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I'd like to send a post request to server & I have multiple key-value params and a list of files like so:

@FormUrlEncoded
@POST("index.php")
Call<MyObjResponse> myCall(@Part List<MultipartBody.Part> files, @FieldMap Map<String, String> params);

I get a error:

java.lang.IllegalArgumentException: @Part parameters can only be used with multipart encoding. (parameter #1) for method IRestApi.pushLocalChangesWithMultipartCall at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:752) at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:743) at retrofit2.ServiceMethod$Builder.parameterError(ServiceMethod.java:761) at retrofit2.ServiceMethod$Builder.parseParameterAnnotation(ServiceMethod.java:592) at retrofit2.ServiceMethod$Builder.parseParameter(ServiceMethod.java:336) at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:204) at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:170) at retrofit2.Retrofit$1.invoke(Retrofit.java:147) at java.lang.reflect.Proxy.invoke(Proxy.java:913) at $Proxy5.pushLocalChangesWithMultipartCall(Unknown Source)

I tryed to put @Multipart in place of @FormUrlEncoded and error become:

java.lang.IllegalArgumentException: @FieldMap parameters can only be used with form encoding. (parameter #2) for method IRestApi.pushLocalChangesWithMultipartCall at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:752) at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:743) at retrofit2.ServiceMethod$Builder.parameterError(ServiceMethod.java:761) at retrofit2.ServiceMethod$Builder.parseParameterAnnotation(ServiceMethod.java:567) at retrofit2.ServiceMethod$Builder.parseParameter(ServiceMethod.java:336) at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:204) at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:170) at retrofit2.Retrofit$1.invoke(Retrofit.java:147) at java.lang.reflect.Proxy.invoke(Proxy.java:913) at $Proxy5.pushLocalChangesWithMultipartCall(Unknown Source)

p.s. POST is a mult I can't use PUT

Choletski
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1 Answers1

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If you want to use Multipart then you should use @PartMap instead of @FieldMap

Here is an example in another answer

https://stackoverflow.com/a/40136931/8479132

dhilmathy
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Joel Egusquiza
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