Flutter : Handling Error SocketException: Connection failed (OS Error: Network is unreachable, errno = 101)

flutter dart

5,749

Make sure you are online, you are connected to internet whether it is mobile or emulator
Make sure you have given internet permission in your app's android/app/src/main/AndroidManifest.xml
```
<uses-permission android:name="android.permission.INTERNET" />
```

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Author by

Zeffry Reynando

Learning PHP , SQL , Dart

Updated on December 13, 2022

Comments

Zeffry Reynando over 1 year

I have a problem handling the error SocketException: Connection failed (OS Error: Network is unreachable, errno = 101) address = 192.168.43.159, port = 80.

What I already did :

Setting Android Permission Internet.

My Reference Making Network http error SocketException: Failed host lookup

<uses-permission android:name="android.permission.INTERNET"/>

Make function with `try catch` to handling this error

It's API function

Future loginMahasiswa(body) async {
    try {
      var apiRespon = await http.post('$baseURL/mahasiswa/login',
          body: body, headers: CrudComponent.headers);
      int statusCode = apiRespon.statusCode;
      if (statusCode == 200) {
        final apiResponJson = json.decode(apiRespon.body);
        print('Success Load Data Json ($apiResponJson)');
        return apiResponJson;
      } else {
        final apiResponJson = json.decode(apiRespon.body);
        print('fail Load Data Json $apiResponJson');
        return apiResponJson;
      }
    } catch (e) {
      print(e);
      return null;
    }
  }

It's Button Function

  void _loginMahasiswa() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    try {
      final body = {"email": _txtEmail.text, "password": _txtPassword.text};
      var loginMahasiswa = await api.loginMahasiswa(body);
      String message = loginMahasiswa['message'];
      var dataUser = loginMahasiswa['data'];
      // String idUser = dataUser[0]['id_user'] ?? "null";
      if (loginMahasiswa['status'] == true) {
        setState(() {
          preferences.setString('token', dataUser[0]['username']);
          Navigator.of(context).pushAndRemoveUntil(
              PageTransition(
                  type: PageTransitionType.rightToLeftWithFade,
                  child: HomePage()),
              (Route<dynamic> route) => false);
        });
      } else {
        print(message);
        _showSnackBar(context, message, Colors.red);
      }
    } on SocketException catch (_) {
      //throw ("No connection Internet");
       _showSnackBar(context, 'no connection', Colors.orange);
    }
  }

But my Snackbar does not show an error no connection if I click the button.

I'm using a real device to run my app and I purposely turn off the hotspot to test my app not connected to the server.

Boby almost 5 years

can you ping it via cmd or terminal?
Zeffry Reynando almost 5 years

@MyNameIs what should i ping ?
Boby almost 5 years

ping the ipaddress
Swift almost 5 years

From what I see its NoSuchMethodError exception that you are not handling
Zeffry Reynando almost 5 years

@SwiftingDuster Sorry ? So i'm not handling the SocketException ?
Zeffry Reynando almost 5 years

@MyNameIs My result ping ,Ping statistics for 192.168.43.159: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms
Aziz almost 5 years

@ZeffryReynando this means your url is up and running