Android Volley caching with various POST requests

Question

I use Android Volley to cache requests, this works fine when I used GET, but for some reason I switched to using POST. Now I want to cache the same URL with different POST data.

• Request 1 -> URL1, POST Data = "Cat = 1"
• Request 2 -> URL1, POST Data = "Cat = 2"
• Query 3 -> URL1, POST Data = "Cat = 3"

it can be done with Android Volley

Answer 1

as Volley.Request.getCacheKey() returns a url which is the same in my case; it did not work for me.

Instead, I had to override getCacheKey () in my child class to return URL + POST (key = Value)

Thus, I was able to cache all POST requests made to the same URL with different POST data.

when you try to get a cached request, you need to build the cache key in the same way.

so here is a snapshot of my code:

 public class CustomPostRequest extends Request<String> { . . private Map<String, String> mParams; . . public void SetPostParam(String strParam, String strValue) { mParams.put(strParam, strValue); } @Override public Map<String, String> getParams() { return mParams; } @Override public String getCacheKey() { String temp = super.getCacheKey(); for (Map.Entry<String, String> entry : mParams.entrySet()) temp += entry.getKey() + "=" + entry.getValue(); return temp; } } 

When you build a new query, you can use getCacheKey () to search for a cached query first before placing it in the query queue.

Hope this helps.

Answer 2

Also, if you do not want to use one of the existing Request classes, you can follow this code (I use JsonArrayRequest here, you can use whatever you want)

 Map<String, String> params = yourData; JsonArrayRequest request = new JsonArrayRequest(Request.Method.POST, url, new Response.Listener<JSONArray>() { ... Needed codes }, new Response.ErrorListener() { ... } ){ @Override protected Map<String, String> getParams() throws AuthFailureError { return params; } @Override public String getCacheKey() { return generateCacheKeyWithParam(super.getCacheKey(), params); } }; 

and based on the Mahmoud Fayez answer , here's the generateCacheKeyWithParam() method:

 public static String generateCacheKeyWithParam(String url, Map<String, String> params) { for (Map.Entry<String, String> entry : params.entrySet()) { url += entry.getKey() + "=" + entry.getValue(); } return url; }