android - AsyncTask in onCreate method -

i have simple application plays online radio. showing title online php service use asynctask , call oncreate method. in android 4 everythin ok, in android 2 it's crushed error

java.lang.runtimeexception: can't create handler inside thread has not called looper.prepare() 

then in internet found, must use code

new thread(new runnable() {          @override         public void run() {             mainactivity.this.runonuithread(new runnable() {                  @override                 public void run() {                     //my code                 }             });         }     }).start(); 

but after using tip, can't see button , text views in android 4 , android 2 versions. code:

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      //thread update title every second     new thread(new runnable() {          @override         public void run() {             mainactivity.this.runonuithread(new runnable() {                  @override                 public void run() {                     while(true) {                         try {                             new showtitle()                                 .execute("http://info.radiostyle.ru/inc/getinfo.php?getcurentsong=20383&mount=lezgifm");                             thread.sleep(1000);                         } catch (interruptedexception e) {                             string tag = "update title";                             log.e(tag, "update title crashed", e);                         }                     }                 }             });         }     }).start(); }   //get title string online source private string getmusictitle(string url) {     document doc = null;     string title = "music title";     try {         url = "http://info.radiostyle.ru/inc/getinfo.php?getcurentsong=20383&mount=lezgifm";         inputstream input = new url(url).openstream();         doc = jsoup.parse(input, "cp1251", url);         title = doc.body().text();//doc.select(".products_name").first().text();      } catch (ioexception e) {         log.e(tag, "failed load html code", e);         toast.maketext(this, "failed load title", toast.length_short).show();     }     return title; }  //class show audio title private class showtitle extends asynctask<string, void, string> {      @override     protected string doinbackground(string... urls) {         return getmusictitle(urls[0]);     }      protected void onpostexecute(final string result) {         lblmusicname.settext(result);     }  } 

edit: (my working code)

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      new showtitle()         .execute("http://info.radiostyle.ru/inc/getinfo.php?getcurentsong=20383&mount=lezgifm"); }  private string getmusictitle(string url) {     document doc = null;     string title = "music title";     try {         url = "http://info.radiostyle.ru/inc/getinfo.php?getcurentsong=20383&mount=lezgifm";         inputstream input = new url(url).openstream();         doc = jsoup.parse(input, "cp1251", url);         title = doc.body().text();      } catch (ioexception e) {         log.e(tag, "failed load html code", e);         title = "failed load title";     }     return title; }  private class showtitle extends asynctask<string, string, string> {      @override     protected string doinbackground(string... urls) {         while (true) {             string str = getmusictitle(urls[0]);             publishprogress(str);             try {                 thread.sleep(1000);             } catch (interruptedexception e) {                 string tag = "update title";                 log.e(tag, "update title crashed", e);             }         }     }      protected void onprogressupdate(string... result) {         lblmusicname.settext(result[0]);     }  } 

runonuithread , asynctask 2 different things. using in wrong way.

try this:-

protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);              new showtitle().execute("http://info.radiostyle.ru/inc/getinfo.php?getcurentsong=20383&mount=lezgifm");         }   //get title string online source private string getmusictitle(string url) {     document doc = null;     string title = "music title";     try {         url = "http://info.radiostyle.ru/inc/getinfo.php?getcurentsong=20383&mount=lezgifm";         inputstream input = new url(url).openstream();         doc = jsoup.parse(input, "cp1251", url);         title = doc.body().text();//doc.select(".products_name").first().text();      } catch (ioexception e) {         log.e(tag, "failed load html code", e);         title = "failed load title";      }     return title; }  //class show audio title private class showtitle extends asynctask<string, string, string> {      @override     protected string doinbackground(string... urls) {         string str = getmusictitle(urls[0]);         while(true) {            publishprogress(str);            try {                          thread.sleep(1000);                     } catch (interruptedexception e) {                         string tag = "update title";                         log.e(tag, "update title crashed", e);                     }         }         return str;     }      @override     protected void onprogressupdate(string... progress) {         if(returnval.startswith("failed")) {              toast.maketext(this, returnval, toast.length_short).show();         } else {              lblmusicname.settext(result);         }     }   } 

you must ui related task in onprogressupdate