Homework_Fragments

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 +1,16 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityA : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_a)
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.activity_a, FragmentA())
+            .commit()
+    }
+}

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

@@ -0,0 +1,16 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityB : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_b)
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.activity_b, FragmentB())
+            .commit()
+    }
+}

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

@@ -0,0 +1,54 @@
+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 com.google.android.material.button.MaterialButton
+
+class FragmentA : Fragment() {
+
+    private fun generateBackgroundColor() = ColorGenerator.generateColor()
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 1) childFragmentManager.popBackStack()
+                else {
+                    isEnabled = false
+                    requireActivity().onBackPressedDispatcher.onBackPressed()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, callback)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<MaterialButton>(R.id.fragment_a_btn).setOnClickListener {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_aa, FragmentAA.newInstance(generateBackgroundColor()))
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+
+    fun createFragmentAB() {
+        childFragmentManager.beginTransaction()
+            .replace(R.id.fragment_aa, FragmentAB.newInstance(generateBackgroundColor()))
+            .addToBackStack(null)
+            .commit()
+    }
+}

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

@@ -0,0 +1,41 @@
+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 com.google.android.material.button.MaterialButton
+
+private const val COLOR_ARG = "color_arg"
+
+class FragmentAA : Fragment() {
+
+    private fun getBackgroundColor() = arguments?.getInt(COLOR_ARG) ?: Color.WHITE
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_aa, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(getBackgroundColor())
+        view.findViewById<MaterialButton>(R.id.fragment_ab_btn).setOnClickListener {
+            (parentFragment as FragmentA).createFragmentAB()
+        }
+    }
+
+    companion object {
+        fun newInstance(color: Int): FragmentAA {
+            fun setBundleArgument() = Bundle().apply { putInt(COLOR_ARG, color) }
+            return FragmentAA().apply {
+                arguments = setBundleArgument()
+            }
+        }
+    }
+}

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

@@ -0,0 +1,37 @@
+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
+
+private const val COLOR_ARG = "color_arg"
+
+class FragmentAB : Fragment() {
+
+    private fun getBackgroundColor() = arguments?.getInt(COLOR_ARG) ?: Color.WHITE
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ab, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(getBackgroundColor())
+    }
+
+    companion object {
+        fun newInstance(color: Int): FragmentAB {
+            fun setBundleArgument () = Bundle().apply { putInt(COLOR_ARG, color) }
+            return FragmentAB().apply {
+                arguments = setBundleArgument()
+            }
+        }
+    }
+}

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

@@ -0,0 +1,31 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+
+class FragmentB : Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_ba, FragmentBA())
+                .replace(R.id.fragment_bb, FragmentBB())
+                .addToBackStack(null)
+                .commit()
+            return inflater.inflate(R.layout.activity_b_land, container, false)
+        } else {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.activity_b, FragmentBA())
+                .addToBackStack(null)
+                .commit()
+            return inflater.inflate(R.layout.activity_b, container, false)
+        }
+    }
+}

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

@@ -0,0 +1,46 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+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 com.google.android.material.button.MaterialButton
+
+private const val COLOR_ARG = "color_arg"
+private const val FRAGMENT_REQUESTED_COLOR = "fr_req_color"
+
+class FragmentBA : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ba, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        parentFragmentManager.setFragmentResultListener(FRAGMENT_REQUESTED_COLOR, this) { _, bundle ->
+            val backgroundColor = bundle.getInt(COLOR_ARG, Color.WHITE)
+            view.setBackgroundColor(backgroundColor)
+        }
+
+        val openBbBtn = view.findViewById<MaterialButton>(R.id.fragment_bb_btn)
+
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            openBbBtn.visibility = View.GONE
+        } else {
+            openBbBtn.setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.activity_b, FragmentBB())
+                    .addToBackStack(null)
+                    .commit()
+            }
+        }
+    }
+}

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

@@ -0,0 +1,36 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.google.android.material.button.MaterialButton
+
+private const val COLOR_ARG = "color_arg"
+private const val FRAGMENT_REQUESTED_COLOR = "fr_req_color"
+
+class FragmentBB : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_bb, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<MaterialButton>(R.id.send_color_btn).setOnClickListener {
+            val result = Bundle().apply { putInt(COLOR_ARG, ColorGenerator.generateColor()) }
+            parentFragmentManager.setFragmentResult(FRAGMENT_REQUESTED_COLOR, result)
+
+            if (resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+                parentFragmentManager.popBackStack()
+            }
+        }
+
+    }
+}

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

@@ -1,12 +1,22 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.button.MaterialButton
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        findViewById<MaterialButton>(R.id.activity_a_btn).setOnClickListener {
+            startActivity(Intent(this, ActivityA::class.java))
+        }
+
+        findViewById<MaterialButton>(R.id.activity_b_btn).setOnClickListener {
+            startActivity(Intent(this, ActivityB::class.java))
+        }
     }
-}
+}

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

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/activity_b"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="horizontal"
+    android:showDividers="middle">
+
+    <FrameLayout
+        android:id="@+id/fragment_ba"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+    <View
+        android:layout_width="2dp"
+        android:layout_height="match_parent"
+        android:background="@color/black" />
+
+    <FrameLayout
+        android:id="@+id/fragment_bb"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+</LinearLayout>

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/activity_a"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ActivityA">
+</FrameLayout>

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

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