Why navigation manages screen transitions in Flutter - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to navigate to a new screen using Navigator.

Flutter

Navigator.of(context).[1](MaterialPageRoute(builder: (context) => NewScreen()));

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

Apush

Bpop

Cremove

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop instead of push removes the current screen instead of adding a new one.

Using remove or replace are not standard Navigator methods for adding screens.

The push method adds a new screen on top of the current one, showing the new screen.

2fill in blank

medium

Complete the code to return to the previous screen.

Flutter

Navigator.of(context).[1]();

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

Apush

BpushReplacement

Cpop

DpopUntil

Attempts:

3 left

💡 Hint

Common Mistakes

Using push adds a new screen instead of going back.

Using pushReplacement replaces the current screen but does not go back.

The pop method removes the current screen and returns to the previous one.

3fill in blank

hard

Fix the error in the code to navigate and replace the current screen.

Flutter

Navigator.of(context).[1](MaterialPageRoute(builder: (context) => HomeScreen()));

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

Apush

BpushReplacement

CpopAndPushNamed

Dpop

Attempts:

3 left

💡 Hint

Common Mistakes

Using push adds a new screen without removing the old one.

Using pop removes the current screen but does not add a new one.

pushReplacement replaces the current screen with a new one, which is useful to avoid stacking screens.

4fill in blank

hard

Fill both blanks to navigate back until a specific screen is reached.

Flutter

Navigator.of(context).[1]((route) => route.[2].name == '/home');

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

ApopUntil

BisFirst

Csettings

DisCurrent

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop removes only one screen.

Using isFirst or isCurrent are boolean checks, not properties.

popUntil pops screens until the condition is met. The settings property holds route info like the name.

5fill in blank

hard

Fill all three blanks to create a named route navigation with arguments.

Flutter

Navigator.of(context).[1]('[2]', arguments: [3]);

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

ApushNamed

B/details

C{'id': 42}

Dpop

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop instead of pushNamed does not navigate forward.

Passing arguments incorrectly causes runtime errors.

pushNamed navigates using a route name. The route name is /details. Arguments can be passed as a map like {'id': 42}.

Practice

1.

What is the main role of navigation in a Flutter app?

easy

A. To style the app's buttons and text

B. To manage moving between different screens or pages

C. To handle data storage locally

D. To connect the app to the internet

Solution

1. Step 1: Understand navigation purpose

   Navigation is used to move users between different screens or pages in an app.

2. Step 2: Compare options

   Only To manage moving between different screens or pages describes managing screen transitions, others describe unrelated tasks.

3. Final Answer:

   To manage moving between different screens or pages -> Option B

4. Quick Check:

   Navigation = screen transitions [OK]

Hint: Navigation means moving between screens [OK]

Common Mistakes:

• Confusing navigation with styling
• Thinking navigation handles data
• Mixing navigation with internet connection

2.

Which Flutter code correctly opens a new screen called SecondPage?

Navigator.???(context, MaterialPageRoute(builder: (context) => SecondPage()));

easy

A. pop

B. remove

C. replace

D. push

Solution

1. Step 1: Identify method to open new screen

   Navigator.push is used to add a new screen on top of the stack.

2. Step 2: Check other options

   pop removes a screen, remove and replace are not standard Navigator methods for opening screens.

3. Final Answer:

   push -> Option D

4. Quick Check:

   Open new screen = Navigator.push [OK]

Hint: Use push to open new screen [OK]

Common Mistakes:

• Using pop to open screen
• Confusing remove with push
• Trying replace which is not standard

3.

What happens when this Flutter code runs?

Navigator.push(context, MaterialPageRoute(builder: (context) => SecondPage()));
Navigator.pop(context);

medium

A. The app opens SecondPage and then immediately returns to the previous screen

B. The app crashes because pop is called without a screen

C. The app stays on the current screen without change

D. The app opens SecondPage and stays there

Solution

1. Step 1: Analyze Navigator.push

   This adds SecondPage on top of the current screen stack, showing it.

2. Step 2: Analyze Navigator.pop

   This removes the top screen (SecondPage), returning to the previous screen.

3. Final Answer:

   The app opens SecondPage and then immediately returns to the previous screen -> Option A

4. Quick Check:

   push then pop = open then close screen [OK]

Hint: push adds screen, pop removes top screen [OK]

Common Mistakes:

• Thinking pop crashes app
• Assuming pop does nothing
• Believing app stays on SecondPage

4.

Identify the error in this Flutter navigation code:

Navigator.pop();

medium

A. Missing context parameter in pop method

B. pop cannot be used to go back

C. pop requires a screen widget as argument

D. pop should be replaced with push

Solution

1. Step 1: Check Navigator.pop syntax

   Navigator.pop requires the BuildContext as the first argument to know which navigation stack to pop from.

2. Step 2: Review other options

   pop is used to go back, does not require a screen widget, and should not be replaced with push here.

3. Final Answer:

   Missing context parameter in pop method -> Option A

4. Quick Check:

   pop(context) needs context [OK]

Hint: Always pass context to Navigator methods [OK]

Common Mistakes:

• Omitting context in pop
• Thinking pop needs a widget
• Replacing pop with push incorrectly

5.

You want to open a new screen and then return data back to the previous screen when closing it. Which Flutter navigation method should you use?

hard

A. Navigator.pushReplacement to open and Navigator.pop without data

B. Navigator.pop to open and Navigator.push to return data

C. Navigator.push to open and Navigator.pop with data to return

D. Navigator.remove to open and Navigator.push to return data

Solution

1. Step 1: Understand opening with data return

   Navigator.push opens a new screen and can await returned data when that screen closes.

2. Step 2: Returning data on close

   Navigator.pop can send data back to the previous screen when popping.

3. Step 3: Check other options

   pop cannot open screens, pushReplacement replaces screen without returning data, remove is not for opening screens.

4. Final Answer:

   Navigator.push to open and Navigator.pop with data to return -> Option C

5. Quick Check:

   push opens, pop returns data [OK]

Hint: Use push to open, pop to return data [OK]

Common Mistakes:

• Using pop to open screen
• Ignoring data return with pop
• Confusing pushReplacement with push