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Android Kotlinmobile~5 mins

rememberSaveable for configuration changes in Android Kotlin - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What is rememberSaveable in Jetpack Compose?

rememberSaveable is a function that helps save and restore state across configuration changes like screen rotations in Android apps using Jetpack Compose.

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beginner
How does rememberSaveable differ from remember?

remember keeps state only during recompositions but loses it on configuration changes. rememberSaveable saves state to a Bundle, so it survives configuration changes like screen rotations.

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intermediate
Which types of data can rememberSaveable automatically save?

It automatically saves types supported by the Android Bundle, such as Int, String, Boolean, and Parcelable objects.

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intermediate
What happens to the state stored with rememberSaveable when the app process is killed?

The state is lost because rememberSaveable saves state only for configuration changes, not for process death or app termination.

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advanced
How can you save a custom data type with rememberSaveable?

You can provide a custom Saver to tell rememberSaveable how to save and restore your custom data type.

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What is the main benefit of using rememberSaveable over remember?
AIt improves app performance by caching data.
BIt preserves state across configuration changes like screen rotations.
CIt automatically saves data to a database.
DIt prevents app crashes.
Which of these types can rememberSaveable save automatically?
AFunctions
BOpen network connections
CThreads
DInt and String
What do you need to provide to save a custom data type with rememberSaveable?
AA custom <code>Saver</code>
BA database schema
CA network API
DNothing, it saves all types automatically
Does rememberSaveable keep state if the app process is killed by the system?
AOnly on Android 12 and above
BYes, always
CNo, it only survives configuration changes
DOnly if the app is in the foreground
Which Jetpack Compose function would you use to save UI state that should survive screen rotations?
ArememberSaveable
BLaunchedEffect
CmutableStateOf
Dremember
Explain how rememberSaveable helps manage state during configuration changes in Jetpack Compose.
Think about what happens when you rotate your phone and how state can be lost or saved.
You got /4 concepts.
    Describe how to save a custom data type using rememberSaveable.
    Consider how Android saves simple types and what you need to do for your own objects.
    You got /3 concepts.