Can't POST MultiPartEntity in Android application

Question

I am trying to send an image using MultiPartEntity and HttpClient in Android, but keep getting the exception: java.lang.UnsupportedOperationException: Multipart form entity does not implement #getContent()

Here is my code:

public boolean enrollImage(String id, byte[] image) { HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost("https://example.com/"+id+"/images/"); httpPost.addHeader("Authorization", "Basic " + Base64.encodeToString(("user"+":"+"password").getBytes(),Base64.NO_WRAP)); MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE); entity.addPart("image", new ByteArrayBody(image, "image/jpg", "image.jpg")); httpPost.setEntity(entity); HttpResponse response; try { response = httpClient.execute(httpPost); HttpEntity responseEntity = response.getEntity(); String responseString = EntityUtils.toString(entity); JSONObject json = new JSONObject(responseString); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return true; }

I've added the newer Apache libraries httpmime-4.2.5.jar, httpclient-4.2.5.jar, httpcore-4.2.4.jar, and apache-mime4j-core-0.7.2.jar to my project.

How can I get this this running so that I can POST

hc.apache.org/httpcomponents-client-5.5.x/httpmime/examples/org/… you should check that example against your multipart code — Robert Rowntree
– Robert Rowntree, Commented May 31, 2013 at 15:09

QRohlf · Accepted Answer · 2013-05-31 20:31:36Z

It turns out that I was just confusing the request entity that I was sending with the response entity that I wanted to parse as json. Line 12 of that code should be

String responseString = EntityUtils.toString(responseEntity);

NOT

String responseString = EntityUtils.toString(entity);

Problem fixed. Guess it's time for me to buy a rubber duck

@QRohlf thank you for linking that wikipedia article I never read about that.

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