First Flutter app (Hello World) - Build, Publish & Deploy

Build & Publish - First Flutter app (Hello World)

Performance Impact

The "Hello World" Flutter app is very simple and lightweight. It renders a single text widget on the screen, so it easily maintains 60 frames per second (fps) on all devices. Memory usage is minimal, typically under a few megabytes, and battery impact is negligible because the app does not perform any background tasks or animations.

Optimization Tips

Since this app is very basic, it is already optimized for smooth performance. To keep it fast as you add features, avoid rebuilding widgets unnecessarily by using const constructors where possible. Also, keep the widget tree shallow and simple to maintain 60fps rendering.

App Size and Startup Time

The initial Flutter app has a small bundle size, usually around 5-10MB for release builds. Startup time is fast, typically under 1 second on modern devices. To keep size small, remove unused packages and assets, and enable Flutter's tree shaking and code minification in release mode.

iOS vs Android Differences

Flutter apps run the same code on both iOS and Android, so the "Hello World" app looks and behaves identically on both platforms. However, iOS apps require code signing with a valid Apple developer certificate before publishing, while Android apps require signing with a keystore. Also, iOS app review usually takes 1-2 days, whereas Google Play review can be faster.

Store Review Guidelines

• Apple App Store: Ensure your app has a proper app icon and launch screen. The app must not crash and should comply with Apple's Human Interface Guidelines.
• Google Play Store: Provide a privacy policy if your app collects user data. The app must meet content policies and not contain malware.
• Both stores require you to test your app thoroughly and provide accurate metadata and screenshots.

Self-Check Question

Your app takes 5 seconds to load this simple "Hello World" screen. What is likely wrong?

• The app might be running in debug mode instead of release mode, causing slower startup.
• There could be unnecessary heavy initialization code blocking the main thread.
• The device might be low on resources or have slow storage.

Key Result

The basic Flutter "Hello World" app is lightweight and fast, with minimal memory and battery use. To maintain smooth 60fps performance and quick startup, use const widgets and release mode builds. iOS and Android require different signing steps before publishing, and both stores have guidelines to follow for app approval.