Randy Randy - 4 months ago 150
Android Question

Need to send multiple Volley Requests - in a sequence

I need to use volley to send a request to retrieve a membershipid then pass that membership id into the second volley request to retrieve stats on that member.

I have a problem with my first request working perfectly but the second request seems to start before the variable is returned to be passed. Anyone know how to prevent the second request from starting before value is returned?

Answer

you can't just write each request sequentially and wait to perform each after each success response ... you have to call second request inside first service response... ie

public void firstServiceCall(String url)
{
      JsonObjectRequest jsonObjReq = new JsonObjectRequest(
            Request.Method.GET, url, null,
            new Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject response) {
                     int membershipid=response.getInt("membershipid");
                     //suppose the membershipid comes under main json with key "membershipid"
                     secondServiceCall(membershipid,<url2>);
                     // on the response of first service ... call to the second service ... and continue so on... if required
                }
            }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
        }
    });
    Volley.newRequestQueue(getApplicationContext()).add(jsonObjReq);
  }
  public void secondServiceCall(int membershipid,String url)
  {
       // use this var membershipid acc to your need ... 
       JsonObjectRequest jsonObjReq = new JsonObjectRequest(
            Request.Method.GET, url, null,
            new Response.Listener<JSONObject>() {

                @Override
                public void onResponse(JSONObject response) {
                }
            }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
        }
    });
    Volley.newRequestQueue(getApplicationContext()).add(jsonObjReq);
  }

also the request call is asynchronous hence... the other process won't wait for service call to finish...hence your second service starts before the first service response