homework is done

app/build.gradle

@@ -8,7 +8,7 @@ kotlin {
 }
 
 android {
-    compileSdk 34
+    compileSdk 35
     namespace "otus.gpb.homework.fragments"
 
     defaultConfig {
@@ -34,6 +34,9 @@ android {
     kotlinOptions {
         jvmTarget = '17'
     }
+    viewBinding {
+        enabled = true
+    }
 }
 
 dependencies {
@@ -42,6 +45,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.5.1'
     implementation 'com.google.android.material:material:1.6.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.activity:activity:1.10.1'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

app/src/main/AndroidManifest.xml

@@ -12,6 +12,12 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Fragments"
         tools:targetApi="31">
+        <activity
+            android:name=".ActivityOne"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityTwo"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">

app/src/main/java/otus/gpb/homework/fragments/ActivityOne.kt

@@ -0,0 +1,23 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class ActivityOne : AppCompatActivity() {
+
+    private lateinit var fragmentA: FragmentA
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_one)
+
+        fragmentA = FragmentA()
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragmentAContainer, fragmentA)
+            .commit()
+    }
+}

app/src/main/java/otus/gpb/homework/fragments/ActivityTwo.kt

@@ -0,0 +1,23 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class ActivityTwo : AppCompatActivity() {
+
+    private lateinit var fragmentB: FragmentB
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_two)
+
+        fragmentB = FragmentB()
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragmentBContainer, fragmentB)
+            .commit()
+    }
+}

app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt

@@ -0,0 +1,57 @@
+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 androidx.activity.OnBackPressedCallback
+import otus.gpb.homework.fragments.databinding.FragmentABinding
+
+class FragmentA : Fragment() {
+
+    private lateinit var fragmentAA: FragmentAA
+    private lateinit var binding: FragmentABinding
+
+    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 {
+        // Inflate the layout for this fragment
+        binding = FragmentABinding.inflate(layoutInflater)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        binding.transitionToFragmentAA.setOnClickListener {
+            val generatedColor = ColorGenerator.generateColor()
+            fragmentAA = FragmentAA.newInstance(generatedColor)
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_a_container, fragmentAA)
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+
+}

app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt

@@ -0,0 +1,55 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.util.Log
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+
+class FragmentAA : Fragment() {
+
+    private var randomColor: Int = 0
+    private lateinit var fragmentAB: FragmentAB
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            randomColor = it.getInt(ARG_RAND_COLOR)
+        }
+        Log.i("myColor", randomColor.toString())
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_a_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(randomColor)
+        fragmentAB = FragmentAB.newInstance(ColorGenerator.generateColor())
+        view.findViewById<Button>(R.id.transitionToFragmentAB).setOnClickListener {
+            parentFragmentManager
+                .beginTransaction()
+                .replace(R.id.fragment_a_container, fragmentAB)
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+
+    companion object {
+        private const val ARG_RAND_COLOR = "random_color"
+        fun newInstance(value: Int): FragmentAA {
+            val fragment = FragmentAA()
+            val args = Bundle()
+            args.putInt(ARG_RAND_COLOR, value)
+            fragment.arguments = args
+            return fragment
+        }
+    }
+}

app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt

@@ -0,0 +1,45 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.util.Log
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import otus.gpb.homework.fragments.FragmentAA.Companion
+
+class FragmentAB : Fragment() {
+
+    private var randomColor: Int = 0
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            randomColor = it.getInt(ARG_RAND_COLOR)
+        }
+        Log.i("myColor", randomColor.toString())
+    }
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_a_b, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(randomColor)
+    }
+
+    companion object {
+        private const val ARG_RAND_COLOR = "random_color"
+        fun newInstance(value: Int): FragmentAB {
+            val fragment = FragmentAB()
+            val args = Bundle()
+            args.putInt(ARG_RAND_COLOR, value)
+            fragment.arguments = args
+            return fragment
+        }
+    }
+}

app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt

@@ -0,0 +1,89 @@
+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 otus.gpb.homework.fragments.databinding.FragmentBBinding
+
+class FragmentB : Fragment() {
+
+    private var isLandScape = false
+    private var fragmentBAColor: Int? = null
+
+    private var _binding: FragmentBBinding? = null
+    private val binding get() = _binding!!
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        isLandScape = resources.getBoolean(R.bool.isLandscape)
+        fragmentBAColor = savedInstanceState?.getInt("fragmentBA_color")
+        if (fragmentBAColor == null) {
+            fragmentBAColor = ColorGenerator.generateColor()
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        fragmentBAColor?.let {
+            outState.putInt("fragmentBA_color", it)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentBBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(fragmentBAColor!!)
+
+        childFragmentManager.setFragmentResultListener("openFragmentBB", this) { _, _ ->
+            childFragmentManager
+                .beginTransaction()
+                .replace(R.id.fragmentBContainer, FragmentBB.newInstance(ColorGenerator.generateColor()))
+                .addToBackStack(null)
+                .commit()
+        }
+        childFragmentManager.setFragmentResultListener("openFragmentBA", this) { _, bundle ->
+            childFragmentManager
+                .beginTransaction()
+                .replace(R.id.fragmentBContainer, FragmentBA.newInstance(bundle.getInt("BACKGROUND_COLOR")))
+                .addToBackStack(null)
+                .commit()
+        }
+
+        childFragmentManager.setFragmentResultListener("openLandFragmentBA", this) { _, bundle ->
+            childFragmentManager
+                .beginTransaction()
+                .replace(R.id.container_ba, FragmentBA.newInstance(bundle.getInt("BACKGROUND_COLOR")))
+                .addToBackStack(null)
+                .commit()
+        }
+
+        if (savedInstanceState == null) {
+            if (!isLandScape) {
+                val childFragment = FragmentBA.newInstance(fragmentBAColor!!)
+                childFragmentManager
+                    .beginTransaction()
+                    .replace(R.id.fragmentBContainer, childFragment)
+                    .commit()
+
+            } else {
+                childFragmentManager
+                    .beginTransaction()
+                    .replace(R.id.container_ba, FragmentBA.newInstance(fragmentBAColor!!))
+                    .replace(R.id.container_bb, FragmentBB.newInstance(ColorGenerator.generateColor()))
+                    .commit()
+            }
+        }
+    }
+
+}