Android : Showing Indeterminated progress in support actionbar

I read a blog article about how to show indeterminated progress in support actionabar. But unfortunately it seems not working at all.The progress doesn't show. What could be wrong?

Here is my code:

package com.test.demo;

import android.app.AlertDialog;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.ListView;    
import java.util.List;

public class DemoActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_edit_friends);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        setSupportProgressBarIndeterminateVisibility(true);
    }