okhttp multipart image upload with file name

Question

i am trying to upload a image to server from an android phone. this is what i have done so far

  OkHttpClient client = new OkHttpClient();
            MultipartBuilder builder = new MultipartBuilder();


builder.type(MultipartBuilder.FORM).addPart(RequestBody.create(MediaType.parse("application/json; charset=utf-8"), requestPackage.getJsonParam().toString()));
            for (int i = 0; i < requestPackage.getPics().size(); i++) {
                builder.addPart(RequestBody.create(MediaType.parse("image/png"/* + i*/), new File(URI.create(requestPackage.getPics().get(i)))));
            Log.i("image to upload",URI.create(requestPackage.getPics().get(i)).toString());
            }
            requestBody = builder.build();
     Request request = new Request.Builder().url(requestPackage.getUri()).post(requestBody).build();
            try {
                response = client.newCall(request).execute();
                if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
    //            System.out.println(response.body().string());
                return response.body().string();
            } catch (IOException e) {
                e.printStackTrace();
            }

how do i add names to the different parts.because if there is no name(key) to them then how will server side guy store it?

Answer 1

Get OkHttp 2.1, and use MultipartBuilder.addFormDataPart() which takes the filename as a parameter.

Answer 2

The syntax seems to have changed a bit since the previous answers. I'm using OkHttp 3.2.0.

public void upload(String url, File file) throws IOException {
    RequestBody formBody = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("file", file.getName(),
            RequestBody.create(MediaType.parse("image/png"), file))
        .addFormDataPart("other_field", "other_field_value")
        .build();
    Request request = new Request.Builder().url(url).post(formBody).build();
    Response response = this.client.newCall(request).execute();
}