See this answer – Set expiration policy for cache using Google’s Volley
This means Volley decides whether to cache response or not based only on headers “Cache-Control” and then “Expires”, “maxAge”.
What you could do is change this method
com.android.volley.toolbox.HttpHeaderParser.parseCacheHeaders(NetworkResponse response)
and ignore these headers, set entry.softTtl
and entry.ttl
fields to whatever value works for you and use your method in your request class. Here is an example:
/**
* Extracts a {@link Cache.Entry} from a {@link NetworkResponse}.
* Cache-control headers are ignored. SoftTtl == 3 mins, ttl == 24 hours.
* @param response The network response to parse headers from
* @return a cache entry for the given response, or null if the response is not cacheable.
*/
public static Cache.Entry parseIgnoreCacheHeaders(NetworkResponse response) {
long now = System.currentTimeMillis();
Map<String, String> headers = response.headers;
long serverDate = 0;
String serverEtag = null;
String headerValue;
headerValue = headers.get("Date");
if (headerValue != null) {
serverDate = HttpHeaderParser.parseDateAsEpoch(headerValue);
}
serverEtag = headers.get("ETag");
final long cacheHitButRefreshed = 3 * 60 * 1000; // in 3 minutes cache will be hit, but also refreshed on background
final long cacheExpired = 24 * 60 * 60 * 1000; // in 24 hours this cache entry expires completely
final long softExpire = now + cacheHitButRefreshed;
final long ttl = now + cacheExpired;
Cache.Entry entry = new Cache.Entry();
entry.data = response.data;
entry.etag = serverEtag;
entry.softTtl = softExpire;
entry.ttl = ttl;
entry.serverDate = serverDate;
entry.responseHeaders = headers;
return entry;
}
Use this method in your Request class like this:
public class MyRequest extends com.android.volley.Request<MyResponse> {
...
@Override
protected Response<MyResponse> parseNetworkResponse(NetworkResponse response) {
String jsonString = new String(response.data);
MyResponse MyResponse = gson.fromJson(jsonString, MyResponse.class);
return Response.success(MyResponse, HttpHeaderParser.parseIgnoreCacheHeaders(response));
}
}