Retrofit2单例

Question

我正在尝试为Retrofit2创建单例实例，它工作得很好。但是，只要我想要动态标题，我就不能这样做。

public class ApiManager {


    public final static String BASE_URL = "URL";



    private static ApiManager instance =null;
    private ApiModule apiModule;

    public interface ApiModule {


        @GET("exists")
        Call<ServerStatus> checkExistsTeamName(@Path("teamName") String teamName);


    }


    private ApiManager(){
        final TimeZone tz = TimeZone.getDefault();
        OkHttpClient client = new OkHttpClient();
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        try {
            client.interceptors().add(new Interceptor() {
                @Override
                public com.squareup.okhttp.Response intercept(Interceptor.Chain chain) throws
                        IOException {

                    Request original = chain.request();
                    Request request = original.newBuilder()
                            .header("X-API-Version", "1")
                            .header("X-USER-TIMEZONE", tz.getID())
                            .method(original.method(), original.body())
                            .build();


                    return chain.proceed(request);

                }
            });
        }catch (Exception e){

        }
        client.interceptors().add(interceptor);

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .client(client)
                .build();

        apiModule = retrofit.create(ApiModule.class);
    }





    public static ApiManager getInstance() {
        if(instance == null) {
            instance = new ApiManager();
        }
        return instance;
    }




    public ApiModule getService() {
        return apiModule;
    }

    public ApiModule getService(String token){
        return apiModule;
    }




}

而在另一项活动中，我可以打电话给加装公司。

apiManager.getService().checkExistsTeamName("parameters") ApiManager apiManager =ApiManager.getInstance()

它在这里工作得很好，但是如果我想要添加额外的动态标题，我应该怎么做呢？？我被困在这里了

Answer 1

你需要某种依赖注入。试试这段代码。在你打电话给你的服务之前，先打个电话

ApiManager.setHeaders(map of headers);

带有标头值。调用空映射或null来排除它们。

public class ApiManager {
    public final static String BASE_URL = "URL";
    private static ApiManager instance =null;
    private ApiModule apiModule;

    public interface ApiModule {
       @GET("exists")
       Call<ServerStatus> checkExistsTeamName(@Path("teamName") String 
       teamName);
    }

private static Map<String, String> headers = new HashMap<>();

public static void setHeaders(Map<String, String> headers) {
    ApiManager.headers = headers;
}

private ApiManager(){
    final TimeZone tz = TimeZone.getDefault();
    OkHttpClient client = new OkHttpClient();
    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    try {
        client.interceptors().add(new Interceptor() {
            @Override
            public Response intercept(Interceptor.Chain chain) throws
                    IOException {

                Request original = chain.request();
                Request.Builder builder = original.newBuilder()
                        .header("X-API-Version", "1")
                        .header("X-USER-TIMEZONE", tz.getID())
                        .method(original.method(), original.body());

                if(headers != null) {
                    for (Map.Entry<String, String> entry : headers.entrySet()) {
                        builder.header(entry.getKey(), entry.getValue());
                    }
                }

                Request request = builder.build();

                return chain.proceed(request);

            }
        });
    }catch (Exception e){

    }
    client.interceptors().add(interceptor);

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .client(client)
            .build();

    apiModule = retrofit.create(ApiModule.class);
}





public static ApiManager getInstance() {
    if(instance == null) {
        instance = new ApiManager();
    }
    return instance;
}




public ApiModule getService() {
    return apiModule;
}

public ApiModule getService(String token){
    return apiModule;
}


}

Answer 2

按照修改后的文档，如果您想要向特定请求添加标题，您可以这样做，如下所示。

可以使用@Header注释为方法设置静态标头。 @Header(“Cache-Control:max=640000”)@GET(“小部件/列表”) Call widgetList()；@Header({ "Accept: application/vnd.github.v3.ull+json“，”username:Retrofit Sample“}) @GET(”用户/{用户名}“)调用getUser(@Path(”用户名“)字符串用户名)； 请注意，标题不会相互覆盖。所有同名的标头都将包含在请求中。 可以使用@Header注释动态更新请求头。必须向@头提供相应的参数。如果值为null，则将省略标头。否则，将对值和使用的结果调用toString。 @GET(“用户”)调用getUser(@头(“授权”)字符串授权) 需要添加到每个请求中的标头可以使用OkHttp 拦截器指定。