SavedStateHandle in Android Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is SavedStateHandle in Android Kotlin?

SavedStateHandle is a class that helps you save and restore UI-related data in ViewModels during process death or configuration changes, like screen rotations.

beginner

How do you get a SavedStateHandle instance inside a ViewModel?

You receive it as a constructor parameter when you create your ViewModel by extending ViewModel and using SavedStateViewModelFactory or by viewModels() with saved state support.

beginner

How do you save a value using SavedStateHandle?

Use the set(key, value) method. For example, savedStateHandle.set("count", 5) saves the number 5 with the key "count".

beginner

How do you retrieve a saved value from SavedStateHandle?

Use the get<T>(key) method. For example, savedStateHandle.get<Int>("count") returns the saved integer or null if not found.

intermediate

Why is SavedStateHandle better than just using onSaveInstanceState in Activities?

SavedStateHandle works inside ViewModels, keeping UI data separate from UI controllers. It survives process death and configuration changes without cluttering Activity or Fragment code.

What is the main purpose of SavedStateHandle in Android Kotlin?

A To save and restore UI-related data in ViewModels

B To handle network requests

C To manage database connections

D To create UI layouts

SavedStateHandle is designed to save and restore UI-related data inside ViewModels.

How do you typically receive a SavedStateHandle in a ViewModel?

A As a constructor parameter

B By calling a static method

C By accessing a global variable

D By inflating a layout

SavedStateHandle is passed as a constructor parameter to the ViewModel.

Which method saves a value in SavedStateHandle?

A put(key, value)

B set(key, value)

C save(key, value)

D store(key, value)

The correct method to save data is set(key, value).

What happens to data saved in SavedStateHandle when the app process is killed and restarted?

A Data is lost

B Data is sent to the server

C Data is saved to a file

D Data is restored automatically

SavedStateHandle restores data automatically after process death.

Which Android component benefits most from using SavedStateHandle?

A Service

B Activity

C ViewModel

D BroadcastReceiver

SavedStateHandle is designed to be used inside ViewModels.

Explain how SavedStateHandle helps preserve UI state in Android apps.

Think about how your app remembers data after screen rotation or app restart.

Describe the steps to use SavedStateHandle in a ViewModel to save a counter value.

Imagine you want to keep track of a number even if the app restarts.