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;
@Override
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
RestAdapter.Builder().setEndpoint(serverHost)
.setClient(new ConnectivityAwareUrlClient(new OkHttpClient(), ...))