Выполнение домашнего задания Activity #1.

app/src/main/AndroidManifest.xml

@@ -7,10 +7,31 @@
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@mipmap/ic_launcher"
-        android:label="@string/app_name"
+        android:label=""
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.Activities"
-        tools:targetApi="31" />
-
+        android:theme="@style/Theme.LaunchMode"
+        tools:targetApi="31">
+        <activity
+            android:name=".ActivityB"
+            android:exported="false"
+            android:taskAffinity="abc.abc"/>
+        <activity
+            android:name=".ActivityC"
+            android:taskAffinity="abc.abc"
+            android:exported="false"/>
+        <activity
+            android:name=".ActivityD"
+            android:taskAffinity="abc.abc"
+            android:exported="false"/>
+        <activity
+            android:name=".ActivityA"
+            android:launchMode="singleTask"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
 </manifest>

app/src/main/kotlin/otus/gpb/homework/activities/ActivityA.kt

@@ -0,0 +1,25 @@
+package otus.gpb.homework.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.widget.Button
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class ActivityA : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_a)
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.a)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+        findViewById<Button>(R.id.button).setOnClickListener {
+            startActivity(Intent(this, ActivityB::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
+        }
+    }
+}

app/src/main/kotlin/otus/gpb/homework/activities/ActivityB.kt

@@ -0,0 +1,25 @@
+package otus.gpb.homework.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.widget.Button
+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.b)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+        findViewById<Button>(R.id.button).setOnClickListener {
+            startActivity(Intent(this, ActivityC::class.java))
+        }
+    }
+}

app/src/main/kotlin/otus/gpb/homework/activities/ActivityC.kt

@@ -0,0 +1,34 @@
+package otus.gpb.homework.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.widget.Button
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class ActivityC : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_c)
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.c)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+        findViewById<Button>(R.id.button_OpenActivityA).setOnClickListener {
+            startActivity(Intent(this, ActivityA::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
+        }
+        findViewById<Button>(R.id.button_OpenActivityD).setOnClickListener {
+            startActivity(Intent(this, ActivityD::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK))
+        }
+        findViewById<Button>(R.id.button_CloseActivityC).setOnClickListener {
+            finish()
+        }
+        findViewById<Button>(R.id.button_CloseStack).setOnClickListener {
+             finishAffinity()
+        }
+    }
+}

app/src/main/kotlin/otus/gpb/homework/activities/ActivityD.kt

@@ -0,0 +1,20 @@
+package otus.gpb.homework.activities
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class ActivityD : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContentView(R.layout.activity_d)
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.d)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+    }
+}

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

@@ -0,0 +1,20 @@
+<?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/a"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#f44336"
+    tools:context=".ActivityA">
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Open ActivityB"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,20 @@
+<?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"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/b"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ActivityB"
+    android:background="#4caf50">
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Open ActivityC"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,50 @@
+<?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/c"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#2196f3"
+    tools:context=".ActivityC">
+
+    <Button
+        android:id="@+id/button_OpenActivityA"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="Open ActivityA"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"/>
+
+    <Button
+        android:id="@+id/button_OpenActivityD"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="Open ActivityD"
+        app:layout_constraintEnd_toEndOf="@+id/button_OpenActivityA"
+        app:layout_constraintStart_toStartOf="@+id/button_OpenActivityA"
+        app:layout_constraintTop_toBottomOf="@+id/button_OpenActivityA"/>
+
+    <Button
+        android:id="@+id/button_CloseActivityC"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="Close ActivityC"
+        app:layout_constraintEnd_toEndOf="@+id/button_OpenActivityD"
+        app:layout_constraintStart_toStartOf="@+id/button_OpenActivityD"
+        app:layout_constraintTop_toBottomOf="@+id/button_OpenActivityD"/>
+
+    <Button
+        android:id="@+id/button_CloseStack"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="Close Stack"
+        app:layout_constraintEnd_toEndOf="@+id/button_CloseActivityC"
+        app:layout_constraintStart_toStartOf="@+id/button_CloseActivityC"
+        app:layout_constraintTop_toBottomOf="@+id/button_CloseActivityC"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,10 @@
+<?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/d"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ActivityD"
+    android:background="#ffeb3b">
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/themes.xml

@@ -1,16 +1,9 @@
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
-    <style name="Theme.Activities" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
-        <!-- Primary brand color. -->
-        <item name="colorPrimary">@color/purple_500</item>
-        <item name="colorPrimaryVariant">@color/purple_700</item>
-        <item name="colorOnPrimary">@color/white</item>
-        <!-- Secondary brand color. -->
-        <item name="colorSecondary">@color/teal_200</item>
-        <item name="colorSecondaryVariant">@color/teal_700</item>
-        <item name="colorOnSecondary">@color/black</item>
-        <!-- Status bar color. -->
-        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
-        <!-- Customize your theme here. -->
+    <style name="Base.Theme.LaunchMode" parent="Theme.Material3.DayNight.NoActionBar">
+        <!-- Customize your light theme here. -->
+        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
     </style>
+
+    <style name="Theme.LaunchMode" parent="Base.Theme.LaunchMode" />
 </resources>