public class MyActionbarActivity extends BaseActionbarActivity{
		......
		@Override
		protected void onActivityCreated(Bundle savedInstanceState) {
			// TODO this method will be involved when all start-up tasks are done.
			// Do your own work here
		}
		
		@Override
		protected int setupContentVew() {
			// TODO return your main content view layout
			return R.layout.my_actionbar_activity;
		}
		
		@Override
		protected Drawable setupThemeColor() {
			// TODO return your actionbar background color (or image) here
			return new ColorDrawable(Color.RED);
		}

		@Override
		protected boolean onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
			// TODO inflate your actionbar menu item here 
			inflater.inflate(R.menu.setting, menu);
			
			//return false to allow normal menu processing to proceed, true to consume it here.
			//simplely say that must return true if you want onMenuItemSelected(MenuItem menu)
			//be involved when an action bar item is click
			return true; 
		}
		
		@Override
		protected void onMenuItemSelected(MenuItem menu) {
			// TODO this method will be involved when an menu item is selected or clicked
			switch (menu.getItemId()){
			case android.R.id.home:
				finish();
				break;
			default:
				break;
			}
		}
		......
	}

  public class DrawerActivity extends BaseNavigationDrawerActivity{
    
	......
  	@Override
  	protected void setupNavigationDrawerItem(ExtendableListView listView,
  			BaseNavigationDrawerListAdapter navigationListAdapter) {
  		// TODO add the navigation menu item here
  		listView.setBackgroundColor(Color.WHITE);
  		navigationListAdapter.addItem("item 1", 
  		  DrawableUtil.getDrawable(this, R.drawable.ic_chat_grey600_24dp));
  		navigationListAdapter.addItem("item 2", 
  		  DrawableUtil.getDrawable(this, R.drawable.ic_chat_grey600_24dp));
  	}
    ......
  }

  public class MainActivity extends BaseTabbableActionbarActivity{
    ......
  	@Override
  	protected void setupViewPager(ViewPager viewPager) {
  		// TODO setup contents for viewPage (tab number depands on how many fragment added to the viewPager).
  		BaseFragmentPagerAdapter adapter = new BaseFragmentPagerAdapter(getSupportFragmentManager());
  		adapter.addFragment(new TestFragment(), "Section 1");
  		adapter.addFragment(new TestFragment(), "Section 2");
  		viewPager.setAdapter(adapter);
  	}
  	
  	@Override
  	protected Drawable setupTabIcon(int pisiton) {
  		// TODO return an icon for each tab (if necessary)
  		return null;
  	}
    ......
  }

	public class TestSearchbarActivity extends BaseSearchBarActivity{
		......
		@Override
		protected void onSearch(String Keyword) {
			// TODO this method will be involved when the Search button is clicked.
			doSearch(Keyword);
		}

		@Override
		protected void onCleanKeyword() {
			// TODO this method will be involved when the user clean the search keywords.
		}
		......
	}

	public class TestCollapsingActictionbarActivity extends BaseCollapsingActionbarActivity{

		......
		@Override
		public View setupCollapsingView() {
			// TODO return the header view here (which is under the action bar)
			return null;
		}

		@Override
		public View setupContentView() {
			// TODO return the main content view here 
			//(the view must contains a NestedSrollView or RecyclerView.)
			return null;
		}
		......
	}