connectivity_wrapper

This plugin allows Flutter apps provide feedback on your app when it's not connected to it, or when there's no connection.

Usage

##STEP 1: Add the package to pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^0.1.2
  connectivity_wrapper: 1.0.2

##STEP 2: Import the package to main.dart

import 'package:connectivity_wrapper/connectivity_wrapper.dart';

##STEP 3: Wrap MaterialApp/CupertinoApp with ConnectivityAppWrapper

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ConnectivityAppWrapper(
      app: MaterialApp(
        title: 'Connectivity Wrapper Example',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: MenuScreen(),
      ),
    );
  }
}

##STEP 4: The last step, Wrap your body widget with ConnectivityWidgetWrapper


class MenuScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Connectivity Wrapper Example"),
      ),
      body: ConnectivityWidgetWrapper(
        child: ListView(
          children: <Widget>[
            ListTile(
              title: Text(Strings.example1),
              onTap: () {
                AppRoutes.push(context, ScaffoldExampleScreen());
              },
            ),
            Divider(),
            ListTile(
              title: Text(Strings.example2),
              onTap: () {
                AppRoutes.push(context, CustomOfflineWidgetScreen());
              },
            ),
            Divider(),
          ],
        ),
      ),
    );
  }
}

Also, you can customize the offlineWidget . Let's see few examples.

##Custom Decoration

....
body: ConnectivityWidgetWrapper(
  decoration: BoxDecoration(
    color: Colors.purple,
    gradient: new LinearGradient(
      colors: [Colors.red, Colors.cyan],
    ),
  ),
  child: ListView(
....

##Custom Height and Message

...
body: ConnectivityWidgetWrapper(
  decoration: BoxDecoration(
    color: Colors.purple,
    gradient: new LinearGradient(
      colors: [Colors.red, Colors.cyan],
    ),
  ),
  height: 150.0,
  message: "You are Offline!",
  messageStyle: TextStyle(
    color: Colors.white,
    fontSize: 40.0,
  ),
  child: ListView(
...

##Custom Alignment and Disable User Interaction

...
body: ConnectivityWidgetWrapper(
  alignment: Alignment.topCenter,
  disableInteraction: true,
  child: ListView(
...

##Provide your own Custom Offline Widget

...
body: ConnectivityWidgetWrapper(
  disableInteraction: true,
  offlineWidget: OfflineWidget(),
  child: ListView.builder(
....

##Convert Any widget to network-aware widget

Wrap the widget RaisedButton which you want to be network-aware with ConnectivityWidgetWrapper and set stacked: false. Provide an offlineWidget to replace the current widget when the device is offline.

class NetworkAwareWidgetScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(Strings.example3),
      ),
      body: ListView(
        padding: EdgeInsets.all(20.0),
        children: <Widget>[
          TextField(
            decoration: InputDecoration(labelText: 'Email'),
          ),
          P5(),
          TextField(
            decoration: InputDecoration(labelText: 'Password'),
          ),
          P5(),
          ConnectivityWidgetWrapper(
            stacked: false,
            offlineWidget: RaisedButton(
              onPressed: null,
              color: Colors.grey,
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Text(
                      "Connecting",
                      style: TextStyle(
                        color: Colors.white,
                      ),
                    ),
                    P5(),
                    CupertinoActivityIndicator(radius: 8.0),
                  ],
                ),
              ),
            ),
            child: RaisedButton(
              onPressed: () {},
              child: Text(
                "Sign In",
                style: TextStyle(
                  color: Colors.white,
                ),
              ),
              color: Colors.blue,
            ),
          ),
        ],
      ),
    );
  }
}

Note that you should not be using the current network status for deciding whether you can reliably make a network connection. Always guard your app code against timeouts and errors that might come from the network layer.

Getting Started

This project is a starting point for a Dart package, a library module containing code that can be shared easily across multiple Flutter or Dart projects.

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

Libraries

connectivity_wrapper

Dart

VM

dart:ffi
Foreign Function Interface for interoperability with the C programming language. [...]

Web

dart:html
HTML elements and other resources for web-based applications that need to interact with the browser and the DOM (Document Object Model). [...]
dart:js
Low-level support for interoperating with JavaScript. [...]
dart:js_util
Utility methods to efficiently manipulate typed JSInterop objects in cases where the name to call is not known at runtime. You should only use these methods when the same effect cannot be achieved with @JS annotations. These methods would be extension methods on JSObject if Dart supported extension methods.