Explore essential concepts of building responsive user interfaces in Flutter, including layout widgets, adaptive design strategies, and handling different screen sizes. This quiz helps reinforce key skills to create visually appealing and functional apps across devices.
When designing a layout that needs its children to expand and shrink based on available space, which Flutter widget is most appropriate?
Explanation: The Expanded widget helps its child fill the available space in a flex container, such as Row or Column, making it vital for responsive layouts. Stacked is not a widget; you might be confusing it with Stack, which overlays widgets instead of resizing them. Padded is not a widget; Padding controls internal spacing but does not manage expansion. Iconed is not a valid widget and does not handle layout behavior.
What Flutter class would you use to access the current screen's width and height to make layout decisions?
Explanation: MediaQuery provides information about the size and orientation of the current screen, allowing you to build layouts that adapt to different devices. ViewSize and ScreenInfo are not standard Flutter classes and won't give you this information. LayoutSync also does not exist in Flutter and is not used for layout queries.
To ensure a widget displays differently in portrait and landscape modes, what property should you check?
Explanation: MediaQuery.of(context).orientation provides the current device orientation, enabling responsive changes in the UI. Theme.of(context).brightness relates to light or dark theme, not orientation. context.locale deals with localization and language settings. AppBar.actions is unrelated to device orientation and manages action buttons in the app bar.
Which Flutter widget is commonly used to ensure content avoids overlapping with system UI elements like notches or status bars?
Explanation: SafeArea automatically adds appropriate padding to keep content away from operating system intrusions such as notches, status bars, and rounded corners. ListView is for displaying scrollable lists, Scaffold provides a structure for major visual layout, and Container is a general-purpose widget without adaptive padding features.
What Flutter widget should you use to arrange children in a horizontal or vertical array with flexible sizing options?
Explanation: The Flex widget, along with its common subclasses Row and Column, is designed for arranging children linearly either horizontally or vertically, providing strong flexibility. Shape and WrapContent are not Flutter layout widgets; EdgeInsets represents padding or margin values, not a layout container.
If you want to show or hide a widget based on screen width, what Flutter widget can you use to conditionally display a child widget?
Explanation: Visibility allows you to show, hide, or remove widgets depending on conditions, such as screen width. GridTile is used within grid layouts for displaying tiles, not for conditional display logic. AspectScreen is not a valid Flutter widget, and FadeOut implies an animation rather than a visibility condition.
What should you consider when placing many widgets in a Row so that they fit on smaller screens without causing errors?
Explanation: When a Row's children don't fit, you should make the row scrollable (using SingleChildScrollView) or adapt to a different layout strategy for smaller screens. Increasing elevation or color doesn't solve overflow; these are for styling. Using only Icon widgets may reduce content size but does not address fundamental layout issues.
If you want two widgets to split available horizontal space at a 2:1 ratio in a Row, what should you use?
Explanation: Using Expanded with custom flex values lets you control how much space each child takes relative to others, such as giving one child flex: 2 and the other flex: 1 for a 2:1 split. SingleChildScrollView enables scrolling but not proportional sizing. Setting double width in Container is not a responsive approach. Padding shapes spacing but won't manage flexible division of available space.
What widget helps you ensure that your text automatically scales based on user device accessibility settings?
Explanation: The Text widget in Flutter responds to system text scaling as users adjust accessibility settings, making your UI text more responsive to user needs. AutoText, ScreenText, and TextSize are not predefined widgets in Flutter—choosing these would result in errors. Only Text provides this automatic scaling behavior.
Which layout widget would you use to arrange child widgets in both horizontal and vertical directions, automatically wrapping them to new lines as needed?
Explanation: Wrap arranges its children in multiple horizontal and vertical runs, automatically moving widgets to a new line when space runs out, aiding responsive layouts. Stack overlays widgets, Table arranges widgets strictly in rows and columns, and Positioned is only used within a Stack to place children absolutely rather than wrapping them.