**Error Solved: ExpansionPanel can’t be assigned to the list type ‘Widget’**
Hey there, fellow Flutter developers! Are you stuck with an error that’s driving you crazy? Today, we’re going to tackle a common issue that many of us have faced: “ExpansionPanel can’t be assigned to the list type ‘Widget'”.
**What’s the issue?**
If you’re building a custom list in Flutter and trying to use ExpansionPanel as one of your widgets, you might encounter this error. The issue arises when you’re trying to assign the ExpansionPanel to a list type, which doesn’t seem to be compatible. But don’t worry, we’ve got you covered!
**Solving the issue**
To resolve this error, you can use the `ExpansionPanelList` widget, which is specifically designed for handling multiple ExpansionPanel widgets. Here’s an example of how you can use it:
“`dart
ExpansionPanelList(
expansionCallback: (int index, bool isExpanded) {
setState(() {
isExpandedList[index] = !isExpandedList[index];
});
},
children: List.generate(4, (int index) {
return ExpansionPanel(
headerBuilder: (BuildContext context, bool isExpanded) {
return ListTile(
title: Text(‘Header $index’),
);
},
body: ListTile(
title: Text(‘Body $index’),
),
canExpand: true,
);
}),
)
“`
In this example, `ExpansionPanelList` is used to create a list of ExpansionPanel widgets. The `expansionCallback` function is used to toggle the expansion state of each panel, and the `children` property is used to add the ExpansionPanel widgets.
**Why does this work?**
`ExpansionPanelList` is specifically designed to handle multiple ExpansionPanel widgets, which makes it compatible with the list type. By using `ExpansionPanelList` instead of trying to assign the ExpansionPanel directly to the list, you’re able to resolve the error and create a custom list with ExpansionPanel widgets.
**Conclusion**
That’s it! I hope this helps you resolve the issue and continue building your Flutter app without any difficulties. Remember, it’s always a good idea to check the official Flutter documentation and online communities for any common issues you might encounter. Happy coding!
