带字符串响应的改造 [英] Retrofit with String response

问题描述

我想要对URL进行POST调用，并且作为响应，我只得到一个字符串"ok"或"no".所以我在这里有这样的界面:

I want a POST call on an URL, and as response I just get a String "ok" or "no".. So I have here my interface like this:

public interface registerAPI
{
    @FormUrlEncoded
    @POST("addDevice.php")
    Call<String> insertUser(
            @Field("name") String devicename,
            @Field("username") String regid);
}

所以我只想给POST方法两个参数，我想要一个字符串.在服务器上的PHP脚本中，是这样的:

So I just want to give the POST method the two parameters, and I want a back a String. In a PHP script on the server, there is something like this:

<?php
if(...)
   echo "ok";
else
   echo "no";

所以我用Android手机打电话

So I call on my Android-phone:

Retrofit adapter = new Retrofit.Builder()
                        .baseUrl("http://root.url.net/")
                        .addConverterFactory(GsonConverterFactory.create()) //I dont want this..
                        .build();

                registerAPI api = adapter.create(registerAPI.class);

                Call<String> call = api.insertUser(name,regid);
                call.enqueue(new Callback<String>()
                {
                    @Override
                    public void onResponse(Response<String> response, Retrofit retrofit)
                    {
                        Log.i("Error",response.message());
                    }

                    @Override
                    public void onFailure(Throwable t)
                    {
                        Log.d("Error", " Throwable is " +t.toString());

                    }
                });

因此，当我在Throwable中运行此命令时，会收到以下消息:

So, when I run this, in Throwable, I get the following message:

Unable to create converter for class java.lang.String

我是否只需要为字符串响应编写自己的转换器?那我该怎么做呢?还是有更好的方法来做到这一点?

Do I have to write my own converter just for a String-response? And how do I do that? Or is there a better way to do this?

致谢

推荐答案

好的答案是编写自己的转换器.像这样:

Ok the answer is to write an own converter. Like this:

public final class ToStringConverterFactory extends Converter.Factory {

            @Override
            public Converter<ResponseBody, ?> fromResponseBody(Type type, Annotation[] annotations) {
                //noinspection EqualsBetweenInconvertibleTypes
                if (String.class.equals(type)) {
                    return new Converter<ResponseBody, Object>() {

                        @Override
                        public Object convert(ResponseBody responseBody) throws IOException {
                            return responseBody.string();
                        }
                    };
                }

                return null;
            }

            @Override
            public Converter<?, RequestBody> toRequestBody(Type type, Annotation[] annotations) {
                //noinspection EqualsBetweenInconvertibleTypes
                if (String.class.equals(type)) {
                    return new Converter<String, RequestBody>() {

                        @Override
                        public RequestBody convert(String value) throws IOException {
                            return RequestBody.create(MediaType.parse("text/plain"), value);
                        }
                    };
                }

                return null;
            }
        }

您必须使用此名称:

Retrofit adapter = new Retrofit.Builder()
                        .baseUrl("http://root.url.net/")
                        .addConverterFactory(new ToStringConverterFactory())
                        .build();

                registerAPI api = adapter.create(registerAPI.class);

                Call<String> call = api.insertUser(name,regid);

您会收到以下答复:

call.enqueue(new Callback<String>()
                {
                    @Override
                    public void onResponse(Response<String> response, Retrofit retrofit)
                    {
                        Log.i("http","innen: " + response.message());
                        Log.i("http","innen: " + response.body()); // here is your string!!
                    }

                    @Override
                    public void onFailure(Throwable t)
                    {
                        Log.d("http", " Throwable " +t.toString());

                    }
                });

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