Retrofit 2.0無法將請求正文轉換爲JSON

Question

我希望有人能幫助我。

我嘗試使用Retrofit 2.0發送帶有JSON正文的POST請求。

接口：

public interface Interface { 
    @POST(/*path*/) 
    Call<MyResponseObject> sendInt(@Body MyInteger myInt); 
} 

MyInteger類：

public class MyInteger { 
    int id; 

    public MyInteger(int id) { 
     this.id = id; 
    } 
} 

MainActivity的部分：

private Retrofit mRetrofit = null; 
private final Interface mService; 
... 
... 
mRetrofit = new Retrofit.Builder() 
       .baseUrl(/*URL*/) 
       .addConverterFactory(GsonConverterFactory.create()) 
       .build(); 
mService = mRetrofit.create(Interface.class); 

召喚：

MyInteger id = new MyInteger(0); 
mService.sendInt(id).enqueue(new Callback<MyResponseObject>() { 
    @Override 
    public void onResponse(Call<MyResponseObject> call, Response<MyResponseObject> response) {/*Log something*/} 

    @Override 
    public void onFailure(Call<MyResponseObject> call, Throwable t) {} 
}); 

在我看來是這樣的例子： https://futurestud.io/blog/retrofit-send-objects-in-request-body

但GsonConverter不能MyInteger轉換成JSON .. 下面是日誌：

java.lang.IllegalArgumentException: Unable to create @Body converter for class com.??.MyInteger (parameter #1) 
                            for method Interface.sendInt 
... 
... 
Caused by: java.lang.IllegalArgumentException: Could not locate RequestBody converter for class com.??.MyInteger. 
                          Tried: 
                           * retrofit2.BuiltInConverters 
                           * retrofit2.GsonConverterFactory 
                           at retrofit2.Retrofit.nextRequestBodyConverter(Retrofit.java:288) 
                           at retrofit2.Retrofit.requestBodyConverter(Retrofit.java:248) 
                           at retrofit2.RequestFactoryParser.parseParameters(RequestFactoryParser.java:491) 

Answer 1

我有同樣的問題。根本原因是我使用的是不兼容的庫。

這種組合適用於我：現在

<dependency> 
     <groupId>com.squareup.retrofit2</groupId> 
     <artifactId>retrofit</artifactId> 
     <version>2.0.0-beta4</version> 
    </dependency> 
    <dependency> 
    <groupId>com.google.code.gson</groupId> 
     <artifactId>gson</artifactId> 
     <version>2.6.2</version> 
    </dependency> 
    <dependency> 
     <groupId>com.squareup.retrofit2</groupId> 
     <artifactId>converter-gson</artifactId> 
     <version>2.0.0-beta4</version> 
    </dependency>