class ListTileCustomWidget extends StatefulWidget {
  const ListTileCustomWidget({
    required this.email,
    required this.userName,
    super.key,
  });
  final String email;
  final String userName;
  @override
  State<ListTileCustomWidget> createState() => _ListTileCustomWidgetState();
}
class _ListTileCustomWidgetState extends State<ListTileCustomWidget> {
  bool _isDone = false;
  @override
  Widget build(BuildContext context) {
    return ListTile(
      trailing: GestureDetector(
        onTap: () {
          setState(() {
            _isDone = !_isDone;
          });
        },
        child: Icon(_isDone ? Icons.done : Icons.add_circle_outline),
      ),
      title: Text(widget.email),
      subtitle: Text(widget.userName),
    );
  }
}

现在传递值，

Expanded( 
                          child: Container(
                            width: ScreenSize.screenWidth,
                            child: Center(
                              child:searchResult.isEmpty? Text("Oops! Looks like you have no friends at the moment.") : ListView.builder(
itemCount: searchResult.length,
itemBuilder: (context , index){
         return ListTileCustomWidget (
email: searchResult[index]['email'],
userName : searchResult[index]['username']
    );
 
                              })
                            ),
                          ),
                        ),

创建一个状态级变量，

bool isDone = false;

单击按钮时更改变量值，并相应地更改值。

searchResult = ['john','doe','smith']; 
Expanded( 
                  child: Container(
                    width: ScreenSize.screenWidth,
                    child: Center(
                      child:searchResult.isEmpty? Text("Oops! Looks like you have no friends at the moment.") : ListView.builder(itemCount: searchResult.length,itemBuilder: (context , index){
                        return ListTile(
                          
                          
                          title: Text(searchResult[index]['username']),
                          subtitle: Text(searchResult[index]['email']),
                          
                          trailing: GestureDetector(
                            onTap: () {
                              
                              setState((){
                                  isDone = true; 
                                })
                              
                              
                            },
                            child: Icon(isDone ?  Icons.done :  Icons.add_circle_outline)),
                            
                        );
                      })
                    ),
                  ),
                ),