Learn how to create a Stopwatch App with Flutter. Flutter provided a Stopwatch class. It can be started or stopped, and the elapsed time can be read from the elapsedMilliseconds property. So technically we can set up a page with a Stopwatch instance, then simply display the stopwatch.elapsedMilliseconds.
Okay, let’s go back to the main topic of this article: creating a stopwatch app. There are some posts about how to build a stopwatch (like this), but I would like to share an alternative approach.
The example in this post used Android Studio. If you haven’t done so, please follow the “Get started” part in the Flutter docs to setup Flutter and Android Studio.
Flutter provided a Stopwatch class. It can be started or stopped, and the elapsed time can be read from the
elapsedMilliseconds property. So technically we can set up a page with a
Stopwatch instance, then simply display the
However, there is one problem:
Stopwatch does not provide any callbacks, so we have no idea when to perform a re-render. Here the Timer class comes to the rescue. It triggers a callback with a given interval. Therefore, we can use a
Timer to trigger the re-render, read
stopwatch.elapsedMilliseconds and rebuild the page.
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