Flutter Online Test
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Premium questions with real-world problems
The Flutter online test evaluates the candidate's knowledge of key concepts used to build UIs with Flutter.
It is an ideal test for pre-employment screening. A good Flutter developer is able to work with the Flutter framework to build high performance and user-friendly UIs.
The online test requires candidates to answer multiple choice and fill-in-the-blank questions about Flutter.
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Free Sample Questions for Flutter Test
Our sample questions are free for companies to use on a trial plan. See more about our premium questions for paid plans below.
Patient Name
Consider the following code for a PatientNameDisplay widget in a hospital app made with Flutter:
class PatientNameDisplay extends StatefulWidget {
final String patientName;
final bool isAlive;
PatientNameDisplay({this.patientName, this.isAlive});
@override
State<PatientNameDisplay> createState() => _PatientNameDisplayState();
}
class _PatientNameDisplayState extends State<PatientNameDisplay> {
@override
Widget build(BuildContext context) {
return Text(
(widget.patientName ?? "John Doe"),
style: TextStyle(color: widget.isAlive ? Colors.blue : Colors.red),
);
}
}
The PatientNameDisplay widget defined above is used to display a patient's name. It has the following requirements:
- The widget might receive patientName as null in the case of anonymous patients.
- The widget will always receive the patient's status in the isAlive field.
Considering the requirements and the code above, what needs to be done to migrate the code to have sound null safety?
(Select all acceptable answers.)
Popup Ad
You are making a Flutter widget to display a popup ad in your app.
The popup ad has 3 sections - title, main, and footer.
Below is the code of the widget:
Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Expanded(
flex: 2,
child: Container(
margin: EdgeInsets.symmetric(vertical: 5),
width: double.infinity,
child: Center(child: Text("Title content"))),
),
Expanded(
flex: 4,
child: Container(
width: double.infinity,
child: Center(child: Text("Main content"))),
),
Expanded(
flex: 1,
child: Container(
width: double.infinity,
child: Text("Footer content"))
),
]);
What can we conclude about the layout of the above widget?
(Select all acceptable answers.)
Voting App
A voting application made with Flutter uses the VoteOnce widget, which allows the user to trigger the onTapCallback function only once no matter how many times it's tapped.
The code for VoteOnce widget is given below:
class VoteOnce extends StatefulWidget {
final Function onTapCallback;
final String tapText;
const VoteOnce({Key? key, required this.onTapCallback, required this.tapText}): super(key: key);
@override
_VoteOnceState createState() => _VoteOnceState();
}
class _VoteOnceState extends State<VoteOnce> {
bool _wasTapped = false;
String _displayText = "";
@override
void initState() {
super.initState();
_displayText = widget.tapText;
}
@override
Widget build(BuildContext context) {
return Container(
child: GestureDetector(
onTap: () {
if (!_wasTapped) {
widget.onTapCallback();
}
setState(() {
_wasTapped = true;
_displayText = "Voted";
});
},
child: Text("Vote for $_displayText"),
),
);
}
}
What can be concluded about the lifecycle of the VoteOnce widget?
(Select all acceptable answers.)
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Premium Questions for Flutter Test
TestDome offers a premium questions library with 1000+ unique, hand-crafted questions whose answers can’t be found online. If you spot an answer somewhere online, we’ll give you a refund.
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Product Details, Social Media Data, Student Search, Files Screen, Diary AppCovered Skills
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