如何从retrofit2获得字符串响应？

Question

java.lang.IllegalArgumentException: Unable to create converter for class java.lang.String

public interface WebService {
    @GET("/projects")
    Call<String> jquery();
}

    Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("https://jquery.org")
       // .addConverterFactory(GsonConverterFactory.create())
        .build();

    WebService service = retrofit.create(WebService.class);
    Call<String> signin = service.jquery();

    Toast.makeText(this, signin.toString(), Toast.LENGTH_LONG).show();

如果我尝试实现一个自定义转换器（我在网上找到了一些例子），它会抱怨我没有实现抽象方法convert(F)，而这些例子都没有实现。

谢了。

Answer 1

将Retrofit2和ScalarsConverterFactory添加到您的Retrofit.Builder中。

adapterBuilder = new Retrofit.Builder()
               .addConverterFactory(ScalarsConverterFactory.create())
               .addConverterFactory(GsonConverterFactory.create());

若要使用ScalarsCoverter，请向构建梯度添加以下依赖项

implementation 'com.squareup.retrofit2:converter-scalars:2.9.0' 
implementation 'com.squareup.retrofit2:retrofit:2.9.0' //Adding Retrofit2

For API Call use: 
    Call <String> *****

Android代码：

.enqueue(new Callback<String>() {
    @Override
    public void onResponse(Call<String> call, Response<String> response) {
        Log.i("Response", response.body().toString());
        //Toast.makeText()
        if (response.isSuccessful()){
            if (response.body() != null){
                Log.i("onSuccess", response.body().toString());
            }else{
                Log.i("onEmptyResponse", "Returned empty response");//Toast.makeText(getContext(),"Nothing returned",Toast.LENGTH_LONG).show();
            }
        }