android - how to filter data while retrieving from mongoDB hosted on mlab -


rest api codecomplete displayfitactivity code1. code retrieve data mlab , displaying in android app. 2. have used restful api connect mlab ref->youtube.com/watch?v=pi9fsrp2fyo&t=954s 3. have 4 columns in collection "bookname": "spcc", "author": "john", "price": 1234, "stock": 5, //ref mlab want filter data author name or price > 50 , price <200 etc. data(filtering condition) user in android app.so how write in method documents satisfies user filtering conditions ?//sorry if basic question 

     private string getdata(string urlpath) throws ioexception {         //  n.settext("get data");         stringbuilder result = new stringbuilder();         bufferedreader bufferedreader =null;          try {             //initialize , config request, connect server             url url = new url(urlpath);             httpurlconnection urlconnection = (httpurlconnection) url.openconnection();             urlconnection.setreadtimeout(10000 /* milliseconds */);             urlconnection.setconnecttimeout(10000 /* milliseconds */);             urlconnection.setrequestmethod("get");             urlconnection.setrequestproperty("content-type", "application/json");// set header             urlconnection.connect();              //read data response server             inputstream inputstream = urlconnection.getinputstream();             bufferedreader = new bufferedreader(new inputstreamreader(inputstream));             string line;             while ((line = bufferedreader.readline()) != null) {                  result.append(line).append("\n"); }           }          catch (jsonexception e) {             e.printstacktrace();         } {             if (bufferedreader != null) {                 bufferedreader.close();             }         }           return result.tostring();     }

and string result passed postexecute displaying data 

    @override     protected void onpostexecute(string result) {         super.onpostexecute(result);          list<books> data=new arraylist<>();          jsonarray obj ;         try {             obj = new jsonarray(result);             //obj = new jsonobject(result);             cn = new string[obj.length()];              books[] bookdata = new books[obj.length()];             (int = 0; < obj.length(); i++) {                 jsonobject jsonobj = obj.getjsonobject(i);                 // books bookdata = new books();                 string n1;                 bookdata[i] = new books();                 bookdata[i].id = jsonobj.getstring("_id");                 bookdata[i].bookname = jsonobj.getstring("bookname");                 bookdata[i].authorname = jsonobj.getstring("author");                 bookdata[i].price = integer.parseint(jsonobj.getstring("price"));                 bookdata[i].stock = integer.parseint(jsonobj.getstring("stock"));                 data.add(bookdata[i]);                 if (i == obj.length() - 1) {                     n.settext("total row = " + obj.length());                 }


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