Get the value associated with the query_key key. Will return NULL if the
key has no value or if the key does not exist in the URI query table. Because
NULL is returned for both missing keys and keys with no value, you should
use Uri.queryHasKey to determine if a key is present in the URI
query.
Get the value associated with the query_key key. Will return NULL if the key has no value or if the key does not exist in the URI query table. Because NULL is returned for both missing keys and keys with no value, you should use Uri.queryHasKey to determine if a key is present in the URI query.