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Android ProgressDialog not working.when creating a new activity
public class FLActivity extends ListActivity {

    private ProgressDialog mProgressDialog;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mProgressDialog = ProgressDialog.show(FLActivity.this, "",
                                              "Loading...");

        OtherClass.LongDurationMethodWhichStartsAWorkedThread();

        mProgressDiagog.dismiss();
    }
}

// in some other class
public static LongDurationMethodWhichStartsAWorkedThread() {
    Runnable r = new FFThread();
    Thread thread = new Thread(r);

    thread.start();
    try {
        thread.join();
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch  (Exception e) {
        e.printStackTrace();
    }
}

private class LongOperation extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {
        // perform long running operation operation
        return null;
    }

    /* (non-Javadoc)
     * @see android.os.AsyncTask#onPostExecute(java.lang.Object)
     */
    @Override
    protected void onPostExecute(String result) {
        // execution of result of Long time consuming operation
    }

    /* (non-Javadoc)
     * @see android.os.AsyncTask#onPreExecute()
     */
    @Override
    protected void onPreExecute() {
    // Things to be done before execution of long running operation. For example showing ProgessDialog
    }

    /* (non-Javadoc)
     * @see android.os.AsyncTask#onProgressUpdate(Progress[])
     */
    @Override
    protected void onProgressUpdate(Void... values) {
      // Things to be done while execution of long running operation is in progress. For example updating ProgessDialog
     }
}