Retrofit最近是非常的火，相信大家都已經在非常麻溜的使用了，還沒接觸過的同學建議先移步retrofit官網(wǎng)。
首先我們來看一下Retrofit的國際通用用法：

public class RetrofitSimple {
    private static DataServiceInterface serviceInterface;

    static {
        Retrofit.Builder retrofitBuilder = new Retrofit.Builder().baseUrl("https://api.xxxxx.com/")
                .addConverterFactory(GsonConverterFactory.create());
        serviceInterface = retrofitBuilder.build().create(DataServiceInterface.class);
    }

    public static DataServiceInterface getService() {
        return serviceInterface;
    }
}

這里每個retrofit.create方法只放回DataServiceInterface對象，在大型項目中會有多個模塊的存在，而每個模塊都會有網(wǎng)絡請求，這就會導致出現(xiàn)多個上述代碼，不符合編程之美。

    private static <T> T initService(String baseUrl, Class<T> clazz) {
        OkHttpClient.Builder builder = new OkHttpClient().newBuilder();
        OkHttpClient client = builder.build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(FastJsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .client(client)
                .build();

        return retrofit.create(clazz);
    }

上述代碼即可根據(jù)傳入的Service代碼動態(tài)生成對應的網(wǎng)絡請求管理類。這樣我們就可以根據(jù)業(yè)務邏輯創(chuàng)建多個Service。當然我們可以提供一個公共的service管理類，方便各個模塊調用。
完整代碼如下：

public final class ApiClient {
    public static String baseUrl = "https://api.xxxxx.com/";
    public static AppService appService;
    public static ModuleAService moduleAService;
    public static ModuleBService moduleBService;

    public static ApiConfiguration configuration;

    public static void init(ApiConfiguration configuration){

        ApiClient.configuration = configuration;

        appService = initService(baseUrl, AppService.class);
        moduleAService = initService(baseUrl, ModuleAService.class);
        moduleBService = initService(baseUrl, ModuleBService.class);
    }

    private static <T> T initService(String baseUrl, Class<T> clazz) {
        OkHttpClient.Builder builder = new OkHttpClient().newBuilder();
        OkHttpClient client = builder.build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(FastJsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .client(client)
                .build();

        return retrofit.create(clazz);
    }
}

Over