What is snapshot Flutter?

Snapshot is the result of the Future or Stream you are listening to in your FutureBuilder . Before interacting with the data being returned and using it in your builder, you have to access it first.

What is stream builder in Flutter?

StreamBuilder class. Widget that builds itself based on the latest snapshot of interaction with a Stream. The builder is called at the discretion of the Flutter pipeline, and will thus receive a timing-dependent sub-sequence of the snapshots that represent the interaction with the stream.

How do you reload data when using FutureBuilder in Flutter?

You can refresh the widget by clicking on FlatButton.

What is async snapshot in Flutter?

AsyncSnapshot class Null safety. Immutable representation of the most recent interaction with an asynchronous computation. See also: StreamBuilder, which builds itself based on a snapshot from interacting with a Stream. FutureBuilder, which builds itself based on a snapshot from interacting with a Future.

What is a FutureBuilder?

FutureBuilder is a Widget that will help you to execute some asynchronous function and based on that function’s result your UI will update. FutureBuilder is Stateful by nature i.e it maintains its own state as we do in StatefulWidgets.

What is StreamBuilder stream?

StreamBuilder is a Widget that can convert a stream of user defined objects, to widgets. This takes two arguments. A stream. A builder, that can convert the elements of the stream to widgets.

When should I use StreamBuilder?

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 .

What is a StreamBuilder?

How do I call future builder again?

We would call the FutureBuilder method in Widget Build method, whenever state changes or it calls setState() method then it will invokes the Build method again and again. So it would call the FutureBuilder method again and again multiple times.

How do I refresh API data in Flutter?

Flutter – Updating Data on the Internet

1. Import the http package.
2. Update data t using the http package.
3. Convert the response into custom Dart object.
4. Get the data from the internet.
5. Update and display the response on screen.

What is snapshot Dart?

Dart’s Snapshots are like Smalltalk images in the sense that they allow nearly instant application startup. However, unlike Smalltalk images, Snapshots don’t store the program state.

What is query snapshot?

A QuerySnapshot contains zero or more DocumentSnapshot objects representing the results of a query. The documents can be accessed as an array via the docs property or enumerated using the forEach method. The number of documents can be determined via the empty and size properties.