**Course Title:** Kotlin Programming: From Basics to Advanced Techniques **Section Title:** Coroutines and Asynchronous Programming **Topic:** Develop a Kotlin application that utilizes coroutines for asynchronous tasks.(Lab topic) In this lab topic, we will put our knowledge of coroutines into practice by developing a Kotlin application that utilizes coroutines for asynchronous tasks. We will explore how to launch coroutines, manage scopes, and handle asynchronous tasks using suspending functions. **Prerequisites:** Before diving into this lab topic, ensure that you have a good understanding of the following concepts: * Introduction to coroutines: concepts and benefits * Launching coroutines and managing scopes * Using suspending functions and structured concurrency * Handling asynchronous tasks with coroutines **Objective:** By the end of this lab topic, you will be able to: * Create a Kotlin application that utilizes coroutines for asynchronous tasks * Launch coroutines and manage scopes using coroutine builders (e.g., `launch`, `async`, `runBlocking`) * Use suspending functions and structured concurrency to handle asynchronous tasks * Handle asynchronous tasks using coroutine scopes and suspend functions **Lab Task:** Create a Kotlin application that simulates a network request using a coroutine. The application should have a UI that displays a button labeled "Make Request". When the button is clicked, the application should launch a coroutine that simulates a network request. The coroutine should take around 5 seconds to complete and then display the result in the UI. **Step 1: Create the Project** Create a new Kotlin project in IntelliJ IDEA or Android Studio. Choose the "Empty Project" template and set the project SDK to 1.8 or later. **Step 2: Add Dependencies** Add the following dependencies to your `build.gradle` file: ```groovy dependencies { implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.0' } ``` **Step 3: Create the UI** Create a new `MainActivity` class and set up a simple UI with a button: ```kotlin import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View import android.widget.Button import android.widget.TextView class MainActivity : AppCompatActivity() { private lateinit var textView: TextView private lateinit var button: Button override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) textView = findViewById(R.id.textView) button = findViewById(R.id.button) button.setOnClickListener { makeRequest() } } private fun makeRequest() { // Launch a coroutine to simulate a network request } } ``` **Step 4: Launch a Coroutine** Launch a coroutine using the `launch` coroutine builder and simulate a network request using the `delay` suspend function: ```kotlin import kotlinx.coroutines.* private fun makeRequest() { CoroutineScope(Job()).launch { try { val result = simulateNetworkRequest() updateUI(result) } catch (e: Exception) { Log.e("MainActivity", e.message, e) } } } private suspend fun simulateNetworkRequest(): String { delay(5000) return "Network request completed" } private fun updateUI(result: String) { textView.text = result } ``` **Step 5: Run the Application** Run the application on a physical device or emulator. Click the "Make Request" button and observe how the coroutine simulates a network request and updates the UI after 5 seconds. **Result:** You have now created a Kotlin application that utilizes coroutines for asynchronous tasks. The application launches a coroutine to simulate a network request and updates the UI after the request is completed. **What's Next:** In the next topic, we will explore an overview of Android development with Kotlin. **For Further Reading:** * [Kotlin Coroutines Documentation](https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-coroutine-scope/index.html) * [Android Developer Documentation: Coroutines](https://developer.android.com/kotlin/coroutines) **Do You Have Any Questions?** Please leave a comment below if you have any questions or need help with this lab topic.