MediaQuery for responsiveness in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the screen width using MediaQuery.

Flutter

double screenWidth = MediaQuery.of(context).[1].width;

Drag options to blanks, or click blank then click option'

AdevicePixelRatio

Borientation

Cpadding

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'orientation' instead of 'size' will not give width.

Using 'padding' or 'devicePixelRatio' does not provide screen dimensions.

The size property of MediaQueryData gives the screen size, including width and height.

2fill in blank

medium

Complete the code to check if the device is in landscape mode using MediaQuery.

Flutter

bool isLandscape = MediaQuery.of(context).orientation == [1].landscape;

Drag options to blanks, or click blank then click option'

AMediaQuery

BOrientation

CScreen

DDeviceOrientation

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'MediaQuery.landscape' is incorrect because 'landscape' is part of Orientation enum.

Using 'DeviceOrientation' is a different enum used for sensors, not MediaQuery.

The Orientation enum has values portrait and landscape to compare with MediaQuery orientation.

3fill in blank

hard

Fix the error in the code to get the height excluding padding (like status bar) using MediaQuery.

Flutter

double height = MediaQuery.of(context).size.height - MediaQuery.of(context).[1].top;

Drag options to blanks, or click blank then click option'

Apadding

BviewPadding

CviewInsets

DpaddingInsets

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'viewPadding' or 'viewInsets' is incorrect for this purpose.

There is no 'paddingInsets' property.

The padding property gives the parts of the screen obscured by system UI like status bar.

4fill in blank

hard

Fill both blanks to create a Container that is half the screen width and a quarter of the screen height.

Flutter

Container(width: MediaQuery.of(context).size.[1] / 2, height: MediaQuery.of(context).size.[2] / 4, color: Colors.blue);

Drag options to blanks, or click blank then click option'

Awidth

Bheight

Corientation

Dpadding

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'orientation' or 'padding' instead of width or height will cause errors or wrong sizes.

The width and height properties of MediaQuery size give screen dimensions to calculate container size.

5fill in blank

hard

Fill all three blanks to create a Text widget that shows screen width, height, and orientation.

Flutter

Text('Width: ${MediaQuery.of(context).size.[1], Height: ${MediaQuery.of(context).size.[2], Orientation: ${MediaQuery.of(context).[3]');

Drag options to blanks, or click blank then click option'

Awidth

Bheight

Corientation

Dpadding

Attempts:

3 left

💡 Hint

Common Mistakes

Using padding instead of orientation will show wrong info.

Mixing up width and height properties.

This code shows screen width and height from size, and orientation from MediaQuery directly.

Practice

1. What does MediaQuery.of(context).size provide in a Flutter app?

easy

A. The list of installed fonts

B. The current theme colors

C. The width and height of the device screen

D. The app's current state

Solution

1. Step 1: Understand MediaQuery size property

   MediaQuery.of(context).size returns the screen's width and height as a Size object.

2. Step 2: Differentiate from other properties

   Theme colors, fonts, and app state are unrelated to MediaQuery size.

3. Final Answer:

   The width and height of the device screen -> Option C

4. Quick Check:

   MediaQuery size = screen dimensions [OK]

Hint: MediaQuery size always means screen width and height [OK]

Common Mistakes:

• Confusing size with theme or app state
• Thinking it returns orientation
• Assuming it gives device model info

2. Which of the following is the correct syntax to get the device orientation using MediaQuery?

easy

A. MediaQuery.orientation(context)

B. MediaQuery.of(context).orientation

C. MediaQuery.getOrientation(context)

D. MediaQuery.context.orientation

Solution

1. Step 1: Recall correct MediaQuery syntax

   The correct way is MediaQuery.of(context).orientation to access orientation.

2. Step 2: Eliminate incorrect options

   Other options use invalid method names or wrong property access.

3. Final Answer:

   MediaQuery.of(context).orientation -> Option B

4. Quick Check:

   Use .of(context) to access MediaQuery properties [OK]

Hint: Always use MediaQuery.of(context) to access properties [OK]

Common Mistakes:

• Omitting .of(context)
• Using wrong method names
• Accessing properties directly on MediaQuery

3. Given this Flutter code snippet:

final size = MediaQuery.of(context).size;
final width = size.width;
final height = size.height;

print('Width: $width, Height: $height');

What will this print if the device screen is 360 pixels wide and 640 pixels tall?

medium

A. Width: 360, Height: 640

B. Width: 0, Height: 0

C. Width: 640, Height: 360

D. Width: null, Height: null

Solution

1. Step 1: Understand MediaQuery size values

   MediaQuery.of(context).size.width gives screen width (360), height gives screen height (640).

2. Step 2: Match printed output

   The print statement outputs width first then height, so it prints "Width: 360, Height: 640".

3. Final Answer:

   Width: 360, Height: 640 -> Option A

4. Quick Check:

   Width = 360, Height = 640 [OK]

Hint: Width is first, height is second in MediaQuery size [OK]

Common Mistakes:

• Swapping width and height values
• Assuming zero or null values
• Confusing print output format

4. This Flutter code tries to get screen width but causes an error:

double width = MediaQuery.size.width;

What is the main problem?

medium

A. MediaQuery.size.width should be MediaQuery.width.size

B. Width should be an int, not double

C. MediaQuery.size needs a BuildContext parameter

D. MediaQuery.size is not a valid property; .of(context) is missing

Solution

1. Step 1: Check MediaQuery usage

   MediaQuery properties require calling .of(context) to access size.

2. Step 2: Identify missing .of(context)

   The code misses .of(context), so MediaQuery.size is invalid.

3. Final Answer:

   MediaQuery.size is not a valid property; .of(context) is missing -> Option D

4. Quick Check:

   Always use MediaQuery.of(context) [OK]

Hint: Always call MediaQuery.of(context) before properties [OK]

Common Mistakes:

• Forgetting .of(context)
• Confusing property order
• Wrong data type assumptions

5. You want to build a widget that shows a different layout depending on device orientation. Which Flutter code snippet correctly uses MediaQuery to check orientation?

hard

A. if (MediaQuery.of(context).orientation == Orientation.portrait) { return PortraitWidget(); } else { return LandscapeWidget(); }

B. if (MediaQuery.orientation(context) == 'portrait') { return PortraitWidget(); } else { return LandscapeWidget(); }

C. if (MediaQuery.of(context).size.width > MediaQuery.of(context).size.height) { return PortraitWidget(); } else { return LandscapeWidget(); }

D. if (MediaQuery.of(context).orientation == 'landscape') { return PortraitWidget(); } else { return LandscapeWidget(); }

Solution

1. Step 1: Use correct orientation check

   MediaQuery.of(context).orientation returns an enum Orientation.portrait or Orientation.landscape.

2. Step 2: Verify correct comparison and widget return

   if (MediaQuery.of(context).orientation == Orientation.portrait) { return PortraitWidget(); } else { return LandscapeWidget(); } compares orientation to Orientation.portrait correctly and returns widgets accordingly.

3. Step 3: Eliminate wrong options

   if (MediaQuery.orientation(context) == 'portrait') { return PortraitWidget(); } else { return LandscapeWidget(); } uses wrong syntax, C compares sizes incorrectly, D reverses widget logic.

4. Final Answer:

   if (MediaQuery.of(context).orientation == Orientation.portrait) { return PortraitWidget(); } else { return LandscapeWidget(); } -> Option A

5. Quick Check:

   Compare orientation enum, not strings or sizes [OK]

Hint: Compare orientation to Orientation.portrait or .landscape [OK]

Common Mistakes:

• Comparing orientation to strings
• Using size to guess orientation
• Reversing widget logic