waiting_dialog

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Este plugin te ayudará visualmente a mostrar un CircularProgressIndicator mientras procesas una petición.

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:waiting_dialog/waiting_dialog.dart';

...
Future _doLongProcess() async {
	// aquí simulamos una petición de 5 segundos
	// un ejemplo de su uso puede ser consumir un servicio REST/SOAP
	await Future.delayed(Duration(seconds: 5));
}

void _onPressed() {
	showWaitingDialog(
		context: _key.currentState.overlay.context,
		onWaiting: () async => await _doLongProcess(),
		strokeWidth: 12.0,
		onDone: () {
		  // una vez que termina la espera de procesar
		  print('is done!');
		});
}
...

screenshot

Libraries

waiting_dialog

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]