java - Use Http POST and GET to navigate a website -

i want android app establish connection website , through code navigate website in background. understand, first step html source code of site wish navigate managed through code:

public class httptest extends activity { private textview tvcode;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.http_layout);        tvcode = (textview)findviewbyid(r.id.tvhtmlcode);     string s = null;     try {         gethtmlsourcecode html = new gethtmlsourcecode();         html.execute("http://www.youtube.com");         s = html.get();     }     catch (exception e) {         e.printstacktrace();         tvcode.settext("error");     }     if (s != null)         tvcode.settext(s);  }  private class gethtmlsourcecode extends asynctask<string, integer, string> {     @override     protected string doinbackground(string... params) {         url url = null;         httpurlconnection conn = null;         string content = "";          try {             url = new url(params[0]);             conn = (httpurlconnection)url.openconnection();             inputstream in = conn.getinputstream();              int data = in.read();             while (data != -1) {                 char c = (char) data;                 data = in.read();                 content += c;             }         }         catch (exception e) {             e.printstacktrace();             return "error";         }         {             conn.disconnect();             return content;         }     } } 

}

(youtube used example).
after getting source code youtube.com, want app input in search box , click search button.
understand need send post request youtube fill search box, post press button , get html source code of page search result. deprecation of httpclient , httppost classes these problems appear have been solved, limited english vocabulary , general ignorance on subject make difficult find solution myself.
can help?

try using following code

import java.io.bytearrayoutputstream; import java.io.ioexception;  import org.apache.http.httpresponse; import org.apache.http.httpstatus; import org.apache.http.statusline; import org.apache.http.client.clientprotocolexception; import org.apache.http.client.httpclient; import org.apache.http.client.methods.httpget; import org.apache.http.impl.client.defaulthttpclient;  import android.os.asynctask;  public class request extends asynctask<string, string, string>{      private httpclient httpclient = new defaulthttpclient();     private httpresponse response;     private string responsestring ;     @override     protected string doinbackground(string... uri) {           statusline statusline = response.getstatusline();         try {             response = httpclient.execute(new httpget(uri[0]));             statusline = response.getstatusline();             if(statusline.getstatuscode() == httpstatus.sc_ok){                 bytearrayoutputstream out = new bytearrayoutputstream();                 response.getentity().writeto(out);                 responsestring = out.tostring();                 out.close();             } else{                  response.getentity().getcontent().close();                 throw new ioexception(statusline.getreasonphrase());             }         } catch (clientprotocolexception e) {          } catch (ioexception e) {          }         return responsestring;     }      @override     protected void onpostexecute(string result) {         super.onpostexecute(result);         //to     } } 

to make request, use following code

new requesttask().execute("http://yourwebsite.com");