android async-http上传多个文件

File[] file=new File[3];
file[0]=new File;
file[1]=new File;
file[2]=new File;
RequestParams params = new RequestParams();
try { for (int i = 0; i < file.length; i++) {  params.put("file["+i+"]", file[i], "image/jpeg");
            }
        } catch (Exception e) {
        }
        AsyncHttpClient client = new AsyncHttpClient();
        client.post("url", params, new AsyncHttpResponseHandler() {
            @Override public void onFailure(int stateCode, Header[] header, byte[] data, Throwable error) {
                uploadImageListener.callback(null);
            }
            @Override public void onSuccess(int stateCode, Header[] header, byte[] data) { if (stateCode == 200) {
                    JSONObject retObj = API.stringToJSONObject(new String(data));
                    uploadImageListener.callback(retObj);
                }
            }
        });