Detect 'no internet' connectivity error in Retrofit 2

Question

How can I detect no internet connection error with Retrofit 2?

What I used to do in Retrofit 1 is to implement Client interface and perform connectivity check at execute(Request request).

What I attempted in Retrofit 2 is:

public class RequestInterceptor implements Interceptor {

    final ConnectivityManager connectivityManager;

    @Inject
    public RequestInterceptor(ConnectivityManager connectivityManager) {
        this.connectivityManager = connectivityManager;
    }

    @Override
    public Response intercept(Chain chain) throws IOException {
        if (isConnected()) {
            throw new OfflineException("no internet");
        }

        Request.Builder r = chain.request().newBuilder();
        return chain.proceed(r.build());
    }

    protected boolean isConnected() {
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        return networkInfo != null && networkInfo.isConnectedOrConnecting();
    }

}

I am able to catch it with synchronous Retrofit execution by adding a try-catch block, but not with asynchronous where error is returned as parameter of OnFailure(Call call, Throwable t). App just crashes with OfflineException I throw in the interceptor.

Answer 1

Found the solution.

My OfflineException class has to inherit IOException