top of page
  • Writer's pictureRobin Alex Panicker

Decorator Pattern in Jetpack Compose Android Apps

Decorator Pattern in Jetpack Compose Android Apps

Jetpack Compose has revolutionized Android app development by providing a modern and declarative way to build user interfaces. One powerful design pattern that can be effectively utilized in Jetpack Compose apps is the Decorator Pattern. The Decorator Pattern allows you to dynamically add behaviors or functionalities to an object without altering its structure.

In this blog post, we will explore how to leverage the Decorator Pattern in Jetpack Compose to create flexible and extensible UI components.

Understanding the Decorator Pattern

Before we dive into using the Decorator Pattern in Jetpack Compose, let's have a brief overview of what the pattern entails.

The Decorator Pattern is a structural design pattern that allows you to attach additional responsibilities to objects dynamically. It is achieved by creating a set of decorator classes that are used to wrap concrete components. These decorators enhance the functionality of the original component while adhering to the Open-Closed Principle, which states that classes should be open for extension but closed for modification.

Implementing the Decorator Pattern in Jetpack Compose

In the context of Jetpack Compose, the Decorator Pattern can be employed to create reusable and customizable UI components. Let's walk through an example of how to use the Decorator Pattern to enhance a simple Button component in Jetpack Compose.

Step 1: Create the Base Component

We'll start by defining a basic Button component using Jetpack Compose:

fun BaseButton(text: String, onClick: () -> Unit) {
    Button(onClick = onClick) {
        Text(text = text)

Step 2: Create Decorators

Next, we'll create decorator functions that add additional features to the BaseButton. For this example, we'll implement two decorators: one that adds a loading indicator and another that changes the button's color.

fun LoadingDecorator(content: @Composable () -> Unit) {
    // Add loading indicator logic here

fun ColoredDecorator(color: Color, content: @Composable () -> Unit) {
    // Add color modification logic here

Step 3: Apply Decorators

Now, let's apply the decorators to the BaseButton:

fun DecoratedButton(
    text: String,
    onClick: () -> Unit,
    loading: Boolean = false,
    color: Color = Color.Blue
) {
    BaseButton(text = text, onClick = onClick)
    if (loading) {
        LoadingDecorator {
            BaseButton(text = text, onClick = onClick)
    ColoredDecorator(color = color) {
        BaseButton(text = text, onClick = onClick)

Step 4: Using the DecoratedButton

Finally, you can use the DecoratedButton in your UI code:

fun MyScreen() {
        text = "Click me",
        onClick = { /* Handle button click */ },
        loading = true,
        color = Color.Red

In this example, the DecoratedButton combines the functionalities provided by the LoadingDecorator and ColoredDecorator while maintaining the extensibility of the base Button.


The Decorator Pattern is a valuable tool in Jetpack Compose for creating modular and flexible UI components. By following the principles of the pattern, you can enhance existing components with new behaviors without altering their structure. This approach promotes code reusability, maintainability, and adheres to important software design principles.

In this blog post, we explored how to implement the Decorator Pattern in Jetpack Compose by creating a Button component and applying various decorators to it. This is just one example of how you can leverage the Decorator Pattern in your Android app development journey using Jetpack Compose. Experiment with different decorators and components to build powerful and customizable user interfaces that meet your app's requirements.

Happy coding!

Blog for Mobile App Developers, Testers and App Owners


This blog is from Finotes Team. Finotes is a lightweight mobile APM and bug detection tool for iOS and Android apps.

In this blog we talk about iOS and Android app development technologies, languages and frameworks like Java, Kotlin, Swift, Objective-C, Dart and Flutter that are used to build mobile apps. Read articles from Finotes team about good programming and software engineering practices, testing and QA practices, performance issues and bugs, concepts and techniques. 

bottom of page