sample.java

import android.app.Application;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.squareup.okhttp.OkHttpClient;

import javax.inject.Singleton;

import dagger.Module;
import dagger.Provides;
import retrofit.Endpoint;
import retrofit.Endpoints;
import retrofit.RestAdapter;
import retrofit.client.Client;
import retrofit.converter.Converter;
import retrofit.converter.JacksonConverter;

@Module
public class ServiceModule {
    private static final int DISK_CACHE_SIZE = 50 * 1024 * 1024; // 50MB

    @Singleton
    @Provides
    OkHttpClient provideOkHttpClient(Application app) {
        OkHttpClient client = new OkHttpClient();

        // Install an HTTP cache in the application cache directory.
        File cacheDir = new File(app.getCacheDir(), "http");
        Cache cache = new Cache(cacheDir, DISK_CACHE_SIZE);
        client.setCache(cache);

        return client;
    }

    @Singleton
    @Provides
    Client provideClient(OkHttpClient client) {
        return new OkClient(client);
    }
  
    @Singleton
    @Provides
    Endpoint provideEndpoint() {
        return Endpoints.newFixedEndpoint("http://www.client.com");
    }

    @Singleton
    @Provides
    ObjectMapper provideObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        return objectMapper;
    }

    @Singleton
    @Provides
    Converter provideConverter(ObjectMapper objectMapper) {
        return new JacksonConverter(objectMapper);
    }

    @Singleton
    @Provides
    RestAdapter provideRestAdapter(Client client, Endpoint endpoint, Converter converter) {
        return new RestAdapter.Builder()
                .setClient(client)
                .setConverter(converter)
                .setEndpoint(endpoint)
                .build();
    }

    @Singleton
    @Provides
    ClientApiService provideApiService(RestAdapter restAdapter) {
        return restAdapter.create(ClientApiService.class);
    }
}