Flutter技术问答：MaterialApp的title属性具体用于何处？

Great question! Let me break down exactly what the title property in MaterialApp is used for in your Flutter project—since it’s easy to mix it up with the AppBar title or the app’s package name display.

Here are the key scenarios where this title comes into play:

• Recent Apps/Task Manager Display
  When users open their device’s recent apps list (by pressing the recent apps button or swiping up on most devices), this title is what shows up to identify your app. It’s a system-level label, completely separate from the text you set in your AppBar.

• Accessibility Support
  Screen readers and other accessibility services use this title to announce your app’s name to visually impaired users. It’s an important part of making your app usable for everyone.

• Default Navigation Route Titles
  If you use Flutter’s navigation system (like Navigator), this title acts as a fallback for routes that don’t have an explicitly set title. Some platform navigation behaviors might rely on this default value.

• Platform-Specific Integrations
  Certain platform features (like iOS app switcher context or Android app shortcuts) may reference this title as part of your app’s metadata, helping the OS interact with your app correctly.

To tie this to your code example:

return new MaterialApp(
  debugShowCheckedModeBanner: false,
  title: 'Rectangle App', // This serves system/accessibility/navigation use cases
  home: Scaffold(
    appBar: AppBar(
      title: Text('Rectangle App Home Page'), // This is the visible title on your home screen's AppBar
    ),
    body: HelloRectangle(),
  ),
);

The AppBar title is purely for on-screen UI in your app’s home page, while the MaterialApp title works behind the scenes for system-level and accessibility needs.

内容的提问来源于stack exchange，提问作者Tushar Rai