RoboSpice + Google HTTP Client + GSON = 无法将 JSON 解析为对象答案

【问题标题】：RoboSpice + Google HTTP Client + GSON = failed to parse JSON to objectRoboSpice + Google HTTP Client + GSON = 无法将 JSON 解析为对象
【发布时间】：2015-06-09 13:40:51
【问题描述】：

我以这种方式将 RoboSpice 与 Google HTTP 客户端和 GSON 一起使用：

ApiSpiceService：

public class ApiSpiceService extends GoogleHttpClientSpiceService {

    private static final int THREAD_COUNT = 3;

    @Override
    public CacheManager createCacheManager(Application application) throws CacheCreationException {
        CacheManager cacheManager = new CacheManager();

        GsonObjectPersisterFactory gsonObjectPersisterFactory = new GsonObjectPersisterFactory(application);
        cacheManager.addPersister(gsonObjectPersisterFactory);


        return cacheManager;
    }

    @Override
    public int getThreadCount() {
        return THREAD_COUNT;
    }
}

请求：

public class InfoRequest extends GoogleHttpClientSpiceRequest<Contact> {

    private final String url;

    public InfoRequest() {
        super(Contact.class);

        this.url = "some-url/path.json";
    }

    @Override
    public Contact loadDataFromNetwork() throws Exception {
        HttpTransport httpTransport = new NetHttpTransport();
        HttpRequestFactory httpRequestFactory = httpTransport.createRequestFactory(new InfoHttpRequestInitializer());
        HttpRequest httpRequest = httpRequestFactory.buildGetRequest(new GenericUrl(url));
        httpRequest.setParser(new GsonFactory().createJsonObjectParser());

        return httpRequest.execute().parseAs(Contact.class);
    }

    private class InfoHttpRequestInitializer implements HttpRequestInitializer {

        @Override
        public void initialize(HttpRequest request) throws IOException {
        }
    }
}

模型（Contact.java）：

public class Contact {
    private String data;
}

基础活动：

public abstract class BaseActivity extends ActionBarActivity {

    protected SpiceManager spiceManager = new SpiceManager(ApiSpiceService.class);


    @Override
    protected void onStart() {
        super.onStart();

        spiceManager.start(this);
    }

    @Override
    protected void onStop() {
        spiceManager.shouldStop();

        super.onStop();
    }
}

和 MainActivity：

public class MainActivity extends BaseActivity {
   private InfoRequest infoRequest;

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        infoRequest = new InfoRequest();
    }

    @Override
    protected void onStart() {
        super.onStart();

        spiceManager.execute(infoRequest, "txt", DurationInMillis.ALWAYS_EXPIRED, new TextRequestListener());
    }

private class TextRequestListener implements RequestListener<Contact> {

        @Override
        public void onRequestFailure(SpiceException spiceException) {
           //
        }

        @Override
        public void onRequestSuccess(Contact s) {
            //
        }
    }

这似乎是有效的代码，但不幸的是，当它完成请求执行时，返回的联系人实例中的字段数据为空。 logcat 没有错误。

请求的内容是 100% 有效的 JSON。为什么不被解析？

【问题讨论】：

标签： android json gson robospice google-http-client

【解决方案1】：

好的，我找到了解决方案。我需要将@Key 注释添加到模型中的字段。这很奇怪，因为纯 Gson 不需要这个。

public class Contact {

    @Key
    private String data;

}

【讨论】：