Android: ProgressBar in AsyncTask

[Nykeriab]

Got ProgressBar in AsyncTask, but he's out.

  @Override
    public void onCreate(Bundle savedInstanceState)
    { ...
      showList();
      ...
    }
private void showList()
{
    TextTask task = new TextTask(getApplicationContext());
    task.execute(Utils.OpenFile(nameOfFile, this));
}

class TextTask extends AsyncTask<String, Void, Void>
    {
        ProgressDialog mProgressDialog;
        Context context;

        public TextTask(Context c)
        {
            context = c;
        }

        @Override
        protected void onPreExecute()
        {
            mProgressDialog =
                    ProgressDialog.show
                            (context
                                    , "Loading"
                                    , "", true);

            mProgressDialog.setCancelable(false);
            mProgressDialog.show();
            super.onPreExecute();
        }

        @Override
        protected Void doInBackground(String... text_task)
        {
           ***
        }

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

Mistake:

Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

at android.view.ViewRootImpl.setView(ViewRootImpl.java:550)

at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:302)

at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:216)

at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:141)

at android.app.Dialog.show(Dialog.java:278)

at android.app.ProgressDialog.show(ProgressDialog.java:116)

at android.app.ProgressDialog.show(ProgressDialog.java:99)

at com...ShoppingList.BlistViewer$TextTask.onPreExecute(BlistViewer.java:364)

[emmalee]

Substitution

TextTask task = new TextTask(getApplicationContext());

♪

TextTask task = new TextTask(this);

The parameter for any Dialog should not be just a context, that is, Activity