Домашнее задание фрагменты

app/build.gradle

@@ -34,11 +34,15 @@ android {
     kotlinOptions {
         jvmTarget = '17'
     }
+    buildFeatures {
+        viewBinding = true
+    }
 }
 
 dependencies {
 
     implementation 'androidx.core:core-ktx:1.7.0'
+    implementation("androidx.fragment:fragment-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'

app/src/main/AndroidManifest.xml

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

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

@@ -0,0 +1,27 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import otus.gpb.homework.fragments.databinding.ActivityABinding
+
+class ActivityA : AppCompatActivity() {
+
+    private lateinit var binding: ActivityABinding
+
+    private lateinit var fragmentA: FragmentA
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityABinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        fragmentA = if (savedInstanceState == null) {
+            FragmentA.newInstance()
+        } else {
+            supportFragmentManager.findFragmentByTag("fragmentA") as FragmentA
+        }
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragment_activity_a, fragmentA, "fragmentA")
+            .commit()
+
+    }
+}

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

@@ -0,0 +1,50 @@
+package otus.gpb.homework.fragments
+
+import android.R.attr.orientation
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import otus.gpb.homework.fragments.databinding.ActivityBBinding
+
+class ActivityB : AppCompatActivity() {
+
+    private lateinit var binding: ActivityBBinding
+
+    private lateinit var fragmentBA: FragmentBA
+    private lateinit var fragmentBB: FragmentBB
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityBBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            fragmentBA = savedInstanceState
+                ?.let { supportFragmentManager.findFragmentByTag(FragmentBA::class.simpleName) as? FragmentBA }
+                ?: FragmentBA()
+
+            fragmentBB = savedInstanceState
+                ?.let { supportFragmentManager.findFragmentByTag(FragmentBB::class.simpleName) as? FragmentBB }
+                ?: FragmentBB()
+
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_b_a_container, fragmentBA, FragmentBA::class.simpleName)
+                .replace(R.id.fragment_b_b_container, fragmentBB, FragmentBB::class.simpleName)
+                .addToBackStack(null)
+                .commit()
+        } else {
+            fragmentBA = savedInstanceState
+                ?.let { supportFragmentManager.findFragmentByTag(FragmentBA::class.simpleName) as? FragmentBA }
+                ?: FragmentBA()
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_b_a_container, fragmentBA, FragmentBA::class.simpleName)
+                .addToBackStack(null)
+                .commit()
+        }
+
+
+    }
+
+
+}

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 androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+import otus.gpb.homework.fragments.databinding.FragmentABinding
+
+
+class FragmentA : Fragment() {
+    private var _binding: FragmentABinding? = null
+
+    private val binding get() = _binding!!
+
+    private lateinit var fragmentAA: FragmentAA
+
+    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
+                    requireActivity().onBackPressedDispatcher.onBackPressed()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(callback)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentABinding.inflate(inflater, container, false)
+        val root: View = binding.root
+        return root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        fragmentAA = if (savedInstanceState == null) {
+            FragmentAA.newInstance(ColorGenerator.generateColor())
+        } else {
+            childFragmentManager.findFragmentByTag("fragmentAA") as FragmentAA
+        }
+        with(binding) {
+            fragmentAAButton.setOnClickListener {
+                childFragmentManager.beginTransaction()
+                    .replace(fragmentAContainer.id, fragmentAA, "fragmentAA")
+                    .addToBackStack("fragmentA")
+                    .commit()
+            }
+        }
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance() = FragmentA()
+    }
+}

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

@@ -0,0 +1,68 @@
+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 otus.gpb.homework.fragments.databinding.FragmentAABinding
+
+const val COLOR_ARG_PARAM = "color"
+
+class FragmentAA : Fragment() {
+
+    private var _binding: FragmentAABinding? = null
+
+    private val binding get() = _binding!!
+
+    private lateinit var fragmentAB: FragmentAB
+
+    private var color: Int = Color.CYAN
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(COLOR_ARG_PARAM)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentAABinding.inflate(inflater, container, false)
+        val root: View = binding.root
+        binding.root.setBackgroundColor(color)
+        return root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        fragmentAB = if (savedInstanceState == null) {
+            FragmentAB.newInstance(ColorGenerator.generateColor())
+        } else {
+            parentFragmentManager.findFragmentByTag("fragmentAB") as FragmentAB
+        }
+        with(binding) {
+            fragmentABButton.setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(fragmentAAContainer.id, fragmentAB, "fragmentAB")
+                    .addToBackStack("fragmentA").commit()
+            }
+        }
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(param1: Int) = FragmentAA().apply {
+            arguments = Bundle().apply {
+                putInt(COLOR_ARG_PARAM, param1)
+            }
+        }
+    }
+}

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

@@ -0,0 +1,50 @@
+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 otus.gpb.homework.fragments.databinding.FragmentABBinding
+
+class FragmentAB : Fragment() {
+
+
+    private var _binding: FragmentABBinding? = null
+    private val binding get() = _binding!!
+
+    private var color: Int = Color.CYAN
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(COLOR_ARG_PARAM)
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentABBinding.inflate(inflater, container, false)
+        val root: View = binding.root
+        binding.root.setBackgroundColor(color)
+        return root
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(param1: Int) =
+            FragmentAB().apply {
+                arguments = Bundle().apply {
+                    putInt(COLOR_ARG_PARAM, param1)
+                }
+            }
+    }
+}

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

@@ -0,0 +1,58 @@
+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
+import otus.gpb.homework.fragments.databinding.FragmentBABinding
+import otus.gpb.homework.fragments.utils.COLOR_RESULT_BUNDLE_KEY_BB_TO_BA
+import otus.gpb.homework.fragments.utils.COLOR_RESULT_KEY_BB_TO_BA
+
+
+class FragmentBA : Fragment() {
+    private var _binding: FragmentBABinding? = null
+    private val binding get() = _binding!!
+
+    private lateinit var fragmentBB: FragmentBB
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        _binding = FragmentBABinding.inflate(inflater, container, false)
+        val root: View = binding.root
+        return root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        fragmentBB = savedInstanceState
+            ?.let {
+                parentFragmentManager.getFragment(savedInstanceState, "fragmentBB") as? FragmentBB
+            }
+            ?: FragmentBB()
+
+        setFragmentResultListener(COLOR_RESULT_KEY_BB_TO_BA) { _, bundle ->
+            val color: Int = bundle.getInt(COLOR_RESULT_BUNDLE_KEY_BB_TO_BA)
+            binding.root.setBackgroundColor(color)
+        }
+
+        binding.fragmentBBButton?.setOnClickListener {
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.fragment_b_a_container, fragmentBB, FragmentBB::class.simpleName)
+                .addToBackStack(null)
+                .commit()
+        }
+
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+
+
+}