Using drawer layout with actionbar sherlock support

gistfile1.java

package com.cube.arc.vh;

import android.app.ActionBar;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.View;
import android.widget.FrameLayout;

import com.actionbarsherlock.ActionBarSherlock;
import com.cube.arc.lib.util.Views;
import com.cube.arc.lib.util.Views.InjectView;

public class MainActivity extends FragmentActivity
{
	private ActionBarHelper mActionBar;
	private ActionBarDrawerToggle mDrawerToggle;

	@InjectView(R.id.fragment_holder) public FrameLayout holder;
	@InjectView(R.id.drawer_layout) public DrawerLayout drawer;

	@Override public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);

		mActionBar = createActionBarHelper();
		mActionBar.init();
		Views.inject(this);

		drawer.setDrawerListener(new DrawerListener());
		drawer.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
		mDrawerToggle = new ActionBarDrawerToggle(this, drawer, R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close);
	}

	@Override protected void onPostCreate(Bundle savedInstanceState)
	{
		super.onPostCreate(savedInstanceState);
		mDrawerToggle.syncState();
	}

	@Override public void onConfigurationChanged(Configuration newConfig)
	{
		super.onConfigurationChanged(newConfig);
		mDrawerToggle.onConfigurationChanged(newConfig);
	}

	private ActionBarHelper createActionBarHelper()
	{
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH)
		{
			return new ActionBarHelperICS();
		}
		else
		{
			return new ActionBarHelperGB(this);
		}
	}

	/**
	 * Stub action bar helper; this does nothing.
	 */
	private class ActionBarHelper
	{
		public void init(){}
		public void onDrawerClosed(){}
		public void onDrawerOpened(){}
		public void setTitle(CharSequence title){}
	}

	private class ActionBarHelperGB extends ActionBarHelper
	{
		private final ActionBarSherlock mActionBar;

		public ActionBarHelperGB(Activity a)
		{
			mActionBar = ActionBarSherlock.wrap(a);
			mActionBar.setContentView(R.layout.activity_main);
		}

		@Override public void init()
		{
			mActionBar.setUiOptions(ActivityInfo.UIOPTION_SPLIT_ACTION_BAR_WHEN_NARROW);
		}
	}

	private class ActionBarHelperICS extends ActionBarHelper
	{
		private final ActionBar mActionBar;
		private CharSequence mDrawerTitle;
		private CharSequence mTitle;

		ActionBarHelperICS()
		{
			mActionBar = getActionBar();
		}

		@Override public void init()
		{
			setContentView(R.layout.activity_main);
			mActionBar.setDisplayHomeAsUpEnabled(true);
			mActionBar.setHomeButtonEnabled(true);
			mTitle = mDrawerTitle = getTitle();
		}

		@Override public void onDrawerClosed()
		{
			super.onDrawerClosed();
			mActionBar.setTitle(mTitle);
		}

		@Override public void onDrawerOpened()
		{
			super.onDrawerOpened();
			mActionBar.setTitle(mDrawerTitle);
		}

		@Override public void setTitle(CharSequence title)
		{
			mTitle = title;
		}
	}

	private class DrawerListener implements DrawerLayout.DrawerListener
	{
		@Override public void onDrawerOpened(View drawerView)
		{
			mDrawerToggle.onDrawerOpened(drawerView);
			mActionBar.onDrawerOpened();
		}

		@Override public void onDrawerClosed(View drawerView)
		{
			mDrawerToggle.onDrawerClosed(drawerView);
			mActionBar.onDrawerClosed();
		}

		@Override public void onDrawerSlide(View drawerView, float slideOffset)
		{
			mDrawerToggle.onDrawerSlide(drawerView, slideOffset);
		}

		@Override public void onDrawerStateChanged(int newState)
		{
			mDrawerToggle.onDrawerStateChanged(newState);
		}
	}

	public void setPage(Class page)
	{
		FragmentManager manager = getSupportFragmentManager();
		{
			FragmentTransaction trans = manager.beginTransaction();
			Fragment f = Fragment.instantiate(this, page.getName(), null);
			trans.replace(R.id.fragment_holder, f);
			trans.commit();
		}
	}
}