ActionBar的使用

public class ActionBarMechanicsActivity extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
		setContentView(R.layout.main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		
		menu.add("Normal item1");
		menu.add("Normal item2");

		MenuItem actionItem1 = menu.add("Action Button1");
		MenuItem actionItem2 = menu.add("Action Button2");
		MenuItem actionItem3 = menu.add("Action Button3");

		actionItem1.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		actionItem2.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		actionItem3.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		
		actionItem1.setIcon(android.R.drawable.alert_dark_frame);
		actionItem2.setIcon(android.R.drawable.alert_dark_frame);
		actionItem3.setIcon(android.R.drawable.ic_menu_share);

		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		Toast.makeText(this, "Selected Item: " + item.getTitle(),
				Toast.LENGTH_SHORT).show();
		return true;
	}
}

    这是3.0的一个功能模块,就是代替以前的应用中的title,在bar的左上方显示应用图标,右上方显示代替传统的menu的多个菜单按钮.