Resolving the Vertical viewport was given unbounded height Error in Flutter's ListView

Описание: Discover how to fix the `Vertical viewport was given unbounded height` error in Flutter when using `ListView.builder` by applying simple fixes like using `shrinkWrap: true` and `Expanded`.
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This video is based on the question https://stackoverflow.com/q/66846770/ asked by the user 'Jacob Mutale' ( https://stackoverflow.com/u/12527587/ ) and on the answer https://stackoverflow.com/a/66848345/ provided by the user 'M.M.Hasibuzzaman' ( https://stackoverflow.com/u/13742810/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Vertical viewport was given unbounded height Error in Flutter's ListView

If you're a Flutter developer, you may have encountered the dreaded Vertical viewport was given unbounded height error while working with ListView. This error typically arises when the framework is unable to determine the height of the widget as it is rendered within an unbounded vertical space. In this guide, we will delve into the causes of this error and explore effective solutions to implement in your Flutter projects.

Understanding the Error

The error message usually appears in the following format:

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This message indicates that the ListView widget is not able to find a definite height factor, often due to being inside a column that doesn't provide strict constraints on the widget's dimensions. Essentially, when using a ListView, you need to make sure it's clearly defined how much space it should take up.

Example Scenario

Given an example Flutter code snippet:

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The ListView.builder here does not have a fixed height or constraints, hence causing the error.

Solutions to Fix the Error

Option 1: Use shrinkWrap: true

One of the simplest fixes to resolve this error is by setting the shrinkWrap property in your ListView.builder:

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What Does shrinkWrap Do?

When set to true, it allows the ListView to measure its height.

This means it will only take the necessary space required for its children rather than trying to expand indefinitely.

Option 2: Use Expanded

If the ListView is intended to fill available space inside a column, wrapping it in an Expanded widget will also resolve the issue:

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Option 3: Wrap in a SizedBox or Container

If you have a fixed size for your ListView, you can use a SizedBox or a Container:

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Conclusion

Encountering errors in Flutter while working with UI layouts is common, but understanding how to resolve them is essential. By applying one of the aforementioned techniques—whether it be setting shrinkWrap to true, wrapping your list in an Expanded, or providing a fixed size—you can effectively manage the constraints of your ListView and eliminate the Vertical viewport was given unbounded height error.

Next time you find yourself facing this error, remember to implement these solutions for a smoother Flutter development experience!