Dart Programming Fundamentals

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Questions and Answers

What happens to the future when an asynchronous operation performed by a function fails?

It is cancelled

It is completed successfully

It is completed with an error (correct)

It is paused

Where can the await keyword be used?

In any function

In UI widgets

Only in async functions (correct)

Only in synchronous functions

What triggers the redraw of the UI when using setState()?

Updating a database

Changing a variable

Restarting the app

Setting properties of the state object (correct)

What is the relationship between the UI and the state of an application in Flutter?

UI = f(state) Signup and view all the answers

Which type of state is also called a shared state?

App State Signup and view all the answers

What is the purpose of State Management in the lifecycle of an application?

To manage the state of the app Signup and view all the answers

What is the primary purpose of using the SharedPreferences API?

To save and retrieve persistent key-value pairs of primitive data Signup and view all the answers

What plugin is used to store key-value data on disk?

SQLite plugin Signup and view all the answers

What is the limitation of using the SharedPreferences plugin?

It can only save primitive types Signup and view all the answers

What is the purpose of using the PathProvider plugin?

To access the device's file system Signup and view all the answers

What is the primary purpose of using the HTTP package in Flutter?

To enable networking in Flutter Signup and view all the answers

What is the process of converting an object to a string called?

Serialization Signup and view all the answers

What is the primary purpose of the WorkManager plugin in Dart?

To facilitate persistent background processing Signup and view all the answers

What is the main difference between internal storage and shared storage in Android?

Internal storage is used for app-specific data, while shared storage is used for data shared with other apps Signup and view all the answers

What is the purpose of an isolate in Dart's multithreading model?

To create a separate thread that doesn't share memory with the main program Signup and view all the answers

Which region dominated the mobile market and accounted for over 32.0% of the revenue share in 2023?

Asia Pacific Signup and view all the answers

What happens to files stored in internal storage when the app is uninstalled?

They are removed Signup and view all the answers

What is a factor that drives the mobile application market?

Increase in Internet penetration Signup and view all the answers

What is data persistence in the context of Android app development?

The ability to have data available regardless of changes to the app's state Signup and view all the answers

What is an example of Mobile Analytics?

Funnel Analysis Signup and view all the answers

What is a type of Mobile Analytics?

Mobile Advertising Signup and view all the answers

What is the purpose of the MediaStoreAPI in Android?

To access and manage shared files such as media and documents Signup and view all the answers

What is a Key Mobile Metric?

Mobile Downloads Signup and view all the answers

What is a future trend in Mobile Application Development?

5G - always striving for better, faster connection Signup and view all the answers

What is the purpose of Integration Testing?

To simulate or mock the real environment to find bugs early Signup and view all the answers

What is Test-Driven Development (TDD) approach?

Writing tests before writing the actual code Signup and view all the answers

What is the purpose of a Keystore?

To verify the ownership of an application by providing a digital signature Signup and view all the answers

What is the command to generate a Keystore?

keytool -genkey -v -keystore %userprofile%\upload-keystore.jks -storetype JKS -keyalg RSA -keysize 2048 -validity 10000 -alias upload Signup and view all the answers

What is an Android Application Bundle (AAB)?

A publishing format that includes all the app’s compiled code and resources Signup and view all the answers

What is the purpose of the `flutter build appbundle` command?

To build an Android App Bundle (AAB) Signup and view all the answers

Study Notes

Asynchronous Programming

Future or Future is completed with an error if an asynchronous operation performed by the function fails.
To define an async function, add async before the function body.
Await keyword works only in async functions.
Handling errors can be done using try-catch.

State Management

State is information that can be read when the widget is built and changed over the lifetime of the app.
setState() allows us to set the properties of the state object that triggers the redraw of the UI.
The state of an app is everything that exists in memory when the app is running, including app’s assets, variables, UI, animation state, textures, and fonts.
State management is the most popular and necessary process in the lifecycle of an application.
Flutter is declarative, it builds its user interface to reflect the current state of your application.
UI = f(state)

Types of Conceptual States

Ephemeral State: also called the UI state or local state, contained in a single widget, no need to use state management techniques.
App State: shared state, used to share across many parts of the app, can be stored in Preferences, Files, or Databases.

Data Persistence in Flutter

Using SQLite: store structure data in a private database, uses SQL statements.
Read and Write files: use the pathprovider to access commonly used locations on the device’s file system.
Store key-value data: use the sharepreferences plugin, limitations include only saving primitive types.

Flutter Networking

Use the HTTP package to make HTTP requests.
In the Android Manifest, include permission for INTERNET.

JSON and Serialization

Serialization: converting an object to a string.
Deserialization: converting a string to an object.
Manual serialization: coding it manually.
Code generation libraries: used for serialization.

Background Process

Implementing Dart code, even though the app is not currently an active app.
Examples: Notifications, Sensors.
Isolates: Dart’s model for multithreading, used by creating callbacks and callback dispatchers.
WorkManager Plugin: enables persistent background processing that keeps tasks scheduled through app restarts and system reboots.

Data Persistence and Networking

Data Persistence: the capability to have data that the app uses or relies on to continue to be available regardless of changes to the app’s state.
Different types of persistent data in Android: App-specific storage, Shared storage, Preferences, Databases, Network Connection.

Mobile Analytics

Measuring and analyzing data generated by mobile platforms and properties.
Examples: Advertising KPIs, Funnel Analysis, App performance and usage, Heatmaps, Retention rates, Click-through rates, Conversion rates, Response rates to push notifications and marketing campaigns.
Types of Mobile Analytics: Mobile Advertising, App monetization, Performance analysis, In-app engagement, Mobile analytics for product teams, Mobile analytics for marketing teams, Mobile analytics for UI/UX teams, Mobile analytics for technical teams.

Key Mobile Metrics

Mobile Downloads
Uninstalls
Heatmaps and user session recreations
Session length and depth
Retention Rate
Churn Rate
Sessions
Session Intervals

Future of Mobile Application Development

5G: always striving for better, faster connection
AR and VR: moving beyond gaming
AI: everywhere
Blockchain: beyond cryptocurrency
Wearables: more sophisticated
Security

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Description

This quiz covers the basics of Dart programming, including asynchronous operations, error handling, and state management in Flutter apps.