java - Android ProgressDailog crashes on dismiss while in a thread -

hi trying execute code below suppose open loading dialog , dismiss in if statement.

here code:

loginbtn.setonclicklistener(new onclicklistener()           {             @override             public void onclick(view view)             {                  final progressdialog progress  = progressdialog.show(thisactivity, "please wait", "loading please wait..", true);                 thread loginthread = new thread(new runnable()                 {                      @override                     public void run()                      {                          try                         {                             boolean userallowed = login.loginuser(useremail.gettext().tostring(), userpass.gettext().tostring());                             if(userallowed)                              {                                 progress.dismiss();                                 startactivity(mainpage);                             }                             else                             {                                 progress.dismiss();                                 toast.maketext(context, "invalide email , password", toast.length_long).show();                             }                         }                         catch (exception e)                          {                             toast.maketext(context, "there problem", toast.length_long).show();                         }                      }                 });                 loginthread.start();             }          }); 

the logcat error output is:

05-09 22:37:26.508: e/androidruntime(24820): fatal exception: thread-1306 05-09 22:37:26.508: e/androidruntime(24820): java.lang.runtimeexception: can't create handler inside thread has not called looper.prepare() 05-09 22:37:26.508: e/androidruntime(24820):    @ android.os.handler.<init>(handler.java:197) 05-09 22:37:26.508: e/androidruntime(24820):    @ android.os.handler.<init>(handler.java:111) 05-09 22:37:26.508: e/androidruntime(24820):    @ android.widget.toast$tn.<init>(toast.java:324) 05-09 22:37:26.508: e/androidruntime(24820):    @ android.widget.toast.<init>(toast.java:91) 05-09 22:37:26.508: e/androidruntime(24820):    @ android.widget.toast.maketext(toast.java:238) 05-09 22:37:26.508: e/androidruntime(24820):    @ com.shale.activities.mainactivity$1$1.run(mainactivity.java:93) 05-09 22:37:26.508: e/androidruntime(24820):    @ java.lang.thread.run(thread.java:856) 

my reference this tutorial.

thanks!

as in log :

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

means trying update or access ui elements non ui thread . need use activity.runonuithread , handler or asynctask updating or accessing ui other thread. as:

 your_activity.this.runonuithread(new runnable() {        @override       public void run() {             //update ui elements here         }      });