java - 改造错误 JSONSyntaxException

Question

我最近决定使用 Android 的 Retrofit Library 来进行网络调用，并使用 GSON 来处理 JSON。但我不断收到以下异常，并且我的应用程序崩溃了。

Caused by: retrofit.RetrofitError: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 2 column 1 path $
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:383)
at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240)
at $Proxy0.getSMS(Native Method)
at package$AsyncTask.doInBackground()
Caused by: retrofit.converter.ConversionException: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 2 column 1 path $
at retrofit.converter.GsonConverter.fromBody(GsonConverter.java:67)
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:367)
... 10 more
Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 2 column 1 path $
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:200)
at com.google.gson.Gson.fromJson(Gson.java:810)
at com.google.gson.Gson.fromJson(Gson.java:775)
at retrofit.converter.GsonConverter.fromBody(GsonConverter.java:63)
... 11 more
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 2 column 1 path $
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:387)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:189)
... 14 more

我使用 postman 检查 JSON 响应，即

{"success":"true",
"message":"We are going to rock you"}

我的界面如下:

public interface CreateHTTPRequest {
public static final String END_POINT1 = "http://baseurl.com";

@POST("/user/usermob")
public NewRes getSMS(@Query(value = "mobile") String mobile);

// This is used as Model for return type
public static class NewRes {
    String success;
    String message;
}

我在 AsyncTask 中发出网络请求，如下所示:

        RestAdapter restAdapter = new RestAdapter.Builder()
        .setEndpoint(CreateHTTPRequest.END_POINT1 /*"https://api.github.com"*/)
        .build();

        CreateHTTPRequest request = restAdapter.create(CreateHTTPRequest.class);
        NewRes response = request.getSMS("123456789");

我不明白可能出了什么问题。我对使用 Retrofit 和 GSON 很陌生，所以我无法弄清楚一切。

Answer 1

尝试使用 Retrofit Callback 进行 API 调用:

public interface CreateHTTPRequest {
    public static final String END_POINT1 = "http://baseurl.com";

    @POST("/user/usermob")
    void getSMS(@Query(value = "mobile") String mobile, Callback<NewRes> callback);
}

取出NewRes并将其作为一个新类:

public class NewRes {
    String success;
    String message;
} 

将此行 NewRes response = request.getSMS("123456789"); 更改为:

final NewRes newRes;
request.getSMS("123456789", new Callback<NewRes>() {

    @Override
    public void failure(RetrofitError error) {
        //Do Something on Error
    }

    @Override
    public void success(NewRes newResResponse, Response response) {
        newRes=newResResponse;
    }
});

希望这有帮助，祝你好运!