title: Http post in android with nested associative array
body: <p>I am trying to send an http post request to a PHP service. Here is an example of how the input may look with some test data
  <img src="https://i.stack.imgur.com/4E4BY.jpg" alt="enter image description here"></p>
  
  <p>I know that the Java alternative to the PHP associative arrays are HashMaps, but I wonder can this be done with NameValuePairs? What is the best way to format this input and call the PHP service via post request? </p>