AlexV AlexV - 1 year ago 151
Android Question

How should I handle "No internet connection" with Retrofit on Android

I'd like to handle situations when there is no internet connection. Usually I'd run:

ConnectivityManager cm =

NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&

(from here) before sending the requests to the network and notify user if there were no internet connection.

From what I saw Retrofit does not handle this situation specifically. If there is no internet connection I'll just get
with timeout as a reason.

If I'd like to incorporate this kind of check into every HTTP request with Retrofit, how should I do it? Or should I do it at all.



Answer Source

What I ended up doing is creating a custom Retrofit client that checks for connectivity before executing a request and throws an exception.

public class ConnectivityAwareUrlClient implements Client {

    Logger log = LoggerFactory.getLogger(ConnectivityAwareUrlClient.class);

    public ConnectivityAwareUrlClient(Client wrappedClient, NetworkConnectivityManager ncm) {
        this.wrappedClient = wrappedClient;
        this.ncm = ncm;

    Client wrappedClient;
    private NetworkConnectivityManager ncm;

    public Response execute(Request request) throws IOException {
        if (!ncm.isConnected()) {
            log.debug("No connectivity %s ", request);
            throw new NoConnectivityException("No connectivity");
        return wrappedClient.execute(request);

and then use it when configuring RestAdapter

                     .setClient(new ConnectivityAwareUrlClient(new OkHttpClient(), ...))
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