MediaQuery for responsiveness in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is MediaQuery in Flutter?

MediaQuery is a widget that provides information about the size and orientation of the screen or parent widget. It helps make apps responsive by adapting UI to different screen sizes.

beginner

How do you get the screen width using MediaQuery?

You use MediaQuery.of(context).size.width to get the current screen width in logical pixels.

beginner

Why is responsiveness important in mobile apps?

Responsiveness ensures the app looks good and works well on different devices, like phones and tablets, by adjusting layouts and sizes automatically.

intermediate

What does MediaQuery.of(context).orientation return?

It returns the current screen orientation as either Orientation.portrait or Orientation.landscape.

intermediate

How can MediaQuery help with font size adjustments?

You can use MediaQuery.of(context).textScaleFactor to scale text size according to user preferences or screen size, improving readability.

Which Flutter code gets the screen height using MediaQuery?

A MediaQuery.of(context).size.height

B MediaQuery.height(context)

C MediaQuery.screenHeight

D MediaQuery.getHeight()

The correct way is MediaQuery.of(context).size.height. The others are not valid Flutter syntax.

What does MediaQuery.of(context).padding provide?

A The size of the keyboard

B The margin around the app

C The safe area padding like status bar or notch

D The app's background color

MediaQuery.of(context).padding gives the padding needed to avoid system UI like status bars or notches.

How can you check if the device is in landscape mode?

A MediaQuery.of(context).orientation == Orientation.landscape

B MediaQuery.orientation == 'landscape'

C MediaQuery.landscape == true

D MediaQuery.of(context).isLandscape()

You compare MediaQuery.of(context).orientation to Orientation.landscape to check orientation.

Why should you avoid hardcoding sizes in Flutter apps?

A Because hardcoded sizes increase app size

B Because hardcoded sizes don't adapt to different screen sizes

C Because hardcoded sizes improve battery life

D Because hardcoded sizes make the app faster

Hardcoded sizes cause UI to look bad on different devices. Using responsive sizes like MediaQuery helps adapt layouts.

Which property helps scale text size according to user settings?

A MediaQuery.fontSize

B MediaQuery.scaleText

C MediaQuery.textSize

D MediaQuery.of(context).textScaleFactor

MediaQuery.of(context).textScaleFactor reflects the user's preferred text scaling for accessibility.

Explain how MediaQuery helps make a Flutter app responsive.

Think about how the app can adjust layout and text based on device info.

Describe a simple example of using MediaQuery to adjust a widget's width.

Imagine you want a box to be half the screen width.