Return data from inside an anonymous inner class for method it is contained in

I have a method that makes an API call which requires an anonymous inner class. Inside the anonymous inner class, there is an onResponse method, which has a void return type, where I can access the JSON. I want the method to return the JSON.

public JSONObject makeAPIRequest() {

 JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>(){

  @Override
  public void onResponse(JSONObject response){
   //have makeAPIRequest() return response
  }, 
  new Response.ErrorListener(){
   @Override
   public void onErrorResponse(VolleyError error){
    ...
   }
 });
}

1 answer

  • answered 2019-04-28 02:07 cricket_007

    Short answer - you need to refactor your method so it isn't procedural and use return...

    For example,

    public void makeAPIRequest(Response.Listener<JSONObject> listener) {
       JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, listener);
       // TODO: submit request
    }
    

    Then in the other classes, you have a callback acting as your "return"

    apiInstance.makeAPIRequest(new Response.Listener<JSONObject>(){
    
      @Override
      public void onResponse(JSONObject response){
         // do stuff
      }, 
      new Response.ErrorListener(){
       @Override
       public void onErrorResponse(VolleyError error){
        ...
       }
     });