Learn API Calling in FlutterFlow with a Quiz App – FlutterFlow Tutorial

Written by: Manish Methani

January 16, 2025 at 5:30pm IST. 3 min 13 sec read

1. • Example Query: https://opentdb.com/api.php?amount=10&category=9&type=boolean

2. Configure the API in FlutterFlow:

   • Navigate to Settings > API Calls.

   • Add a new API call.

   • Use the method: GET.

   • Paste the URL and add optional parameters like amount (number of questions) and category (e.g., General Knowledge).

3. Test the API: Use the built-in testing feature in FlutterFlow to ensure the response contains quiz questions and answers in a boolean format (True/False).

🎨 Step 2: Designing the Quiz App UI

A quiz app needs a simple and engaging user interface. Here’s how to design it:

1. Create a New Page: Name it Quiz Screen.

2. Add Widgets:

   • Text Widget: To display the current question.

   • Button Widgets: For True/False answers.

   • Progress Bar: To show the quiz progress.

3. Bind Widgets to API Data:

   • Bind the Text Widget to the API’s question field.

   • Bind each button to either True or False responses.

🔧 Step 3: Adding Logic for Navigation and Scoring

With the API integrated and the UI designed, let’s add the logic:

1. Track the Current Question: Use a custom App State Variable to track the question index.

2. Handle Button Clicks:

   • Add an action to each answer button to check if the selected answer matches the correct answer (True/False).

   • Update the score variable accordingly.

3. Navigate to the Next Question: Add logic to move to the next question or display the final score when the quiz ends.

🚀 Step 4: Testing the App

Testing is a crucial step. Here’s what to do:

1. Run the App Preview: Check if questions load correctly and answers work as expected.

2. Error Handling: Ensure the app gracefully handles API failures (e.g., no internet).

3. Scoring Validation: Verify that scores are calculated accurately.

🎉 Final Result

By the end of this tutorial, you’ll have a fully functional Quiz App built in FlutterFlow. It dynamically loads questions from the Open Trivia API, navigates through questions, and calculates the final score.

Check out the video tutorial below where I walk you through the entire process step by step. Watch and build along!