我使用Retrofit 2 和 OkHttp3处理来自服务器的数据，在使用Min_SDK 17时出现错误，我的设备的 API也是17我尝试了这个答案：How to fix Expected Android API level 21+ but was 19 in Android我也尝试了这个答案https://github.com/square/okhttp/issues/4597#issuecomment-461204144但我得到同样的错误。我的 API 客户端    public class APIClient {private static Retrofit retrofit;private static OkHttpClient okHttpClient;public static Retrofit getInstanceRetrofit(){    if(okHttpClient==null) {        initOkHttp();    }    if(retrofit==null) {        retrofit = new Retrofit.Builder()                .baseUrl(Const.URL)                .client(okHttpClient)                .addConverterFactory(GsonConverterFactory.create())                .build();    }        return retrofit;}  private static void initOkHttp() {    int REQUEST_TIMEOUT = 60;    OkHttpClient.Builder httpClient = new OkHttpClient().newBuilder()            .connectTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)            .readTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)            .writeTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS);    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);    httpClient.addInterceptor(interceptor);    httpClient.addInterceptor(new Interceptor() {        @Override        public Response intercept(@NonNull Chain chain) throws IOException {            Request original = chain.request();            Request.Builder requestBuilder = original.newBuilder()                    .addHeader("Accept", "application/json")                    .addHeader("Content-Type", "application/json");            Request request = requestBuilder.build();            return chain.proceed(request);        }    });    okHttpClient = httpClient.build();}  }