how to pass Java Method within a Method's parameters or different solution

I am creating a mobile application using "Android Studios." The purpose of this application is to copy the process used on an existing website (can't disclose the website for privacy reasons) The website currently returns a JSON object when using a request with the parameters "usr" (username) and "pwd" (password). Example ""

The current working system is a function inside the main activity class of the application:

public void SimpleGetRequest(String url){

// Instantiate the RequestQueue.

RequestQueue queue = Volley.newRequestQueue(this);

// Request a string response from the provided URL.

StringRequest stringRequest = new StringRequest(Request.Method.GET, url,

new Response.Listener() {



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By: StackOverFlow - Monday, 16 April

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