android - Get PayPal Access token in Lollipop -

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so trying make app users swipe credit card , bluetooth device handle it. using paypal sdk cant seem figure out how access token use request. here current code:

    public string performpostcall(string requesturl, hashmap<string, string> postdataparams) {      url url;     string response = "";     try {         url = new url(requesturl);          httpurlconnection conn = (httpurlconnection) url.openconnection();         conn.setreadtimeout(15000);         conn.setconnecttimeout(15000);         conn.setrequestmethod("post");         conn.setdoinput(true);         conn.setdooutput(true);         conn.setrequestproperty("accept", "application/json");           outputstream os = conn.getoutputstream();         bufferedwriter writer = new bufferedwriter(                 new outputstreamwriter(os, "utf-8"));         writer.write(getpostdatastring(postdataparams));          writer.flush();         writer.close();         os.close();         int responsecode=conn.getresponsecode();          if (responsecode == httpsurlconnection.http_ok) {             string line;             bufferedreader br=new bufferedreader(new inputstreamreader(conn.getinputstream()));             while ((line=br.readline()) != null) {                 response+=line;             }         }         else {             response="";          }     } catch (exception e) {         e.printstacktrace();     }      return response; }  private string getpostdatastring(hashmap<string, string> params) throws unsupportedencodingexception {     stringbuilder result = new stringbuilder();     boolean first = true;     for(map.entry<string, string> entry : params.entryset()){         if (first)             first = false;         else             result.append("&");          result.append(urlencoder.encode(entry.getkey(), "utf-8"));         result.append("=");         result.append(urlencoder.encode(entry.getvalue(), "utf-8"));     }      return result.tostring(); }  public string getpaypaltoken() {     hashmap<string, string> params = new hashmap<string, string>();     string client_id = "no";     string secret = "no";     params.put("username", base64.encodetostring((client_id + ":" + secret).getbytes(), base64.default));     params.put("grant_type", "client_credentials");     system.out.println("params: " + params);     string output = performpostcall("https://api.sandbox.paypal.com/v1/oauth2/token", params);     system.out.println("output: " + output);     return output; }

i know unsafe put client_id , secret in android device place app going device. paypal returning nothing, , have no clue why. if give me pointers or maybe code nice. :)


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