Question 75792 in Flutter Question posted in
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Flutter – Catch error if rest api not load data and device is not on internet

This is my API

Future<void> getItems(int id) async {
    final uri = Uri.parse('$kApiUrl${kApiUrlItems}P_ID=$id');
    http.Response response = await http.get(uri).timeout(kTimeoutDuration); //5 sec

    try {
      if (response.statusCode == 200) {
        //ok
      }
      else {
        await Fluttertoast.showToast(...);
      }
    }
    on SocketException catch (e) {
        await Fluttertoast.showToast(...);
    } on TimeoutException catch (e) {
        await Fluttertoast.showToast(...);
    } catch (e) {
        await Fluttertoast.showToast(...);
    }
  }

When disable WIFI and Mobile data on emulator got error in console eg. Unhandled Exception: Failed host lookup:

Is it possible catch this error and show in Fluttertoast or snackbar?

I’m added SocketException, TimeoutException and catch but don’t get error within them!

Tags:

2

Answers


  1. 0

    You can try wrap final uri and response in try like this:

    Future<void> getItems(int id) async {
    try {
      final uri = Uri.parse('$kApiUrl${kApiUrlItems}P_ID=$id');
      http.Response response = await http.get(uri).timeout(kTimeoutDuration); //5 sec
    
      if (response.statusCode == 200) {
        //ok
      }
      else {
        await Fluttertoast.showToast(...);
      }
    }
    on SocketException catch (e) {
        await Fluttertoast.showToast(...);
    } on TimeoutException catch (e) {
        await Fluttertoast.showToast(...);
    } catch (e) {
        await Fluttertoast.showToast(...);
    }
  }
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  2. 0

    I think you need to check the internet connection first before sending the API You can check it using this https://pub.dev/packages/connectivity_plus
    after installing this update your project like this

    Future<bool> checkInternetConnection() async {
  var connectivityResult = await (Connectivity().checkConnectivity());
  if (connectivityResult == ConnectivityResult.none) {
    return false;
  } else {
    return true;
  }
}

Future<void> getItems(int id) async {
if(checkInternetConnection()){
    try {
      final uri = Uri.parse('$kApiUrl${kApiUrlItems}P_ID=$id');
      http.Response response = await http.get(uri).timeout(kTimeoutDuration); //5 sec
    
      if (response.statusCode == 200) {
        //ok
      }
      else {
        await Fluttertoast.showToast(...);
      }
    }
    on SocketException catch (e) {
        await Fluttertoast.showToast(...);
    } on TimeoutException catch (e) {
        await Fluttertoast.showToast(...);
    } catch (e) {
        await Fluttertoast.showToast(...);
    }}else{
//show toast to turn on wifi or data
    }
      }
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