def download_image_from_server
            # Get the album id from local db
        album_record = Album.find(@params["album_id"]) 
        if album_record
    album_id = album_record.id   
    # call the api to get the image path 
            result = Rho::AsyncHttp.get(   
        :url => "some_domain.com/images.json?album_id=#{album_id}", 
              :authentication => {      
              :type => :basic,
              :username => $username,              
              :password => $password 
                         } 
                     )    
   if result["status"].upcase == "OK" && result["body"] !=""
   images = result["body"] download_failed_number = 0 
   images.each do |image|image_name = image["image_name"]     
   image_path = image["image_path"]
    # Prepare the full path of image to be stored after download     image_blob_path = File.join(Rho::RhoApplication::get_blob_folder(), image_name)  
      download_result = Rho::AsyncHttp.download_file   (                      
      :url => "some_domain.com/" + image_path,     
      :filename => image_blob_path, 
      :headers => {}                                       )                     if download_result["status"].upcase == "OK"                         download_failed_number += 1   
                  end      
           end           
      return true      
       else   
              return false  
           end  
       end
    end

Note:: Now the image has been downloaded to the applications internal memory for using in the application. If we want to store that image to some other location, we just need to do a file operation by reading the content of the image as binary data and append the contents to a new file on other location.