How to send MULTIPART_FORM_DATA in UTF-8 format

[misaghdroid]

I'm using spring for android. I want to create registration form in my android app. The user maybe fill out the form with utf-8 format but when data send to server and store in MySQL database I find ?????? in my database field.table's column type set to utf8_general_ci. My question is:
Do I need to set something for content type in php page OR I need set UTF-8 in my android code?
Here is my code I'm using: I did same as
here

File cacheDirectory = context.getFilesDir();
tmpFile = new File(cacheDirectory.getPath() + "/" + "avatar.png");
Resource file = new FileSystemResource(tmpFile);

MultiValueMap<String, Object> formData = new LinkedMultiValueMap<String, Object>();
formData.add("firstName", " registerFields[0]");
formData.add("lastName", registerFields[1]);
formData.add("userName", registerFields[2]);
formData.add("file", file);

HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.setContentType(MediaType.MULTIPART_ FORM_DATA);
HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<MultiValueMap<String, Object>>(
formData, requestHeaders);

// Create a new RestTemplate instance
RestTemplate restTemplate = new RestTemplate(true);

restTemplate.getMessageConverters().add(
new GsonHttpMessageConverter());
restTemplate.getMessageConverters().add(
new StringHttpMessageConverter());
ResponseEntity<Success[]> response = restTemplate.exchange(url, HttpMethod.POST, requestEntity,
Success[].class);

return response.getBody();

[Roy Clarkson]

I see from this question on StackOverflow that you solved this problem by configuring your mysql query on the server.

[misaghdroid]

Yes,exactly my problem solved that way.