Inserting String String in Vk Sdk Request

String s = new String(); s = "asasas"; VKRequest r = new VKRequest("wall.addComment", VKParameters.from("owner_id","-119852848","post_id","4","count","20","sort","desc","text",s)); 

It gives an error that the text parameter is not passed. If you write just "text","asasas"
it works. Question. How to insert the String string s into this query;