Question 1

What are the three possible states returned by AppState.currentState in React Native?

Accepted Answer

AppState.currentState returns one of three states: 'active' (app is in the foreground and interactive), 'background' (app is in the background but potentially running) and 'inactive' (transitional state on iOS, for example when displaying the multitasking view). On Android, 'inactive' state is rare as the transition goes directly between 'active' and 'background'.

Question 2

Which method should be used to listen for application state changes with AppState?

Accepted Answer

The AppState.addEventListener('change', callback) method allows listening for application state changes. The callback receives the new state ('active', 'background' or 'inactive') as a parameter. It is important to remove the listener using the remove() method returned by addEventListener during cleanup to avoid memory leaks.

Question 3

When does the 'inactive' state typically occur on iOS?

Accepted Answer

The 'inactive' state on iOS occurs during brief transitions: displaying the control center, notification center, multitasking screen (double tap Home), or during an incoming call. It is an intermediate state where the app is visible but not interactive. On Android, this state is rarely observed as the transition between 'active' and 'background' is direct.

App Lifecycle & Background Execution

What are the three possible states returned by AppState.currentState in React Native?

Câu trả lời

Which method should be used to listen for application state changes with AppState?

Câu trả lời

When does the 'inactive' state typically occur on iOS?

Câu trả lời

How to correctly implement an AppState listener in a useEffect?

What is a Headless JS Task in React Native?

Các chủ đề phỏng vấn React Native khác

JavaScript Essentials

React Fundamentals

React Native Basics

React Hooks

TypeScript for React & React Native

React Native Components & API

React Native Styling & Layout

React Native Navigation

React Native State Management

React Native Networking & API

Data Persistence

Forms & Validation

React Native Animations

Native Modules & Bridge

Platform-Specific Code

Permissions & Device APIs

Push Notifications

React Native Testing

React Native Debugging

Build & Deployment

Expo vs React Native Bare

Performance Optimization

Memory Management

Architecture Patterns

React Native New Architecture

Security Best Practices

Offline-First Architecture

React Native CI/CD

Monorepo & Code Sharing

Advanced Topics

Authentication & Session Management

Monitoring & Crash Reporting

Nắm vững React Native cho lần phỏng vấn tiếp theo