Why Navigating between composables in Android Kotlin? - Purpose & Use Cases

The Big Idea

What if switching screens in your app was as easy as clicking a button, without messy code?

The Scenario

Imagine building an app with many screens, like a shopping app where you move from a product list to product details and then to the cart.

Without a clear way to switch screens, you might try to manually hide and show parts of the UI or reload everything from scratch.

The Problem

Manually managing screen changes is slow and confusing.

You have to write lots of code to track which screen is visible, handle back button presses, and pass data between screens.

This often leads to bugs where the wrong screen shows or data gets lost.

The Solution

Using navigation between composables lets you easily move from one screen to another with simple commands.

The system handles showing the right screen, managing back actions, and passing data smoothly.

This makes your app easier to build and less buggy.

Before vs After

✗ Before

if (showProductList) {
  // show product list UI
} else if (showProductDetails) {
  // show product details UI
}

✓ After

navController.navigate("productDetails")

What It Enables

You can build apps with many screens that feel smooth and natural to use, without extra hassle.

Real Life Example

In a travel app, you tap a city on the list and instantly see detailed info about it, then go back to the list with one tap.

Key Takeaways

Manual screen switching is complicated and error-prone.

Navigation between composables simplifies moving between screens.

It improves app flow and user experience effortlessly.