How to Properly Check for Empty EditText Inputs in Kotlin Android Apps

Learn how to efficiently validate EditText inputs in Android Kotlin by ensuring your code checks for empty fields before processing user data.
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This video is based on the question https://stackoverflow.com/q/75623898/ asked by the user 'ilyamio' ( https://stackoverflow.com/u/21323921/ ) and on the answer https://stackoverflow.com/a/75624067/ provided by the user 'Ivo' ( https://stackoverflow.com/u/1514861/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Check for Empty EditText Inputs in Kotlin Android Apps

When developing Android applications using Kotlin, one common issue you may face is checking whether the user has filled in all required fields before proceeding with operations. For instance, in your case, it seems you're experiencing trouble with verifying if the input fields in your EditText are empty when the user hits a button. This guide will walk you through resolving that issue, ensuring that users receive appropriate feedback if they leave critical fields empty.

Understanding the Problem

You have an EditText field for minimum and maximum values and a button that triggers an action. The goal is to check if these fields are filled in by the user. If they are empty, you want to display a toast message prompting them to enter a value. However, your current implementation incorrectly prioritizes parsing these inputs to integers before checking if they are empty, causing the logic to fail silently.

Analyzing the Current Approach

Your initial code structure is as follows:

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

Here’s what’s wrong:

The program attempts to parse the EditText inputs to integers before checking if they are empty. When the input is empty, Integer.parseInt will throw an exception, leading you to bypass your error-checking logic. Consequently, users do not receive a toast notification as intended.

Step-by-Step Solution

To achieve your goal, follow these steps to properly check whether the EditText inputs are filled in before any processing takes place.

1. Rearrange Your Logic

The solution involves moving the empty-checking logic before you attempt to parse inputs into integers. Here's how you can refactor your code:

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

2. Key Changes Made

Input Validation First: Checked if either minToString or maxToString is empty before proceeding to parse integers.

Early Return: If fields are empty, the function now returns early to prevent any further code execution.

Improved Logging: Added log statements to differentiate between valid and invalid input scenarios.

Conclusion

By rearranging the input validation logic to run before parsing operations, your app can correctly check if users have filled required fields in the EditText. Users will receive timely feedback if they leave fields empty, improving the overall user experience in your Android Kotlin applications.

Now you can confidently implement checks on user inputs, ensuring that the data being processed is valid and complete.

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