java - Upload file to slack with Retrofit2 -

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i'm trying upload file (heap dump) slack channel using retrofi2 latest release version.

@override public void oncreate() {     super.oncreate();     slackapi = new retrofit.builder()             .baseurl("https://slack.com/")             .build() //             .create(slackapi.class); }   @multipart     @gtconverterannotation(value = gtconverterannotation.gson)     @post("api/files.upload")     call<responsebody> uploadfile(             @part("token") string token,             @part("file") requestbody file, @part("filetype") string filetype,             @part("filename") string filename, @part("title") string title,             @part("initial_comment") string initialcomment, @part("channels") string channels);    requestbody file = requestbody             .create(mediatype.parse("multipart/form-data"), heapdump.heapdumpfile);     final call<responsebody> call = slackapi.uploadfile(slackapi.token,             file,             null,             heapdump.heapdumpfile.getname(), title, initialcomment,             slackapi.memory_leak_channel);

the following code fail exception before execution @ "slack.uploafile" following exception:

> e/androidruntime: fatal exception: intentservice[com.squareup.leakcanary.abstractanalysisresultservice] process: com.gettaxi.dbx.android, pid: 11127 java.lang.illegalargumentexception: not locate requestbody converter class java.lang.string. tried: * retrofit2.builtinconverters @ retrofit2.retrofit.nextrequestbodyconverter(retrofit.java:298) @ retrofit2.retrofit.requestbodyconverter(retrofit.java:258) @ retrofit2.servicemethod$builder.parseparameterannotation(servicemethod.java:577) @ retrofit2.servicemethod$builder.parseparameter(servicemethod.java:328) @ retrofit2.servicemethod$builder.build(servicemethod.java:201) @ retrofit2.retrofit.loadservicemethod(retrofit.java:166) @ retrofit2.retrofit$1.invoke(retrofit.java:145) @ java.lang.reflect.proxy.invoke(proxy.java:397) @ $proxy13.uploadfile(unknown source) @ com.gettaxi.dbx.android.services.leakslackuploadservice.afterdefaulthandling(leakslackuploadservice.java:50) @ com.squareup.leakcanary.displayleakservice.onheapanalyzed(displayleakservice.java:86) @ com.squareup.leakcanary.abstractanalysisresultservice.onhandleintent(abstractanalysisresultservice.java:49) @ android.app.intentservice$servicehandler.handlemessage(intentservice.java:65) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:135) @ android.os.handlerthread.run(handlerthread.java:61)

what missing? why it's looking requestbody converter string?

update created full solution similar matrix suggest: https://gist.github.com/parahall/cbba57d9d10f6dcd850f

first want note there other ways of achieving went ahead making sure solution works no major drawbacks.

please check out repo here: update: url , repo name has changed https://github.com/matrixy/slackrofit

pasting relevant code well: 

@multipart @post("api/files.upload") call<uploadfileresponse> uploadfile(         @query("token") string token,         @partmap map<string, requestbody> params,         @query("filetype") string filetype,         @query("filename") string filename, @query("title") string title,         @query("initial_comment") string initialcomment, @query("channels") string channels);      slackapi = new retrofit.builder().baseurl("https://slack.com/").client(new okhttpclient())             .addconverterfactory(gsonconverterfactory.create())             .build().create(slackapi.class);       string str = "google places api android samples\n" +             "===================================\n" +             "\n" +             "samples use [google places api android](https://developers.google.com/places/android/).\n" +             "\n" +             "this repo contains following samples:";     file = requestbody.create(mediatype.parse("multipart/form-data"), str.getbytes());      map<string, requestbody> map = new hashmap<>();     map.put("file\"; filename=\"heapdump.md\"", file);     call = slackapi.uploadfile(slackapi.token, map, "text",  "heapdump.md", "test dump", "check out", slackapi.memory_leak_channel);

later on activate call: 

call.clone().enqueue(new callback<slackapi.uploadfileresponse>() {     @override     public void onresponse(call<slackapi.uploadfileresponse> call, response<slackapi.uploadfileresponse> response) {         if (response != null) {             log.e("gag", response.body().tostring());         }     }      @override     public void onfailure(call<slackapi.uploadfileresponse> call, throwable t) {         t.printstacktrace();     } });

i'm using clone test multiple uploads while allows me not rebuild new call every time want use it.

uploadfileresponse simple: 

public static class uploadfileresponse {      boolean ok;     string error;      @override     public string tostring() {         return "uploadfileresponse{" +                 "ok=" + ok +                 ", error='" + error + '\'' +                 '}';     } }

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