TabsFragmentActivity.java

package com.snot.findawatertap;

import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v4.app.FragmentTransaction;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;

import android.content.Context;


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 ActionBarActivity implements ActionBar.TabListener
{
	ViewPager	mViewPager;
	TabsAdapter	ta;
	ActionBar actionBar;


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

		ta = new TabsAdapter(getSupportFragmentManager(), this);

		actionBar = getSupportActionBar();
		final ActionBar finalActionBar = 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.
				finalActionBar.setSelectedNavigationItem(position);
			}
		});

	}

	public void addTab(int id, Class<?> cls)
	{
		addTab(getString(id), cls);
	}

	public void addTab(String title, Class<?> cls)
	{
		ta.addTab(cls);
		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());
	}

//	public Fragment getCurrent()
//	{
//		return current;
//	}

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

	private static class TabsAdapter extends FragmentPagerAdapter {
		private Context context;
		private List<Class<?>> fragments = new ArrayList<Class<?>>();

		public TabsAdapter(FragmentManager fragmentManager, Context context) {
			super(fragmentManager);
			this.context = context;
		}

		public void addTab(Class<?> cls)
		{
			fragments.add(cls);
		}

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

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