Question 1

What is a ViewModel in Android?

Accepted Answer

A ViewModel is a Jetpack component that stores and manages UI-related data in a lifecycle-aware way. It survives configuration changes (screen rotation) and allows separating business logic from UI.

Question 2

How do you create a ViewModel instance in an Activity?

Accepted Answer

Use ViewModelProvider to create or retrieve a ViewModel instance. ViewModelProvider(this).get(MyViewModel.class) ensures you get the same instance even after screen rotation.

Question 3

Why should you never pass an Activity or View Context into a ViewModel?

Accepted Answer

The ViewModel survives configuration changes and lives longer than Activities. Keeping an Activity Context reference would cause a memory leak. Use AndroidViewModel with Application Context if needed.

Android MVVM Architecture

What is a ViewModel in Android?

回答

How do you create a ViewModel instance in an Activity?

回答

Why should you never pass an Activity or View Context into a ViewModel?

回答

What is LiveData?

What is the difference between LiveData and MutableLiveData?

その他のAndroid面接トピック

Android Fundamentals

Android UI and Resources

Android Lifecycle

Android Navigation

Android Data Management

Android Networking

Android Testing

Android Gradle

Kotlin Language Essentials for Android

Room Database

Background Work

Jetpack Compose

Permissions and Device Features

Firebase for Android

Advanced Android Networking

Kotlin Collections and Operators

Kotlin Coroutines and Flow

Android Dependency Injection

Android MVI Architecture

Android Clean Architecture

Android Compose Advanced

Android Performance and Monitoring

Android Security and Privacy

Android CI/CD and Release

Android UX and Form Factors

Android Testing Advanced

次の面接に向けてAndroidをマスター