Android - how to hide / show progressbar onclick

Question

I am trying to show a progressbar when a button is clicked. When i test the app it force closes / stops. My app works fine before the progressbar code is added in.

also

Answer 1

try following code...

handler1 = new Handler()
{
            @Override
            public void handleMessage(Message msg) 
            {
                switch(msg.what)
                {
                case 1:
                    static_class.digi_pd = ProgressDialog.show(Create_Digitizing_Job.this, "Loading...", "Please Wait..", true,false);
                    static_class.digi_pd.setCancelable(false);
                    break;
                case 2:
                    static_class.digi_pd.dismiss();
                    break;

                }
            }
        };

        thread1 = new Thread()
          {
                @Override
                public void run()
                {   
                       try
                        {  


                          handler1.sendEmptyMessage(1);

                    // write your code here....

                         handler1.sendEmptyMessage(3);
                         handler1.sendEmptyMessage(2);

                        } 
                       catch (Exception e) 
                       {
                           Log.w("thread error...",""+e);
                           //e.printStackTrace();
                       }   

             }

         };
        thread1.start();