tabs_activity.xml

<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

TabsFragmentActivity.java

package com.snot.bloatware;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabWidget;

import android.app.ActionBar;
import android.app.FragmentTransaction;

import java.util.List;
import java.util.ArrayList;

/**
 * Created by snot on 6/20/13.
 */

//// Usage:
//
//public class MainActivity extends TabsFragmentActivity {
//	@Override
//	protected void onCreate(Bundle savedInstanceState) {
//		super.onCreate(savedInstanceState);
//
//		this.addTab(getString(R.string.tab_some_title), new SomeFragment());
//		this.addTab(getString(R.string.tab_some_other_title), new SomeOtherFragment());
//		this.addTab(getString(R.string.tab_yet_another_title), new YetAnotherFragment());
//	}
//}
//

public class TabsFragmentActivity extends FragmentActivity implements ActionBar.TabListener
{
	private final String TAG = this.getClass().getName();

	ViewPager	mViewPager;
	TabsAdapter	ta;
	ActionBar actionBar;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.tabs_activity);

		ta = new TabsAdapter(getSupportFragmentManager());

		actionBar = getActionBar();
		final ActionBar factionBar = actionBar;
	// Set up the action bar.
		actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

	// Setup view pager
		mViewPager = (ViewPager)findViewById(R.id.pager);
		mViewPager.setAdapter(ta);
		mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
			@Override
			public void onPageSelected(int position) {
				// When swiping between different app sections, select the corresponding tab.
				// We can also use ActionBar.Tab#select() to do this if we have a reference to the
				// Tab.
				factionBar.setSelectedNavigationItem(position);
			}
		});

	}

	public void addTab(String title, Fragment f)
	{
		ta.addTab(f);
		actionBar.addTab(actionBar.newTab().setText(title).setTabListener(this));
		ta.notifyDataSetChanged();
	}

	@Override
	public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
	}

	@Override
	public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
		// When the given tab is selected, switch to the corresponding page in the ViewPager.
		mViewPager.setCurrentItem(tab.getPosition());
	}

	@Override
	public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
	}

	private static class TabsAdapter extends FragmentPagerAdapter {
		List<Fragment> fragments = new ArrayList<Fragment>();

		public TabsAdapter(FragmentManager fragmentManager) {
			super(fragmentManager);
		}

		public void addTab(Fragment fragment)
		{
			fragments.add(fragment);
		}

		@Override
		public int getCount() {
			return fragments.size();
		}

		@Override
		public Fragment getItem(int position) {
			return fragments.get(position);
		}
	}
}