Android FragmentTabsPager with Actionbarsherlock

ActionbarTabsPager.java

import java.util.ArrayList;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.SherlockFragmentActivity;

/**
 * Copyright (C) 2012 Simon Grätzer
 * 
 * @author [email protected]
 *
 */
public class ActionbarTabsPager extends SherlockFragmentActivity {
    ViewPager  mViewPager;
    TabsAdapter mTabsAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ActionBar bar = getSupportActionBar();
        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
        
        mViewPager = (ViewPager)findViewById(R.id.pager);
        
        // Add the tabs
        mTabsAdapter = new TabsAdapter(this, bar, mViewPager);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.example1).setIcon(R.drawable.example1),
                Example1Fragment.class, null);
        mTabsAdapter.addTab(bar.newTab().setText(R.string.example2).setIcon(R.drawable.example2),
                Example2Fragment.class, null);
        
        setTitle(R.string.app_name);

        if (savedInstanceState != null) {
            bar.setSelectedNavigationItem(savedInstanceState.getInt("tab"));
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("tab", getSupportActionBar().getSelectedNavigationIndex());
    }

    /**
     * This is a helper class that implements the management of tabs and all
     * details of connecting a ViewPager with associated TabHost.  It relies on a
     * trick.  Normally a tab host has a simple API for supplying a View or
     * Intent that each tab will show.  This is not sufficient for switching
     * between pages.  So instead we make the content part of the tab host
     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
     * view to show as the tab content.  It listens to changes in tabs, and takes
     * care of switch to the correct paged in the ViewPager whenever the selected
     * tab changes.
     */
    public static class TabsAdapter extends FragmentPagerAdapter
            implements ViewPager.OnPageChangeListener, ActionBar.TabListener {
        private final Context mContext;
        private final ActionBar mBar;
        private final ViewPager mViewPager;
        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

        static final class TabInfo {
            private final Class<?> clss;
            private final Bundle args;

            TabInfo(Class<?> _class, Bundle _args) {
                clss = _class;
                args = _args;
            }
        }

        public TabsAdapter(FragmentActivity activity, ActionBar bar, ViewPager pager) {
            super(activity.getSupportFragmentManager());
            mContext = activity;
            mBar = bar;
            mViewPager = pager;
            mViewPager.setAdapter(this);
            mViewPager.setOnPageChangeListener(this);
        }

        public void addTab(ActionBar.Tab tab, Class<? extends Fragment> clss, Bundle args) {
        	TabInfo info = new TabInfo(clss, args);
            tab.setTag(info);
            tab.setTabListener(this);
            mTabs.add(info);
            mBar.addTab(tab);
            notifyDataSetChanged();
        }

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

        @Override
        public Fragment getItem(int position) {
        	TabInfo info = mTabs.get(position);
            return Fragment.instantiate(mContext, info.clss.getName(), info.args);
        }

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }

        @Override
        public void onPageSelected(int position) {
            mBar.setSelectedNavigationItem(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {
        }

		@Override
		public void onTabSelected(Tab tab, FragmentTransaction ft) {
			Object tag = tab.getTag();
            for (int i=0; i<mTabs.size(); i++) {
                if (mTabs.get(i) == tag) {
                    mViewPager.setCurrentItem(i);
                }
            }
		}

		@Override
		public void onTabUnselected(Tab tab, FragmentTransaction ft) {
			
		}

		@Override
		public void onTabReselected(Tab tab, FragmentTransaction ft) {
			
		}
    }

}

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

</LinearLayout>

Hi,

I'm getting Null Pointer on super.onSaveInstanceState call in

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("tab", getSupportActionBar().getSelectedNavigationIndex());
}

i looked up for this problem and as per people's advice, I updated android support library to the latest. This is still happening. Do you have any clue why is this happening?
Thanks

Details are at http://stackoverflow.com/questions/13666700/sherlock-viewpager-crashes-on-onsaveinstancestate-calls

is there any way to access tab fragments from my activity?

great, thank you !!!!

Working cool! Used it for map fragment as tab with ActionBarSherlock.