Homework

app/build.gradle

@@ -42,6 +42,7 @@ 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:1.8.0'
     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 +1,29 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.activity.addCallback
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityA : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_a)
+
+        if (savedInstanceState == null) {
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.container_a, FragmentA(), "FragmentA_Tag").commit()
+        }
+
+        onBackPressedDispatcher.addCallback(this) {
+            val fragmentA = supportFragmentManager.findFragmentByTag("FragmentA_Tag")
+            val childStackCount = fragmentA?.childFragmentManager?.backStackEntryCount ?: 0
+
+            if (childStackCount > 0) {
+                fragmentA?.childFragmentManager?.popBackStack()
+            } else {
+                finish()
+            }
+        }
+    }
+}

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

@@ -0,0 +1,20 @@
+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 ActivityB : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_b)
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+    }
+}

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

@@ -0,0 +1,30 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import androidx.fragment.app.Fragment
+
+class FragmentA : Fragment(R.layout.fragment_a) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        val buttonOpenAA = view.findViewById<Button>(R.id.btnOpenAA)
+
+        buttonOpenAA.setOnClickListener {
+            val fragmentAA = FragmentAA()
+
+            val color = ColorGenerator.generateColor()
+
+            val args = Bundle()
+            args.putInt("color_key", color)
+            fragmentAA.arguments = args
+
+            childFragmentManager.beginTransaction()
+                .replace(R.id.child_container, fragmentAA)
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+}

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

@@ -0,0 +1,28 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import androidx.fragment.app.Fragment
+
+class FragmentAA : Fragment(R.layout.fragment_aa) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val color = arguments?.getInt("color_key") ?: 0
+        view.setBackgroundColor(color)
+
+        val buttonOpenAB = view.findViewById<Button>(R.id.btnOpenAB)
+        buttonOpenAB.setOnClickListener {
+            val fragmentAB = FragmentAB()
+            val bundle = Bundle()
+            bundle.putInt("color_key", ColorGenerator.generateColor())
+            fragmentAB.arguments = bundle
+
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.child_container, fragmentAB)
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+}

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

@@ -0,0 +1,13 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.View
+import androidx.fragment.app.Fragment
+
+class FragmentAB : Fragment(R.layout.fragment_ab) {
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        val color = arguments?.getInt("color_key") ?: 0
+        view.setBackgroundColor(color)
+    }
+}

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

@@ -0,0 +1,31 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import androidx.fragment.app.Fragment
+
+class FragmentBA : Fragment(R.layout.fragment_ba) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        val btnOpenBB = view.findViewById<Button>(R.id.btnOpenBB)
+
+        btnOpenBB?.setOnClickListener {
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.container_b, FragmentBB())
+                .addToBackStack(null)
+                .commit()
+        }
+
+        parentFragmentManager.setFragmentResultListener("color_request", viewLifecycleOwner) { _, bundle ->
+            val color = bundle.getInt("color_result")
+            view.setBackgroundColor(color)
+        }
+
+        if (activity?.findViewById<View>(R.id.container_bb) != null) {
+            btnOpenBB?.visibility = View.GONE
+        }
+    }
+}

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

@@ -0,0 +1,26 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import android.view.View
+import android.widget.Button
+import androidx.fragment.app.Fragment
+
+class FragmentBB : Fragment(R.layout.fragment_bb) {
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        val btnGenerate = view.findViewById<Button>(R.id.btnGenerateColor)
+
+        btnGenerate.setOnClickListener {
+            val color = ColorGenerator.generateColor()
+            val result = Bundle().apply { putInt("color_result", color) }
+
+            parentFragmentManager.setFragmentResult("color_request", result)
+
+            if (activity?.findViewById<View>(R.id.container_b) != null) {
+                parentFragmentManager.popBackStack()
+            }
+        }
+    }
+}

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 android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
+import kotlin.jvm.java
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        val btnTask1 = findViewById<Button>(R.id.btnTask1)
+        val btnTask2 = findViewById<Button>(R.id.btnTask2)
+
+        btnTask1.setOnClickListener {
+            val intent = Intent(this, ActivityA::class.java)
+            startActivity(intent)
+        }
+
+        btnTask2.setOnClickListener {
+            val intent = Intent(this, ActivityB::class.java)
+            startActivity(intent)
+        }
     }
 }

app/src/main/res/layout-land/activity_b.xml

@@ -0,0 +1,27 @@
+<?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">
+
+    <LinearLayout
+        android:id="@+id/main"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="horizontal">
+
+        <androidx.fragment.app.FragmentContainerView
+            android:id="@+id/container_ba"
+            android:name="otus.gpb.homework.fragments.FragmentBA"
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1" />
+
+        <androidx.fragment.app.FragmentContainerView
+            android:id="@+id/container_bb"
+            android:name="otus.gpb.homework.fragments.FragmentBB"
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_weight="1" />
+    </LinearLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.fragment.app.FragmentContainerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/container_a"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" />

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

@@ -0,0 +1,16 @@
+<?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/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ActivityB">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/container_b"
+        android:name="otus.gpb.homework.fragments.FragmentBA"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -6,13 +6,28 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
+    <Button
+        android:id="@+id/btnTask1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
+        android:text="Задание 1"
+        app:layout_constraintBottom_toTopOf="@+id/btnTask2"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_chainStyle="packed" />
+
+    <Button
+        android:id="@+id/btnTask2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="Задание 2"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toBottomOf="@+id/btnTask1" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,30 @@
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:orientation="vertical">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:text="Fragment A"
+            android:textSize="24sp" />
+
+        <Button
+            android:id="@+id/btnOpenAA"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Открыть Fragment AA" />
+    </LinearLayout>
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/child_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</FrameLayout>

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

@@ -0,0 +1,24 @@
+<?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"
+    android:gravity="center"
+    android:orientation="vertical"
+    android:padding="16dp"
+    tools:context=".FragmentAA">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="Fragment AA"
+        android:textSize="24sp" />
+
+    <Button
+        android:id="@+id/btnOpenAB"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="To Fragment AB" />
+
+</LinearLayout>