How to Derive String from Future<String> in Dart

Question

I wish to get a string so as to pass to the second activity in flutter from the async function below:

Future<String> getString() async {
    return await readFromFile("./abc.txt").toString();

}

My problem is getting hold of a string from the function above and use it inside onPressed() funtion, I want to navigate to the next page and wish to pass the string along to the next page. Whenever I try doing this, it gives me something like 'instance of Future...' instead of the actual string.

Yout function return a future, you should await for it String response = await getString(); So then pass the response string to the navigator — Cristian Bregant
– Cristian Bregant, Commented Dec 2, 2019 at 15:35
The slowness its caused by the readFile. Are you testing this over the emulator? — Cristian Bregant
– Cristian Bregant, Commented Dec 2, 2019 at 16:17

pr0gramista · Accepted Answer · 2019-12-02 15:54:29Z

1

You can either split the assignment or add parenthesis, because right now you actually try to await on toString.

Future<String> getString() async {
  Something content = await readFromFile("./abc.txt");
  return content.toString();
}

Future<String> getString() async {
  return (await readFromFile("./abc.txt")).toString();
}

answered Dec 2, 2019 at 15:54

pr0gramista

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