How to set up dynamically Part in MultipartRequestEntity

Question

Hello,

I'm using commons-httpclient-3.1 inside my android application. And I would like to know if it possible to manipulate Part (org.apache.commons.httpclient.methods.multipart.Part) dynamically? Essentially adding new FilePart and new StringPart at runtime before sending the request.

Every example I've found until now suppose that you know how many fields you are dealing with. Ex:

File f = new File("/path/fileToUpload.txt");
PostMethod filePost = new PostMethod("http://host/some_path");
Part[] parts = {
    new StringPart("param_name", "value"),
    new FilePart(f.getName(), f)
};
filePost.setRequestEntity(
    new MultipartRequestEntity(parts, filePost.getParams())
    );
HttpClient client = new HttpClient();
int status = client.executeMethod(filePost);

code from http://hc.apache.org/httpclient-3.x/apidocs/org/apache/commons/httpclient/methods/multipart/MultipartRequestEntity.html

Android specific thread: http://groups.google.com/group/android-developers/browse_thread/thread/0f9e17bbaf50c5fc

Thank you