Question

我的回应json喜欢

[{"user":"hasan","name":"hasan hamza"},{"user":"hüseyin","name":"hüseyin tırlak"}]

和我的班级一样

public class Person {
  public String user;
  public String name;
}

和我的Retrofit Service界面一样

  public interface IService {
    @GET(ServiceURLs.USERS)
    Call<List<Person>> getUsers(@Path("operation") String operation);
  }

我将此界面称为

    retrofit= new Retrofit.Builder()
                .baseUrl(ServiceURLs.BASE_SERVICE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
      IService service = retrofit.create(IService.class);

Call<List<Person>> response = service.getUsers(OperationEnum.SHOW.getOperation());
            response.enqueue(new Callback<List<Person>>() {
                @Override
                public void onResponse(Response<List<Person>> response, Retrofit retrofit) {
                    if (response.isSuccess()) {
                        Log.d("Size", response.body().size()+"");

                    } else {
                        // error response, no access to resource?
                    }
                }

                @Override
                public void onFailure(Throwable t) {
                    // something went completely south (like no internet connection)
                    Log.d("Error", t.getMessage());
                }
            });

当我提出此请求时，它会依据故障方法而显示

java.lang.IllegalStateException：预期为BEGIN_ARRAY，但在第1行第1列为STRING路径$ retrofit

我该如何解决呢？

我的配置

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.xyz.damn"
        minSdkVersion 14
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:21.0.3'
    compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'
    compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'
    compile 'com.squareup.okhttp:okhttp:2.5.0'

}

Answer 1

OP解决方案。

使用ResponseBody更改服务返回类型

 @GET(ServiceURLs.USERS)
    Call<ResponseBody> getUsers(@Path("operation") String operation);

然后

Call<LResponseBody> response = service.getUsers(OperationEnum.SHOW.getOperation());
        response.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Response<ResponseBody> response, Retrofit retrofit) {
                if (response.isSuccess()) {
                    Log.d("Size", response.body().size()+"");
                     try {
                    String result = response.body().string();
                    Gson gson = new Gson();
                    List<LinkedTreeMap> persons = gson.fromJson(result, ArrayList.class);
                    personList = new ArrayList<>();
                    for (LinkedTreeMap person : persons) {
                        personList.add(gson.fromJson(person.toString(), Person.class));
                    }

                } else {
                    // error response, no access to resource?
                }
            }

            @Override
            public void onFailure(Throwable t) {
                // something went completely south (like no internet connection)
                Log.d("Error", t.getMessage());
            }
        });
    });

Answer 2

我遇到了同样的问题，这是因为服务器的响应为“ null”，因此我需要一个数组，所以我所做的就是将null更改为空数组[]。最好是从服务器端执行此操作，但是如果不能，则必须按照this link的建议实施另一个Converter。

class NullOnEmptyConverterFactory implements Converter.Factory {
@Override public Converter<ResponseBody, ?> responseBody(Type type, Annotation[] 
annotations, Retrofit retrofit) {
final Converter<ResponseBody, ?> delegate = retrofit.nextResponseBodyConverter(this, 
type, annotations);
return new Converter<>() {
  @Override public void convert(ResponseBody body) {
    if (body.contentLength() == 0) return null;
    return delegate.convert(body);
     }
   };
}
}

然后添加它：

Retrofit retrofit = new Retrofit.Builder()
.endpoint(..)
.addConverterFactory(new NullOnEmptyConverterFactory())
.addConverterFactory(GsonConverterFactory.create())
.build();

改造 - 预计BEGIN_ARRAY但是STRING

2 个答案: