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Learn the correct method to set text in `EditText` in your Kotlin Android app without crashing. Explore a simple fix for your `ResourceNotFoundException`.
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This video is based on the question https://stackoverflow.com/q/65739387/ asked by the user 'NiceToMytyuk' ( https://stackoverflow.com/u/9945307/ ) and on the answer https://stackoverflow.com/a/65739713/ provided by the user 'rahat' ( https://stackoverflow.com/u/9701793/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Set Text in EditText within a Fragment in Kotlin

If you're diving into Android development using Kotlin, you may encounter various issues while manipulating UI elements. One common problem developers face is trying to set text in an EditText inside a fragment - which can cause runtime crashes. This guide will guide you through understanding the issue and provide an effective solution.

The Scenario

Imagine you're developing a simple plus/minus controller in an Android app. The layout contains two buttons (Plus and Minus) alongside an EditText. However, when you try to set text in the EditText upon button clicks, your app crashes with a ResourceNotFoundException. So, why exactly does this happen?

The Root Cause

In Kotlin, when you use the .setText() method on an EditText, you need to be careful about the type of value you are passing. The method can take various types of parameters, including an integer resource ID for a string (using the @ StringRes annotation). Here's the mistake you're making:

What's Happening:

You're passing an int directly to the setText() method.

The method interprets this int as a resource ID for a string, but since your value is not a valid resource, it leads to a crash.

The Solution

The fix is straightforward: instead of passing an integer, convert it to a String before calling setText(). Let’s see how to do this effectively.

Option 1: Simple Conversion

Use the .toString() method to convert your integer value to a String:

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

Option 2: String Interpolation

Alternatively, you can use Kotlin's string interpolation feature:

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

Both methods are valid, so you can choose the one that suits your coding style best.

Final Implementation

With the solution clear, here's how your changeQta function should look with the appropriate fix applied:

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

Conclusion

Understanding how to correctly use the .setText() method is essential for any Android developer working with Kotlin. By ensuring that you're passing a string rather than an integer resource ID to setText(), you can avoid crashes and create a smoother user experience.

Next time you work with EditText in a fragment, remember the tips from this guide to make your coding journey much easier!