The action bar is automatically added to your app if it is using one of the Holo themes. Theme Holo is the default for all apps in Android 3.0.

Action bar API is not available on android versions before 3.0.

It is recommended that the android:showAsAction attributes to ifRoom, which will display the menu item as an action item only if there is enough room on the display. On a small size screen, the actions will  collapse into the overflow menu.

The given code will collapse the action view into just an action item. Otherwise, the search widget would consume space on the action bar even when it is not in use.

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List navigation mode is a good choice when the number of possible navigation options are too large to make tabs practical.

ActionProvider is a new class available in Android 4.0. The action bar is a way to quickly add functionality to your application, while maintaining a native platform look and feel. Hence, both statements are correct.

TabListener is used to implement the methods onTabSelected, onTabUnselected and onTabReselected.

If you need to add tabs to a sub-view of your app, you can create a tab-style interface by using a TabWidget.

To enable a split action bar on an activity, the code is:

android:name=”.SampleActivity” android:uiOptions=”splitActionBarWhenNarrow”> 

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The getCount() returns the total number of fragments in the pages and the getItem() returns the fragment at the specified position.This method will be called as the user scrolls through the pages.

The code to add the tabs and their listeners to the action bar is as follows:

            t1.setText("Tab Text");
            t1.setTabListener(this);
            bar.addTab(bar.newTab());

The correct sequence to create a tab-style interface is:

To create a tabbed interface, you have to set the navigation mode for the action bar in the onCreate method of your activity. The code is:

Public void onCreate(Bundle bun1) {
 Super.onCreate(bun1);
 final ActionBar bar = getActionBar();
 bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
}