8c6127..f964d50 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -7,4 +7,5 @@
     <color name="teal_700">#FF018786</color>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="yellow">#FFFFFF00</color>
 </resources>
\ 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..1e1ff2a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,9 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <string name="open_activity_a">Open Activity A</string>
+    <string name="open_activity_b">Open Activity B</string>
+    <string name="open_fragment_aa">Open Fragment AA</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
diff --git a/build.gradle b/build.gradle
index bd20018..b743de8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '8.7.2' apply false
-    id 'com.android.library' version '8.7.2' apply false
+    id 'com.android.application' version '8.9.2' apply false
+    id 'com.android.library' version '8.9.2' apply false
     id 'org.jetbrains.kotlin.android' version '2.0.21' apply false
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1f1d072..955322e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 #Tue Nov 05 08:41:56 CET 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists