Uri.Builder builder = new Uri.Builder();
builder.scheme("https")
        .authority("abc.com")
        .appendPath("xyz")
        .appendQueryParameter("Variable1", var1)
        .appendQueryParameter("Variable2", var2);

String url = builder.build().toString();

Hey ,

If you are making get request you can just append to the url itself with & for example

1. MYURL.apiUrl+"api/v1/resolvedcommand?q="+ Uri.encode(command)+"&apiKey="+ MYURLBUILDER.apiKey;

in above example command is the value which is being passed as a parameter.

Yes you can post variables in volley api like this.

you have to create HashMap that will contain key value pair for each variable

 HashMap<String, String> params = new HashMap<String, String>();

 params.put("key3", "value");   
 params.put("key4", "value");

    JsonObjectRequest req = new JsonObjectRequest(URL, new JSONObject(params),

       new Response.Listener<JSONObject>() {
           @Override
           public void onResponse(JSONObject response) {

               Log.e("Response:%n %s", response.toString());

           }
       }, new Response.ErrorListener() {
           @Override
           public void onErrorResponse(VolleyError error) {

              Log.e("Error: ", error.getMessage());

           }
       });

Hope this will help you.