获取字符串中的某个文本 - 颤动

Question

I have a list of strings i want to pass to the next screen based on which item is selected. However in the next screen how do i extract only the usernames in the string which is text 'user1' and text 'user2'

First screen's code that passed the data to second screen:

List<String> data = [
    "user1 @ 186.53",
    "user2 @ 23.432",
  ];
...
onPressed: () => Navigator.push(
                 context,
                 MaterialPageRoute(
                 builder: (context) => SecondScreen(text: '${items[index]}'),

                   ),
                ),

Second screen's code that retrieve the data:

final String text;

SecondScreen({Key key, @required this.text}) : super(key: key);

So the text contained when retrieved is:

user1 @ 186.53

how do i only extract the text 'user1' in the string above?

Answer 1

One way of doing it if @ is present in all string values.

String val = 'user1 @ 186.53';

List user = val.split('@');
print(user[0]);  // output is user1

Answer 2

String rawData = "user1 @ 186.53";
String result = rawData.split(" ")[0];

This code separates the first item in rawData separated by a space and puts it in result.

Answer 3

首先声明：在类之外List split(Pattern pattern) {} ，Now-

String data="user1 @ 186.53";

String edata= data.split(" ").elementAt(0);

print(edata);

output: user1