homework Fragments

app/build.gradle

@@ -4,16 +4,19 @@ plugins {
 }
 
 android {
-    compileSdk 32
+    compileSdk 34
 
     defaultConfig {
         applicationId "otus.gpb.homework.fragments"
         minSdk 23
-        targetSdk 32
+        targetSdk 34
         versionCode 1
         versionName "1.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        vectorDrawables {
+            useSupportLibrary true
+        }
     }
 
     buildTypes {

app/src/main/AndroidManifest.xml

@@ -13,6 +13,9 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Fragments"
         tools:targetApi="31">
+        <activity
+            android:name=".FragmentBActivity"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">

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

@@ -0,0 +1,56 @@
+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 android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+
+
+class FragmentA : Fragment() {
+    private lateinit var buttonOpenFragmentAA: Button
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        buttonOpenFragmentAA = view.findViewById(R.id.buttonOpenFragmentAA)
+        buttonOpenFragmentAA.setOnClickListener {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.container_aa, FragmentAA.newInstance(ColorGenerator.generateColor()))
+                .addToBackStack("fragmentA")
+                .commit()
+            buttonOpenFragmentAA.visibility = View.GONE
+        }
+    }
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 0) {
+                    childFragmentManager.popBackStack()
+                } else {
+                    isEnabled = true
+                    requireActivity().finish()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, callback)
+
+        childFragmentManager.addOnBackStackChangedListener {
+            if (childFragmentManager.backStackEntryCount == 0) {
+                buttonOpenFragmentAA.visibility = View.VISIBLE
+            }
+        }
+    }
+}

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

@@ -0,0 +1,97 @@
+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 android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+
+
+private const val KEY_COLOR = "color"
+
+
+/**
+ * A simple [Fragment] subclass.
+ * Use the [FragmentAA.newInstance] factory method to
+ * create an instance of this fragment.
+ */
+class FragmentAA : Fragment() {
+
+    private var color: Int? = null
+    private lateinit var buttonOpenFragmentAB: Button
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        arguments?.let {
+            color = it.getInt(KEY_COLOR)
+        }
+
+
+    }
+
+    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)
+
+        val colorHex = color
+        if (colorHex != null) {
+            view.setBackgroundColor(colorHex)
+        }
+
+        buttonOpenFragmentAB = view.findViewById(R.id.buttonOpenFragmentAB)
+        buttonOpenFragmentAB.setOnClickListener {
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.container_aa, FragmentAA.newInstance(ColorGenerator.generateColor()))
+                .addToBackStack("fragmentA")
+                .commit()
+            buttonOpenFragmentAB.visibility = View.GONE
+        }
+
+    }
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (parentFragmentManager.backStackEntryCount > 0) {
+                    parentFragmentManager.popBackStack()
+                } else {
+                    isEnabled = false
+                    parentFragmentManager.beginTransaction().remove(this@FragmentAA)
+                        .commitAllowingStateLoss()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, callback)
+    }
+
+    companion object {
+        /**
+         * Use this factory method to create a new instance of
+         * this fragment using the provided parameters.
+         *
+         * @param color Parameter 1.
+         * @return A new instance of fragment FragmentAA.
+         */
+
+        @JvmStatic
+        fun newInstance(color: Int) =
+            FragmentAA().apply {
+                arguments = Bundle().apply {
+                    putInt(KEY_COLOR, color)
+                }
+            }
+    }
+}

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

@@ -0,0 +1,39 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import otus.gpb.homework.fragments.ui.FragmentBA
+import otus.gpb.homework.fragments.ui.FragmentBB
+
+class FragmentBActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_fragment_b)
+
+        val fragmentBA = FragmentBA()
+        val fragmentBB = FragmentBB()
+
+        val orientation = resources.configuration.orientation
+        if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+//            supportFragmentManager.beginTransaction().add(R.id.fragment_container_ba, fragmentBA)
+//                .commit()
+//            supportFragmentManager.beginTransaction().add(R.id.fragment_container_bb, fragmentBB)
+//                .commit()
+
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.fragment_container_ba, fragmentBA)
+                .replace(R.id.fragment_container_bb, fragmentBB)
+                .commit()
+        }
+        if (orientation == Configuration.ORIENTATION_PORTRAIT) {
+            supportFragmentManager.beginTransaction().add(R.id.activity_fragment_b, fragmentBA)
+                .commit()
+        }
+    }
+
+    companion object {
+        const val KEY_COLOR = "color"
+        const val KEY_REQUEST = "request_key"
+    }
+}

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

@@ -1,12 +1,42 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
+import android.view.View
+import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var buttonFragmentA: Button
+    private lateinit var buttonFragmentB: Button
+    private lateinit var fragmentA: FragmentA
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        buttonFragmentA = findViewById(R.id.button_fragment_a)
+        buttonFragmentB = findViewById(R.id.button_fragment_b)
+
+        buttonFragmentA.setOnClickListener {
+            fragmentA = FragmentA()
+            supportFragmentManager.beginTransaction()
+                .add(R.id.fragment_container, fragmentA)
+                .commit()
+            buttonFragmentA.visibility = View.GONE
+            buttonFragmentB.visibility = View.GONE
+        }
+
+        buttonFragmentB.setOnClickListener {
+            startActivity(Intent(this, FragmentBActivity::class.java))
+        }
+
+        supportFragmentManager.addOnBackStackChangedListener {
+            val count = supportFragmentManager.backStackEntryCount
+            if (count == 0) {
+                buttonFragmentA.visibility = View.VISIBLE
+                buttonFragmentB.visibility = View.VISIBLE
+            }
+        }
     }
 }

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

@@ -0,0 +1,39 @@
+package otus.gpb.homework.fragments.ui
+
+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.FragmentBActivity
+import otus.gpb.homework.fragments.R
+
+
+class FragmentBA : Fragment(R.layout.fragment_b_a) {
+
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        requireActivity().supportFragmentManager.setFragmentResultListener(
+            FragmentBActivity.KEY_REQUEST,
+            this
+        ) { _, bundle ->
+            val result = bundle.getInt(FragmentBActivity.KEY_COLOR)
+            view.setBackgroundColor(result)
+        }
+
+        val orientation = resources.configuration.orientation
+        val button = view.findViewById<Button>(R.id.buttonOpenFragmentBB)
+        if (orientation == Configuration.ORIENTATION_PORTRAIT) {
+            button.visibility = View.VISIBLE
+            button.text = "FragmentBB"
+            button.setOnClickListener() {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.activity_fragment_b, FragmentBB()).addToBackStack(null).commit()
+            }
+        } else {
+            button.visibility = View.GONE
+        }
+    }
+}

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

@@ -0,0 +1,41 @@
+package otus.gpb.homework.fragments.ui
+
+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 FragmentBB : Fragment(R.layout.fragment_b_b) {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        requireActivity().onBackPressedDispatcher.addCallback(this,
+            object : OnBackPressedCallback(true) {
+                override fun handleOnBackPressed() {
+                    val count = parentFragmentManager.backStackEntryCount
+                    parentFragmentManager.popBackStack()
+                    if (count == 0) {
+                        requireActivity().finish()
+                    }
+                }
+            }
+        )
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        val button: Button = view.findViewById(R.id.buttonSendColor)
+
+        button.setOnClickListener() {
+            val bundle = Bundle()
+            bundle.putInt("color", ColorGenerator.generateColor())
+            requireActivity().supportFragmentManager
+                .setFragmentResult("request_key", bundle)
+        }
+    }
+}

app/src/main/res/layout-land/activity_fragment_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/fragment_container_ba"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_container_bb"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+</LinearLayout>

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

@@ -0,0 +1,9 @@
+<?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"
+    android:id="@+id/activity_fragment_b"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:context=".FragmentBActivity">
+
+</FrameLayout>