What is StreamBuilder and FutureBuilder in Flutter?

As almost everything in Flutter, StreamBuilder is a Widget and as you can assume – it rebuilds its UI according to the new values that are passed via Stream it listens to . Our StreamBuilder listens to the events from provided Stream and changes Container’s background color to the newly fetched one.

If you need to build a widget based on the result of a Stream , you can use the StreamBuilder widget. You can create a Stream and pass it as the stream argument. Then, you have to pass an AsyncWidgetBuilder function which is used to build a widget based on the snapshots of the Stream .

FutureBuilder solves a square value and returns the result after 5 seconds, till then we show a progress indicator to the user. StreamBuilder shows a stopwatch, incrementing _count value by 1 every second.

FutureBuilder solves a square value and returns the result after 5 seconds, till then we show a progress indicator to the user. StreamBuilder shows a stopwatch, incrementing _count value by 1 every second.

As almost everything in Flutter, StreamBuilder is a Widget and as you can assume – it rebuilds its UI according to the new values that are passed via Stream it listens to . Our StreamBuilder listens to the events from provided Stream and changes Container’s background color to the newly fetched one.