**Course Title:** Kotlin Programming: From Basics to Advanced Techniques **Section Title:** Kotlin for Android Development **Topic:** Create a simple Android application using Kotlin that includes UI elements.(Lab topic) **Overview** In this lab, we'll create a simple Android application using Kotlin that includes user interface (UI) elements. We'll cover the basics of Android development with Kotlin and learn how to design and implement a basic UI. **Prerequisites** * Familiarity with Kotlin programming language * Basic understanding of Android development concepts * Android Studio installed on your system **Step 1: Create a new Android project** To start, we'll create a new Android project in Android Studio. Follow these steps: 1. Open Android Studio and click on "Start a new Android Studio project" on the start page. 2. Select "Empty Activity" as the project template. 3. Choose a project name, location, and package name. 4. Select "Kotlin" as the programming language. 5. Click "Finish" to create the project. **Step 2: Design the UI** Next, we'll design a simple UI for our application. We'll create a layout that includes a text view, an edit text, and a button. 1. Open the `activity_main.xml` file in the `res/layout` directory. 2. Delete the existing "Hello, World!" text view. 3. Drag a `TextView` from the palette to the design surface. 4. Set the text property to "Enter your name". 5. Drag an `EditText` from the palette to the design surface. 6. Set the id property to "nameEditText". 7. Drag a `Button` from the palette to the design surface. 8. Set the id property to "submitButton". **Step 3: Create a Kotlin activity class** Now, we'll create a Kotlin activity class to handle the UI interactions. 1. Open the `MainActivity.kt` file in the `java` directory. 2. Import the necessary Android and Kotlin libraries. 3. Define a `MainActivity` class that extends `AppCompatActivity`. 4. Override the `onCreate` method to initialize the UI components. Here's some sample code to get you started: ```kotlin import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View import android.widget.Button import android.widget.EditText import android.widget.TextView class MainActivity : AppCompatActivity() { private lateinit var nameEditText: EditText private lateinit var submitButton: Button private lateinit var greetingTextView: TextView override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) nameEditText = findViewById(R.id.nameEditText) submitButton = findViewById(R.id.submitButton) greetingTextView = findViewById(R.id.greetingTextView) submitButton.setOnClickListener { val name = nameEditText.text.toString() greetingTextView.text = "Hello, $name!" } } } ``` **Step 4: Run the application** Finally, we'll run the application on an emulator or a physical device. 1. Click on the "Run" button or press Shift+F10 to run the application. 2. Select a deployment target (e.g., an emulator or a physical device). 3. Wait for the application to launch on the device. **Conclusion** In this lab, we created a simple Android application using Kotlin that includes UI elements. We designed a basic UI, created a Kotlin activity class, and ran the application on an emulator or a physical device. **What's Next?** In the next topic, we'll explore Kotlin's interoperability with Java. This is an important aspect of Kotlin development, as many Android libraries and frameworks are written in Java. We'll learn how to use Java libraries in Kotlin and vice versa. **External Resources** * Android Developer Documentation: [https://developer.android.com/docs](https://developer.android.com/docs) * Kotlin Programming Language Documentation: [https://kotlinlang.org/docs/index.html](https://kotlinlang.org/docs/index.html) **Ask for Help** If you have any questions or need further clarification on this topic, please leave a comment below.