title: How to send an Integer value using Multipart.Builder
body: <p>I'm building a RequestBody this way:</p>
  
  <pre><code>RequestBody requestBody;
  MultipartBody.Builder builder = new MultipartBody.Builder().
  .setType(MultipartBody.FORM);
  
  builder = builder.addFormDataPart("key1", "value1");
  builder = builder.addFormDataPart("key2", "value2");
  etc..
  </code></pre>
  
  <p>However, I now need to add an integer (not an integer value as string).  addFormDataPart only accepts strings. I see that it can also accept another RequestBody, but I can't figure out if that could help me or not.</p>