Synechron Android Interview Questions and Answers

View model in Android is a class that stores and manages UI-related data in a lifecycle-conscious way.

• View model survives configuration changes and is not destroyed when the UI is destroyed.

• It is used to separate the UI controller logic from the UI layout.

• View model is typically used with LiveData to update the UI when the data changes.

• It helps in organizing and handling data for the UI efficiently.

Data class requires at least one parameter in primary constructor to ensure each instance of the class is unique.

• Primary constructor parameters are used to initialize properties in data class.

• Data classes are designed to hold data, so having at least one parameter ensures uniqueness of instances.

• Without parameters, instances of data class would be identical and defeat the purpose of data class.