ActionBar Tab with Fragment

MainActivity.java

package com.proto.fragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.ActionBar.TabListener;
import com.github.rtyley.android.sherlock.roboguice.activity.RoboSherlockFragmentActivity;

public class MainActivity extends RoboSherlockFragmentActivity {
	private static final String TAB_INDEX = "tab_index";
	private static final String FRAGMENT1_ID = "aaa";
	private static final String FRAGMENT2_ID = "bbb";

	int savedTabIndex = 0;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.d(LOG_TAG, "MainActivity.onCreate: start...");
		setContentView(R.layout.main);

		ActionBar bar = getSupportActionBar();
		bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
		bar.setDisplayShowTitleEnabled(false);

		TabContentFragment tabFragment1 = TabContentFragment.getInstance(FRAGMENT1_ID);
		TabContentFragment tabFragment2 = TabContentFragment.getInstance(FRAGMENT2_ID);

		bar.addTab(bar.newTab().setText(FRAGMENT1_ID).setTabListener(new CustomTabListener(tabFragment1)), false);
		bar.addTab(bar.newTab().setText(FRAGMENT2_ID).setTabListener(new CustomTabListener(tabFragment2)), false);

		if (savedInstanceState != null) {
			//restore saved tab index
			savedTabIndex = savedInstanceState.getInt(TAB_INDEX, 0);
		}
	}

	@Override
	protected void onResume() {
		super.onResume();
		//select tab
		//as saved fragment is created after onCreate(), should call getTabAt().select in onResume()
		getSupportActionBar().getTabAt(savedTabIndex).select();
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		//save current tab index
		outState.putInt(TAB_INDEX, getSupportActionBar().getSelectedTab().getPosition());
		super.onSaveInstanceState(outState);
	}

	private class CustomTabListener implements TabListener {

		private TabContentFragment f;

		public CustomTabListener(TabContentFragment tabFragment1) {
			this.f = tabFragment1;
		}

		@Override
		public void onTabSelected(Tab tab, FragmentTransaction fakeFt) {
			FragmentManager fragMgr = MainActivity.this.getSupportFragmentManager();
			FragmentTransaction ft = fragMgr.beginTransaction();

			String fragmentId = f.getText();
			Fragment foundF = fragMgr.findFragmentByTag(fragmentId); //try to find current fragment

			if (foundF == null) {
				Log.d(LOG_TAG,
						"MainActivity.CustomTabListener.onTabSelected: failed to find fragment by tag. add to ft "
								+ fragmentId);
				ft.add(android.R.id.content, f, fragmentId);
			} else {
				if (f == foundF) {
					Log.d(LOG_TAG,
							"MainActivity.CustomTabListener.onTabSelected: found fragment by tag. just show it: "
									+ f.getText());
					ft.show(f);
				} else {
					Log.d(LOG_TAG, "MainActivity.CustomTabListener.onTabSelected: remove old fragment and add new "+fragmentId);
					ft.remove(foundF);
					ft.add(android.R.id.content, f, fragmentId);
				}
			}

			ft.commit();
		}

		@Override
		public void onTabUnselected(Tab tab, FragmentTransaction ft) {
			ft.hide(f);
		}

		@Override
		public void onTabReselected(Tab tab, FragmentTransaction ft) {
			//nothing to do
		}
	}

	private static final String LOG_TAG = "main";

	public static class TabContentFragment extends Fragment {

		private String mText;
		private TextView tv;

		public static TabContentFragment getInstance(String text) {
			TabContentFragment f = new TabContentFragment();
			f.mText = text;
			return f;
		}

		public String getText() {
			return mText;
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
			View fragView = inflater.inflate(R.layout.tab_fragment, container, false);
			tv = ((TextView) fragView.findViewById(R.id.tab_tv));
			tv.setText(mText);
			Log.d(LOG_TAG, "MainActivity.TabContentFragment.onCreateView:");
			return fragView;
		}

		@Override
		public void onDestroy() {
			Log.d(LOG_TAG, "MainActivity.TabContentFragment.onDestroy:");
			super.onDestroy();
		}
	}
}