In Android Jetpack Compose is a modern UI toolkit developed by Google for building Android applications. It simplifies and accelerates the UI development by offering a declarative approach to building user interfaces and we can easily create fast and responsive application with help of jetpack compose.
In this blog, we will explore Top 10 most important Android Jetpack Compose Interview Questions with Example in 2024.
Top 10 Most Important Android Jetpack Compose Interview Questions with Example in 2024
Ques-1: What is Jetpack Compose and Why is it important for Android development?
Ans-1: In Android Development Jetpack Compose is a modern UI toolkit developed by Google for building Android applications. It simplifies and enhance the UI implementation by providing a declarative approach to building user interfaces and we can easily create fast and responsive application with help of jetpack compose.
Jetpack Compose simplifies UI development, reduces boilerplate code of app, and provides a more intuitive way to create responsive UIs.
Ques-2: What are advantages and disadvantages in Jetpack Compose?
Ans-2:
Advantages of Jetpack Compose:
- Declarative UI: Jetpack Compose allows to describe the UI part based on the current state, making the code more maintainable and readable.
- Live Previews: Jetpack Compose provides real-time UI previews in Android, enabling instant changes during application development.
- Simplified State Management: Jetpack Compose simplifies state management, when the state changed its automatically recompose only the affected parts of the UI.
- Enhanced Performance: Jetpack Compose leverages to use Kotlin’s language features and efficient rendering, resulting in improved performance of code compared to the traditional View system.
Disadvantages of Jetpack Compose:
- Learning Curve: Adopting Jetpack Compose may require some challenging and learning for developers. But that is worthwhile due to the increased productivity.
- Limited Documentation: As we know Jetpack Compose is new technology and has gained popularity, the availability of documentation and learning online resources is not as available as XML. But this situation is improving day by day, but now it’s a challenging.
- Compatibility: It is compatible with only Android 5.0 (API level 21) and higher. If you need to use jetpack compose in old Android versions, So you may need to mix Compose and XML code together in your project.
Ques-3: What is Composable Function in Jetpack Compose?
Ans-3: A Composable function is a same Kotlin function annotated with the @Composable annotation. It is the fundamental building block of Jetpack Compose and describes a UI component's behavior and appearance. Composable functions are separate of the activity or fragment lifecycle, making them easily reusable and testable.
- A composable function is a modern way to implementing UI in Android.
- Composable annotation tells the Jetpack Compose compiler that the function is meant for UI implementation.
- Composable functions allow developer to build a UI part with Kotlin code which is more concise and flexible.
- Composable functions can easily manage UI and State development within a single scope function.
Ques-4: What is state management and How to work in Jetpack Compose?
Ans-4: After state change, Jetpack Compose automatically recompose only the affected UI part, ensuring efficient UI updates.
State management in Jetpack Compose revolves around the concept of mutable state or remember function. Jetpack Compose provides the mutableStateOf() or remember function to store and observe the state of objects.
There are two main ways to manage state in Jetpack Compose:
Stateful Composable: Stateful composable that manage their own state. This state is stored within the composable function itself, Jetpack Compose manage there state with the help of some tools, such as remember or mutableStateOf. After the state changes, the composable function automatically recomposes itself, updating the UI part with the new state.
Stateless Composable: Stateless composable do not have their own state. Instead, they depend on the parents class or method state. When the parent class or method state changes, then the stateless composable is recomposed and the new state is used to update the UI.
Ques-5: What is role of Modifier in Jetpack Compose?
Ans-5: The Modifier is used to customize and change the behavior of UI elements in Jetpack Compose. It allows you to provide multiple properties such as size, padding, alignment, background color, and more. Modifiers can be chained together to apply multiple transformations to a single UI element.
@Composable
private fun Greeting(name: String) {
Column(modifier = Modifier.padding(24.dp)) {
Text(text = "Hello,")
Text(text = name)
}
}Ques-6: What is remember function in Jetpack Compose?
Ans-6: The remember function is a utility function used for store or retaining state while recomposition of a composable function. It allows developer to keep track of a previous state within a Composable function without having to manage the state yourself.
The remember function is almost same like mutableStateOf function in that it holds the state, but it also ensures that the state is preserved while recomposition of the Composable function. When the Composable is recomposed, remember function returns the previously preserved state, so the state is retained and not reset to its new value.
Ques-7: What is Recomposition in Jetpack Compose?
Ans-7: Recomposition is the process of automatically updating only the affected parts of the UI, when the state of a Composable function are modified. That means when a state change, only the affected Composable functions are recomposed.
Ques-8: What is side effects in Jetpack Compose?
Ans-8: The use of side effects in Jetpack Compose is to allow for the implementation of non-UI related task that change the state of the app outside of a Composable function in a controlled manner.
Side effects, such as making a network call or updating a database, should be kept separate from the UI rendering logic to improve the maintainability and performance of the code.
Side effects are handled using composable functions like LaunchedEffect or DisposableEffect, which allow you to perform these task while ensuring proper lifecycle management.
Ques-9: How can we handle asynchronous operations in Jetpack Compose?
Ans-9: Asynchronous operations in Jetpack Compose can be handled using coroutines and the suspend function. You can launch coroutines in the LaunchedEffect composable function or other coroutine builders. This allows developer to perform asynchronous task in the main thread and update the UI when the task completes.
Ques-10: What is Launched Effect and Disposable Effect in Jetpack Compose?
Ans-10:
Launched Effect:
LaunchedEffect function is a powerful tool in Jetpack Compose for handling side effects within composable functions. It allows you to run asynchronous operations, handle external data sources and update the UI based on their results, while ensuring lifecycle-aware execution and proper cancellation when the composable is no longer needed.
Disposable Effect:
DisposableEffect function is a powerful tool in Jetpack Compose that allows you to handle side effects in your composable functions that need to be cleaned up when the composable leaves the composition. You can use keys to control when the callback function is called during composition.
Reference Site
here you can learn more about Android Jetpack Compose Interview Questions
Conclusion
In this blog, I have covered all most important Android Jetpack Compose Interview Questions in 2024. You can easily learn and prepare yourself for the interview.