Resolving the Keyboard Closes Issue in Flutter Dialogs

Описание: Learn how to fix the `keyboard closes unexpectedly` problem when interacting with text fields in Flutter dialog boxes. Follow our step-by-step guide for a smooth user experience.
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This video is based on the question https://stackoverflow.com/q/71705421/ asked by the user 'Deepak' ( https://stackoverflow.com/u/15610685/ ) and on the answer https://stackoverflow.com/a/71706778/ provided by the user 'Deval Joshi' ( https://stackoverflow.com/u/12585274/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Keyboard Closes Issue in Flutter Dialogs

When developing applications using Flutter, you may encounter a frustrating issue: the keyboard closes unexpectedly when you try to interact with a text field in a dialog box. This can disrupt the user experience, especially when users are required to input information such as a PAN card number with a specific length constraint. In this guide, we will explore this issue in detail and provide you with a straightforward solution.

Understanding the Problem

In a typical scenario where a dialog appears on the screen, a text field is presented for user input. However, in some cases, when the user taps on the text field, the keyboard may disappear, and the text field may lose focus. This issue is particularly annoying when you've set specific validation checks, such as ensuring a text length of 10 characters.

Symptoms of the Issue:

Keyboard disappears when tapping on the text field.

Text field loses focus when trying to enter valid input.

In our case, the dialog design is implemented using a custom widget structure, and managing the focus state of the text fields efficiently is crucial.

Steps to Resolve the Issue

Identifying the Key Components

In your original code, we noticed an issue related to how the GlobalKey was being utilized for the form. The GlobalKey<FormState> is essential in maintaining the state and validity of the form, particularly when dealing with text input validations.

The Solution

To resolve the keyboard closing issue, follow these steps:

Define a GlobalKey at the Class Level:
Ensure that the GlobalKey<FormState> is defined as a member of your _AddNewMemberPageState.

Pass the Key to the Form Widget:
Use the defined key when instantiating the Form widget to keep track of its state throughout the dialog's lifecycle.

Updated Code Snippet

Here’s an improved version of your initial code that addresses the keyboard closing problem:

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

Key Changes Made:

We created an instance of GlobalKey<FormState> as a member variable.

The Form is now correctly referencing this key, ensuring it retains focus and state properly.

Conclusion

By implementing the above improvements, you should no longer experience issues with the keyboard closing unexpectedly when interacting with the text field in your Flutter dialog. Properly utilizing the GlobalKey<FormState> allows you to manage the state of your form efficiently, thereby enhancing the user experience in your Flutter applications.

If you have any further questions or need additional assistance with your Flutter projects, feel free to reach out in the comments below!