Скачать или смотреть How to Get a Question by Its Category in Kotlin

Learn how to efficiently retrieve quiz questions based on category selection in your Android app using Kotlin. A step-by-step guide for seamless integration!
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How to Get a Question by Its Category in Kotlin

Are you building an Android quiz application and want to display questions based on selected categories? This is a common requirement when creating interactive apps, but the solution can sometimes feel a bit tricky if you're not sure where to start. In this guide, we’ll explore how to implement a feature in your Android app where selected questions appear in a new activity based on the chosen category.

Problem Overview

In your app, you have two activities:

CategoryActivity - where users can select a category

QuizQuestionActivity - where the respective questions for the selected category are displayed.

The challenge is figuring out how to pass the selected category from the CategoryActivity to the QuizQuestionActivity and then fetching the relevant questions. Let’s walk through this step-by-step.

Solution Breakdown

Step 1: Modify Category OnClick Listener

When a user selects a category, you want to pass the category's ID to the QuizQuestionActivity. Instead of sending the category name, we'll send the category ID. To do this, update your onItemClick method in the CategoryActivity as follows:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Changes

Toast Message: This gives feedback to the user, confirming their selection.

Intent Update: The Intent now includes the key "CATEGORY_ID" to pass the ID of the selected category.

Step 2: Retrieve Category ID in QuizQuestionActivity

Next, in the QuizQuestionActivity, you need to retrieve this category ID to fetch the corresponding questions. Here’s how to do it:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Changes

Getting the Passed ID: Use the intent.extras to fetch the category ID sent from the CategoryActivity.

Filtering Questions: The code uses the filter method to create a list containing only the questions that belong to the selected category, thus ensuring that the user sees only the relevant questions.

Conclusion

You've now implemented a feature that allows users to select a category and receive relevant questions based on that selection. By passing the category ID instead of the name, you ensure that the data handling remains efficient and that the correct questions are displayed. This approach not only keeps your code clean but also enhances the user experience by providing targeted content.

Feel free to modify your question model and constants as you see fit, and make sure to test your implementation thoroughly. Happy coding!