android - MySQL db connection -

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i have been searching web connection between android simulator , mysql db.
i've found can't connect directly can via web server. web server handle request android.

i found following code on hello android, don't understand. if run code on simulator, nothing happens; screen stays black. log.i land, in android screen, error log, or somewhere else?
can me code?

package app.android.ticket;  import java.io.bufferedreader; import java.io.inputstream; import java.io.inputstreamreader; import java.util.arraylist;  import org.apache.http.httpentity; import org.apache.http.httpresponse; import org.apache.http.namevaluepair; import org.apache.http.client.httpclient; import org.apache.http.client.entity.urlencodedformentity; import org.apache.http.client.methods.httppost; import org.apache.http.impl.client.defaulthttpclient; import org.apache.http.message.basicnamevaluepair; import org.json.jsonarray; import org.json.jsonexception; import org.json.jsonobject;  import android.app.activity; import android.os.bundle; import android.util.log;   public class fetchdata extends activity { /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);   //call method run data retreival     getserverdata();   } public static final string key_121 = "http://www.jorisdek.nl/android/getallpeoplebornafter.php";  public fetchdata() {     log.e("fetchdata", "initialized serverlink "); }  private void getserverdata() {     inputstream = null;     string result = "";      //the year data send     arraylist<namevaluepair> namevaluepairs = new arraylist<namevaluepair>();     namevaluepairs.add(new basicnamevaluepair("year","1980"));      //http post     try{             httpclient httpclient = new defaulthttpclient();             httppost httppost = new httppost(key_121);             httppost.setentity(new urlencodedformentity(namevaluepairs));             httpresponse response = httpclient.execute(httppost);             httpentity entity = response.getentity();             = entity.getcontent();      }catch(exception e){             log.e("log_tag", "error in http connection "+e.tostring());     }      //convert response string     try{             bufferedreader reader = new bufferedreader(new inputstreamreader(is,"iso-8859-1"),8);             stringbuilder sb = new stringbuilder();             string line = null;             while ((line = reader.readline()) != null) {                     sb.append(line + "\n");             }             is.close();             result=sb.tostring();     }catch(exception e){             log.e("log_tag", "error converting result "+e.tostring());     }     //parse json data     try{             jsonarray jarray = new jsonarray(result);             for(int i=0;i<jarray.length();i++){                     jsonobject json_data = jarray.getjsonobject(i);                     log.i("log_tag","id: "+json_data.getint("id")+                             ", name: "+json_data.getstring("name")+                             ", sex: "+json_data.getint("sex")+                             ", birthyear: "+json_data.getint("birthyear")                     );             }     }catch(jsonexception e){             log.e("log_tag", "error parsing data "+e.tostring());     }      } }

logging messages go in log cat. use logcat reader.


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