These three functions are related to managing coroutines within the context of Android's Lifecycle library. Let's break down each one and understand their differences:

1. viewLifecycleOwner.lifecycleScope.launch: This function launches a coroutine within the scope of a specific LifecycleOwner, typically associated with a Fragment's view. It's commonly used in Android development to perform asynchronous tasks related to the UI lifecycle, such as fetching data or updating UI components. The coroutine is automatically canceled when the associated LifecycleOwner's lifecycle is destroyed, preventing memory leaks.

2. lifecycle.coroutineScope.launch: This function launches a coroutine within the scope of a Lifecycle object. Unlike viewLifecycleOwner.lifecycleScope, which is tied to a Fragment's view lifecycle, this scope is associated with any Lifecycle object, such as an Activity or Fragment lifecycle. It allows you to perform asynchronous tasks that are not directly tied to the UI, but still need lifecycle-aware behavior.

3. lifecycle.coroutineScope.launchWhenCreated: This function launches a coroutine when the associated Lifecycle is in the "created" state. This is a more specific version of lifecycle.coroutineScope.launch, ensuring that the coroutine only runs when the Lifecycle reaches the created state. This can be useful for tasks that should start early in the lifecycle but don't need to run when the UI is fully visible or interactive.

In summary, these functions provide different levels of lifecycle-awareness for launching coroutines in Android apps. They allow developers to manage asynchronous tasks efficiently while ensuring proper handling of lifecycle events to avoid memory leaks and other issues. The choice between them depends on the specific requirements of the task and the lifecycle context in which it needs to operate.