to make an sms app without internet connectivity

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Abinavan Nagendran

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Jun 22, 2020, 1:43:26 AM6/22/20

to Flutter Development (flutter-dev)

Hi, I'm new to flutter. I want to make an SMS app without the need for internet connectivity. Suggest me some packages regarding this..
I used flutter_sms... This is my code

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

import 'package:flutter_sms/flutter_sms.dart';

import 'dart:io' show Platform;
import 'package:flutter/foundation.dart';

// The existing imports
// !! Keep your existing impots here !!

/// main is entry point of Flutter application
void main() {
  WidgetsFlutterBinding.ensureInitialized();
  if (!kIsWeb) _setTargetPlatformForDesktop();
  return runApp(MyApp());
}

/// If the current platform is desktop, override the default platform to
/// a supported platform (iOS for macOS, Android for Linux and Windows).
/// Otherwise, do nothing.
void _setTargetPlatformForDesktop() {
  TargetPlatform targetPlatform;
  if (Platform.isMacOS) {
    targetPlatform = TargetPlatform.iOS;
  } else if (Platform.isLinux || Platform.isWindows) {
    targetPlatform = TargetPlatform.android;
  }
  if (targetPlatform != null) {
    debugDefaultTargetPlatformOverride = targetPlatform;
  }
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  TextEditingController _controllerPeople, _controllerMessage;
  String _message, body;
  String _canSendSMSMessage = "Check is not run.";
  List<String> people = [];

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  Future<void> initPlatformState() async {
    _controllerPeople = TextEditingController();
    _controllerMessage = TextEditingController();
  }

  void _sendSMS(List<String> recipents) async {
    try {
      String _result = await sendSMS(
          message: _controllerMessage.text, recipients: recipents);
      setState(() => _message = _result);
    } catch (error) {
      setState(() => _message = error.toString());
    }
  }

  void _canSendSMS() async {
    bool _result = await canSendSMS();
    setState(() => _canSendSMSMessage =
        _result ? 'This unit can send SMS' : 'This unit cannot send SMS');
  }

  Widget _phoneTile(String name) {
    return Padding(
      padding: const EdgeInsets.all(3.0),
      child: Container(
          decoration: BoxDecoration(
              border: Border(
            bottom: BorderSide(color: Colors.grey[300]),
            top: BorderSide(color: Colors.grey[300]),
            left: BorderSide(color: Colors.grey[300]),
            right: BorderSide(color: Colors.grey[300]),
          )),
          child: Padding(
            padding: EdgeInsets.all(4.0),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                IconButton(
                  icon: Icon(Icons.close),
                  onPressed: () => setState(() => people.remove(name)),
                ),
                Padding(
                  padding: const EdgeInsets.all(0.0),
                  child: Text(
                    name,
                    textScaleFactor: 1.0,
                    style: TextStyle(fontSize: 12.0),
                  ),
                )
              ],
            ),
          )),
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('SMS/MMS Example'),
        ),
        body: ListView(
          children: <Widget>[
            people == null || people.isEmpty
                ? Container(
                    height: 0.0,
                  )
                : Container(
                    height: 90.0,
                    child: Padding(
                      padding: const EdgeInsets.all(3.0),
                      child: ListView(
                        scrollDirection: Axis.horizontal,
                        children:
                            List<Widget>.generate(people.length, (int index) {
                          return _phoneTile(people[index]);
                        }),
                      ),
                    ),
                  ),
            ListTile(
              leading: Icon(Icons.people),
              title: TextField(
                controller: _controllerPeople,
                decoration: InputDecoration(labelText: "Add Phone Number"),
                keyboardType: TextInputType.number,
                onChanged: (String value) => setState(() {}),
              ),
              trailing: IconButton(
                icon: Icon(Icons.add),
                onPressed: _controllerPeople.text.isEmpty
                    ? null
                    : () => setState(() {
                          people.add(_controllerPeople.text.toString());
                          _controllerPeople.clear();
                        }),
              ),
            ),
            Divider(),
            ListTile(
              leading: Icon(Icons.message),
              title: TextField(
                decoration: InputDecoration(labelText: " Add Message"),
                controller: _controllerMessage,
                onChanged: (String value) => setState(() {}),
              ),
            ),
            Divider(),
            ListTile(
              title: Text("Can send SMS"),
              subtitle: Text(_canSendSMSMessage),
              trailing: IconButton(
                padding: EdgeInsets.symmetric(vertical: 16),
                icon: Icon(Icons.check),
                onPressed: () {
                  _canSendSMS();
                },
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: RaisedButton(
                color: Theme.of(context).accentColor,
                padding: EdgeInsets.symmetric(vertical: 16),
                child: Text("SEND",
                    style: Theme.of(context).accentTextTheme.button),
                onPressed: () {
                  _send();
                },
              ),
            ),
            Visibility(
              visible: _message != null,
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child: Padding(
                      padding: const EdgeInsets.all(12.0),
                      child: Text(
                        _message ?? "No Data",
                        maxLines: null,
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _send() {
    if (people == null || people.isEmpty) {
      setState(() => _message = "At Least 1 Person or Message Required");
    } else {
      _sendSMS(people);
    }
  }
}

The error is

Using hardware rendering with device AOSP on IA Emulator. If you get graphics artifacts, consider enabling software rendering with "--enable-software-rendering".
Launching lib\main.dart on AOSP on IA Emulator in debug mode...

Compiler message:
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_sms-2.0.1+2/lib/src/flutter_sms_platform.dart:3:8: Error: Not found: 'dart:html'
import 'dart:html' as html;
^
Plugin project :url_launcher_web not found. Please update settings.gradle.
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_sms-2.0.1+2/lib/src/flutter_sms_platform.dart:90:27: Error: Getter not found: 'window'.
final _agent = html.window.navigator.userAgent;
^^^^^^
Note: C:\flutter.pub-cache\hosted\pub.dartlang.org\android_intent-0.3.7+2\android\src\main\java\io\flutter\plugins\androidintent\MethodCallHandlerImpl.java uses unchecked or
unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Invalid depfile: C:\Users\ABINAV\Desktop\receive.dart_tool\flutter_build\8ce715169fee625519bd32553d875ab6\kernel_snapshot.d
Invalid depfile: C:\Users\ABINAV\Desktop\receive.dart_tool\flutter_build\8ce715169fee625519bd32553d875ab6\kernel_snapshot.d

Compiler message:
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_sms-2.0.1+2/lib/src/flutter_sms_platform.dart:3:8: Error: Not found: 'dart:html'
import 'dart:html' as html;
^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_sms-2.0.1+2/lib/src/flutter_sms_platform.dart:90:27: Error: Getter not found: 'window'.
final _agent = html.window.navigator.userAgent;
^^^^^^
Unhandled exception:
FileSystemException(uri=org-dartlang-untranslatable-uri:dart%3Ah
tml; message=StandardFileSystem only supports file:* and data:* URIs)
#0 StandardFileSystem.entityForUri (package:front_end/src/api_prototype/standard_file_system.dart:33:7)
#1 asFileUri (package:vm/kernel_front_end.dart:567:37)
#2 writeDepfile (package:vm/kernel_front_end.dart:760:21)

#3 FrontendCompiler.compile (package:frontend_server/fro
ntend_server.dart:539:15)

#4 _FlutterFrontendCompiler.compile (package:flutter_frontend_server/server.dart:40:22)
#5 starter (package:flutter_frontend_server/server.dart:178:27)
#6 main (file:///C:/b/s/w/ir/cache/builder/src/flutter/flutter_frontend_server/bin/starter.dart:8:30)
#7 _startIsolate. (dart:isolate-patch/isolate_patch.dart:299:32)
#8 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)

Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
build failed.

FAILURE: Build failed with an exception.

Where:
Script 'C:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 882
What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.

Process 'command 'C:\flutter\bin\flutter.bat'' finished with non-zero exit value 1

Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
Get more help at https://help.gradle.org

BUILD FAILED in 34s
Running Gradle task 'assembleDebug'...
Running Gradle task 'assembleDebug'... Done 35.9s
Exception: Gradle task assembleDebug failed with exit code 1

Can you help me to clear this or suggest other packages with reference code

Hugo van Galen

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Jun 22, 2020, 2:34:42 AM6/22/20

to Abinavan Nagendran, Flutter Development (flutter-dev)

This seems to be a known issue, dart:html is included but that doesn't work on mobile. See https://github.com/fluttercommunity/flutter_sms/issues -- suggestions there are to downgrade to a previous version.

Hope this helps.

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