Upload binary file with retrofit 2 in Android

Question

I want to upload a binary file to the server in Android. I test Api method by postman:

And it's OK, as you see there is another option which you can upload files as form data(key, value):

Every tutorials (like this one)describe how to upload files as multipart/form-data:

 // create RequestBody instance from file     RequestBody requestFile =             RequestBody.create(MediaType.parse("multipart/form-data"), file);      // MultipartBody.Part is used to send also the actual file name     MultipartBody.Part body =             MultipartBody.Part.createFormData("picture", file.getName(), requestFile); 

I search a lot but couldn't find any way to upload file as binary with retrofit2.

There is just one Issue in retrofit repository which ask How can I POST a image binary in retrofit 2.0 beta?. I use its solution :

API Service:

@POST("trip/{tripId}/media/photos") Call<MediaPost> postEventPhoto(     @Path("eventId") int tripId,     @Header("Authorization") String accessToken,     @Query("direction") String direction,     @Body RequestBody photo); 

Caller:

InputStream in = new FileInputStream(new File(media.getPath())); byte[] buf; buf = new byte[in.available()]; while (in.read(buf) != -1); RequestBody requestBody = RequestBody     .create(MediaType.parse("application/octet-stream"), buf); Call<MediaPost> mediaPostCall = tripApiService.postTripPhoto(     tripId,     ((GlobalInfo) getApplicationContext()).getApiAccessToken(),     direction,     requestBody); 

But I got this error:

java.lang.IllegalArgumentException: @Body parameters cannot be used with form or multi-part encoding.  

What's wrong with my code? what should I do?

Answer 1

Just adding another solution, as I had to dig a bit to understand what happened in the question in the first place.

My solution is to get the binary file as a byte[] directly and then put it inside the RequestBody. So in the end, the code would look like this:

interface RetrofitService {     @POST("api/v1/upload_file")     Call<Void> uploadBinaryFile(@Body RequestBody body); } 

And to call it:

public void uploadBinaryFile(File fileToUpload) {     retrofitService         .uploadBinaryFile(RequestBody.create(MediaType.parse("application/octet"),              Files.readAllBytes(fileToUpload)); } 

This is basically the same as OP's original question, but just for the sake of clarity I'll leave this answer as well for the next reader.

Answer 2

After hours of searching I found that there was an @Multipart annotation remains in API interface of my code from last example! which prevent to send binary data to the server and the solution in retrofit repository was OK!