SurveyKit: Create beautiful surveys with Flutter (inspired by iOS ResearchKit Surveys)

Do you want to display a questionnaire to get the opinion of your users? A survey for a medical trial? A series of instructions in a manual-like style? SurveyKit is an Flutter library that allows you to create exactly that.

Thematically it is built to provide a feeling of a professional research survey. The library aims to be visually clean, lean and easily configurable. We aim to keep the functionality close to iOS ResearchKit Surveys. We also created a SurveyKit version for native Android developers, check it out here

This is an early version and work in progress. Do not hesitate to give feedback, ideas or improvements via an issue.

Examples

Flow

Screenshots

What SurveyKit does for you

  • Simplifies the creation of surveys
  • Provides rich animations and transitions out of the box (custom animations planned)
  • Build with a consistent, lean, simple style, to fit research purposes
  • Survey navigation can be linear or based on a decision tree (directed graph)
  • Gathers results and provides them in a convinient manner to the developer for further use
  • Gives you complete freedom on creating your own questions
  • Allows you to customize the style
  • Provides an API and structure that is very similar to iOS ResearchKit Surveys

What SurveyKit does not (yet) do for you

As stated before, this is an early version and a work in progress. We aim to extend this library until it matches the functionality of the iOS ResearchKit Surveys.

? Setup

To use this plugin, add flutter_surveykit as a dependency in your pubspec.yaml file.

1. Add the dependecy

pubspec.yaml

dependencies:
  surveykit: ^0.1

2. Install it

flutter pub get

3. Import it

import 'package:survey_kit/survey_kit.dart';

? Usage

Example

A working example project can be found HERE

Create survey steps

To create a step, create an instance of one of these 3 classes:

InstructionStep

InstructionStep(
    title: 'Your journey starts here',
    text: 'Have fun with a quick survey',
    buttonText: 'Start survey',
);

The title is the general title of the Survey you want to conduct. The text is, in this case, the introduction text which should give an introduction, about what the survey is about. The buttonText specifies the text of the button, which will start the survey. All of these properties have to be resource Ids.

CompletionStep

CompletionStep(
    title: 'You are done',
    text: 'You have finished !!!',
    buttonText: 'Submit survey',
);

The title is the general title of the Survey you want to conduct, same as for the InstructionStep. The text is here should be something motivational: that the survey has been completed successfully. The buttonText specifies the text of the button, which will end the survey. All of these properties have to be resource Ids.

QuestionStep

QuestionStep(
    title: 'Sample title',
    text: 'Sample text',
    answerFormat: TextAnswerFormat(
        maxLines: 5,
    ),
);

The title same as for the InstructionStep and CompletionStep. The text the actual question you want to ask. Depending on the answer type of this, you should set the next property. The answerFormat specifies the type of question (the type of answer to the question) you want to ask. Currently there these types supported:

  • TextAnswerFormat
  • IntegerAnswerFormat
  • ScaleAnswerFormat
  • SingleChoiceAnswerFormat
  • MultipleChoiceAnswerFormat
  • BooleanAnswerFormat

All that’s left is to collect your steps in a list or add them inline in the widget.

var steps = [step1, step2, step3, ...]

Create a Task

Next you need a task. Each survey has exactly one task. A Task is used to define how the user should navigate through your steps.

OrderedTask

var task = OrderedTask(steps: steps)

The OrderedTask just presents the questions in order, as they are given.

NavigableOrderedTask

var task = NavigableOrderedTask(steps: steps)

The NavigableOrderedTask allows you to specify navigation rules. There are two types of navigation rules:

With the DirectStepNavigationRule you say that after this step, another specified step should follow.

task.addNavigationRule(
  forTriggerStepIdentifier: steps[4].id,
  navigationRule: DirectStepNavigationRule(
      destinationStepStepIdentifier: steps[6].id
  ),
);

With the MultipleDirectionStepNavigationRule you can specify the next step, depending on the answer of the step.

task.addNavigationRule(
  forTriggerStepIdentifier: task.steps[6].id,
  navigationRule: ConditionalNavigationRule(
    resultToStepIdentifierMapper: (input) {
      switch (input) {
        case "Yes":
          return task.steps[0].id;
        case "No":
          return task.steps[7].id;
        default:
          return null;
      }
    },
  ),
);

Evaluate the results

When the survey is finished, you get a callback. No matter of the FinishReason, you always get all results gathered until now. The SurveyResult contains a list of StepResults and the FinishReason. The StepResult contains a list of QuestionResults.

 SurveyKit(
    onResult: (SurveyResult result) {
      //Read finish reason from result (result.finishReason)
      //and evaluate the results
    },
)

Style

There are already many adaptive elements for Android and IOS implemented. In the future development other parts will be adapted too. The styling can be adjusted by the build in Flutter theme.

textTheme Used in
headline2 Title of question
headline5 Text of question
bodyText2 Text of ListTiles
subtitle1 Textstyle used in TextFields

Localization

If you want to override the fixed texts or adapt them to different languages like close, next, …. You need to provide SurveyKit a Map of translations

SurveyKit(
    localizations: {
        'cancel': 'Cancel',
    }
);

Here is a complete list of keys that can be overriden:

key value
cancel cancel
next next

Start the survey

All that’s left is to insert the survey in the widget tree and enjoy.??

Scaffold(
    body: SurveyKit(
         onResult: (SurveyResult result) {
            //Evaluate results
          },
          task: OrderedTask(),
          theme: CustomThemeData(),
    )
);

? Custom steps

At some point, you might wanna define your own custom question steps. That could, for example, be a question which prompts the user to pick color values or even sound samples. These are not implemented yet but you can easily create them yourself:

You’ll need a CustomResult and a CustomStep. The Result class tells SurveyKit which data you want to save.

class CustomResult extends QuestionResult<String> {
    final String customData;
    final String valueIdentifier;
    final Identifier identifier;
    final DateTime startDate;
    final DateTime endDate;
    final String value; //Custom value
}

Next you’ll need a CustomStep class. It is recommended to use the StepView widget as your foundation. It gives you the AppBar and the next button.

class CustomStep extends Step {
  final String title;
  final String text;

  CustomStep({
    @required StepIdentifier id,
    bool isOptional = false,
    String buttonText = 'Next',
    this.title,
    this.text,
  }) : super(isOptional, id, buttonText);

  @override
  Widget createView({@required QuestionResult questionResult}) {
      return StepView(
            step: widget.questionStep,
            result: () => CustomResult(
                id: id,
                startDate: DateTime.now(),
                endDate: DateTime.now(),
                valueIdentifier: 'custom'//Identification for NavigableTask,
                result: 'custom_result',
            ),
            title: Text('Title'),
            child: Container(), //Add your view here
        );
  }
}

If you want to create a complete custom view or just override the navigation behavior you should use the SurveyController with its three methods:

  • onNextStep()
  • onStepBack()
  • onCloseSurvey()

?vs? : Comparison of Flutter SurveyKit, SurveyKit on Android to ResearchKit on iOS

This is an overview of which features iOS ResearchKit Surveys provides and which ones are already supported by SurveyKit on Android. The goal is to make all three libraries match in terms of their functionality.

? : Create your Survey via JSON

You are also able to load and create your survey via JSON. This gives you the oppertunity to dynamicly configure and deliver different surveys. To create your survey in JSON is almost as easy as in Dart. Just call dart Task.fromJson() with your JSON-File or Response. The JSON should look like this:

{
    "id": "123",
    "type": "navigable",
    "rules": [
        {
            "type": "conditional",
            "triggerStepIdentifier": {
                "id": "3"
            },
            "values": {
                "Yes": "2",
                "No": "10"
            }
        },
        {
            "type": "direct",
            "triggerStepIdentifier": {
                "id": "1"
            },
            "destinationStepIdentifier": {
                "id": "3"
            }
        },
        {
            "type": "direct",
            "triggerStepIdentifier": {
                "id": "2"
            },
            "destinationStepIdentifier": {
                "id": "10"
            }
        }
    ],
    "steps": [
        {
            "stepIdentifier": {
                "id": "1"
            },
            "type": "intro",
            "title": "Welcome to the\nQuickBird Studios\nHealth Survey",
            "text": "Get ready for a bunch of super random questions!",
            "buttonText": "Let's go!"
        },
        {
            "stepIdentifier": {
                "id": "2"
            },
            "type": "question",
            "title": "How old are you?",
            "answerFormat": {
                "type": "integer",
                "defaultValue": 25,
                "hint": "Please enter your age"
            }
        },
        {
            "stepIdentifier": {
                "id": "3"
            },
            "type": "question",
            "title": "Medication?",
            "text": "Are you using any medication",
            "answerFormat": {
                "type": "bool",
                "positiveAnswer": "Yes",
                "negativeAnswer": "No",
                "result": "POSITIVE"
            }
        },    
        {
            "stepIdentifier": {
                "id": "10"
            },
            "type": "completion",
            "text": "Thanks for taking the survey, we will contact you soon!",
            "title": "Done!",
            "buttonText": "Submit survey"
        }
    ]
}

You can find the complete example HERE

? Author

This Flutter library is created with ? by QuickBird Studios.

❤️ Contributing

Open an issue if you need help, if you found a bug, or if you want to discuss a feature request.

Open a PR if you want to make changes to SurveyKit.

? License

SurveyKit is released under an MIT license. See License for more information.

GitHub

View Github