What is the difference between Future and Stream in Dart?
- A Future can emit multiple values over time
- A Future represents a single asynchronous operation
- A Stream is always resolved with a single value
- A Stream represents a sequence of asynchronous events
The key difference between Future and Stream in Dart lies in their nature and use cases. A Future represents a single asynchronous operation that will eventually complete with a value or an error. On the other hand, a Stream represents a sequence of asynchronous events that can be processed over time. While a Future is resolved once, a Stream can emit multiple values over time, making it suitable for handling continuous or multiple events.
What is the primary file used to add a new plugin to a Flutter project?
- androidManifest.xml
- main.dart
- package.json
- pubspec.yaml
In a Flutter project, the primary file used to add a new plugin is 'pubspec.yaml.' This file is the configuration file for Dart packages and contains metadata about the project, including dependencies. When adding a new plugin, you specify its version and other details in the 'dependencies' section of 'pubspec.yaml.' Understanding how to manage dependencies in this file is crucial for integrating external packages and extending the functionality of a Flutter app.
What widget is commonly used in Flutter to display an image from the internet?
- Image.asset() widget
- Image.file() widget
- Image.memory() widget
- Image.network() widget
The 'Image.network()' widget is commonly used in Flutter to display an image from the internet. It takes a URL as an argument and loads the image from the specified location. This is useful for fetching images dynamically from the web. Developers often utilize this widget when working with network images, ensuring efficient handling and rendering of images in Flutter applications.
In Flutter, how can you create a layout that changes based on the device orientation?
- Applying conditional statements based on MediaQueryData.orientation
- Defining separate layouts for each orientation
- Using the OrientationBuilder widget
- Utilizing the device_orientation property in the layout builder
The OrientationBuilder widget in Flutter is specifically designed to create layouts that adapt to the device orientation. It rebuilds when the device orientation changes, allowing developers to adjust the UI dynamically. This is a key component for creating responsive designs that provide a seamless user experience across different device orientations.
In a scenario where a Flutter app needs to control IoT devices in a smart home, which architecture would be most efficient?
- Client-Server Architecture
- Event-Driven Architecture
- Microservices Architecture
- Peer-to-Peer Architecture
For a Flutter app controlling IoT devices in a smart home, a Microservices Architecture would be most efficient. Microservices allow for modular development, enabling separate services for different IoT devices. This promotes scalability, flexibility, and easier maintenance. Each microservice can handle the logic for a specific device, facilitating better organization and management in a smart home scenario.
Advanced targeting of push notifications, such as sending based on user behavior, requires integrating with an ________ platform.
- Amazon Simple Notification Service (SNS)
- Firebase Cloud Messaging (FCM)
- OneSignal
- Pusher
Push Notifications