how to use url launcher?

[Error Place]

hi guys.

my users fill a form with information such as cellphone number , email and website address as Strings. witch are shown in a contact me page. i am trying to use the Url launcher packge to launch them but unsuccessfull, this is my code for launching the  website address!

void _launchUrl(String Url)async{
  if(await canLaunch(Url)){
    await launch(Url);
  }
  else{
    throw 'can not open Url';
  }
}

the users webAddress is Google.com 

FlatButton(
  onPressed: () {
    _launchUrl(user.webAddress);
  },

[Suzuki Tomohiro]

What’s the behavior of the code? Can you elaborate more than “unsuccessful”?

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[Error Place]

[Error Place]

this is what i am getting

[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: can not open Url

#0      _ProfileScreenState._launchUrl (package:/screen/profile_screen.dart:57:7)

<asynchronous suspension>

#1      _ProfileScreenState._displayButton.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:/screen/profile_screen.dart:448:37)

#2      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:779:19)

#3      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:862:36)

#4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)

#5      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11)

#6      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:282:5)

#7      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:254:7)

#8      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)

#9      GestureBinding.handleEvent <…>

Den måndag 8 juni 2020 kl. 15:29:20 UTC+2 skrev Error Place:

[Suzuki Tomohiro]

Good. From the error, I can tell that “await canLaunch” is returning false. Would you try adding “https://“ before the value?

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[Suzuki Tomohiro]

Glad to hear it worked.

On Mon, Jun 8, 2020 at 09:40 Error Place <reza7....@gmail.com> wrote:

You are the king Suzuki. Thank you and thank you🙏🙏🙏

[Error Place]

now i am getting stuck setting it up for calls. the thing is that users phone numbers get saved as string so i think something is wrong?

can you help me with this one as well?

this is the code for phone calls!

the same solution did not work

void _launchcaller(String number)async{

  if(await canLaunch(number)){
    await launch(number);
  }else
    {
      throw 'can not place call';
    }

}

FlatButton(
  onPressed: () {
    _launchcaller('tel:' + user.tel);
  },

Den måndag 8 juni 2020 kl. 15:29:20 UTC+2 skrev Error Place:

[Suzuki Tomohiro]

Can you give me the URL of the plugin documentation that says “tel:” should work?

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[Error Place]

https://pub.dev/packages/url_launcher

i am not sure if i used it the wrong way!! should i use call instead of tell?

Den måndag 8 juni 2020 kl. 15:29:20 UTC+2 skrev Error Place:

[Error Place]

this is how i get the phone number from the user

String _tel =  '';

TextFormField(
  initialValue: _tel,
  style: TextStyle(fontSize: 18.0),
  decoration: InputDecoration(
    icon: Icon(
      Icons.phone,
      size: 30.0,
    ),
    labelText: 'Telefonnummer',
  ),
  validator: (input) => input.trim().length > 100
      ? 'Please enter a valid name'
      : null,
  onSaved: (input) => _tel = input,
),

so it gets saved as a string ? i am not sure if i have to convert it to integer before try to make the Call Launch?

Den måndag 8 juni 2020 kl. 15:29:20 UTC+2 skrev Error Place:

[Suzuki Tomohiro]

Does this value work?

tel:+1 555 010 999

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[Suzuki Tomohiro]

You’re welcome. I didn’t know an Android emulator crashes when it tries to make a call.

On Mon, Jun 8, 2020 at 12:29 Error Place <reza7....@gmail.com> wrote:

I need to thank you Suzuki once again. Everything worked well, I was just stupid enough to not realize that I can’t make a call with the simulator 😅

I ran the app in physical device and everything worked .

Thanks again

mån 8 juni 2020 kl. 17:42 skrev Error Place <reza7....@gmail.com>:

The app crashes and Android studio loses connection with the device😥