Android App Dev

Android Application Development with Kotlin

By ningnong

Build Android Application using Kotlin and Java Spring Boot (backend logical programming)

Android Studio using

Android Studio is the official Integrated Development Environment (IDE) for Android app development, developed by Google and JetBrains. It is built on JetBrains' IntelliJ IDEA software and is specifically designed for Android development. Android Studio provides a comprehensive suite of tools and features that enhance productivity and streamline the development process for Android applications.


Jetpack Compose: A Modern UI Toolkit for Android

Jetpack Compose is a modern UI toolkit introduced by Google for building native Android user interfaces. It simplifies and accelerates UI development by leveraging the power of Kotlin and a declarative programming model.


Basic Functions

Jetpack Compose introduces several essential functions to help developers build UIs efficiently:

  • Composable Function: Marked with the @Composable annotation, these functions define the UI components programmatically
  • Preview Function: Annotated with @Preview, this function allows developers to preview their composable functions within the IDE without running the app on an emulator
  • Column and Row Functions: These functions stack UI elements vertically and horizontally, respectively
  • Box: A widget that positions elements relative to its edges, allowing for overlapping elements
  • Spacer: Provides spacing between views by specifying height and width
  • Vertical Scroll: Enables vertical scrolling behavior for views that exceed the screen height
  • Padding: Adds extra white space around specific views
  • Lazy List: Equivalent to a RecyclerView, it efficiently renders only the visible elements on the screen


Practical Example

Here's a simple example to demonstrate how to use Jetpack Compose to create a basic UI component:

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.tooling.preview.Preview

class MainActivity : ComponentActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContent {
      Greeting("Android")
    }
  }
}
      
@Composable
fun Greeting(name: String) {
  Text(text = "Hello, $name!")
}
        
@Preview
@Composable
fun PreviewGreeting() {
  Greeting("Android")
}

In this example, the Greeting function is marked as @Composable, and it displays a simple text. The PreviewGreeting function allows us to preview the Greeting function within the IDE3

Conclusion

Jetpack Compose is a powerful and modern toolkit that simplifies UI development for Android. By using declarative functions and leveraging Kotlin's capabilities, developers can create beautiful and responsive UIs with less code and fewer bugs. Its compatibility with existing views and the ability to preview UI components within the IDE make it an excellent choice for Android developers


AMAZING resources

Java for Mobile App Development: A Complete Guide in 2025

Get started with Spring Boot and Kotlin | Kotlin Documentation

How to Build Mobile App with Java : A Step by step guide - letsremotify

The Future Of Java: Top Trends And Technologies

Top 7 Java Frameworks for Mobile Development


← Back to Learning Journey