android - when asyntask onprogress update running, can't do another task -

i trying sensor data arduino android phone using asynctask onprogress update method. sensors's data displayed in textview , there 2 buttons turning on , off led.

the problem android phone getting real-time data arduino cannot turn on , off light @ same time. tried stop android phone getting sensor's data , tried turn on , off light. working. both getting sensor's data , turning on/off led not working simultaneously. can me problem. it's important me using project.

the android code:

package com.example.arduinoandroidasyntasktesting6;  import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstream; import java.io.inputstreamreader; import java.io.outputstream; import java.net.httpurlconnection; import java.net.url; import java.net.urlconnection;  import org.apache.http.impl.client.defaulthttpclient;  import android.app.activity; import android.os.asynctask; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.textview;  public class mainactivity extends activity {      textview data;     button on,off;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          new sensors().execute("");          data=(textview)findviewbyid(r.id.textview2);         on=(button)findviewbyid(r.id.buttonon2);         off=(button)findviewbyid(r.id.buttonoff2);           on.setonclicklistener(new onclicklistener()               {                   @override                   public void onclick(view v)                   {                       new sensors().execute("?led2=1");                 }               });            off.setonclicklistener(new onclicklistener()               {                   @override                   public void onclick(view v)                   {                       new sensors().execute("?led2=0");                 }               });      }      class sensors extends asynctask<string, byte[], string>{          inputstream nis;         outputstream nos;         bufferedreader in;         defaulthttpclient httpclient =new defaulthttpclient();         url url;         urlconnection urlconn=null;         inputstreamreader isn;         @override           protected string doinbackground(string... params) {              try{                 while(true){                 url =new url("http://192.168.1.177/"+params[0]);                 urlconn=(httpurlconnection)url.openconnection();                  nis = urlconn.getinputstream();                 in= new bufferedreader(new inputstreamreader(nis));                  string msg = in.readline();                 byte[] thebyte =msg.getbytes();                 publishprogress(thebyte);                  }             }             catch(ioexception e)             {                 e.printstacktrace();             }               return null;         }           protected void onprogressupdate(byte[]... values) {                 string command=new string(values[0]);//get string recieved bytes                 data.settext(command);             }     } } 

asynctasks executed 1 after another. starting several async tasks if first 1 not finish other ones never run.

to let them run in parallel use executor or use threads.

you use 1 async task sensing , use threads on/off buttons.