return JSON and parse in java, android

I am returning a JSON string from PHP:

<?php
$results = array(
    "result"   => "success",
    "username" => "some username",
    "projects" => "some other value"
);

echo json_encode($results);
?>

I found a java example online that works. It uses StringBuilder and outputs the response using Toast. I want to actually parse it as a JSON object so I can reference each key=>value, but not sure how to do it. This is the example I am using:

private void tryLogin(String usernameInput, String passwordInput)
{
    HttpURLConnection connection;
    OutputStreamWriter request = null;
    URL url = null;
    String response = null;
    String parameters = "username=" + usernameInput + "&password=" + passwordInput;

    try
    {
        url = new URL(getString(R.string.loginLocation));
        connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        connection.setRequestMethod("POST");

        request = new OutputStreamWriter(connection.getOutputStream());
        request.write(parameters);
        request.flush();
        request.close();
        String line = "";

        InputStreamReader isr = new InputStreamReader(connection.getInputStream());
        BufferedReader reader = new BufferedReader(isr);
        StringBuilder sb = new StringBuilder();
        while ((line = reader.readLine()) != null)
        {
            sb.append(line + "\n");
        }
        response = sb.toString();

        Toast.makeText(this, "Message from server: \n" + response, 0).show();
        isr.close();
        reader.close(); 
    }
    catch(IOException e)
    {
        Log.i("NetworkTest","Network Error: " + e);
    }
}

This is what the code currently returns:

05-04 19:19:54.724: INFO/NetworkTest(1061): {"result":"success","username":"rondog","projects":"1,2"}

Just to be clear, I am pretty sure I know how to parse the string. What I am confused on is getting the response back from the server and pushing that to the JSONObject (or is 'response' the o开发者_高级运维bject that I pass?). Any help is appreciated, thanks!

(or is 'response' the object that I pass?)

Yes, it is. It expects a string object in it's constructor to parse it.