Use Asynctask to display a ProgressBar in Android

Question

I am trying to do display a ProgressBar.

I am an Android beginner.

When I press the button, the task should be running in the background, but it does not display

Answer 1

You created the dialog but not showing it anywhere. Your onPreExecute() should look like:

@Override
protected void onPreExecute() {

    super.onPreExecute();
    // create dialog
    dialog=new Dialog(context);
    dialog.setCancelable(true);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setContentView(R.layout.pogressdialog);
    txtprogrss=(TextView) dialog.findViewById(R.id.txtProgress);
    progress=(ProgressBar)dialog.findViewById(R.id.progressBar2);
    btnCancel=(Button)dialog.findViewById(R.id.btnProgress);

    btnCancel.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub

            MyTask.this.cancel(true);
            dialog.dismiss();  //On button click cancel AsyncTask and dismiss dialog
        }
    });
    dialog.show();  //Show the dialog
}

You also need to dismiss the dialog when clicked on btnCancel.