[android] ProgressDialog spinning circle

I want to implement ProgressDialog like this one, without additional frame.:

But I'm getting this one. How could I change that?

Here is my code for ProgressDialog. Thanks in advance

private ProgressDialog mProgressDialog;
   ............
   mProgressDialog = new ProgressDialog(activity);
   mProgressDialog.setIndeterminate(false);
   mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
   ............
    public class ProgressTask extends AsyncTask <Fragment,Void,Fragment>{
            @Override
            protected void onPreExecute(){
                mProgressDialog.show();
            }

            @Override
            protected Fragment doInBackground(Fragment... arg0) {   
                    //my stuff is here
            }

            @Override
            protected void onPostExecute(Fragment result) {
                   mProgressDialog.dismiss();
            }
        }

Try this.........

ProgressDialog pd1;
pd1=new ProgressDialog(<current context reference here>);
pd1.setMessage("Loading....");
pd1.setCancelable(false);
pd1.show();

To dismiss....

if(pd1!=null)
 pd1.dismiss(); 

Put this XML to show only the wheel:

<ProgressBar
    android:indeterminate="true"
    android:id="@+id/marker_progress"
    style="?android:attr/progressBarStyle"
    android:layout_height="50dp" />

I was using View.INVISIBLE and View.VISIBLE and the ProgressBar would slowly flash instead of constantly being visible, switched to View.GONE and View.VISIBLE and it works perfectly