MvpStarterServiceFactory.java

package in.mvpstarter.sample.data.remote;

import com.facebook.stetho.okhttp3.StethoInterceptor;
import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.jakewharton.retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;

import in.mvpstarter.sample.BuildConfig;
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import timber.log.Timber;

/**
 * Provide "make" methods to create instances of {@link MvpStarterService}
 * and its related dependencies, such as OkHttpClient, Gson, etc.
 */
public class MvpStarterServiceFactory {

    public static MvpStarterService makeStarterService() {
        return makeMvpStarterService(makeGson());
    }

    private static MvpStarterService makeMvpStarterService(Gson gson) {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BuildConfig.POKEAPI_API_URL)
                .client(makeOkHttpClient())
                .addConverterFactory(GsonConverterFactory.create(gson))
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();
        return retrofit.create(MvpStarterService.class);
    }

    private static OkHttpClient makeOkHttpClient() {

        OkHttpClient.Builder httpClientBuilder = new OkHttpClient.Builder();

        if (BuildConfig.DEBUG) {
            HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor(message
                    -> Timber.d(message));
            loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
            httpClientBuilder.addInterceptor(loggingInterceptor);
            httpClientBuilder.addNetworkInterceptor(new StethoInterceptor());
        }

        return httpClientBuilder.build();
    }

    private static Gson makeGson() {
        return new GsonBuilder()
                .setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
                .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
                .create();
    }
}