homework fragments

app/build.gradle

@@ -3,10 +3,6 @@ plugins {
     id 'org.jetbrains.kotlin.android'
 }
 
-kotlin {
-    jvmToolchain(17)
-}
-
 android {
     compileSdk 34
     namespace "otus.gpb.homework.fragments"
@@ -34,6 +30,9 @@ android {
     kotlinOptions {
         jvmTarget = '17'
     }
+    viewBinding {
+        enabled = true
+    }
 }
 
 dependencies {
@@ -42,6 +41,7 @@ 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:1.9.3'
     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=".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 +1,28 @@
+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)
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragmentContainer, FragmentA())
+            .addToBackStack("FragmentA")
+            .commit()
+    }
+}

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

@@ -0,0 +1,44 @@
+package otus.gpb.homework.fragments
+
+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() {
+
+        if (ScreenOrientationHelper.getScreenOrientation(resources) == "PORTRAIT") {
+            with(binding) {
+                fragmentContainerBA.isVisible = true
+                fragmentContainerBB.isVisible = false
+            }
+
+        } else {
+            with(binding) {
+                fragmentContainerBA.isVisible = true
+                fragmentContainerBB.isVisible = true
+            }
+        }
+    }
+}

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

@@ -1,12 +1,28 @@
 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)
+
+        with(binding) {
+            openActivityA.setOnClickListener {
+                startActivity(Intent(applicationContext, ActivityA::class.java))
+            }
+            openActivityB.setOnClickListener {
+                startActivity(Intent(applicationContext, ActivityB::class.java))
+            }
+        }
     }
-}
+}
+

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

@@ -0,0 +1,15 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.content.res.Resources
+
+object ScreenOrientationHelper {
+
+    fun getScreenOrientation(resources: Resources): String {
+        return when (resources.configuration.orientation) {
+            Configuration.ORIENTATION_PORTRAIT -> "PORTRAIT"
+            Configuration.ORIENTATION_LANDSCAPE -> "LANDSCAPE"
+            else -> ""
+        }
+    }
+}

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

@@ -0,0 +1,34 @@
+package otus.gpb.homework.fragments.fragments
+
+import android.os.Bundle
+import android.view.View
+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
+
+class FragmentA : Fragment(R.layout.fragment_a) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+
+        val bundle = Bundle()
+        bundle.putInt("color", ColorGenerator.generateColor())
+        val fragmentAA = FragmentAA()
+        fragmentAA.arguments = bundle
+
+        view.findViewById<Button>(R.id.openFragmentAA).setOnClickListener {
+            childFragmentManager.beginTransaction()
+                .add(R.id.fragmentContainerAA, fragmentAA)
+                .addToBackStack("fragmentA")
+                .commit()
+        }
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+               activity?.finish()
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, callback)
+    }
+}

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

@@ -0,0 +1,41 @@
+package otus.gpb.homework.fragments.fragments
+
+import android.os.Bundle
+import android.view.View
+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
+
+class FragmentAA : Fragment(R.layout.fragment_a_a) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val color = arguments?.getInt("color")
+
+        if (color != null) {
+            this.view?.setBackgroundColor(color)
+        }
+
+        val bundle = Bundle()
+        bundle.putInt("color", ColorGenerator.generateColor())
+        val fragmentAB = FragmentAB()
+        fragmentAB.arguments = bundle
+
+        view.findViewById<Button>(R.id.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)
+    }
+}

app/src/main/java/otus/gpb/homework/fragments/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
+
+class FragmentAB : Fragment(R.layout.fragment_a_b) {
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val color = arguments?.getInt("color")
+
+        if (color != null) {
+            this.view?.setBackgroundColor(color)
+        }
+
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                parentFragmentManager.popBackStack("fragmentAA", 1)
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, callback)
+    }
+}

app/src/main/java/otus/gpb/homework/fragments/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)

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

@@ -0,0 +1,32 @@
+package otus.gpb.homework.fragments.fragments
+
+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
+import otus.gpb.homework.fragments.ScreenOrientationHelper
+
+class FragmentBA : Fragment(R.layout.fragment_b_a) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        parentFragmentManager.setFragmentResultListener("colorBundle", this) { _, bundle ->
+            val color = bundle.getInt("color")
+            this.view?.setBackgroundColor(color)
+        }
+
+        with(view.findViewById<Button>(R.id.openFragmentBB)) {
+
+            setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.fragmentContainerBA, FragmentBB())
+                    .commit()
+            }
+
+            isVisible = ScreenOrientationHelper.getScreenOrientation(resources) == "PORTRAIT"
+        }
+    }
+}

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

@@ -0,0 +1,29 @@
+package otus.gpb.homework.fragments.fragments
+
+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
+import otus.gpb.homework.fragments.ScreenOrientationHelper
+
+class FragmentBB : Fragment(R.layout.fragment_b_b) {
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        view.findViewById<Button>(R.id.sendColor).setOnClickListener {
+
+            val bundle = Bundle()
+            bundle.putInt("color", ColorGenerator.generateColor())
+
+            parentFragmentManager.setFragmentResult("colorBundle", bundle)
+
+            if (ScreenOrientationHelper.getScreenOrientation(resources) == "PORTRAIT") {
+                parentFragmentManager.beginTransaction()
+                    .add(R.id.fragmentContainerBA, FragmentBA())
+                    .commit()
+            }
+        }
+    }
+}

app/src/main/res/layout/activity_a.xml

@@ -0,0 +1,15 @@
+<?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:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ActivityA">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentContainer"
+
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>