Saving a timer string to shared prefs

Question

I am currently making a timer app that starts on tap and stops and lists the time on another tap in a sliding up panel. I have a class that gets the string of the timer which looks like this

class Dependencies {
  final Stopwatch stopwatch = new Stopwatch();
  CurrentTime currentTime;
  List<String> savedTime = List<String>();

  transformTimeToString(int milliseconds) {
    currentTime = transformTimeToTime(stopwatch.elapsedMilliseconds);

    int hundreds = (milliseconds / 10).truncate();
    int seconds = (hundreds / 100).truncate();
    int minutes = (seconds / 60).truncate();

    String hundredsStr = (hundreds % 100).toString().padLeft(2, '0');
    String secondsStr = (seconds % 60).toString();
    String secondsMinStr = (seconds % 60).toString().padLeft(2, '0');
    String minutesStr = (minutes % 60).toString();
    if (currentTime.minutes > 0) {
      return '$minutesStr:$secondsMinStr.$hundredsStr';
    } else {
      return '$secondsStr.$hundredsStr';
    }
  }

  transformTimeToTime(int milliseconds) {
    int hundreds = (milliseconds / 10).truncate();
    int seconds = (hundreds / 100).truncate();
    int minutes = (seconds / 60).truncate();

    return CurrentTime(
      hundreds: hundreds % 100,
      seconds: seconds % 60,
      minutes: minutes % 60,
    );
  }
}

So I am having trouble listing that string on a json file to then save it to shared preferences. It would very helpful if someone with a great understanding could push me in the right direction with the code. Thanks Hunter

Here's Links to everything Timer Page,Timer String, Whole project

Solution

You're question is a bit unclear, so I am assuming you want to save the List<String> savedTime; into SharePreference and reload it again somehow.

saveTimeList(String key, List<String> savedTime) async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  prefs.setStringList(key, savedTime);
}

Retrieve like this:

Future<Set<String>> loadSavedTime(String key) async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  List<String> stringValue = prefs.getStringList(key) ?? [];
  #Input your additional code to convert String back to Time if you want
  #
  return stringValue.toSet();
}

Comments

[ByteMe]

Add the code of what you've tried for saving the saving the string to SharedPreferences

[thien nguyen]

anywhere you like