hm 1

app/build.gradle

@@ -56,4 +56,6 @@ dependencies {
     implementation 'androidx.core:core-ktx:1.13.1'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.google.android.material:material:1.12.0'
+    implementation 'androidx.activity:activity:1.8.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
 }

app/src/main/AndroidManifest.xml

@@ -11,6 +11,29 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Activities"
-        tools:targetApi="31" />
+        tools:targetApi="31">
+        <activity
+            android:name=".ActivityD"
+            android:exported="false"
+            android:taskAffinity="Task.Two"/>
+        <activity
+            android:name=".ActivityC"
+            android:exported="false"
+            android:taskAffinity="Task.Two"/>
+        <activity
+            android:name=".ActivityB"
+            android:exported="false"
+            android:taskAffinity="Task.Two"/>
+        <activity
+            android:name=".ActivityA"
+            android:exported="true"
+            android:taskAffinity="Task.One"
+            android:launchMode="singleTop">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
 
 </manifest>

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

@@ -0,0 +1,30 @@
+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.main)) { 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 {
+            //OPEN ACTIVITY B
+            val intent = Intent(this, ActivityB::class.java)
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            startActivity(intent)
+        }
+    }
+}

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

@@ -0,0 +1,29 @@
+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.main)) { 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 {
+            //OPEN ACTIVITY С
+            val intent = Intent(this, ActivityC::class.java)
+            startActivity(intent)
+        }
+    }
+}

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

@@ -0,0 +1,46 @@
+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.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+
+        findViewById<Button>(R.id.button1).setOnClickListener {
+            //OPEN ACTIVITY A
+            val intent = Intent(this, ActivityA::class.java)
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            startActivity(intent)
+        }
+
+        findViewById<Button>(R.id.button2).setOnClickListener {
+            //OPEN ACTIVITY D
+            val intent = Intent(this, ActivityD::class.java)
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
+            startActivity(intent)
+        }
+
+        findViewById<Button>(R.id.button3).setOnClickListener {
+            //Close ACTIVITY C
+            finish()
+        }
+
+        findViewById<Button>(R.id.button4).setOnClickListener {
+            //Close Stack
+            finishAffinity()
+        }
+    }
+}

app/src/main/java/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.main)) { 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/main"
+    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="@string/open_activity_b"
+        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 +1,22 @@
+<?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"
+    android:background="#4caf50"
+    tools:context=".ActivityB">
+
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_activity_c"
+        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 +1,51 @@
+<?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"
+    android:background="#2196f3"
+    tools:context=".ActivityC">
+
+    <Button
+        android:id="@+id/button1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_activity_a"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="@id/button2"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <Button
+        android:id="@+id/button2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/open_activity_d"
+        app:layout_constraintTop_toTopOf="@id/button1"
+        app:layout_constraintBottom_toBottomOf="@id/button3"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <Button
+        android:id="@+id/button3"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/close_activity_c"
+        app:layout_constraintTop_toTopOf="@id/button2"
+        app:layout_constraintBottom_toBottomOf="@id/button4"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <Button
+        android:id="@+id/button4"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/close_stack"
+        app:layout_constraintTop_toTopOf="@id/button3"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,11 @@
+<?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"
+    android:background="#ffeb3b"
+    tools:context=".ActivityD">
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -1,3 +1,10 @@
 <resources>
     <string name="app_name">Activities</string>
+
+    <string name="open_activity_a">Open Activity A</string>
+    <string name="open_activity_b">Open Activity B</string>
+    <string name="open_activity_c">Open Activity C</string>
+    <string name="open_activity_d">Open Activity D</string>
+    <string name="close_activity_c">Close Activity C</string>
+    <string name="close_stack">Close Stack</string>
 </resources>