Text widget and styling in Flutter - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ ui_behavior

intermediate

Text widget color and font size

What will be the color and font size of the text displayed by this Flutter code?

Flutter

Text('Hello Flutter', style: TextStyle(color: Colors.red, fontSize: 24))

A Text is black with font size 24

B Text is red with default font size

C Text is red with font size 24

D Text is black with default font size

💡 Hint

Look at the TextStyle properties inside the Text widget.

The Text widget uses the TextStyle with color red and fontSize 24, so the text appears red and sized 24.

📝 Syntax

intermediate

Correct syntax for bold and italic text

Which option correctly styles the text to be bold and italic in Flutter?

A Text('Bold Italic', style: TextStyle(fontWeight: FontWeight.bold, fontStyle: FontStyle.italic))

B Text('Bold Italic', style: TextStyle(weight: FontWeight.bold, style: FontStyle.italic))

C Text('Bold Italic', style: TextStyle(fontWeight: 'bold', fontStyle: 'italic'))

D Text('Bold Italic', style: TextStyle(fontWeight: FontWeight.bold, fontStyle: 'italic'))

💡 Hint

Check the correct property names and value types for fontWeight and fontStyle.

fontWeight and fontStyle require enum values, not strings or wrong property names.

❓ ui_behavior

advanced

Text overflow behavior

What happens when this Flutter Text widget is displayed in a narrow container?

Flutter

Container(width: 100, child: Text('This is a very long text that might overflow', overflow: TextOverflow.ellipsis))

A Text is cut off with an ellipsis (...) at the end

B Text wraps to the next line

C Text overflows and causes a runtime error

D Text is fully shown ignoring the container width

💡 Hint

Look at the overflow property used in the Text widget.

TextOverflow.ellipsis cuts off overflowing text and shows ... at the end.

❓ lifecycle

advanced

Text widget rebuild on state change

If a Text widget's style depends on a state variable, what happens when the state changes and setState() is called?

Flutter

class MyWidget extends StatefulWidget {
  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool isRed = true;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () => setState(() => isRed = !isRed),
      child: Text('Tap me', style: TextStyle(color: isRed ? Colors.red : Colors.blue)),
    );
  }
}

A Text color changes but only after hot reload

B Text color never changes after first build

C App crashes due to infinite rebuild loop

D Text color toggles between red and blue on each tap

💡 Hint

setState triggers rebuild and updates UI with new state values.

Calling setState causes build to rerun, updating the Text color based on the new isRed value.

🔧 Debug

expert

Why does this Text widget not show styled text?

This Flutter code tries to style text with underline and color, but the text appears normal. What is the cause?

Flutter

Text('Styled Text', style: TextStyle(decoration: TextDecoration.underline, color: Colors.green))

A Text widget ignores style property by default

B The decoration value should be TextDecoration.underline, not underline

C Colors.green is not a valid color constant

D TextStyle does not support decoration property

💡 Hint

Check how to specify underline decoration in TextStyle.

The decoration property requires the enum TextDecoration.underline, not a bare word 'underline'.

Practice

1. What does the Text widget do in Flutter?

easy

A. Manages app navigation between screens

B. Creates buttons for user interaction

C. Draws shapes like circles and rectangles

D. Displays words or sentences on the screen

Solution

1. Step 1: Understand the purpose of the Text widget

   The Text widget is designed to show text content on the screen in Flutter apps.

2. Step 2: Compare with other widget functions

   Buttons handle taps, shapes draw graphics, and navigation manages screens, which are not the Text widget's job.

3. Final Answer:

   Displays words or sentences on the screen -> Option D

4. Quick Check:

   Text widget = display text [OK]

Hint: Text widget always shows text on screen [OK]

Common Mistakes:

• Confusing Text with Button widget
• Thinking Text draws shapes
• Mixing Text with navigation widgets

2. Which of these is the correct way to set the text color to red in a Text widget?

easy

A. Text('Hello', style: TextColor(red))

B. Text('Hello', style: TextStyle(color: Colors.red))

C. Text('Hello', color: Colors.red)

D. Text('Hello', style: ColorText(Colors.red))

Solution

1. Step 1: Recall how to style text color in Flutter

   Text color is set inside the style property using TextStyle with the color parameter.

2. Step 2: Check each option's syntax

   Text('Hello', style: TextStyle(color: Colors.red)) uses TextStyle(color: Colors.red) correctly; others use invalid or nonexistent syntax.

3. Final Answer:

   Text('Hello', style: TextStyle(color: Colors.red)) -> Option B

4. Quick Check:

   Text color set via style: TextStyle(color: ...) [OK]

Hint: Use style: TextStyle(color: ...) to set text color [OK]

Common Mistakes:

• Trying to set color directly on Text widget
• Using wrong class names like TextColor
• Missing the style property

3. What will be the visible output of this Flutter code?

Text(
  'Hello Flutter',
  style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20),
  textAlign: TextAlign.center,
)

medium

A. Text 'Hello Flutter' right aligned, italic, size 20

B. Text 'Hello Flutter' left aligned, normal weight, size 14

C. Text 'Hello Flutter' centered, bold, and size 20

D. Text 'Hello Flutter' centered, normal weight, size 14

Solution

1. Step 1: Analyze the style properties

   The fontWeight is set to bold and fontSize to 20, so text will be bold and large.

2. Step 2: Check the textAlign property

   textAlign is TextAlign.center, so the text will be centered horizontally.

3. Final Answer:

   Text 'Hello Flutter' centered, bold, and size 20 -> Option C

4. Quick Check:

   Style and alignment match Text 'Hello Flutter' centered, bold, and size 20 [OK]

Hint: Check style and textAlign for appearance clues [OK]

Common Mistakes:

• Ignoring textAlign property
• Assuming default font size 14 without checking
• Confusing fontWeight with fontStyle

4. Identify the error in this Flutter code snippet:

Text(
  'Welcome',
  style: TextStyle(fontSize: '20'),
)

medium

A. fontSize should be a double, not a string

B. Text widget cannot have style property

C. Missing comma after 'Welcome'

D. TextStyle cannot be used inside Text

Solution

1. Step 1: Check the fontSize value type

   fontSize expects a number (double), but '20' is a string, causing a type error.

2. Step 2: Validate other syntax parts

   Text widget supports style, commas are correct, and TextStyle is valid inside Text.

3. Final Answer:

   fontSize should be a double, not a string -> Option A

4. Quick Check:

   fontSize type error = fontSize should be a double, not a string [OK]

Hint: fontSize must be a number, not quoted text [OK]

Common Mistakes:

• Putting fontSize in quotes
• Thinking style is invalid in Text
• Missing commas causing syntax errors

5. You want to display a long text that might not fit in one line and should show an ellipsis (...) at the end if it overflows. Which Text widget code correctly achieves this?

hard

A. Text('Long text here', overflow: TextOverflow.ellipsis, maxLines: 1)

B. Text('Long text here', maxLines: 1, overflow: TextOverflow.clip)

C. Text('Long text here', overflow: TextOverflow.fade, maxLines: 2)

D. Text('Long text here', maxLines: null, overflow: TextOverflow.ellipsis)

Solution

1. Step 1: Understand overflow and maxLines usage

   To show ellipsis when text is too long, overflow must be TextOverflow.ellipsis and maxLines set to 1 to limit lines.

2. Step 2: Evaluate each option

   Text('Long text here', overflow: TextOverflow.ellipsis, maxLines: 1) correctly uses overflow: TextOverflow.ellipsis and maxLines: 1. Others either use wrong overflow or maxLines values.

3. Final Answer:

   Text('Long text here', overflow: TextOverflow.ellipsis, maxLines: 1) -> Option A

4. Quick Check:

   Ellipsis + maxLines 1 = Text('Long text here', overflow: TextOverflow.ellipsis, maxLines: 1) [OK]

Hint: Use overflow: ellipsis with maxLines: 1 for trailing dots [OK]

Common Mistakes:

• Using overflow: clip instead of ellipsis
• Not setting maxLines to limit lines
• Setting maxLines to null disables line limit